75a40e1040
Current libudev-zero source code doesn't have license information in source files. This patch add license information to source files based on SPDX standard.
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Copyright (c) 2020-2021 illiliti <illiliti@protonmail.com>
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* SPDX-License-Identifier: ISC
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*
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* this helper pretty similar to helper.sh, but it
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* doesn't write unrelated variables to file (e.g PWD or PATH)
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*
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* build:
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* cc helper.c -o helper
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*
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* usage:
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* echo /full/path/to/helper > /proc/sys/kernel/hotplug
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* echo "/full/path/to/helper UDEV_MONITOR_DIR" > /proc/sys/kernel/hotplug
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <sys/stat.h>
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int main(int argc, char **argv)
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{
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extern char **environ;
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char path[PATH_MAX];
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char *dir;
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int fd, i;
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switch (argc) {
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case 1:
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dir = "/tmp/.libudev-zero";
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break;
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case 2:
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dir = argv[1];
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break;
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default:
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fprintf(stderr, "usage: %s [dir]\n", argv[0]);
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return 2;
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}
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snprintf(path, sizeof(path), "%s/uevent.XXXXXX", dir);
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fd = mkstemp(path);
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if (fd == -1) {
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perror("mkstemp");
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return 1;
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}
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for (i = 0; environ[i]; i++) {
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if (strncmp(environ[i], "PATH=", 5) == 0 ||
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strncmp(environ[i], "HOME=", 5) == 0) {
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continue;
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}
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if (write(fd, environ[i], strlen(environ[i])) == -1 ||
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write(fd, "\n", 1) == -1) {
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perror("write");
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close(fd);
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unlink(path);
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return 1;
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}
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}
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fchmod(fd, 0444);
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close(fd);
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return 0;
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}
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