1/* 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} 37