dovecot/core-2.2: src/lib/lib-signals.c annotate

annotate src/lib/lib-signals.c @ 22664:fea53c2725c0

director: Fix director_max_parallel_moves/kicks type Should be uint, not time.

author	Timo Sirainen <timo.sirainen@dovecot.fi>
date	Thu, 09 Nov 2017 12:24:16 +0200
parents	cc3d5de90348
children	cb108f786fb4

rev	line source
21390 2e2563132d5f Updated copyright notices to include the year 2017. Stephan Bosch <stephan.bosch@dovecot.fi> parents: 21389 diff changeset	1 /* Copyright (c) 2001-2017 Dovecot authors, see the included COPYING file */
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	2
3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	3 #include "lib.h"
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	4 #include "ioloop.h"
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	5 #include "fd-close-on-exec.h"
10493 2d7e2e76a100 lib-signals: Set signal pipe fds non-blocking to make sure read/write doesn't hang. Timo Sirainen <tss@iki.fi> parents: 9905 diff changeset	6 #include "fd-set-nonblock.h"
22023 b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	7 #include "write-full.h"
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	8 #include "lib-signals.h"
3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	9
22023 b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	10 #include <stdio.h>
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	11 #include <signal.h>
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	12 #include <unistd.h>
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	13
13022 a32debbe3496 Increased highest signal number limit. HP-UX can use at least 44. Timo Sirainen <tss@iki.fi> parents: 12782 diff changeset	14 #define MAX_SIGNAL_VALUE 63
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	15
12117 7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	16 #define SIGNAL_IS_TERMINAL(signo) \
7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	17 ((signo) == SIGINT \|\| (signo) == SIGQUIT \|\| (signo) == SIGTERM)
7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	18
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	19 #if !defined(SA_SIGINFO) && !defined(SI_NOINFO)
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	20 /* without SA_SIGINFO we don't know what the real code is. we need SI_NOINFO
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	21 to make sure lib_signal_code_to_str() returns "". */
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	22 # define SI_NOINFO -1
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	23 #endif
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	24
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	25 struct signal_handler {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	26 signal_handler_t *handler;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	27 void *context;
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	28
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	29 enum libsig_flags flags;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	30 struct signal_handler *next;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	31 };
2854 e0db9324e799 Changed lib_signal_hup to lib_signal_hup_count. Timo Sirainen <tss@iki.fi> parents: 2490 diff changeset	32
12117 7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	33 volatile unsigned int signal_term_counter = 0;
7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	34
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	35 /* Remember that these are accessed inside signal handler which may be called
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	36 even while we're initializing/deinitializing. Try hard to keep everything
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	37 in consistent state. */
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	38 static struct signal_handler *signal_handlers[MAX_SIGNAL_VALUE+1] = { NULL, };
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	39 static int sig_pipe_fd[2] = { -1, -1 };
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	40
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	41 static bool signals_initialized = FALSE;
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	42 static struct io *io_sig = NULL;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	43
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	44 static siginfo_t pending_signals[MAX_SIGNAL_VALUE+1];
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	45 static bool have_pending_signals = FALSE;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	46
9031 bfbbae6cdb51 Compile fix to NetBSD: Don't use si_code which is a macro. Timo Sirainen <tss@iki.fi> parents: 8883 diff changeset	47 const char *lib_signal_code_to_str(int signo, int sicode)
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	48 {
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	49 /* common */
9031 bfbbae6cdb51 Compile fix to NetBSD: Don't use si_code which is a macro. Timo Sirainen <tss@iki.fi> parents: 8883 diff changeset	50 switch (sicode) {
9816 11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	51 #ifdef SI_NOINFO
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	52 case SI_NOINFO:
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	53 return "";
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	54 #endif
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	55 case SI_USER:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	56 return "kill";
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	57 #ifdef SI_KERNEL
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	58 case SI_KERNEL:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	59 return "kernel";
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	60 #endif
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	61 case SI_TIMER:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	62 return "timer";
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	63 }
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	64
9032 286ff5114588 FreeBSD compiling fix. Timo Sirainen <tss@iki.fi> parents: 9031 diff changeset	65 /* If SEGV_MAPERR is supported, the rest of them must be too.
286ff5114588 FreeBSD compiling fix. Timo Sirainen <tss@iki.fi> parents: 9031 diff changeset	66 FreeBSD 6 at least doesn't support these. */
286ff5114588 FreeBSD compiling fix. Timo Sirainen <tss@iki.fi> parents: 9031 diff changeset	67 #ifdef SEGV_MAPERR
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	68 switch (signo) {
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	69 case SIGSEGV:
9031 bfbbae6cdb51 Compile fix to NetBSD: Don't use si_code which is a macro. Timo Sirainen <tss@iki.fi> parents: 8883 diff changeset	70 switch (sicode) {
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	71 case SEGV_MAPERR:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	72 return "address not mapped";
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	73 case SEGV_ACCERR:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	74 return "invalid permissions";
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	75 }
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	76 break;
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	77 case SIGBUS:
9031 bfbbae6cdb51 Compile fix to NetBSD: Don't use si_code which is a macro. Timo Sirainen <tss@iki.fi> parents: 8883 diff changeset	78 switch (sicode) {
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	79 case BUS_ADRALN:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	80 return "invalid address alignment";
11445 785f1507fed8 Compile fix for OSX 10.3. Timo Sirainen <tss@iki.fi> parents: 10582 diff changeset	81 #ifdef BUS_ADRERR /* for OSX 10.3 */
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	82 case BUS_ADRERR:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	83 return "nonexistent physical address";
11445 785f1507fed8 Compile fix for OSX 10.3. Timo Sirainen <tss@iki.fi> parents: 10582 diff changeset	84 #endif
785f1507fed8 Compile fix for OSX 10.3. Timo Sirainen <tss@iki.fi> parents: 10582 diff changeset	85 #ifdef BUS_OBJERR /* for OSX 10.3 */
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	86 case BUS_OBJERR:
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	87 return "object-specific hardware error";
11445 785f1507fed8 Compile fix for OSX 10.3. Timo Sirainen <tss@iki.fi> parents: 10582 diff changeset	88 #endif
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	89 }
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	90 }
9032 286ff5114588 FreeBSD compiling fix. Timo Sirainen <tss@iki.fi> parents: 9031 diff changeset	91 #endif
9031 bfbbae6cdb51 Compile fix to NetBSD: Don't use si_code which is a macro. Timo Sirainen <tss@iki.fi> parents: 8883 diff changeset	92 return t_strdup_printf("unknown %d", sicode);
8883 5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	93 }
5361cb6afe9e When a process is killed, show the signal code and the sending process's pid and uid. Timo Sirainen <tss@iki.fi> parents: 8882 diff changeset	94
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	95 #ifdef SA_SIGINFO
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	96 static void sig_handler(int signo, siginfo_t si, void context ATTR_UNUSED)
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	97 #else
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	98 static void sig_handler(int signo)
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	99 #endif
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	100 {
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	101 struct signal_handler *h;
16436 fbeac7272069 Make sure errno is preserved in non-delayed signal handlers. Timo Sirainen <tss@iki.fi> parents: 15715 diff changeset	102 int saved_errno;
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	103 char c = 0;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	104
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	105 #if defined(SI_NOINFO) \|\| !defined(SA_SIGINFO)
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	106 #ifndef SA_SIGINFO
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	107 siginfo_t *si = NULL;
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	108 #endif
9816 11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	109 siginfo_t tmp_si;
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	110
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	111 if (si == NULL) {
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	112 /* Solaris can leave this to NULL */
21389 59437f8764c6 global: Replaced all instances of memset(p, 0, sizeof(p)) with the new i_zero() macro. Stephan Bosch <stephan.bosch@dovecot.fi>* parents: 19552 diff changeset	113 i_zero(&tmp_si);
9816 11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	114 tmp_si.si_signo = signo;
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	115 tmp_si.si_code = SI_NOINFO;
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	116 si = &tmp_si;
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	117 }
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	118 #endif
11e3058af06c Solaris: Don't crash when signal handler is called with siginfo_t=NULL. Timo Sirainen <tss@iki.fi> parents: 9648 diff changeset	119
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	120 if (signo < 0 \|\| signo > MAX_SIGNAL_VALUE)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	121 return;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	122
12117 7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	123 if (SIGNAL_IS_TERMINAL(signo))
7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	124 signal_term_counter++;
7f364dafc675 Added signal_term_counter that keeps track of how many terminal signals have been received. Timo Sirainen <tss@iki.fi> parents: 11445 diff changeset	125
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	126 /* remember that we're inside a signal handler which might have been
9905 54c0c2c24f2c lib-signals: Don't assert-crash with nested signal handler calls. Timo Sirainen <tss@iki.fi> parents: 9816 diff changeset	127 called at any time. don't do anything that's unsafe. we might also
54c0c2c24f2c lib-signals: Don't assert-crash with nested signal handler calls. Timo Sirainen <tss@iki.fi> parents: 9816 diff changeset	128 get interrupted by another signal while inside this handler. */
16436 fbeac7272069 Make sure errno is preserved in non-delayed signal handlers. Timo Sirainen <tss@iki.fi> parents: 15715 diff changeset	129 saved_errno = errno;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	130 for (h = signal_handlers[signo]; h != NULL; h = h->next) {
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	131 if ((h->flags & LIBSIG_FLAG_DELAYED) == 0)
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	132 h->handler(si, h->context);
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	133 else if (pending_signals[signo].si_signo == 0) {
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	134 pending_signals[signo] = *si;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	135 if (!have_pending_signals) {
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	136 if (write(sig_pipe_fd[1], &c, 1) != 1)
22024 cc3d5de90348 lib: Use lib_signals_syscall_error() for write() failure in signal handler Timo Sirainen <timo.sirainen@dovecot.fi> parents: 22023 diff changeset	137 lib_signals_syscall_error("signal: write(sigpipe) failed: ");
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	138 have_pending_signals = TRUE;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	139 }
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	140 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	141 }
16436 fbeac7272069 Make sure errno is preserved in non-delayed signal handlers. Timo Sirainen <tss@iki.fi> parents: 15715 diff changeset	142 errno = saved_errno;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	143 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	144
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	145 #ifdef SA_SIGINFO
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	146 static void sig_ignore(int signo ATTR_UNUSED, siginfo_t *si ATTR_UNUSED,
9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	147 void *context ATTR_UNUSED)
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	148 #else
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	149 static void sig_ignore(int signo ATTR_UNUSED)
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	150 #endif
4251 5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	151 {
4252 ec4782b057f0 And s/lib_signals_ignore_signal/lib_signals_ignore/ Timo Sirainen <tss@iki.fi> parents: 4251 diff changeset	152 /* if we used SIG_IGN instead of this function,
ec4782b057f0 And s/lib_signals_ignore_signal/lib_signals_ignore/ Timo Sirainen <tss@iki.fi> parents: 4251 diff changeset	153 the system call might be restarted */
4251 5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	154 }
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	155
14629 c93ca5e46a8a Marked functions parameters that are allowed to be NULL. Some APIs were also changed. Timo Sirainen <tss@iki.fi> parents: 14133 diff changeset	156 static void ATTR_NULL(1)
c93ca5e46a8a Marked functions parameters that are allowed to be NULL. Some APIs were also changed. Timo Sirainen <tss@iki.fi> parents: 14133 diff changeset	157 signal_read(void *context ATTR_UNUSED)
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	158 {
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	159 siginfo_t signals[MAX_SIGNAL_VALUE+1];
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	160 sigset_t fullset, oldset;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	161 struct signal_handler *h;
9905 54c0c2c24f2c lib-signals: Don't assert-crash with nested signal handler calls. Timo Sirainen <tss@iki.fi> parents: 9816 diff changeset	162 char buf[64];
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	163 int signo;
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	164 ssize_t ret;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	165
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	166 if (sigfillset(&fullset) < 0)
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	167 i_fatal("sigfillset() failed: %m");
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	168 if (sigprocmask(SIG_BLOCK, &fullset, &oldset) < 0)
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	169 i_fatal("sigprocmask() failed: %m");
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	170
9905 54c0c2c24f2c lib-signals: Don't assert-crash with nested signal handler calls. Timo Sirainen <tss@iki.fi> parents: 9816 diff changeset	171 /* typically we should read only a single byte, but if a signal
54c0c2c24f2c lib-signals: Don't assert-crash with nested signal handler calls. Timo Sirainen <tss@iki.fi> parents: 9816 diff changeset	172 is sent while signal handler is running we might get more. */
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	173 ret = read(sig_pipe_fd[0], buf, sizeof(buf));
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	174 if (ret > 0) {
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	175 memcpy(signals, pending_signals, sizeof(signals));
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	176 memset(pending_signals, 0, sizeof(pending_signals));
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	177 have_pending_signals = FALSE;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	178 } else if (ret < 0) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	179 if (errno != EAGAIN)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	180 i_fatal("read(sigpipe) failed: %m");
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	181 } else {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	182 i_fatal("read(sigpipe) failed: EOF");
2880 f2718224c9e9 Add signal counters to USR1 and USR2 signals too. Timo Sirainen <tss@iki.fi> parents: 2854 diff changeset	183 }
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	184 if (sigprocmask(SIG_SETMASK, &oldset, NULL) < 0)
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	185 i_fatal("sigprocmask() failed: %m");
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	186
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	187 if (ret < 0)
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	188 return;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	189
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	190 /* call the delayed handlers after signals are copied and unblocked */
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	191 for (signo = 0; signo < MAX_SIGNAL_VALUE; signo++) {
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	192 if (signals[signo].si_signo == 0)
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	193 continue;
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	194
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	195 for (h = signal_handlers[signo]; h != NULL; h = h->next) {
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	196 if ((h->flags & LIBSIG_FLAG_DELAYED) != 0)
9648 028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	197 h->handler(&signals[signo], h->context);
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	198 }
028878f7063a lib-signals: Redesigned how delayed signals are handled. Timo Sirainen <tss@iki.fi> parents: 9032 diff changeset	199 }
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	200 }
3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	201
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	202 static void lib_signals_set(int signo, enum libsig_flags flags)
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	203 {
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	204 struct sigaction act;
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	205
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	206 if (sigemptyset(&act.sa_mask) < 0)
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	207 i_fatal("sigemptyset(): %m");
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	208 #ifdef SA_SIGINFO
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	209 act.sa_flags = SA_SIGINFO;
13063 0c6a9b907656 lib-signals: Removed unnecessary code. Timo Sirainen <tss@iki.fi> parents: 13022 diff changeset	210 act.sa_sigaction = sig_handler;
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	211 #else
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	212 act.sa_flags = 0;
13063 0c6a9b907656 lib-signals: Removed unnecessary code. Timo Sirainen <tss@iki.fi> parents: 13022 diff changeset	213 act.sa_handler = sig_handler;
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	214 #endif
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	215 if ((flags & LIBSIG_FLAG_RESTART) != 0)
86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	216 act.sa_flags \|= SA_RESTART;
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	217 if (sigaction(signo, &act, NULL) < 0)
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	218 i_fatal("sigaction(%d): %m", signo);
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	219 }
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	220
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	221 void lib_signals_set_handler(int signo, enum libsig_flags flags,
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	222 signal_handler_t handler, void context)
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	223 {
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	224 struct signal_handler *h;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	225
4903 204d7edc7cdc Added context parameter type safety checks for most callback APIs. Timo Sirainen <tss@iki.fi> parents: 4824 diff changeset	226 i_assert(handler != NULL);
204d7edc7cdc Added context parameter type safety checks for most callback APIs. Timo Sirainen <tss@iki.fi> parents: 4824 diff changeset	227
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	228 if (signo < 0 \|\| signo > MAX_SIGNAL_VALUE) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	229 i_panic("Trying to set signal %d handler, but max is %d",
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	230 signo, MAX_SIGNAL_VALUE);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	231 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	232
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	233 if (signal_handlers[signo] == NULL && signals_initialized)
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	234 lib_signals_set(signo, flags);
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	235
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	236 if ((flags & LIBSIG_FLAG_DELAYED) != 0 && sig_pipe_fd[0] == -1) {
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	237 /* first delayed handler */
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	238 if (pipe(sig_pipe_fd) < 0)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	239 i_fatal("pipe() failed: %m");
10493 2d7e2e76a100 lib-signals: Set signal pipe fds non-blocking to make sure read/write doesn't hang. Timo Sirainen <tss@iki.fi> parents: 9905 diff changeset	240 fd_set_nonblock(sig_pipe_fd[0], TRUE);
2d7e2e76a100 lib-signals: Set signal pipe fds non-blocking to make sure read/write doesn't hang. Timo Sirainen <tss@iki.fi> parents: 9905 diff changeset	241 fd_set_nonblock(sig_pipe_fd[1], TRUE);
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	242 fd_close_on_exec(sig_pipe_fd[0], TRUE);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	243 fd_close_on_exec(sig_pipe_fd[1], TRUE);
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	244 if (signals_initialized) {
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	245 io_sig = io_add(sig_pipe_fd[0], IO_READ,
15079 925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	246 signal_read, (void *)NULL);
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	247 }
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	248 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	249
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	250 h = i_new(struct signal_handler, 1);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	251 h->handler = handler;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	252 h->context = context;
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	253 h->flags = flags;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	254
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	255 /* atomically set to signal_handlers[] list */
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	256 h->next = signal_handlers[signo];
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	257 signal_handlers[signo] = h;
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	258 }
3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	259
4903 204d7edc7cdc Added context parameter type safety checks for most callback APIs. Timo Sirainen <tss@iki.fi> parents: 4824 diff changeset	260 void lib_signals_ignore(int signo, bool restart_syscalls)
4251 5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	261 {
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	262 struct sigaction act;
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	263
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	264 if (signo < 0 \|\| signo > MAX_SIGNAL_VALUE) {
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	265 i_panic("Trying to ignore signal %d, but max is %d",
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	266 signo, MAX_SIGNAL_VALUE);
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	267 }
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	268
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	269 i_assert(signal_handlers[signo] == NULL);
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	270
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	271 if (sigemptyset(&act.sa_mask) < 0)
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	272 i_fatal("sigemptyset(): %m");
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	273 if (restart_syscalls) {
9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	274 act.sa_flags = SA_RESTART;
9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	275 act.sa_handler = SIG_IGN;
9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	276 } else {
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	277 #ifdef SA_SIGINFO
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	278 act.sa_flags = SA_SIGINFO;
9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	279 act.sa_sigaction = sig_ignore;
10504 9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	280 #else
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	281 act.sa_flags = 0;
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	282 act.sa_handler = sig_ignore;
9c2fe6d0b684 lib-signals: Compile fix for Hurd (SA_SIGINFO not available). Timo Sirainen <tss@iki.fi> parents: 10493 diff changeset	283 #endif
8882 9f3968f49ceb lib-signals: Changed callback API to return siginfo_t. Timo Sirainen <tss@iki.fi> parents: 8590 diff changeset	284 }
4251 5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	285
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	286 if (sigaction(signo, &act, NULL) < 0)
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	287 i_fatal("sigaction(%d): %m", signo);
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	288 }
5bc987dc62a8 Added lib_signals_ignore_signal() and made lib_signals_set_handler() with Timo Sirainen <tss@iki.fi> parents: 3879 diff changeset	289
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	290 void lib_signals_unset_handler(int signo, signal_handler_t *handler,
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	291 void *context)
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	292 {
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	293 struct signal_handler h, *p;
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	294
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	295 for (p = &signal_handlers[signo]; p != NULL; p = &(p)->next) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	296 if ((p)->handler == handler && (p)->context == context) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	297 h = *p;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	298 *p = h->next;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	299 i_free(h);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	300 return;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	301 }
2880 f2718224c9e9 Add signal counters to USR1 and USR2 signals too. Timo Sirainen <tss@iki.fi> parents: 2854 diff changeset	302 }
3419 b97914e7c941 Ignore SIGALRM, but not with SIG_IGN as it causes syscalls to restart. Timo Sirainen <tss@iki.fi> parents: 2880 diff changeset	303
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	304 i_panic("lib_signals_unset_handler(%d, %p, %p): handler not found",
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	305 signo, (void *)handler, context);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	306 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	307
8367 0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	308 void lib_signals_reset_ioloop(void)
0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	309 {
0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	310 if (io_sig != NULL) {
0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	311 io_remove(&io_sig);
15079 925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	312 io_sig = io_add(sig_pipe_fd[0], IO_READ,
925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	313 signal_read, (void *)NULL);
8367 0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	314 }
0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	315 }
0d49326397b4 Added lib_signals_reset_ioloop() for handling signals with multiple ioloops. Timo Sirainen <tss@iki.fi> parents: 7086 diff changeset	316
22023 b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	317 void lib_signals_syscall_error(const char *prefix)
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	318 {
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	319 /* @UNSAFE: We're in a signal handler. It's very limited what is
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	320 allowed in here. Especially strerror() isn't at least officially
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	321 allowed. */
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	322 char errno_buf[MAX_INT_STRLEN], *errno_str;
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	323 errno_str = dec2str_buf(errno_buf, errno);
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	324
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	325 size_t prefix_len = strlen(prefix);
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	326 size_t errno_str_len = strlen(errno_str);
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	327 char buf[prefix_len + errno_str_len + 1];
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	328
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	329 memcpy(buf, prefix, prefix_len);
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	330 memcpy(buf + prefix_len, errno_str, errno_str_len);
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	331 buf[prefix_len + errno_str_len] = '\n';
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	332 if (write_full(STDERR_FILENO, buf, prefix_len + errno_str_len + 1) < 0) {
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	333 /* can't really do anything */
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	334 }
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	335 }
b3897f959cb4 lib: Add lib_signals_syscall_error() Timo Sirainen <timo.sirainen@dovecot.fi> parents: 21390 diff changeset	336
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	337 void lib_signals_init(void)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	338 {
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	339 int i;
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	340
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	341 signals_initialized = TRUE;
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	342
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	343 /* add signals that were already registered */
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	344 for (i = 0; i < MAX_SIGNAL_VALUE; i++) {
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	345 if (signal_handlers[i] != NULL)
13064 86e4023d08e4 lib_signals_set_handler(): Changed API to take flags instead of boolean. Timo Sirainen <tss@iki.fi> parents: 13063 diff changeset	346 lib_signals_set(i, signal_handlers[i]->flags);
5815 3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	347 }
3f1d268f32f0 Allow registering signal handlers even before lib_signals_init() is called. Timo Sirainen <tss@iki.fi> parents: 5089 diff changeset	348
15079 925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	349 if (sig_pipe_fd[0] != -1) {
925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	350 io_sig = io_add(sig_pipe_fd[0], IO_READ,
925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	351 signal_read, (void *)NULL);
925d4a890a9b Fixed compiling with OSes where NULL isn't defined as void pointer (e.g. Solaris). Timo Sirainen <tss@iki.fi> parents: 14629 diff changeset	352 }
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	353 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	354
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	355 void lib_signals_deinit(void)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	356 {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	357 struct signal_handler handlers, h;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	358 int i;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	359
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	360 for (i = 0; i < MAX_SIGNAL_VALUE; i++) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	361 if (signal_handlers[i] != NULL) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	362 /* atomically remove from signal_handlers[] list */
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	363 handlers = signal_handlers[i];
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	364 signal_handlers[i] = NULL;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	365
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	366 while (handlers != NULL) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	367 h = handlers;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	368 handlers = h->next;
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	369 i_free(h);
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	370 }
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	371 }
3419 b97914e7c941 Ignore SIGALRM, but not with SIG_IGN as it causes syscalls to restart. Timo Sirainen <tss@iki.fi> parents: 2880 diff changeset	372 }
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	373
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	374 if (io_sig != NULL)
3879 928229f8b3e6 deinit, unref, destroy, close, free, etc. functions now take a pointer to Timo Sirainen <tss@iki.fi> parents: 3863 diff changeset	375 io_remove(&io_sig);
3620 3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	376 if (sig_pipe_fd[0] != -1) {
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	377 if (close(sig_pipe_fd[0]) < 0)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	378 i_error("close(sigpipe) failed: %m");
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	379 if (close(sig_pipe_fd[1]) < 0)
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	380 i_error("close(sigpipe) failed: %m");
3360cc019737 Implemented new signal handling framework, which makes handling signals much Timo Sirainen <tss@iki.fi> parents: 3419 diff changeset	381 }
0 3b1985cbc908 Initial revision Timo Sirainen <tss@iki.fi> parents: diff changeset	382 }

Mercurial > dovecot > core-2.2

annotate src/lib/lib-signals.c @ 22664:fea53c2725c0