| /* 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 source tree. |
| */ |
| |
| //usage:#define wall_trivial_usage |
| //usage: "[FILE]" |
| //usage:#define wall_full_usage "\n\n" |
| //usage: "Write content of FILE or stdin to all logged-in users" |
| //usage: |
| //usage:#define wall_sample_usage |
| //usage: "echo foo | wall\n" |
| //usage: "wall ./mymessage" |
| |
| #include "libbb.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; |
| } |