mirror of
https://github.com/systemd/systemd-stable.git
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143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/*
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* udev.c
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*
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* Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <syslog.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "udev_utils.h"
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#include "udev_sysfs.h"
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#include "udev_version.h"
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#include "udev_rules.h"
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#include "logging.h"
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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static void asmlinkage sig_handler(int signum)
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{
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switch (signum) {
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case SIGALRM:
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exit(1);
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case SIGINT:
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case SIGTERM:
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exit(20 + signum);
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}
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}
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int main(int argc, char *argv[], char *envp[])
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{
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struct udevice udev;
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struct udev_rules rules;
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const char *action;
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const char *devpath;
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const char *subsystem;
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struct sigaction act;
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int retval = -EINVAL;
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if (argc == 2 && strcmp(argv[1], "-V") == 0) {
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printf("%s\n", UDEV_VERSION);
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exit(0);
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}
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logging_init("udev");
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udev_init_config();
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dbg("version %s", UDEV_VERSION);
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/* set signal handlers */
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memset(&act, 0x00, sizeof(act));
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act.sa_handler = (void (*)(int)) sig_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, NULL);
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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/* trigger timeout to prevent hanging processes */
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alarm(UDEV_ALARM_TIMEOUT);
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action = getenv("ACTION");
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devpath = getenv("DEVPATH");
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subsystem = getenv("SUBSYSTEM");
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/* older kernels passed the SUBSYSTEM only as argument */
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if (!subsystem && argc == 2)
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subsystem = argv[1];
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if (!action || !subsystem || !devpath) {
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err("action, subsystem or devpath missing");
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goto exit;
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}
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/* export log_priority , as called programs may want to do the same as udev */
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if (udev_log_priority) {
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char priority[32];
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sprintf(priority, "%i", udev_log_priority);
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setenv("UDEV_LOG", priority, 1);
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}
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udev_init_device(&udev, devpath, subsystem, action);
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udev_rules_init(&rules, 1, 0);
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retval = udev_process_event(&rules, &udev);
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if (!retval && udev_run && !list_empty(&udev.run_list)) {
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struct name_entry *name_loop;
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dbg("executing run list");
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list_for_each_entry(name_loop, &udev.run_list, node) {
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info("RUN key executes '%s'", name_loop->name);
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if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
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pass_env_to_socket(&name_loop->name[strlen("socket:")], devpath, action);
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else
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run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_DEBUG));
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}
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}
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udev_rules_close(&rules);
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udev_cleanup_device(&udev);
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exit:
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logging_close();
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return retval;
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}
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