sbase/nice.c

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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <limits.h>
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#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
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#include "util.h"
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static void
usage(void)
{
eprintf("usage: nice [-n inc] command [options ...]\n");
}
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int
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main(int argc, char *argv[])
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{
long val = 10;
int savederrno;
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ARGBEGIN {
case 'n':
val = estrtol(EARGF(usage()), 10);
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break;
default:
usage();
break;
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} ARGEND;
if (argc == 0)
usage();
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errno = 0;
val += getpriority(PRIO_PROCESS, 0);
if (errno != 0)
weprintf("getpriority:");
val = MAX(PRIO_MIN, MIN(val, PRIO_MAX));
if (setpriority(PRIO_PROCESS, 0, val) != 0)
weprintf("setpriority:");
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/* 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;
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}