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	renice.c - sbase - suckless unix tools
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	---
	renice.c (1489B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/resource.h>
	3
	4 #include <errno.h>
	5 #include <pwd.h>
	6 #include <stdlib.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 int
	19 renice(int which, int who, long adj)
	20 {
	21 errno = 0;
	22 adj += getpriority(which, who);
	23 if (errno) {
	24 weprintf("getpriority %d:", who);
	25 return 0;
	26 }
	27
	28 adj = MAX(PRIO_MIN, MIN(adj, PRIO_MAX));
	29 if (setpriority(which, who, (int)adj) < 0) {
	30 weprintf("setpriority %d:", who);
	31 return 0;
	32 }
	33
	34 return 1;
	35 }
	36
	37 static void
	38 usage(void)
	39 {
	40 eprintf("usage: %s -n num [-g \| -p \| -u] id ...\n", argv0);
	41 }
	42
	43 int
	44 main(int argc, char *argv[])
	45 {
	46 const char *adj = NULL;
	47 long val;
	48 int which = PRIO_PROCESS, ret = 0;
	49 struct passwd *pw;
	50 int who;
	51
	52 ARGBEGIN {
	53 case 'n':
	54 adj = EARGF(usage());
	55 break;
	56 case 'g':
	57 which = PRIO_PGRP;
	58 break;
	59 case 'p':
	60 which = PRIO_PROCESS;
	61 break;
	62 case 'u':
	63 which = PRIO_USER;
	64 break;
	65 default:
	66 usage();
	67 } ARGEND
	68
	69 if (!argc \|\| !adj)
	70 usage();
	71
	72 val = estrtonum(adj, PRIO_MIN, PRIO_MAX);
	73 for (; *argv; argc--, argv++) {
	74 if (which == PRIO_USER) {
	75 errno = 0;
	76 if (!(pw = getpwnam(*argv))) {
	77 if (errno)
	78 weprintf("getpwnam %s:", *argv);
	79 else
	80 weprintf("getpwnam %s: no user f…
	81 ret = 1;
	82 continue;
	83 }
	84 who = pw->pw_uid;
	85 } else {
	86 who = estrtonum(*argv, 1, INT_MAX);
	87 }
	88 if (!renice(which, who, val))
	89 ret = 1;
	90 }
	91
	92 return ret;
	93 }