mkinitrd-6_2_0/miscutils/chrt.c

/* vi: set sw=4 ts=4: */
/*
 * chrt - manipulate real-time attributes of a process
 * Copyright (c) 2006-2007 Bernhard Reutner-Fischer
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <sched.h>
#include "libbb.h"
#ifndef _POSIX_PRIORITY_SCHEDULING
#warning your system may be foobared
#endif
static const struct {
	int policy;
	char name[12];
} policies[] = {
	{SCHED_OTHER, "SCHED_OTHER"},
	{SCHED_FIFO, "SCHED_FIFO"},
	{SCHED_RR, "SCHED_RR"}
};

static void show_min_max(int pol)
{
	const char *fmt = "%s min/max priority\t: %d/%d\n\0%s not supported?\n";
	int max, min;
	max = sched_get_priority_max(pol);
	min = sched_get_priority_min(pol);
	if (max >= 0 && min >= 0)
		printf(fmt, policies[pol].name, min, max);
	else {
		fmt += 29;
		printf(fmt, policies[pol].name);
	}
}

#define OPT_m (1<<0)
#define OPT_p (1<<1)
#define OPT_r (1<<2)
#define OPT_f (1<<3)
#define OPT_o (1<<4)

int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int chrt_main(int argc UNUSED_PARAM, char **argv)
{
	pid_t pid = 0;
	unsigned opt;
	struct sched_param sp;
	char *pid_str;
	char *priority = priority; /* for compiler */
	const char *current_new;
	int policy = SCHED_RR;

	/* at least 1 arg; only one policy accepted */
	opt_complementary = "-1:r--fo:f--ro:r--fo";
	opt = getopt32(argv, "+mprfo");
	if (opt & OPT_r)
		policy = SCHED_RR;
	if (opt & OPT_f)
		policy = SCHED_FIFO;
	if (opt & OPT_o)
		policy = SCHED_OTHER;
	if (opt & OPT_m) { /* print min/max */
		show_min_max(SCHED_FIFO);
		show_min_max(SCHED_RR);
		show_min_max(SCHED_OTHER);
		fflush_stdout_and_exit(EXIT_SUCCESS);
	}

	argv += optind;
	if (opt & OPT_p) {
		pid_str = *argv++;
		if (*argv) { /* "-p <priority> <pid> [...]" */
			priority = pid_str;
			pid_str = *argv;
		}
		/* else "-p <pid>", and *argv == NULL */
		pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
	} else {
		priority = *argv++;
		if (!*argv)
			bb_show_usage();
	}

	current_new = "current\0new";
	if (opt & OPT_p) {
		int pol;
 print_rt_info:
		pol = sched_getscheduler(pid);
		if (pol < 0)
			bb_perror_msg_and_die("can't %cet pid %d's policy", 'g', pid);
		printf("pid %d's %s scheduling policy: %s\n",
				pid, current_new, policies[pol].name);
		if (sched_getparam(pid, &sp))
			bb_perror_msg_and_die("can't get pid %d's attributes", pid);
		printf("pid %d's %s scheduling priority: %d\n",
				pid, current_new, sp.sched_priority);
		if (!*argv) {
			/* Either it was just "-p <pid>",
			 * or it was "-p <priority> <pid>" and we came here
			 * for the second time (see goto below) */
			return EXIT_SUCCESS;
		}
		*argv = NULL;
		current_new += 8;
	}

	/* from the manpage of sched_getscheduler:
	[...] sched_priority can have a value in the range 0 to 99.
	[...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0.
	[...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
	*/
	sp.sched_priority = xstrtou_range(priority, 0, policy != SCHED_OTHER ? 1 : 0, 99);

	if (sched_setscheduler(pid, policy, &sp) < 0)
		bb_perror_msg_and_die("can't %cet pid %d's policy", 's', pid);

	if (!*argv) /* "-p <priority> <pid> [...]" */
		goto print_rt_info;

	BB_EXECVP(*argv, argv);
	bb_simple_perror_msg_and_die(*argv);
}
1	niro	816	/* vi: set sw=4 ts=4: */
2			/*
3			* chrt - manipulate real-time attributes of a process
4			* Copyright (c) 2006-2007 Bernhard Reutner-Fischer
5			*
6			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7			*/
8
9			#include <sched.h>
10			#include "libbb.h"
11			#ifndef _POSIX_PRIORITY_SCHEDULING
12			#warning your system may be foobared
13			#endif
14			static const struct {
15			int policy;
16			char name[12];
17			} policies[] = {
18			{SCHED_OTHER, "SCHED_OTHER"},
19			{SCHED_FIFO, "SCHED_FIFO"},
20			{SCHED_RR, "SCHED_RR"}
21			};
22
23			static void show_min_max(int pol)
24			{
25			const char *fmt = "%s min/max priority\t: %d/%d\n\0%s not supported?\n";
26			int max, min;
27			max = sched_get_priority_max(pol);
28			min = sched_get_priority_min(pol);
29			if (max >= 0 && min >= 0)
30			printf(fmt, policies[pol].name, min, max);
31			else {
32			fmt += 29;
33			printf(fmt, policies[pol].name);
34			}
35			}
36
37			#define OPT_m (1<<0)
38			#define OPT_p (1<<1)
39			#define OPT_r (1<<2)
40			#define OPT_f (1<<3)
41			#define OPT_o (1<<4)
42
43			int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44			int chrt_main(int argc UNUSED_PARAM, char **argv)
45			{
46			pid_t pid = 0;
47			unsigned opt;
48			struct sched_param sp;
49			char *pid_str;
50			char priority = priority; / for compiler */
51			const char *current_new;
52			int policy = SCHED_RR;
53
54			/* at least 1 arg; only one policy accepted */
55			opt_complementary = "-1:r--fo:f--ro:r--fo";
56			opt = getopt32(argv, "+mprfo");
57			if (opt & OPT_r)
58			policy = SCHED_RR;
59			if (opt & OPT_f)
60			policy = SCHED_FIFO;
61			if (opt & OPT_o)
62			policy = SCHED_OTHER;
63			if (opt & OPT_m) { /* print min/max */
64			show_min_max(SCHED_FIFO);
65			show_min_max(SCHED_RR);
66			show_min_max(SCHED_OTHER);
67			fflush_stdout_and_exit(EXIT_SUCCESS);
68			}
69
70			argv += optind;
71			if (opt & OPT_p) {
72			pid_str = *argv++;
73			if (argv) { / "-p <priority> <pid> [...]" */
74			priority = pid_str;
75			pid_str = *argv;
76			}
77			/* else "-p <pid>", and argv == NULL /
78			pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
79			} else {
80			priority = *argv++;
81			if (!*argv)
82			bb_show_usage();
83			}
84
85			current_new = "current\0new";
86			if (opt & OPT_p) {
87			int pol;
88			print_rt_info:
89			pol = sched_getscheduler(pid);
90			if (pol < 0)
91			bb_perror_msg_and_die("can't %cet pid %d's policy", 'g', pid);
92			printf("pid %d's %s scheduling policy: %s\n",
93			pid, current_new, policies[pol].name);
94			if (sched_getparam(pid, &sp))
95			bb_perror_msg_and_die("can't get pid %d's attributes", pid);
96			printf("pid %d's %s scheduling priority: %d\n",
97			pid, current_new, sp.sched_priority);
98			if (!*argv) {
99			/* Either it was just "-p <pid>",
100			* or it was "-p <priority> <pid>" and we came here
101			* for the second time (see goto below) */
102			return EXIT_SUCCESS;
103			}
104			*argv = NULL;
105			current_new += 8;
106			}
107
108			/* from the manpage of sched_getscheduler:
109			[...] sched_priority can have a value in the range 0 to 99.
110			[...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0.
111			[...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
112			*/
113			sp.sched_priority = xstrtou_range(priority, 0, policy != SCHED_OTHER ? 1 : 0, 99);
114
115			if (sched_setscheduler(pid, policy, &sp) < 0)
116			bb_perror_msg_and_die("can't %cet pid %d's policy", 's', pid);
117
118			if (!argv) / "-p <priority> <pid> [...]" */
119			goto print_rt_info;
120
121			BB_EXECVP(*argv, argv);
122			bb_simple_perror_msg_and_die(*argv);
123			}