udev/test-udev.c

   1 /*
   2  * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <signal.h>
  29 #include <unistd.h>
  30 #include <syslog.h>
  31 #include <grp.h>
  32
  33 #include "udev.h"
  34 #include "udev_rules.h"
  35
  36 static void asmlinkage sig_handler(int signum)
  37 {
  38         switch (signum) {
  39                 case SIGALRM:
  40                         exit(1);
  41                 case SIGINT:
  42                 case SIGTERM:
  43                         exit(20 + signum);
  44         }
  45 }
  46
  47 int main(int argc, char *argv[])
  48 {
  49         struct udev *udev;
  50         struct sysfs_device *dev;
  51         struct udevice *udevice;
  52         const char *maj, *min;
  53         struct udev_rules rules;
  54         const char *action;
  55         const char *devpath;
  56         const char *subsystem;
  57         struct sigaction act;
  58         int retval = -EINVAL;
  59
  60         udev = udev_new();
  61         if (udev == NULL)
  62                 exit(1);
  63         dbg(udev, "version %s\n", VERSION);
  64
  65         /* set signal handlers */
  66         memset(&act, 0x00, sizeof(act));
  67         act.sa_handler = (void (*)(int)) sig_handler;
  68         sigemptyset (&act.sa_mask);
  69         act.sa_flags = 0;
  70         sigaction(SIGALRM, &act, NULL);
  71         sigaction(SIGINT, &act, NULL);
  72         sigaction(SIGTERM, &act, NULL);
  73
  74         /* trigger timeout to prevent hanging processes */
  75         alarm(UDEV_EVENT_TIMEOUT);
  76
  77         action = getenv("ACTION");
  78         devpath = getenv("DEVPATH");
  79         subsystem = getenv("SUBSYSTEM");
  80         /* older kernels passed the SUBSYSTEM only as argument */
  81         if (subsystem == NULL && argc == 2)
  82                 subsystem = argv[1];
  83
  84         if (action == NULL || subsystem == NULL || devpath == NULL) {
  85                 err(udev, "action, subsystem or devpath missing\n");
  86                 goto exit;
  87         }
  88
  89         /* export log_priority , as called programs may want to do the same as udev */
  90         if (udev_get_log_priority(udev) > 0) {
  91                 char priority[32];
  92
  93                 sprintf(priority, "%i", udev_get_log_priority(udev));
  94                 setenv("UDEV_LOG", priority, 1);
  95         }
  96
  97         sysfs_init();
  98         udev_rules_init(udev, &rules, 0);
  99
 100         dev = sysfs_device_get(udev, devpath);
 101         if (dev == NULL) {
 102                 info(udev, "unable to open '%s'\n", devpath);
 103                 goto fail;
 104         }
 105
 106         udevice = udev_device_init(udev);
 107         if (udevice == NULL)
 108                 goto fail;
 109
 110         /* override built-in sysfs device */
 111         udevice->dev = dev;
 112         strlcpy(udevice->action, action, sizeof(udevice->action));
 113
 114         /* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */
 115         maj = getenv("MAJOR");
 116         min = getenv("MINOR");
 117         if (maj != NULL && min != NULL)
 118                 udevice->devt = makedev(atoi(maj), atoi(min));
 119         else
 120                 udevice->devt = udev_device_get_devt(udevice);
 121
 122         retval = udev_device_event(&rules, udevice);
 123
 124         /* rules may change/disable the timeout */
 125         if (udevice->event_timeout >= 0)
 126                 alarm(udevice->event_timeout);
 127
 128         if (retval == 0 && !udevice->ignore_device && udev_get_run(udev))
 129                 udev_rules_run(udevice);
 130
 131         udev_device_cleanup(udevice);
 132 fail:
 133         udev_rules_cleanup(&rules);
 134         sysfs_cleanup();
 135 exit:
 136         udev_unref(udev);
 137         if (retval != 0)
 138                 return 1;
 139         return 0;
 140 }