dev_d.c

   1 /*
   2  * dev.d multipleer
   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  * Based on the klibc version of hotplug written by:
  11  *      Author(s) Christian Borntraeger <cborntra@de.ibm.com>
  12  * which was based on the shell script written by:
  13  *      Greg Kroah-Hartman <greg@kroah.com>
  14  *
  15  */
  16
  17 /*
  18  * This essentially emulates the following shell script logic in C:
  19         DIR="/etc/dev.d"
  20         export DEVNODE="whatever_dev_name_udev_just_gave"
  21         for I in "${DIR}/$DEVNODE/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
  22                 if [ -f $I ]; then $I $1 ; fi
  23         done
  24         exit 1;
  25  */
  26
  27 #include <dirent.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <unistd.h>
  34 #include "udev.h"
  35 #include "udev_lib.h"
  36 #include "logging.h"
  37
  38 #define HOTPLUGDIR      "/etc/dev.d"
  39 #define COMMENT_PREFIX  '#'
  40
  41 static void run_program(char *name)
  42 {
  43         pid_t pid;
  44
  45         dbg("running %s", name);
  46
  47         pid = fork();
  48
  49         if (pid < 0) {
  50                 perror("fork");
  51                 return;
  52         }
  53
  54         if (pid > 0) {
  55                 wait(NULL);
  56                 return;
  57         }
  58
  59         execv(name, main_argv);
  60         exit(1);
  61 }
  62
  63 static void execute_dir (char *dirname)
  64 {
  65         DIR *directory;
  66         struct dirent *entry;
  67         char filename[256];
  68
  69         dbg("opening %s", dirname);
  70         directory = opendir(dirname);
  71         if (!directory)
  72                 return;
  73
  74         while ((entry = readdir(directory))) {
  75                 if (entry->d_name[0] == '\0')
  76                         break;
  77                 /* Don't run the files '.', '..', or hidden files,
  78                  * or files that start with a '#' */
  79                 if ((entry->d_name[0] == '.') ||
  80                     (entry->d_name[0] == COMMENT_PREFIX))
  81                         continue;
  82
  83                 /* FIXME - need to use file_list_insert() here to run these in sorted order... */
  84                 snprintf(filename, sizeof(filename), "%s%s", dirname, entry->d_name);
  85                 filename[sizeof(filename)-1] = '\0';
  86                 run_program(filename);
  87         }
  88
  89         closedir(directory);
  90 }
  91
  92 /* runs files in these directories in order:
  93  *      name given by udev
  94  *      subsystem
  95  *      default
  96  */
  97 void dev_d_send(struct udevice *dev, char *subsystem)
  98 {
  99         char dirname[256];
 100         char devnode[NAME_SIZE];
 101
 102         strfieldcpy(devnode, udev_root);
 103         strfieldcat(devnode, dev->name);
 104         setenv("DEVNODE", devnode, 1);
 105
 106         snprintf(dirname, sizeof(dirname), HOTPLUGDIR "/%s/", dev->name);
 107         dirname[sizeof(dirname)-1] = '\0';
 108         execute_dir(dirname);
 109
 110         snprintf(dirname, sizeof(dirname), HOTPLUGDIR "/%s/", subsystem);
 111         dirname[sizeof(dirname)-1] = '\0';
 112         execute_dir(dirname);
 113
 114         strcpy(dirname, HOTPLUGDIR "/default/");
 115         execute_dir(dirname);
 116 }
 117