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