/*
- * taskset.c - taskset
- * Command-line utility for setting and retrieving a task's CPU affinity
- *
- * Robert Love <rml@tech9.net> 25 April 2002
- *
- * Linux kernels as of 2.5.8 provide the needed syscalls for
- * working with a task's cpu affinity. Currently 2.4 does not
- * support these syscalls, but patches are available at:
- *
- * http://www.kernel.org/pub/linux/kernel/people/rml/cpu-affinity/
+ * taskset.c - command-line utility for setting and retrieving
+ * a task's CPU affinity
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, v2, as
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Copyright (C) 2004 Robert Love
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/syscall.h>
+#include <err.h>
#include "cpuset.h"
+#include "nls.h"
-static void show_usage(const char *cmd)
+static void __attribute__((__noreturn__)) usage(FILE *out)
{
- fprintf(stderr, "taskset (%s)\n", PACKAGE_STRING);
- fprintf(stderr, "usage: %s [options] [mask | cpu-list] [pid |"\
- " cmd [args...]]\n", cmd);
- fprintf(stderr, "set or get the affinity of a process\n\n");
- fprintf(stderr, " -p, --pid "
- "operate on existing given pid\n");
- fprintf(stderr, " -c, --cpu-list "\
- "display and specify cpus in list format\n");
- fprintf(stderr, " -h, --help display this help\n");
- fprintf(stderr, " -V, --version "\
- "output version information\n\n");
- fprintf(stderr, "The default behavior is to run a new command:\n");
- fprintf(stderr, " %s 03 sshd -b 1024\n", cmd);
- fprintf(stderr, "You can retrieve the mask of an existing task:\n");
- fprintf(stderr, " %s -p 700\n", cmd);
- fprintf(stderr, "Or set it:\n");
- fprintf(stderr, " %s -p 03 700\n", cmd);
- fprintf(stderr, "List format uses a comma-separated list instead"\
- " of a mask:\n");
- fprintf(stderr, " %s -pc 0,3,7-11 700\n", cmd);
- fprintf(stderr, "Ranges in list format can take a stride argument:\n");
- fprintf(stderr, " e.g. 0-31:2 is equivalent to mask 0x55555555\n\n");
+ fprintf(out,
+ _("Usage: %s [options] [mask | cpu-list] [pid|cmd [args...]]\n\n"),
+ program_invocation_short_name);
+
+ fprintf(out, _(
+ "Options:\n"
+ " -p, --pid operate on existing given pid\n"
+ " -c, --cpu-list display and specify cpus in list format\n"
+ " -h, --help display this help\n"
+ " -V, --version output version information\n\n"));
+
+ fprintf(out, _(
+ "The default behavior is to run a new command:\n"
+ " %1$s 03 sshd -b 1024\n"
+ "You can retrieve the mask of an existing task:\n"
+ " %1$s -p 700\n"
+ "Or set it:\n"
+ " %1$s -p 03 700\n"
+ "List format uses a comma-separated list instead of a mask:\n"
+ " %1$s -pc 0,3,7-11 700\n"
+ "Ranges in list format can take a stride argument:\n"
+ " e.g. 0-31:2 is equivalent to mask 0x55555555\n"),
+ program_invocation_short_name);
+
+ fprintf(out, _("\nFor more information see taskset(1).\n"));
+
+ exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
/*
* Number of bits in a CPU bitmask on current system
*/
-static int
-max_number_of_cpus(void)
+static int max_number_of_cpus(void)
{
- int n;
- int cpus = 2048;
+ int n, cpus = 2048;
size_t setsize;
cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
/* the library version does not return size of cpumask_t */
n = syscall(SYS_sched_getaffinity, 0, setsize, set);
- if (n < 0 && errno == EINVAL && cpus < 1024*1024) {
+ if (n < 0 && errno == EINVAL && cpus < 1024 * 1024) {
cpuset_free(set);
cpus *= 2;
set = cpuset_alloc(cpus, &setsize, NULL);
continue;
}
cpuset_free(set);
- return n*8;
+ return n * 8;
}
-
err:
- fprintf (stderr, "cannot determine NR_CPUS; aborting");
- exit(1);
+ errx(EXIT_FAILURE, _("cannot determine NR_CPUS; aborting"));
return 0;
}
{
cpu_set_t *new_set, *cur_set;
pid_t pid = 0;
- int opt, err;
+ int opt, c_opt = 0, rc;
char *buf;
- int c_opt = 0;
unsigned int ncpus;
size_t new_setsize, cur_setsize, cur_nbits, buflen;
{ NULL, 0, NULL, 0 }
};
- while ((opt = getopt_long(argc, argv, "+pchV", longopts, NULL)) != -1) {
- int ret = 1;
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ while ((opt = getopt_long(argc, argv, "+pchV", longopts, NULL)) != -1) {
switch (opt) {
case 'p':
pid = atoi(argv[argc - 1]);
break;
case 'V':
printf("taskset (%s)\n", PACKAGE_STRING);
- return 0;
+ return EXIT_SUCCESS;
case 'h':
- ret = 0;
+ usage(stdout);
+ break;
default:
- show_usage(argv[0]);
- return ret;
+ usage(stderr);
+ break;
}
}
if ((!pid && argc - optind < 2)
- || (pid && (argc - optind < 1 || argc - optind > 2))) {
- show_usage(argv[0]);
- return 1;
- }
+ || (pid && (argc - optind < 1 || argc - optind > 2)))
+ usage(stderr);
ncpus = max_number_of_cpus();
/*
- * cur_mask is always used for the sched_getaffinity call
+ * cur_set is always used for the sched_getaffinity call
* On the sched_getaffinity the kernel demands a user mask of
* at least the size of its own cpumask_t.
*/
cur_set = cpuset_alloc(ncpus, &cur_setsize, &cur_nbits);
- if (!cur_set) {
- fprintf (stderr, "cpuset_alloc failed\n");
- exit(1);
- }
+ if (!cur_set)
+ err(EXIT_FAILURE, _("cpuset_alloc failed"));
+
buflen = 7 * cur_nbits;
buf = malloc(buflen);
+ if (!buf)
+ err(EXIT_FAILURE, _("malloc failed"));
/*
- * new_mask is always used for the sched_setaffinity call
+ * new_set is always used for the sched_setaffinity call
* On the sched_setaffinity the kernel will zero-fill its
* cpumask_t if the user's mask is shorter.
*/
new_set = cpuset_alloc(ncpus, &new_setsize, NULL);
- if (!new_set) {
- fprintf (stderr, "cpuset_alloc failed\n");
- exit(1);
- }
+ if (!new_set)
+ err(EXIT_FAILURE, _("cpuset_alloc failed"));
if (pid) {
- if (sched_getaffinity(pid, cur_setsize, cur_set) < 0) {
- perror("sched_getaffinity");
- fprintf(stderr, "failed to get pid %d's affinity\n",
- pid);
- return 1;
- }
+ if (sched_getaffinity(pid, cur_setsize, cur_set) < 0)
+ err(EXIT_FAILURE, _("failed to get pid %d's affinity"), pid);
+
if (c_opt)
- printf("pid %d's current affinity list: %s\n", pid,
+ printf(_("pid %d's current affinity list: %s\n"), pid,
cpulist_create(buf, buflen, cur_set, cur_setsize));
else
- printf("pid %d's current affinity mask: %s\n", pid,
+ printf(_("pid %d's current affinity mask: %s\n"), pid,
cpumask_create(buf, buflen, cur_set, cur_setsize));
if (argc - optind == 1)
- return 0;
+ return EXIT_SUCCESS;
}
- if (c_opt)
- err = cpulist_parse(argv[optind], new_set, new_setsize);
- else
- err = cpumask_parse(argv[optind], new_set, new_setsize);
+ rc = c_opt ? cpulist_parse(argv[optind], new_set, new_setsize) :
+ cpumask_parse(argv[optind], new_set, new_setsize);
- if (err) {
- if (c_opt)
- fprintf(stderr, "failed to parse CPU list %s\n",
- argv[optind]);
- else
- fprintf(stderr, "failed to parse CPU mask %s\n",
+ if (rc)
+ errx(EXIT_FAILURE, _("failed to parse %s %s"),
+ c_opt ? _("CPU list") : _("CPU mask"),
argv[optind]);
- return 1;
- }
- if (sched_setaffinity(pid, new_setsize, new_set) < 0) {
- perror("sched_setaffinity");
- fprintf(stderr, "failed to set pid %d's affinity.\n", pid);
- return 1;
- }
+ if (sched_setaffinity(pid, new_setsize, new_set) < 0)
+ err(EXIT_FAILURE, _("failed to set pid %d's affinity"), pid);
- if (sched_getaffinity(pid, cur_setsize, cur_set) < 0) {
- perror("sched_getaffinity");
- fprintf(stderr, "failed to get pid %d's affinity.\n", pid);
- return 1;
- }
+ if (sched_getaffinity(pid, cur_setsize, cur_set) < 0)
+ err(EXIT_FAILURE, _("failed to get pid %d's affinity"), pid);
if (pid) {
if (c_opt)
- printf("pid %d's new affinity list: %s\n", pid,
+ printf(_("pid %d's new affinity list: %s\n"), pid,
cpulist_create(buf, buflen, cur_set, cur_setsize));
else
- printf("pid %d's new affinity mask: %s\n", pid,
+ printf(_("pid %d's new affinity mask: %s\n"), pid,
cpumask_create(buf, buflen, cur_set, cur_setsize));
}
if (!pid) {
argv += optind + 1;
execvp(argv[0], argv);
- perror("execvp");
- fprintf(stderr, "failed to execute %s\n", argv[0]);
- return 1;
+ err(EXIT_FAILURE, _("executing %s failed"), argv[0]);
}
- return 0;
+ return EXIT_SUCCESS;
}
projects / util-linux / commitdiff