blob: 2dbab60b460456d89d3d1883374c9d364880f46d [file] [log] [blame]
Bernhard Reutner-Fischere039e682009-10-26 23:29:03 +01001/* vi: set sw=4 ts=4: */
2/*
3 * wall - write a message to all logged-in users
4 * Copyright (c) 2009 Bernhard Reutner-Fischer
5 *
6 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7 */
8
9#include "libbb.h"
10#include <utmp.h>
11
12int wall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13int wall_main(int argc UNUSED_PARAM, char **argv)
14{
15 struct utmp *ut;
16 char *msg;
17 int fd = argv[1] ? xopen(argv[1], O_RDONLY) : STDIN_FILENO;
18
19 msg = xmalloc_read(fd, NULL);
20 if (ENABLE_FEATURE_CLEAN_UP && argv[1])
21 close(fd);
22 setutent();
23 while ((ut = getutent()) != NULL) {
24 char *line;
25 if (ut->ut_type != USER_PROCESS)
26 continue;
27 line = concat_path_file("/dev", ut->ut_line);
28 xopen_xwrite_close(line, msg);
29 free(line);
30 }
31 if (ENABLE_FEATURE_CLEAN_UP) {
32 endutent();
33 free(msg);
34 }
35 return EXIT_SUCCESS;
36}