sbase/nice.c

49 lines
917 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 <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
2013-06-09 09:20:55 -04:00
#include "util.h"
2014-04-22 08:13:51 -04:00
static void
usage(void)
{
eprintf("usage: nice [-n inc] command [options ...]\n");
}
2013-06-09 09:20:55 -04:00
int
2014-04-18 06:51:18 -04:00
main(int argc, char *argv[])
2013-06-09 09:20:55 -04:00
{
long val = 10;
int savederrno;
2013-06-09 09:20:55 -04:00
ARGBEGIN {
case 'n':
val = estrtol(EARGF(usage()), 10);
2013-06-09 09:20:55 -04:00
break;
default:
usage();
break;
2013-06-09 09:20:55 -04:00
} ARGEND;
if(argc == 0)
usage();
2013-06-09 09:20:55 -04:00
errno = 0;
val += getpriority(PRIO_PROCESS, 0);
if (errno != 0)
weprintf("getpriority:");
val = MAX(-NZERO, MIN(val, NZERO - 1));
if (setpriority(PRIO_PROCESS, 0, val) != 0)
weprintf("setpriority:");
2013-06-09 09:20:55 -04:00
/* POSIX specifies the nice failure still invokes the command */
execvp(argv[0], argv);
savederrno = errno;
weprintf("execvp %s:", argv[0]);
return (savederrno == ENOENT)? 127 : 126;
2013-06-09 09:20:55 -04:00
}