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         char *argv[3];
  43
  44         dbg("running %s", name);
  45
  46         pid = fork();
  47         switch (pid) {
  48         case 0:
  49                 /* child */
  50                 udevdb_exit();  /* close udevdb */
  51                 fd = open("/dev/null", O_RDWR);
  52                 if ( fd >= 0) {
  53                         dup2(fd, STDOUT_FILENO);
  54                         dup2(fd, STDIN_FILENO);
  55                         dup2(fd, STDERR_FILENO);
  56                 }
  57                 close(fd);
  58
  59                 argv[0] = name;
  60                 argv[1] = main_argv[1];
  61                 argv[2] = NULL;
  62
  63                 execv(name, argv);
  64                 dbg("exec of child failed");
  65                 exit(1);
  66         case -1:
  67                 dbg("fork of child failed");
  68                 break;
  69                 return -1;
  70         default:
  71                 wait(NULL);
  72         }
  73
  74         return 0;
  75 }
  76
  77 /*
  78  * runs files in these directories in order:
  79  *      <node name given by udev>/
  80  *      subsystem/
  81  *      default/
  82  */
  83 void dev_d_send(struct udevice *dev, const char *subsystem, const char *devpath)
  84 {
  85         char dirname[256];
  86         char env_devname[NAME_SIZE];
  87         char *devname;
  88         char *temp;
  89
  90         if (udev_dev_d == 0)
  91                 return;
  92
  93         memset(env_devname, 0x00, sizeof(env_devname));
  94         if (dev->type == 'b' || dev->type == 'c') {
  95                 strfieldcpy(env_devname, udev_root);
  96                 strfieldcat(env_devname, dev->name);
  97         } else if (dev->type == 'n') {
  98                 strfieldcpy(env_devname, dev->name);
  99                 setenv("DEVPATH", devpath, 1);
 100         }
 101         setenv("DEVNAME", env_devname, 1);
 102         dbg("DEVNAME='%s'", env_devname);
 103
 104         devname = strdup(dev->name);
 105         if (!devname) {
 106                 dbg("out of memory");
 107                 return;
 108         }
 109
 110         /* Chop the device name up into pieces based on '/' */
 111         temp = strchr(devname, '/');
 112         while (temp != NULL) {
 113                 *temp = 0x00;
 114                 strcpy(dirname, DEVD_DIR);
 115                 strfieldcat(dirname, devname);
 116                 call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 117
 118                 *temp = '/';
 119                 ++temp;
 120                 temp = strchr(temp, '/');
 121         }
 122
 123         strcpy(dirname, DEVD_DIR);
 124         strfieldcat(dirname, dev->name);
 125         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 126
 127         strcpy(dirname, DEVD_DIR);
 128         strfieldcat(dirname, subsystem);
 129         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 130
 131         strcpy(dirname, DEVD_DIR "default");
 132         call_foreach_file(run_program, dirname, DEVD_SUFFIX);
 133 }