sbase/nice.c

45 lines
770 B
C
Raw Normal View History

2013-06-09 09:20:55 -04:00
/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <limits.h>
2013-06-09 09:20:55 -04:00
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
2013-06-09 09:20:55 -04:00
#include "util.h"
static void eusage(void);
2013-06-09 09:20:55 -04:00
int
main(int argc, char **argv)
{
long val = 10;
2013-06-09 09:20:55 -04:00
ARGBEGIN {
case 'n':
val = estrtol(EARGF(eusage()), 10);
2013-06-09 09:20:55 -04:00
break;
default:
eusage();
break;
2013-06-09 09:20:55 -04:00
} ARGEND;
if(argc == 0)
eusage();
2013-06-09 09:20:55 -04:00
errno = 0;
nice((int)MAX(INT_MIN, MIN(val, INT_MAX)));
if(errno != 0)
perror("can't adjust niceness");
2013-06-09 09:20:55 -04:00
/* POSIX specifies the nice failure still invokes the command */
execvp(argv[0], argv);
/* reached only on failure */
perror(argv[0]);
return (errno == ENOENT)? 127 : 126;
2013-06-09 09:20:55 -04:00
}
static void
eusage(void)
{
eprintf("usage: nice [-n inc] command [options ...]\n");
}