166bc3052e
Some systems do not define NZERO. NZERO seems to be an XSI extension
and PRIO_{MIN,MAX} is not specified by POSIX but most relevant systems
define it.
50 lines
920 B
C
50 lines
920 B
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: nice [-n inc] command [options ...]\n");
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}
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int
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main(int argc, char *argv[])
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{
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long val = 10;
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int savederrno;
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ARGBEGIN {
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case 'n':
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val = estrtol(EARGF(usage()), 10);
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break;
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default:
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usage();
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break;
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} ARGEND;
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if (argc == 0)
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usage();
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errno = 0;
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val += getpriority(PRIO_PROCESS, 0);
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if (errno != 0)
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weprintf("getpriority:");
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val = MAX(PRIO_MIN, MIN(val, PRIO_MAX));
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if (setpriority(PRIO_PROCESS, 0, val) != 0)
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weprintf("setpriority:");
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/* POSIX specifies the nice failure still invokes the command */
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execvp(argv[0], argv);
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savederrno = errno;
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weprintf("execvp %s:", argv[0]);
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return (savederrno == ENOENT)? 127 : 126;
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}
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