[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/taskset.c b/ap/app/busybox/src/miscutils/taskset.c
new file mode 100644
index 0000000..4a9e323
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/taskset.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * taskset - retrieve or set a processes' CPU affinity
+ * Copyright (c) 2006 Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//usage:#define taskset_trivial_usage
+//usage: "[-p] [MASK] [PID | PROG ARGS]"
+//usage:#define taskset_full_usage "\n\n"
+//usage: "Set or get CPU affinity\n"
+//usage: "\n -p Operate on an existing PID"
+//usage:
+//usage:#define taskset_example_usage
+//usage: "$ taskset 0x7 ./dgemm_test&\n"
+//usage: "$ taskset -p 0x1 $!\n"
+//usage: "pid 4790's current affinity mask: 7\n"
+//usage: "pid 4790's new affinity mask: 1\n"
+//usage: "$ taskset 0x7 /bin/sh -c './taskset -p 0x1 $$'\n"
+//usage: "pid 6671's current affinity mask: 1\n"
+//usage: "pid 6671's new affinity mask: 1\n"
+//usage: "$ taskset -p 1\n"
+//usage: "pid 1's current affinity mask: 3\n"
+
+#include <sched.h>
+#include "libbb.h"
+
+#if ENABLE_FEATURE_TASKSET_FANCY
+#define TASKSET_PRINTF_MASK "%s"
+/* craft a string from the mask */
+static char *from_cpuset(cpu_set_t *mask)
+{
+ int i;
+ char *ret = NULL;
+ char *str = xzalloc((CPU_SETSIZE / 4) + 1); /* we will leak it */
+
+ for (i = CPU_SETSIZE - 4; i >= 0; i -= 4) {
+ int val = 0;
+ int off;
+ for (off = 0; off <= 3; ++off)
+ if (CPU_ISSET(i + off, mask))
+ val |= 1 << off;
+ if (!ret && val)
+ ret = str;
+ *str++ = bb_hexdigits_upcase[val] | 0x20;
+ }
+ return ret;
+}
+#else
+#define TASKSET_PRINTF_MASK "%llx"
+static unsigned long long from_cpuset(cpu_set_t *mask)
+{
+ struct BUG_CPU_SETSIZE_is_too_small {
+ char BUG_CPU_SETSIZE_is_too_small[
+ CPU_SETSIZE < sizeof(int) ? -1 : 1];
+ };
+ char *p = (void*)mask;
+
+ /* Take the least significant bits. Careful!
+ * Consider both CPU_SETSIZE=4 and CPU_SETSIZE=1024 cases
+ */
+#if BB_BIG_ENDIAN
+ /* For big endian, it means LAST bits */
+ if (CPU_SETSIZE < sizeof(long))
+ p += CPU_SETSIZE - sizeof(int);
+ else if (CPU_SETSIZE < sizeof(long long))
+ p += CPU_SETSIZE - sizeof(long);
+ else
+ p += CPU_SETSIZE - sizeof(long long);
+#endif
+ if (CPU_SETSIZE < sizeof(long))
+ return *(unsigned*)p;
+ if (CPU_SETSIZE < sizeof(long long))
+ return *(unsigned long*)p;
+ return *(unsigned long long*)p;
+}
+#endif
+
+
+int taskset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int taskset_main(int argc UNUSED_PARAM, char **argv)
+{
+ cpu_set_t mask;
+ pid_t pid = 0;
+ unsigned opt_p;
+ const char *current_new;
+ char *pid_str;
+ char *aff = aff; /* for compiler */
+
+ /* NB: we mimic util-linux's taskset: -p does not take
+ * an argument, i.e., "-pN" is NOT valid, only "-p N"!
+ * Indeed, util-linux-2.13-pre7 uses:
+ * getopt_long(argc, argv, "+pchV", ...), not "...p:..." */
+
+ opt_complementary = "-1"; /* at least 1 arg */
+ opt_p = getopt32(argv, "+p");
+ argv += optind;
+
+ if (opt_p) {
+ pid_str = *argv++;
+ if (*argv) { /* "-p <aff> <pid> ...rest.is.ignored..." */
+ aff = pid_str;
+ pid_str = *argv; /* NB: *argv != NULL in this case */
+ }
+ /* else it was just "-p <pid>", and *argv == NULL */
+ pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
+ } else {
+ aff = *argv++; /* <aff> <cmd...> */
+ if (!*argv)
+ bb_show_usage();
+ }
+
+ current_new = "current\0new";
+ if (opt_p) {
+ print_aff:
+ if (sched_getaffinity(pid, sizeof(mask), &mask) < 0)
+ bb_perror_msg_and_die("can't %cet pid %d's affinity", 'g', pid);
+ printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
+ pid, current_new, from_cpuset(&mask));
+ if (!*argv) {
+ /* Either it was just "-p <pid>",
+ * or it was "-p <aff> <pid>" and we came here
+ * for the second time (see goto below) */
+ return EXIT_SUCCESS;
+ }
+ *argv = NULL;
+ current_new += 8; /* "new" */
+ }
+
+ { /* Affinity was specified, translate it into cpu_set_t */
+ unsigned i;
+ /* Do not allow zero mask: */
+ unsigned long long m = xstrtoull_range(aff, 0, 1, ULLONG_MAX);
+ enum { CNT_BIT = CPU_SETSIZE < sizeof(m)*8 ? CPU_SETSIZE : sizeof(m)*8 };
+
+ CPU_ZERO(&mask);
+ for (i = 0; i < CNT_BIT; i++) {
+ unsigned long long bit = (1ULL << i);
+ if (bit & m)
+ CPU_SET(i, &mask);
+ }
+ }
+
+ /* Set pid's or our own (pid==0) affinity */
+ if (sched_setaffinity(pid, sizeof(mask), &mask))
+ bb_perror_msg_and_die("can't %cet pid %d's affinity", 's', pid);
+
+ if (!argv[0]) /* "-p <aff> <pid> [...ignored...]" */
+ goto print_aff; /* print new affinity and exit */
+
+ BB_EXECVP_or_die(argv);
+}