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 <sys/stat.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "udev.h"
  31 #include "udev_lib.h"
  32 #include "udevdb.h"
  33 #include "logging.h"
  34
  35 #define DEVD_DIR                        "/etc/dev.d/"
  36 #define DEVD_SUFFIX                     ".dev"
  37
  38 static int run_program(char *name)
  39 {
  40         pid_t pid;
  41         int fd;
  42
  43         dbg("running %s", name);
  44
  45         pid = fork();
  46         switch (pid) {
  47         case 0:
  48                 /* child */
  49                 udevdb_exit();  /* close udevdb */
  50                 fd = open("/dev/null", O_RDWR);
  51                 if ( fd >= 0) {
  52                         dup2(fd, STDOUT_FILENO);
  53                         dup2(fd, STDIN_FILENO);
  54                         dup2(fd, STDERR_FILENO);
  55                 }
  56                 close(fd);
  57                 execv(name, main_argv);
  58                 dbg("exec of child failed");
  59                 exit(1);
  60         case -1:
  61                 dbg("fork of child failed");
  62                 break;
  63                 return -1;
  64         default:
  65                 wait(NULL);
  66         }
  67
  68         return 0;
  69 }
  70
  71 /*
  72  * runs files in these directories in order:
  73  *      <node name given by udev>/
  74  *      subsystem/
  75  *      default/
  76  */
  77 void dev_d_send(struct udevice *dev, const char *subsystem, const char *devpath)
  78 {
  79         char dirname[256];
  80         char env_devname[NAME_SIZE];
  81         char *devname;
  82         char *temp;
  83
  84         if (udev_dev_d == 0)
  85                 return;
  86
  87         memset(env_devname, 0x00, sizeof(env_devname));
  88         if (dev->type == 'b' || dev->type == 'c') {
  89                 strfieldcpy(env_devname, udev_root);
  90                 strfieldcat(env_devname, dev->name);
  91         } else if (dev->type == 'n') {
  92                 strfieldcpy(env_devname, dev->name);
  93                 setenv("DEVPATH", devpath, 1);
  94         }
  95         setenv("DEVNAME", env_devname, 1);
  96         dbg("DEVNAME='%s'", env_devname);
  97
  98         devname = strdup(dev->name);
  99         if (!devname) {
 100                 dbg("out of memory");
 101                 return;
 102         }
 103
 104         /* Chop the device name up into pieces based on '/' */
 105         temp = strchr(devname, '/');
 106         while (temp != NULL) {
 107                 *temp = 0x00;
 108                 strcpy(dirname, DEVD_DIR);
 109                 strfieldcat(dirname, devname);
 110                 call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 111
 112                 *temp = '/';
 113                 ++temp;
 114                 temp = strchr(temp, '/');
 115         }
 116
 117         strcpy(dirname, DEVD_DIR);
 118         strfieldcat(dirname, dev->name);
 119         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 120
 121         strcpy(dirname, DEVD_DIR);
 122         strfieldcat(dirname, subsystem);
 123         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 124
 125         strcpy(dirname, DEVD_DIR "default");
 126         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 127 }