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	nice.c - sbase - suckless unix tools
	git clone git://git.suckless.org/sbase
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	---
	nice.c (898B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/resource.h>
	3
	4 #include <errno.h>
	5 #include <stdlib.h>
	6 #include <unistd.h>
	7
	8 #include "util.h"
	9
	10 #ifndef PRIO_MIN
	11 #define PRIO_MIN -NZERO
	12 #endif
	13
	14 #ifndef PRIO_MAX
	15 #define PRIO_MAX (NZERO-1)
	16 #endif
	17
	18 static void
	19 usage(void)
	20 {
	21 eprintf("usage: %s [-n inc] cmd [arg ...]\n", argv0);
	22 }
	23
	24 int
	25 main(int argc, char *argv[])
	26 {
	27 int val = 10, r, savederrno;
	28
	29 ARGBEGIN {
	30 case 'n':
	31 val = estrtonum(EARGF(usage()), PRIO_MIN, PRIO_MAX);
	32 break;
	33 default:
	34 usage();
	35 break;
	36 } ARGEND
	37
	38 if (!argc)
	39 usage();
	40
	41 errno = 0;
	42 r = getpriority(PRIO_PROCESS, 0);
	43 if (errno)
	44 weprintf("getpriority:");
	45 else
	46 val += r;
	47 LIMIT(val, PRIO_MIN, PRIO_MAX);
	48 if (setpriority(PRIO_PROCESS, 0, val) < 0)
	49 weprintf("setpriority:");
	50
	51 execvp(argv[0], argv);
	52 savederrno = errno;
	53 weprintf("execvp %s:", argv[0]);
	54
	55 _exit(126 + (savederrno == ENOENT));
	56 }