[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/chrt.c b/ap/app/busybox/src/miscutils/chrt.c
new file mode 100644
index 0000000..91b5397
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/chrt.c
@@ -0,0 +1,142 @@
+/* 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.
+ */
+
+//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"
+#ifndef _POSIX_PRIORITY_SCHEDULING
+#warning your system may be foobared
+#endif
+
+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);
+}