242 lines
6.4 KiB
C
242 lines
6.4 KiB
C
/*
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* taskset.c - command-line utility for setting and retrieving
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* a task's CPU affinity
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, v2, as
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* published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright (C) 2004 Robert Love
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* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <errno.h>
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#include <sched.h>
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#include <stddef.h>
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#include <string.h>
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#include "cpuset.h"
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#include "nls.h"
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#include "strutils.h"
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#include "xalloc.h"
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#include "procutils.h"
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#include "c.h"
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#include "closestream.h"
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struct taskset {
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pid_t pid; /* task PID */
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cpu_set_t *set; /* task CPU mask */
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size_t setsize;
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char *buf; /* buffer for conversion from mask to string */
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size_t buflen;
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unsigned int use_list:1, /* use list rather than masks */
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get_only:1; /* print the mask, but not modify */
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};
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static void __attribute__((__noreturn__)) usage(FILE *out)
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{
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fprintf(out,
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_("Usage: %s [options] [mask | cpu-list] [pid|cmd [args...]]\n\n"),
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program_invocation_short_name);
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fprintf(out, _(
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"Options:\n"
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" -a, --all-tasks operate on all the tasks (threads) for a given pid\n"
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" -p, --pid operate on existing given pid\n"
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" -c, --cpu-list display and specify cpus in list format\n"
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" -h, --help display this help\n"
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" -V, --version output version information\n\n"));
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fprintf(out, _(
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"The default behavior is to run a new command:\n"
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" %1$s 03 sshd -b 1024\n"
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"You can retrieve the mask of an existing task:\n"
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" %1$s -p 700\n"
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"Or set it:\n"
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" %1$s -p 03 700\n"
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"List format uses a comma-separated list instead of a mask:\n"
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" %1$s -pc 0,3,7-11 700\n"
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"Ranges in list format can take a stride argument:\n"
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" e.g. 0-31:2 is equivalent to mask 0x55555555\n"),
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program_invocation_short_name);
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fprintf(out, _("\nFor more information see taskset(1).\n"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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static void print_affinity(struct taskset *ts, int isnew)
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{
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char *str, *msg;
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if (ts->use_list) {
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str = cpulist_create(ts->buf, ts->buflen, ts->set, ts->setsize);
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msg = isnew ? _("pid %d's new affinity list: %s\n") :
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_("pid %d's current affinity list: %s\n");
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} else {
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str = cpumask_create(ts->buf, ts->buflen, ts->set, ts->setsize);
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msg = isnew ? _("pid %d's new affinity mask: %s\n") :
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_("pid %d's current affinity mask: %s\n");
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}
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if (!str)
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errx(EXIT_FAILURE, _("internal error: conversion from cpuset to string failed"));
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printf(msg, ts->pid, str);
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}
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static void do_taskset(struct taskset *ts, size_t setsize, cpu_set_t *set)
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{
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/* read the current mask */
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if (ts->pid) {
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if (sched_getaffinity(ts->pid, ts->setsize, ts->set) < 0)
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err(EXIT_FAILURE, _("failed to get pid %d's affinity"),
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ts->pid);
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print_affinity(ts, FALSE);
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}
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if (ts->get_only)
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return;
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/* set new mask */
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if (sched_setaffinity(ts->pid, setsize, set) < 0)
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err(EXIT_FAILURE, _("failed to set pid %d's affinity"),
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ts->pid);
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/* re-read the current mask */
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if (ts->pid) {
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if (sched_getaffinity(ts->pid, ts->setsize, ts->set) < 0)
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err(EXIT_FAILURE, _("failed to get pid %d's affinity"),
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ts->pid);
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print_affinity(ts, TRUE);
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}
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}
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int main(int argc, char **argv)
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{
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cpu_set_t *new_set;
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pid_t pid = 0;
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int c, all_tasks = 0;
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int ncpus;
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size_t new_setsize, nbits;
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struct taskset ts;
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static const struct option longopts[] = {
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{ "all-tasks", 0, NULL, 'a' },
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{ "pid", 0, NULL, 'p' },
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{ "cpu-list", 0, NULL, 'c' },
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{ "help", 0, NULL, 'h' },
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{ "version", 0, NULL, 'V' },
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{ NULL, 0, NULL, 0 }
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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memset(&ts, 0, sizeof(ts));
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while ((c = getopt_long(argc, argv, "+apchV", longopts, NULL)) != -1) {
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switch (c) {
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case 'a':
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all_tasks = 1;
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break;
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case 'p':
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pid = strtos32_or_err(argv[argc - 1],
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_("invalid PID argument"));
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break;
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case 'c':
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ts.use_list = 1;
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break;
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case 'V':
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printf(_("%s from %s\n"), program_invocation_short_name,
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PACKAGE_STRING);
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return EXIT_SUCCESS;
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case 'h':
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usage(stdout);
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break;
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default:
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usage(stderr);
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break;
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}
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}
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if ((!pid && argc - optind < 2)
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|| (pid && (argc - optind < 1 || argc - optind > 2)))
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usage(stderr);
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ncpus = get_max_number_of_cpus();
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if (ncpus <= 0)
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errx(EXIT_FAILURE, _("cannot determine NR_CPUS; aborting"));
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/*
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* the ts->set is always used for the sched_getaffinity call
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* On the sched_getaffinity the kernel demands a user mask of
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* at least the size of its own cpumask_t.
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*/
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ts.set = cpuset_alloc(ncpus, &ts.setsize, &nbits);
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if (!ts.set)
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err(EXIT_FAILURE, _("cpuset_alloc failed"));
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/* buffer for conversion from mask to string */
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ts.buflen = 7 * nbits;
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ts.buf = xmalloc(ts.buflen);
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/*
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* new_set is always used for the sched_setaffinity call
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* On the sched_setaffinity the kernel will zero-fill its
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* cpumask_t if the user's mask is shorter.
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*/
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new_set = cpuset_alloc(ncpus, &new_setsize, NULL);
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if (!new_set)
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err(EXIT_FAILURE, _("cpuset_alloc failed"));
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if (argc - optind == 1)
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ts.get_only = 1;
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else if (ts.use_list) {
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if (cpulist_parse(argv[optind], new_set, new_setsize, 0))
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errx(EXIT_FAILURE, _("failed to parse CPU list: %s"),
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argv[optind]);
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} else if (cpumask_parse(argv[optind], new_set, new_setsize)) {
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errx(EXIT_FAILURE, _("failed to parse CPU mask: %s"),
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argv[optind]);
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}
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if (all_tasks && pid) {
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struct proc_tasks *tasks = proc_open_tasks(pid);
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while (!proc_next_tid(tasks, &ts.pid))
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do_taskset(&ts, new_setsize, new_set);
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proc_close_tasks(tasks);
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} else {
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ts.pid = pid;
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do_taskset(&ts, new_setsize, new_set);
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}
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free(ts.buf);
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cpuset_free(ts.set);
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cpuset_free(new_set);
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if (!pid) {
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argv += optind + 1;
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execvp(argv[0], argv);
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err(EXIT_FAILURE, _("failed to execute %s"), argv[0]);
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}
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return EXIT_SUCCESS;
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}
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