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	mesg.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	mesg.c (861B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3 #include <sys/types.h>
	4
	5 #include <stdio.h>
	6 #include <stdlib.h>
	7 #include <unistd.h>
	8
	9 #include "util.h"
	10
	11 static void
	12 usage(void)
	13 {
	14 eprintf("usage: %s [n\|y]\n", argv0);
	15 }
	16
	17 int
	18 main(int argc, char *argv[])
	19 {
	20 struct stat sb;
	21 mode_t mode;
	22
	23 ARGBEGIN {
	24 default:
	25 usage();
	26 } ARGEND;
	27
	28 if (argc > 1)
	29 usage();
	30
	31 if (isatty(2) == 0)
	32 eprintf("stderr: not a tty\n");
	33
	34 if (fstat(2, &sb) < 0)
	35 eprintf("fstat stderr:");
	36
	37 if (argc == 0) {
	38 puts(sb.st_mode & (S_IWGRP \| S_IWOTH) ? "is y" : "is n");
	39 return 0;
	40 }
	41
	42 if (argv[0][0] == 'y' && argv[0][1] == '\0')
	43 mode = sb.st_mode \| S_IWGRP \| S_IWOTH;
	44 else if (argv[0][0] == 'n' && argv[0][1] == '\0')
	45 mode = sb.st_mode & ~(S_IWGRP \| S_IWOTH);
	46 else
	47 usage();
	48
	49 if (fchmod(2, mode) < 0)
	50 eprintf("fchmod stderr:");
	51
	52 return 0;
	53 }