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 SUFFIX          ".dev"
  40 #define COMMENT_PREFIX  '#'
  41
  42 static void run_program(char *name)
  43 {
  44         pid_t pid;
  45
  46         dbg("running %s", name);
  47
  48         pid = fork();
  49
  50         if (pid < 0) {
  51                 perror("fork");
  52                 return;
  53         }
  54
  55         if (pid > 0) {
  56                 wait(NULL);
  57                 return;
  58         }
  59
  60         execv(name, main_argv);
  61         exit(1);
  62 }
  63
  64 static void execute_dir (char *dirname)
  65 {
  66         DIR *directory;
  67         struct dirent *entry;
  68         char filename[NAME_SIZE];
  69         int name_len;
  70
  71         dbg("opening %s", dirname);
  72         directory = opendir(dirname);
  73         if (!directory)
  74                 return;
  75
  76         while ((entry = readdir(directory))) {
  77                 if (entry->d_name[0] == '\0')
  78                         break;
  79                 /* Don't run the files '.', '..', or hidden files,
  80                  * or files that start with a '#' */
  81                 if ((entry->d_name[0] == '.') ||
  82                     (entry->d_name[0] == COMMENT_PREFIX))
  83                         continue;
  84
  85                 /* Nor do we run files that do not end in ".dev" */
  86                 name_len = strlen(entry->d_name);
  87                 if (name_len < strlen(SUFFIX))
  88                         continue;
  89                 if (strcmp(&entry->d_name[name_len - sizeof (SUFFIX) + 1], SUFFIX) != 0)
  90                         continue;
  91
  92                 /* FIXME - need to use file_list_insert() here to run these in sorted order... */
  93                 snprintf(filename, sizeof(filename), "%s%s", dirname, entry->d_name);
  94                 filename[sizeof(filename)-1] = '\0';
  95                 run_program(filename);
  96         }
  97
  98         closedir(directory);
  99 }
 100
 101 /* runs files in these directories in order:
 102  *      name given by udev
 103  *      subsystem
 104  *      default
 105  */
 106 void dev_d_send(struct udevice *dev, char *subsystem)
 107 {
 108         char dirname[256];
 109         char devnode[NAME_SIZE];
 110
 111         strfieldcpy(devnode, udev_root);
 112         strfieldcat(devnode, dev->name);
 113         setenv("DEVNODE", devnode, 1);
 114
 115         snprintf(dirname, sizeof(dirname), HOTPLUGDIR "/%s/", dev->name);
 116         dirname[sizeof(dirname)-1] = '\0';
 117         execute_dir(dirname);
 118
 119         snprintf(dirname, sizeof(dirname), HOTPLUGDIR "/%s/", subsystem);
 120         dirname[sizeof(dirname)-1] = '\0';
 121         execute_dir(dirname);
 122
 123         strcpy(dirname, HOTPLUGDIR "/default/");
 124         execute_dir(dirname);
 125 }
 126