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/*
* udev_multiplex.c directory multiplexer
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
/*
* This essentially emulates the following shell script logic in C:
* DIR="/etc/dev.d"
* export DEVNAME="whatever_dev_name_udev_just_gave"
* for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
* if [ -f $I ]; then $I $1 ; fi
* done
* exit 1;
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "udev.h"
#include "udev_utils.h"
#include "logging.h"
static int run_program(struct udevice *udev, const char *filename)
{
pid_t pid;
int fd;
dbg("running %s", filename);
pid = fork();
switch (pid) {
case 0:
/* child */
fd = open("/dev/null", O_RDWR);
if ( fd >= 0) {
dup2(fd, STDOUT_FILENO);
dup2(fd, STDIN_FILENO);
dup2(fd, STDERR_FILENO);
}
close(fd);
execl(filename, filename, udev->subsystem, NULL);
dbg("exec of child failed");
_exit(1);
case -1:
dbg("fork of child failed");
break;
return -1;
default:
waitpid(pid, NULL, 0);
}
return 0;
}
/*
* runs files in these directories in order:
* <node name given by udev>/
* subsystem/
* default/
*/
void udev_multiplex_directory(struct udevice *udev, const char *basedir, const char *suffix)
{
char dirname[PATH_MAX];
/* chop the device name up into pieces based on '/' */
if (udev->name[0] != '\0') {
char devname[NAME_SIZE];
char *temp;
strfieldcpy(devname, udev->name);
temp = strchr(devname, '/');
while (temp != NULL) {
temp[0] = '\0';
/* don't call the subsystem directory here */
if (strcmp(devname, udev->subsystem) != 0) {
snprintf(dirname, PATH_MAX, "%s/%s", basedir, devname);
dirname[PATH_MAX-1] = '\0';
call_foreach_file(run_program, udev, dirname, suffix);
}
temp[0] = '/';
++temp;
temp = strchr(temp, '/');
}
}
if (udev->name[0] != '\0') {
snprintf(dirname, PATH_MAX, "%s/%s", basedir, udev->name);
dirname[PATH_MAX-1] = '\0';
call_foreach_file(run_program, udev, dirname, suffix);
}
if (udev->subsystem[0] != '\0') {
snprintf(dirname, PATH_MAX, "%s/%s", basedir, udev->subsystem);
dirname[PATH_MAX-1] = '\0';
call_foreach_file(run_program, udev, dirname, suffix);
}
snprintf(dirname, PATH_MAX, "%s/default", basedir);
dirname[PATH_MAX-1] = '\0';
call_foreach_file(run_program, udev, dirname, suffix);
}
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