Sort some miscutils/ applets into coreutils or util-linux

No code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 149 insertions, 0 deletions

diff --git a/util-linux/chrt.c b/util-linux/chrt.c
new file mode 100644
index 000000000..1604a6890
--- /dev/null
+++ b/util-linux/chrt.c
@@ -0,0 +1,149 @@
+/* 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 source tree.
+ */
+//config:config CHRT
+//config:	bool "chrt"
+//config:	default y
+//config:	help
+//config:	  manipulate real-time attributes of a process.
+//config:	  This requires sched_{g,s}etparam support in your libc.
+
+//applet:IF_CHRT(APPLET(chrt, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_CHRT) += chrt.o
+
+//usage:#define chrt_trivial_usage
+//usage:       "[-prfom] [PRIO] [PID | PROG ARGS]"
+//usage:#define chrt_full_usage "\n\n"
+//usage:       "Change scheduling priority and class for a process\n"
+//usage:     "\n	-p	Operate on PID"
+//usage:     "\n	-r	Set SCHED_RR class"
+//usage:     "\n	-f	Set SCHED_FIFO class"
+//usage:     "\n	-o	Set SCHED_OTHER class"
+//usage:     "\n	-m	Show min/max priorities"
+//usage:
+//usage:#define chrt_example_usage
+//usage:       "$ chrt -r 4 sleep 900; x=$!\n"
+//usage:       "$ chrt -f -p 3 $x\n"
+//usage:       "You need CAP_SYS_NICE privileges to set scheduling attributes of a process"
+
+#include <sched.h>
+#include "libbb.h"
+
+static const struct {
+	int policy;
+	char name[sizeof("SCHED_OTHER")];
+} policies[] = {
+	{SCHED_OTHER, "SCHED_OTHER"},
+	{SCHED_FIFO, "SCHED_FIFO"},
+	{SCHED_RR, "SCHED_RR"}
+};
+
+//TODO: add
+// -b, SCHED_BATCH
+// -i, SCHED_IDLE
+
+static void show_min_max(int pol)
+{
+	const char *fmt = "%s min/max priority\t: %u/%u\n";
+	int max, min;
+
+	max = sched_get_priority_max(pol);
+	min = sched_get_priority_min(pol);
+	if ((max|min) < 0)
+		fmt = "%s not supported\n";
+	printf(fmt, policies[pol].name, min, max);
+}
+
+#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;
+
+	/* only one policy accepted */
+	opt_complementary = "r--fo:f--ro:o--rf";
+	opt = getopt32(argv, "+mprfo");
+	if (opt & OPT_m) { /* print min/max and exit */
+		show_min_max(SCHED_FIFO);
+		show_min_max(SCHED_RR);
+		show_min_max(SCHED_OTHER);
+		fflush_stdout_and_exit(EXIT_SUCCESS);
+	}
+	if (opt & OPT_r)
+		policy = SCHED_RR;
+	if (opt & OPT_f)
+		policy = SCHED_FIFO;
+	if (opt & OPT_o)
+		policy = SCHED_OTHER;
+
+	argv += optind;
+	if (!argv[0])
+		bb_show_usage();
+	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', (int)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", (int)pid);
+		printf("pid %d's %s scheduling priority: %d\n",
+				(int)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', (int)pid);
+
+	if (!argv[0]) /* "-p <priority> <pid> [...]" */
+		goto print_rt_info;
+
+	BB_EXECVP_or_die(argv);
+}