test-udev.c

   1 /*
   2  * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stdio.h>
  21 #include <stddef.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <unistd.h>
  29 #include <syslog.h>
  30
  31 #include "udev.h"
  32 #include "udev_rules.h"
  33 #include "udev_selinux.h"
  34
  35 #ifdef USE_LOG
  36 void log_message(int priority, const char *format, ...)
  37 {
  38         va_list args;
  39
  40         if (priority > udev_log_priority)
  41                 return;
  42
  43         va_start(args, format);
  44         vsyslog(priority, format, args);
  45         va_end(args);
  46 }
  47 #endif
  48
  49 static void asmlinkage sig_handler(int signum)
  50 {
  51         switch (signum) {
  52                 case SIGALRM:
  53                         exit(1);
  54                 case SIGINT:
  55                 case SIGTERM:
  56                         exit(20 + signum);
  57         }
  58 }
  59
  60 int main(int argc, char *argv[], char *envp[])
  61 {
  62         struct sysfs_device *dev;
  63         struct udevice *udev;
  64         const char *maj, *min;
  65         struct udev_rules rules;
  66         const char *action;
  67         const char *devpath;
  68         const char *subsystem;
  69         struct sigaction act;
  70         int devnull;
  71         int retval = -EINVAL;
  72
  73         if (argc == 2 && strcmp(argv[1], "-V") == 0) {
  74                 printf("%s\n", UDEV_VERSION);
  75                 exit(0);
  76         }
  77
  78         /* set std fd's to /dev/null, /sbin/hotplug forks us, we don't have them at all */
  79         devnull = open("/dev/null", O_RDWR);
  80         if (devnull >= 0)  {
  81                 if (devnull != STDIN_FILENO)
  82                         dup2(devnull, STDIN_FILENO);
  83                 if (devnull != STDOUT_FILENO)
  84                         dup2(devnull, STDOUT_FILENO);
  85                 if (devnull != STDERR_FILENO)
  86                         dup2(devnull, STDERR_FILENO);
  87                 if (devnull > STDERR_FILENO)
  88                         close(devnull);
  89         }
  90
  91         logging_init("udev");
  92         if (devnull < 0)
  93                 err("open /dev/null failed: %s", strerror(errno));
  94         udev_config_init();
  95         selinux_init();
  96         dbg("version %s", UDEV_VERSION);
  97
  98         /* set signal handlers */
  99         memset(&act, 0x00, sizeof(act));
 100         act.sa_handler = (void (*)(int)) sig_handler;
 101         sigemptyset (&act.sa_mask);
 102         act.sa_flags = 0;
 103         sigaction(SIGALRM, &act, NULL);
 104         sigaction(SIGINT, &act, NULL);
 105         sigaction(SIGTERM, &act, NULL);
 106
 107         /* trigger timeout to prevent hanging processes */
 108         alarm(UDEV_ALARM_TIMEOUT);
 109
 110         action = getenv("ACTION");
 111         devpath = getenv("DEVPATH");
 112         subsystem = getenv("SUBSYSTEM");
 113         /* older kernels passed the SUBSYSTEM only as argument */
 114         if (subsystem == NULL && argc == 2)
 115                 subsystem = argv[1];
 116
 117         if (action == NULL || subsystem == NULL || devpath == NULL) {
 118                 err("action, subsystem or devpath missing");
 119                 goto exit;
 120         }
 121
 122         /* export log_priority , as called programs may want to do the same as udev */
 123         if (udev_log_priority) {
 124                 char priority[32];
 125
 126                 sprintf(priority, "%i", udev_log_priority);
 127                 setenv("UDEV_LOG", priority, 1);
 128         }
 129
 130         sysfs_init();
 131         udev_rules_init(&rules, 0);
 132
 133         dev = sysfs_device_get(devpath);
 134         if (dev == NULL) {
 135                 info("unable to open '%s'", devpath);
 136                 goto fail;
 137         }
 138
 139         udev = udev_device_init(NULL);
 140         if (udev == NULL)
 141                 goto fail;
 142
 143         /* override built-in sysfs device */
 144         udev->dev = dev;
 145         strlcpy(udev->action, action, sizeof(udev->action));
 146
 147         /* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */
 148         maj = getenv("MAJOR");
 149         min = getenv("MINOR");
 150         if (maj != NULL && min != NULL)
 151                 udev->devt = makedev(atoi(maj), atoi(min));
 152         else
 153                 udev->devt = udev_device_get_devt(udev);
 154
 155         retval = udev_device_event(&rules, udev);
 156
 157         if (retval == 0 && !udev->ignore_device && udev_run)
 158                 udev_rules_run(udev);
 159
 160         udev_device_cleanup(udev);
 161 fail:
 162         udev_rules_cleanup(&rules);
 163         sysfs_cleanup();
 164         selinux_exit();
 165
 166 exit:
 167         logging_close();
 168         if (retval != 0)
 169                 return 1;
 170         return 0;
 171 }