dev_d.c

   1 /*
   2  * dev_d.c - dev.d/ 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 <unistd.h>
  27 #include "udev.h"
  28 #include "udev_lib.h"
  29 #include "logging.h"
  30
  31 #define DEVD_DIR                        "/etc/dev.d/"
  32 #define DEVD_SUFFIX                     ".dev"
  33
  34 static int run_program(char *name)
  35 {
  36         pid_t pid;
  37
  38         dbg("running %s", name);
  39
  40         pid = fork();
  41         switch (pid) {
  42         case 0:
  43                 /* child */
  44                 execv(name, main_argv);
  45                 dbg("exec of child failed");
  46                 exit(1);
  47         case -1:
  48                 dbg("fork of child failed");
  49                 break;
  50                 return -1;
  51         default:
  52                 wait(NULL);
  53         }
  54
  55         return 0;
  56 }
  57
  58 /*
  59  * runs files in these directories in order:
  60  *      <node name given by udev>/
  61  *      subsystem/
  62  *      default/
  63  */
  64 void dev_d_send(struct udevice *dev, char *subsystem, char *devpath)
  65 {
  66         char dirname[256];
  67         char env_devname[NAME_SIZE];
  68         char *devname;
  69         char *temp;
  70
  71         if (udev_dev_d == 0)
  72                 return;
  73
  74         if (dev->type == 'b' || dev->type == 'c') {
  75                 strfieldcpy(env_devname, udev_root);
  76                 strfieldcat(env_devname, dev->name);
  77         } else if (dev->type == 'n') {
  78                 strfieldcpy(env_devname, dev->name);
  79                 setenv("DEVPATH", devpath, 1);
  80         }
  81         setenv("DEVNAME", env_devname, 1);
  82         dbg("DEVNAME='%s'", env_devname);
  83
  84         devname = strdup(dev->name);
  85         if (!devname) {
  86                 dbg("out of memory");
  87                 return;
  88         }
  89
  90         /* Chop the device name up into pieces based on '/' */
  91         temp = strchr(devname, '/');
  92         while (temp != NULL) {
  93                 *temp = 0x00;
  94                 strcpy(dirname, DEVD_DIR);
  95                 strfieldcat(dirname, devname);
  96                 call_foreach_file(run_program, dirname, DEVD_SUFFIX);
  97
  98                 *temp = '/';
  99                 ++temp;
 100                 temp = strchr(temp, '/');
 101         }
 102
 103         strcpy(dirname, DEVD_DIR);
 104         strfieldcat(dirname, dev->name);
 105         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 106
 107         strcpy(dirname, DEVD_DIR);
 108         strfieldcat(dirname, subsystem);
 109         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 110
 111         strcpy(dirname, DEVD_DIR "default");
 112         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 113 }