sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
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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 }