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wall: new applet

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text	   data	    bss	    dec	    hex	filename
     81	      0	      0	     81	     51	miscutils/wall.o

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bernhard Reutner-Fischer
2009-10-26 23:29:03 +01:00
committed by Denys Vlasenko
parent a48308701a
commit e039e689e3
6 changed files with 53 additions and 0 deletions
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36
miscutils/wall.c Normal file
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/* 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;
}