Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/ioloop-notify-dn.c @ 4903:204d7edc7cdc HEAD

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Added context parameter type safety checks for most callback APIs.
author Timo Sirainen <tss@iki.fi>
date Fri, 15 Dec 2006 18:55:29 +0200
parents 592a720e8857
children 9b8c3efa85ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 bool disabled;
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21
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22 int event_pipe[2];
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23 };
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24
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25 static int sigrt_refcount = 0;
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26
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27 static void sigrt_handler(int signo __attr_unused__, siginfo_t *si,
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28 void *data __attr_unused__)
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29 {
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30 struct ioloop_notify_handler_context *ctx =
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31 current_ioloop->notify_handler_context;
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32 int saved_errno = errno;
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33 int ret;
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34
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35 ret = write(ctx->event_pipe[1], &si->si_fd, sizeof(int));
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36 if (ret < 0 && errno != EINTR && errno != EAGAIN)
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37 i_fatal("write(event_pipe) failed: %m");
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38
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39 i_assert(ret <= 0 || ret == sizeof(int));
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40
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41 errno = saved_errno;
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42 }
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43
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44 static void event_callback(struct ioloop *ioloop)
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45 {
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46 struct ioloop_notify_handler_context *ctx =
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47 ioloop->notify_handler_context;
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48 struct io *io;
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49 int fd, ret;
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50
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51 ret = read(ctx->event_pipe[0], &fd, sizeof(fd));
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52 if (ret < 0)
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53 i_fatal("read(event_pipe) failed: %m");
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54 if (ret != sizeof(fd)) {
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55 i_fatal("read(event_pipe) returned %d != %"PRIuSIZE_T,
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56 ret, sizeof(fd));
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57 }
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58
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59 if (gettimeofday(&ioloop_timeval, &ioloop_timezone) < 0)
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60 i_fatal("gettimeofday(): %m");
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61 ioloop_time = ioloop_timeval.tv_sec;
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62
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63 for (io = ioloop->notifys; io != NULL; io = io->next) {
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64 if (io->fd == fd) {
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65 io->callback(io->context);
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66 break;
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67 }
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68 }
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69 }
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70
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71 struct io *io_loop_notify_add(struct ioloop *ioloop, const char *path,
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72 io_callback_t *callback, void *context)
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73 {
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74 struct ioloop_notify_handler_context *ctx =
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75 ioloop->notify_handler_context;
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76 struct io *io;
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77 int fd;
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78
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79 fd = open(path, O_RDONLY);
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80 if (fd == -1) {
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81 i_error("open(%s) for dnotify failed: %m", path);
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82 return NULL;
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83 }
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84
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85 if (fcntl(fd, F_SETSIG, SIGRTMIN) < 0) {
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86 if (errno == EINVAL) {
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87 /* dnotify not in kernel. disable it. */
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88 ctx->disabled = TRUE;
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89 } else {
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90 i_error("fcntl(F_SETSIG) failed: %m");
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91 }
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92 (void)close(fd);
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93 return NULL;
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94 }
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95 if (fcntl(fd, F_NOTIFY, DN_CREATE | DN_DELETE | DN_RENAME |
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96 DN_MULTISHOT) < 0) {
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97 /* we fail here if we're trying to add dnotify to
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98 non-directory fd. fail silently in that case. */
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99 if (errno != ENOTDIR)
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100 i_error("fcntl(F_NOTIFY) failed: %m");
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101 (void)fcntl(fd, F_SETSIG, 0);
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102 (void)close(fd);
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103 return NULL;
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104 }
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105
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106 if (ctx->event_io == NULL) {
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107 ctx->event_io =
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108 io_add(ctx->event_pipe[0], IO_READ,
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109 event_callback, ioloop);
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110 }
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111
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112 io = p_new(ioloop->pool, struct io, 1);
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113 io->fd = fd;
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114
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115 io->callback = callback;
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116 io->context = context;
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117 return io;
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118 }
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119
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120 void io_loop_notify_remove(struct ioloop *ioloop, struct io *io)
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121 {
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122 struct ioloop_notify_handler_context *ctx =
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123 ioloop->notify_handler_context;
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124
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125 if (fcntl(io->fd, F_NOTIFY, 0) < 0)
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126 i_error("fcntl(F_NOTIFY, 0) failed: %m");
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127 if (fcntl(io->fd, F_SETSIG, 0) < 0)
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128 i_error("fcntl(F_SETSIG, 0) failed: %m");
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129 if (close(io->fd))
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130 i_error("close(dnotify) failed: %m");
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131
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132 if (ioloop->notifys == NULL)
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133 io_remove(&ctx->event_io);
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134 }
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135
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136 void io_loop_notify_handler_init(struct ioloop *ioloop)
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137 {
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138 struct ioloop_notify_handler_context *ctx;
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139 struct sigaction act;
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140
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141 ctx = ioloop->notify_handler_context =
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142 i_new(struct ioloop_notify_handler_context, 1);
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143
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144 if (pipe(ctx->event_pipe) < 0) {
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145 i_fatal("pipe() failed: %m");
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146 return;
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147 }
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148
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149 fd_set_nonblock(ctx->event_pipe[0], TRUE);
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150 fd_set_nonblock(ctx->event_pipe[1], TRUE);
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151
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152 fd_close_on_exec(ctx->event_pipe[0], TRUE);
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153 fd_close_on_exec(ctx->event_pipe[1], TRUE);
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154
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155 if (sigrt_refcount++ == 0) {
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156 /* SIGIO is sent if queue gets full. we'll just ignore it. */
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157 signal(SIGIO, SIG_IGN);
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158
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159 act.sa_sigaction = sigrt_handler;
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160 sigemptyset(&act.sa_mask);
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161 act.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
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162
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163 if (sigaction(SIGRTMIN, &act, NULL) < 0) {
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164 if (errno == EINVAL) {
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165 /* kernel is too old to understand even RT
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166 signals, so there's no way dnotify works */
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167 ctx->disabled = TRUE;
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168 } else {
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169 i_fatal("sigaction(SIGRTMIN) failed: %m");
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170 }
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171 }
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172 }
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173 }
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174
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175 void io_loop_notify_handler_deinit(struct ioloop *ioloop __attr_unused__)
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176 {
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177 struct ioloop_notify_handler_context *ctx =
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178 ioloop->notify_handler_context;
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179
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180 if (--sigrt_refcount == 0)
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181 signal(SIGRTMIN, SIG_IGN);
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182
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183 if (close(ctx->event_pipe[0]) < 0)
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184 i_error("close(event_pipe[0]) failed: %m");
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185 if (close(ctx->event_pipe[1]) < 0)
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186 i_error("close(event_pipe[1]) failed: %m");
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187
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188 i_free(ctx);
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189 }
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190
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191 #endif