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71bc71a7d

Bernhard Reutner-Fischer

2007-03-09

FAILED Duration: 24s

Subject

- add chrt applet. text data bss dec hex filename 769 0 0 769 301 miscutils/chrt.o and could use some further shrinkage

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Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

—

Build Log

(log yok)

Commit Diff GitHub →

include/applets.h +1 -0 include/usage.h +16 -0 miscutils/Config.in +7 -0 miscutils/Kbuild +1 -0 miscutils/chrt.c +124 -0 scripts/defconfig +1 -0

include/applets.h+1 -0

@@ -74,6 +74,7 @@ USE_CHMOD(APPLET(chmod, _BB_DIR_BIN, _BB_SUID_NEVER))
	USE_CHOWN(APPLET(chown, _BB_DIR_BIN, _BB_SUID_NEVER))
	USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
	USE_CHROOT(APPLET(chroot, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
+	USE_CHRT(APPLET(chrt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
	USE_CHVT(APPLET(chvt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
	USE_CKSUM(APPLET(cksum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
	USE_CLEAR(APPLET(clear, _BB_DIR_USR_BIN, _BB_SUID_NEVER))

include/usage.h+16 -0

@@ -382,6 +382,22 @@
	#define bbsh_full_usage \
	"The bbsh shell (command interpreter)"

+	#define chrt_trivial_usage \
+	"[OPTION]... [prio] [pid \| command [arg]...]"
+	#define chrt_full_usage \
+	"manipulate real-time attributes of a process" \
+	"\n\nOptions:\n" \
+	" -p operate on pid\n" \
+	" -r set scheduling policy to SCHED_RR\n" \
+	" -f set scheduling policy to SCHED_FIFO\n" \
+	" -o set scheduling policy to SCHED_OTHER\n" \
+	" -m show min and max priorities"
+
+	#define chrt_example_usage \
+	"$ chrt -r 4 sleep 900 ; x=$!\n" \
+	"$ chrt -f -p 3 $x\n" \
+	"You need CAP_SYS_NICE privileges to set scheduling attributes of a process"
+
	#define cp_trivial_usage \
	"[OPTION]... SOURCE DEST"
	#define cp_full_usage \

miscutils/Config.in+7 -0

@@ -19,6 +19,13 @@ config BBCONFIG
	The bbconfig applet will print the config file with which
	busybox was built.

+	config CHRT
+	bool "chrt"
+	default n
+	help
+	manipulate real-time attributes of a process.
+	This requires sched_{g,s}etparam support in your libc.
+
	config CROND
	bool "crond"
	default n

miscutils/Kbuild+1 -0

@@ -7,6 +7,7 @@
	lib-y:=
	lib-$(CONFIG_ADJTIMEX) += adjtimex.o
	lib-$(CONFIG_BBCONFIG) += bbconfig.o
+	lib-$(CONFIG_CHRT) += chrt.o
	lib-$(CONFIG_CROND) += crond.o
	lib-$(CONFIG_CRONTAB) += crontab.o
	lib-$(CONFIG_DC) += dc.o

miscutils/chrt.c+124 -0

@@ -0,0 +1,124 @@
+	/* vi: set sw=4 ts=4: */
+	/*
+	* chrt - manipulate real-time attributes of a process
+	* Copyright (c) 2006-2007 Bernhard Fischer
+	*
+	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+	*/
+
+	#include "busybox.h"
+	#include <unistd.h>
+	#include <sched.h>
+	#include <getopt.h> /* optind */
+	#ifndef _POSIX_PRIORITY_SCHEDULING
+	#warning your system may be foobared
+	#endif
+	static const struct {
+	const int policy;
+	const char const 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);
+	int chrt_main(int argc, char** argv)
+	{
+	pid_t pid = 0;
+	unsigned opt;
+	struct sched_param sp;
+	char p_opt = NULL, priority = NULL;
+	const char *state = "current\0new";
+	int prio = 0, policy = SCHED_RR;
+
+	opt_complementary = "r--fo:f--ro:r--fo"; /* only one policy accepted */
+	opt = getopt32(argc, argv, "+mp:rfo", &p_opt);
+	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);
+	}
+	if (opt & OPT_p) {
+	if (argc == optind+1) { /* -p <priority> <pid> */
+	priority = p_opt;
+	p_opt = argv[optind];
+	}
+	argv += optind; /* me -p <arg> */
+	pid = xatoul_range(p_opt, 1, ULONG_MAX); /* -p <pid> */
+	} else {
+	argv += optind; /* me -p <arg> */
+	priority = *argv;
+	}
+	if (priority) {
+	/* 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
+	the static priority 0. [...] SCHED_FIFO or
+	SCHED_RR can have a static priority in the range 1 to 99.
+	*/
+	prio = xstrtol_range(priority, 0, policy == SCHED_OTHER
+	? 0 : 1, 99);
+	}
+
+	if (opt & OPT_p) {
+	int pol = 0;
+	print_rt_info:
+	pol = sched_getscheduler(pid);
+	if (pol < 0)
+	bb_perror_msg_and_die("failed to %cet pid %d's policy", 'g', pid);
+	printf("pid %d's %s scheduling policy: %s\n",
+	pid, state, policies[pol].name);
+	if (sched_getparam(pid, &sp))
+	bb_perror_msg_and_die("failed to get pid %d's attributes", pid);
+	printf("pid %d's %s scheduling priority: %d\n",
+	pid, state, sp.sched_priority);
+	if (!argv) / no new prio given or we did print already, done. */
+	return EXIT_SUCCESS;
+	}
+
+	sp.sched_priority = prio;
+	if (sched_setscheduler(pid, policy, &sp) < 0)
+	bb_perror_msg_and_die("failed to %cet pid %d's policy", 's', pid);
+	if (opt & OPT_p) {
+	state += 8;
+	++argv;
+	goto print_rt_info;
+	}
+	++argv;
+	BB_EXECVP(*argv, argv);
+	bb_perror_msg_and_die("%s", *argv);
+	}
+	#undef OPT_p
+	#undef OPT_r
+	#undef OPT_f
+	#undef OPT_o
+	#undef OPT_m

scripts/defconfig+1 -0

@@ -454,6 +454,7 @@ CONFIG_FEATURE_MOUNT_LOOP=y
	#
	CONFIG_ADJTIMEX=y
	# CONFIG_BBCONFIG is not set
+	CONFIG_CHRT=y
	CONFIG_CROND=y
	# CONFIG_DEBUG_CROND_OPTION is not set
	CONFIG_FEATURE_CROND_CALL_SENDMAIL=y