Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/ioloop-notify-dn.c @ 3621:3ae2df67459c HEAD

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Added fd_set_nonblock() and changed net_set_nonblock() to use it.
author Timo Sirainen <tss@iki.fi>
date Sun, 25 Sep 2005 14:12:24 +0300
parents a9be1824403b
children 377f69be914f
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1 /* Copyright (C) 2003 Timo Sirainen */
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2
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3 /* Logic is pretty much based on dnotify by Oskar Liljeblad. */
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4
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5 #define _GNU_SOURCE
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6 #include "lib.h"
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7
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8 #ifdef IOLOOP_NOTIFY_DNOTIFY
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9
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10 #include "ioloop-internal.h"
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11 #include "fd-set-nonblock.h"
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12 #include "fd-close-on-exec.h"
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13
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14 #include <signal.h>
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15 #include <unistd.h>
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16 #include <fcntl.h>
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17
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18 struct ioloop_notify_handler_context {
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19 struct io *event_io;
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20 int disabled;
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21 };
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22
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23 static int event_pipe[2] = { -1, -1 };
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24
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25 static void sigrt_handler(int signo __attr_unused__, siginfo_t *si,
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26 void *data __attr_unused__)
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27 {
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28 int ret;
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29
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30 ret = write(event_pipe[1], &si->si_fd, sizeof(int));
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31 if (ret < 0 && errno != EINTR && errno != EAGAIN)
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32 i_fatal("write(event_pipe) failed: %m");
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33
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34 i_assert(ret <= 0 || ret == sizeof(int));
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35 }
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36
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37 static void event_callback(void *context)
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38 {
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39 struct ioloop *ioloop = context;
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40 struct io *io;
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41 int fd, ret;
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42
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43 ret = read(event_pipe[0], &fd, sizeof(fd));
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44 if (ret < 0)
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45 i_fatal("read(event_pipe) failed: %m");
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46 if (ret != sizeof(fd))
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47 i_fatal("read(event_pipe) returned %d != %d", ret, sizeof(fd));
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48
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49 if (gettimeofday(&ioloop_timeval, &ioloop_timezone) < 0)
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50 i_fatal("gettimeofday(): %m");
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51 ioloop_time = ioloop_timeval.tv_sec;
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52
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53 for (io = ioloop->notifys; io != NULL; io = io->next) {
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54 if (io->fd == fd) {
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55 io->callback(io->context);
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56 break;
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57 }
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58 }
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59 }
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60
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61 struct io *io_loop_notify_add(struct ioloop *ioloop, const char *path,
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62 io_callback_t *callback, void *context)
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63 {
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64 struct ioloop_notify_handler_context *ctx =
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65 ioloop->notify_handler_context;
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66 struct io *io;
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67 int fd;
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68
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69 fd = open(path, O_RDONLY);
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70 if (fd == -1) {
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71 i_error("open(%s) for dnotify failed: %m", path);
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72 return NULL;
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73 }
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74
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75 if (fcntl(fd, F_SETSIG, SIGRTMIN) < 0) {
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76 if (errno == EINVAL) {
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77 /* dnotify not in kernel. disable it. */
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78 ctx->disabled = TRUE;
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79 return NULL;
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80 }
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81 i_error("fcntl(F_SETSIG) failed: %m");
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82 return NULL;
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83 }
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84 if (fcntl(fd, F_NOTIFY, DN_CREATE | DN_DELETE | DN_RENAME |
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85 DN_MULTISHOT) < 0) {
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86 /* we fail here if we're trying to add dnotify to
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87 non-directory fd. fail silently in that case. */
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88 if (errno != ENOTDIR)
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89 i_error("fcntl(F_NOTIFY) failed: %m");
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90 (void)fcntl(fd, F_SETSIG, 0);
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91 (void)close(fd);
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92 return NULL;
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93 }
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94
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95 if (ctx->event_io == NULL) {
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96 ctx->event_io =
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97 io_add(event_pipe[0], IO_READ, event_callback, ioloop);
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98 }
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99
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100 io = p_new(ioloop->pool, struct io, 1);
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101 io->fd = fd;
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102
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103 io->callback = callback;
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104 io->context = context;
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105
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106 io->next = ioloop->notifys;
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107 ioloop->notifys = io;
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108 return io;
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109 }
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110
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111 void io_loop_notify_remove(struct ioloop *ioloop, struct io *io)
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112 {
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113 struct ioloop_notify_handler_context *ctx =
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114 ioloop->notify_handler_context;
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115 struct io **io_p;
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116
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117 if (ctx->disabled)
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118 return;
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119
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120 for (io_p = &ioloop->notifys; *io_p != NULL; io_p = &(*io_p)->next) {
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121 if (*io_p == io) {
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122 *io_p = io->next;
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123 break;
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124 }
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125 }
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126
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127 if (fcntl(io->fd, F_NOTIFY, 0) < 0)
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128 i_error("fcntl(F_NOTIFY, 0) failed: %m");
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129 if (fcntl(io->fd, F_SETSIG, 0) < 0)
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130 i_error("fcntl(F_SETSIG, 0) failed: %m");
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131 if (close(io->fd))
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132 i_error("close(dnotify) failed: %m");
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133
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134 p_free(ioloop->pool, io);
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135
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136 if (ioloop->notifys == NULL) {
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137 io_remove(ctx->event_io);
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138 ctx->event_io = NULL;
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139 }
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140 }
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141
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142 void io_loop_notify_handler_init(struct ioloop *ioloop)
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143 {
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144 struct ioloop_notify_handler_context *ctx;
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145 struct sigaction act;
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146
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147 i_assert(event_pipe[0] == -1);
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148
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149 ctx = ioloop->notify_handler_context =
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150 i_new(struct ioloop_notify_handler_context, 1);
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151
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152 if (pipe(event_pipe) < 0) {
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153 i_fatal("pipe() failed: %m");
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154 return;
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155 }
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156
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157 fd_set_nonblock(event_pipe[0], TRUE);
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158 fd_set_nonblock(event_pipe[1], TRUE);
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159
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160 fd_close_on_exec(event_pipe[0], TRUE);
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161 fd_close_on_exec(event_pipe[1], TRUE);
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162
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163 /* SIGIO is sent if queue gets full. we'll just ignore it. */
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164 signal(SIGIO, SIG_IGN);
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165
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166 act.sa_sigaction = sigrt_handler;
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167 sigemptyset(&act.sa_mask);
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168 act.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
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169
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170 if (sigaction(SIGRTMIN, &act, NULL) < 0)
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171 i_fatal("sigaction(SIGRTMIN) failed: %m");
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172 }
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173
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174 void io_loop_notify_handler_deinit(struct ioloop *ioloop __attr_unused__)
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175 {
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176 struct ioloop_notify_handler_context *ctx =
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177 ioloop->notify_handler_context;
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178
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179 signal(SIGRTMIN, SIG_IGN);
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180
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181 if (close(event_pipe[0]) < 0)
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182 i_error("close(event_pipe[0]) failed: %m");
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183 if (close(event_pipe[1]) < 0)
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184 i_error("close(event_pipe[1]) failed: %m");
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185
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186 i_free(ctx);
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187 }
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188
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189 #endif