udev_multiplex.c

   1 /*
   2  * udev_multiplex.c directory multiplexer
   3  *
   4  * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  */
  10
  11 /*
  12  * This essentially emulates the following shell script logic in C:
  13  *      DIR="/etc/dev.d"
  14  *      export DEVNAME="whatever_dev_name_udev_just_gave"
  15  *      for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
  16  *              if [ -f $I ]; then $I $1 ; fi
  17  *      done
  18  *      exit 1;
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "udev.h"
  31 #include "udev_libc_wrapper.h"
  32 #include "udev_utils.h"
  33 #include "logging.h"
  34
  35
  36 /*
  37  * runs files in these directories in order:
  38  *      <node name given by udev>/
  39  *      subsystem/
  40  *      default/
  41  */
  42 void udev_multiplex_directory(struct udevice *udev, const char *basedir, const char *suffix)
  43 {
  44         char dirname[PATH_SIZE];
  45         struct name_entry *name_loop, *name_tmp;
  46         LIST_HEAD(name_list);
  47
  48         /* chop the device name up into pieces based on '/' */
  49         if (udev->name[0] != '\0') {
  50                 char devname[PATH_SIZE];
  51                 char *temp;
  52
  53                 strlcpy(devname, udev->name, sizeof(devname));
  54                 temp = strchr(devname, '/');
  55                 while (temp != NULL) {
  56                         temp[0] = '\0';
  57
  58                         /* don't call the subsystem directory here */
  59                         if (strcmp(devname, udev->subsystem) != 0) {
  60                                 snprintf(dirname, sizeof(dirname), "%s/%s", basedir, devname);
  61                                 dirname[sizeof(dirname)-1] = '\0';
  62                                 add_matching_files(&name_list, dirname, suffix);
  63                         }
  64
  65                         temp[0] = '/';
  66                         ++temp;
  67                         temp = strchr(temp, '/');
  68                 }
  69         }
  70
  71         if (udev->name[0] != '\0') {
  72                 snprintf(dirname, sizeof(dirname), "%s/%s", basedir, udev->name);
  73                 dirname[sizeof(dirname)-1] = '\0';
  74                 add_matching_files(&name_list, dirname, suffix);
  75         }
  76
  77         if (udev->subsystem[0] != '\0') {
  78                 snprintf(dirname, sizeof(dirname), "%s/%s", basedir, udev->subsystem);
  79                 dirname[sizeof(dirname)-1] = '\0';
  80                 add_matching_files(&name_list, dirname, suffix);
  81         }
  82
  83         snprintf(dirname, sizeof(dirname), "%s/default", basedir);
  84         dirname[sizeof(dirname)-1] = '\0';
  85         add_matching_files(&name_list, dirname, suffix);
  86
  87         list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
  88                 execute_command(name_loop->name, udev->subsystem);
  89                 list_del(&name_loop->node);
  90         }
  91
  92 }