From 783d57af7bb2b851c16cf87df848e0365e5052da Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 12 Apr 2017 13:58:40 +0200 Subject: Sort some miscutils/ applets into coreutils or util-linux No code changes Signed-off-by: Denys Vlasenko --- util-linux/wall.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 util-linux/wall.c (limited to 'util-linux/wall.c') diff --git a/util-linux/wall.c b/util-linux/wall.c new file mode 100644 index 0000000..50658f4 --- /dev/null +++ b/util-linux/wall.c @@ -0,0 +1,63 @@ +/* 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. + */ + +//config:config WALL +//config: bool "wall" +//config: default y +//config: depends on FEATURE_UTMP +//config: help +//config: Write a message to all users that are logged in. + +/* Needs to be run by root or be suid root - needs to write to /dev/TTY: */ +//applet:IF_WALL(APPLET(wall, BB_DIR_USR_BIN, BB_SUID_REQUIRE)) + +//kbuild:lib-$(CONFIG_WALL) += wall.o + +//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 utmpx *ut; + char *msg; + int fd; + + fd = STDIN_FILENO; + if (argv[1]) { + /* The applet is setuid. + * Access to the file must be under user's uid/gid. + */ + fd = xopen_as_uid_gid(argv[1], O_RDONLY, getuid(), getgid()); + } + msg = xmalloc_read(fd, NULL); + if (ENABLE_FEATURE_CLEAN_UP && argv[1]) + close(fd); + setutxent(); + while ((ut = getutxent()) != 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) { + endutxent(); + free(msg); + } + return EXIT_SUCCESS; +} -- cgit v1.1