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