/* vi: set sw=4 ts=4: */ /* * wall - write a message to all logged-in users * Copyright (c) 2009 Bernhard Reutner-Fischer * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include "libbb.h" #include <utmp.h> int wall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int wall_main(int argc UNUSED_PARAM, char **argv) { struct utmp *ut; char *msg; int fd = argv[1] ? xopen(argv[1], O_RDONLY) : STDIN_FILENO; msg = xmalloc_read(fd, NULL); if (ENABLE_FEATURE_CLEAN_UP && argv[1]) close(fd); setutent(); while ((ut = getutent()) != NULL) { char *line; if (ut->ut_type != USER_PROCESS) continue; line = concat_path_file("/dev", ut->ut_line); xopen_xwrite_close(line, msg); free(line); } if (ENABLE_FEATURE_CLEAN_UP) { endutent(); free(msg); } return EXIT_SUCCESS; }