sbase/nice.c

48 lines
875 B
C

/* See LICENSE file for copyright and license details. */
#include <sys/resource.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-n inc] cmd [arg ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
long val = 10;
int savederrno;
ARGBEGIN {
case 'n':
val = estrtonum(EARGF(usage()), PRIO_MIN, PRIO_MAX);
break;
default:
usage();
break;
} ARGEND;
if (argc == 0)
usage();
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:");
/* 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;
}