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authorGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-06-07 15:44:59 +0000
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-06-07 15:44:59 +0000
commit16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73 (patch)
tree3945b0f4e0293206ac4969a79b73112b9ce29e85 /miscutils/taskset.c
parentea93f8a397772e515fb54f6051836218112abf3f (diff)
downloadbusybox-16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73.tar.gz
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- add applet taskset to set/retrieve the CPU affinity of a process
text data bss dec hex filename 584 0 0 584 248 taskset.o.gcc-2.95 509 0 0 509 1fd taskset.o.gcc-3.3 505 0 0 505 1f9 taskset.o.gcc-3.4 506 0 0 506 1fa taskset.o.gcc-4.0 498 0 0 498 1f2 taskset.o.gcc-4.1 495 0 0 495 1ef taskset.o.gcc-4.2-HEAD
Diffstat (limited to 'miscutils/taskset.c')
-rw-r--r--miscutils/taskset.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
new file mode 100644
index 000000000..a72f3ff53
--- /dev/null
+++ b/miscutils/taskset.c
@@ -0,0 +1,67 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * taskset - retrieve or set a processes's CPU affinity
+ * Copyright (c) 2006 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+#include <sched.h>
+#include <unistd.h>
+#include <getopt.h> /* optind */
+
+int taskset_main(int argc, char** argv)
+{
+ cpu_set_t mask, new_mask;
+ pid_t pid = 0;
+ unsigned long ul;
+ const char *state = "current\0new";
+ char *p_opt = NULL, *aff = NULL;
+
+ ul = bb_getopt_ulflags(argc, argv, "+p:", &p_opt);
+#define TASKSET_OPT_p (1)
+
+ if (ul & TASKSET_OPT_p) {
+ if (argc == optind+1) { /* -p <aff> <pid> */
+ aff = p_opt;
+ p_opt = argv[optind];
+ }
+ argv += optind; /* me -p <arg> */
+ pid = bb_xgetularg10_bnd(p_opt, 1, ULONG_MAX); /* -p <pid> */
+ } else
+ aff = *++argv; /* <aff> <cmd...> */
+ if (aff) {
+/* to_cpuset(bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX), &new_mask); */
+ unsigned i = 0;
+ unsigned long l = bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX);
+
+ CPU_ZERO(&new_mask);
+ while (i < CPU_SETSIZE && l >= (1<<i)) {
+ if ((1<<i) & l)
+ CPU_SET(i, &new_mask);
+ ++i;
+ }
+ }
+
+ if (ul & TASKSET_OPT_p) {
+print_aff:
+ if (sched_getaffinity(pid, sizeof (mask), &mask) < 0)
+ bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 'g', pid);
+ bb_printf("pid %d's %s affinity mask: %x\n", /* %x .. perhaps _FANCY */
+ pid, state, mask);
+ if (!*argv) /* no new affinity given or we did print already, done. */
+ return EXIT_SUCCESS;
+ }
+
+ if (sched_setaffinity(pid, sizeof (new_mask), &new_mask))
+ bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 's', pid);
+ if (ul & TASKSET_OPT_p) {
+ state += 8;
+ ++argv;
+ goto print_aff;
+ }
+ ++argv;
+ execvp(*argv, argv);
+ bb_perror_msg_and_die("%s", *argv);
+}