2006-12-06 17:26:54 -06:00
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/*
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* taskset.c - taskset
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* Command-line utility for setting and retrieving a task's CPU affinity
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*
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* Robert Love <rml@tech9.net> 25 April 2002
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*
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* Linux kernels as of 2.5.8 provide the needed syscalls for
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* working with a task's cpu affinity. Currently 2.4 does not
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* support these syscalls, but patches are available at:
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*
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* http://www.kernel.org/pub/linux/kernel/people/rml/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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Copyright (C) 2004 Robert Love
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*/
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#define _GNU_SOURCE
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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 <sched.h>
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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static void show_usage(const char *cmd)
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{
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2006-12-06 17:26:58 -06:00
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fprintf(stderr, "taskset (%s)\n", PACKAGE_STRING);
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2006-12-06 17:26:54 -06:00
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fprintf(stderr, "usage: %s [options] [mask | cpu-list] [pid |"\
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" cmd [args...]]\n", cmd);
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fprintf(stderr, "set or get the affinity of a process\n\n");
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fprintf(stderr, " -p, --pid "
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"operate on existing given pid\n");
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fprintf(stderr, " -c, --cpu-list "\
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"display and specify cpus in list format\n");
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fprintf(stderr, " -h, --help display this help\n");
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fprintf(stderr, " -v, --version "\
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"output version information\n\n");
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fprintf(stderr, "The default behavior is to run a new command:\n");
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fprintf(stderr, " %s 03 sshd -b 1024\n", cmd);
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fprintf(stderr, "You can retrieve the mask of an existing task:\n");
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fprintf(stderr, " %s -p 700\n", cmd);
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fprintf(stderr, "Or set it:\n");
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fprintf(stderr, " %s -p 03 700\n", cmd);
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fprintf(stderr, "List format uses a comma-separated list instead"\
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" of a mask:\n");
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fprintf(stderr, " %s -pc 0,3,7-11 700\n", cmd);
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fprintf(stderr, "Ranges in list format can take a stride argument:\n");
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fprintf(stderr, " e.g. 0-31:2 is equivalent to mask 0x55555555\n\n");
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}
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static inline int val_to_char(int v)
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{
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if (v >= 0 && v < 10)
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return '0' + v;
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else if (v >= 10 && v < 16)
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return ('a' - 10) + v;
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else
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return -1;
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}
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static char * cpuset_to_str(cpu_set_t *mask, char *str)
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{
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int base;
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char *ptr = str;
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char *ret = 0;
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for (base = CPU_SETSIZE - 4; base >= 0; base -= 4) {
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char val = 0;
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if (CPU_ISSET(base, mask))
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val |= 1;
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if (CPU_ISSET(base + 1, mask))
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val |= 2;
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if (CPU_ISSET(base + 2, mask))
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val |= 4;
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if (CPU_ISSET(base + 3, mask))
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val |= 8;
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if (!ret && val)
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ret = ptr;
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*ptr++ = val_to_char(val);
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}
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*ptr = 0;
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return ret ? ret : ptr - 1;
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}
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static char * cpuset_to_cstr(cpu_set_t *mask, char *str)
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{
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int i;
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char *ptr = str;
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int entry_made = 0;
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for (i = 0; i < CPU_SETSIZE; i++) {
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if (CPU_ISSET(i, mask)) {
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int j;
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int run = 0;
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entry_made = 1;
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for (j = i + 1; j < CPU_SETSIZE; j++) {
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if (CPU_ISSET(j, mask))
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run++;
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else
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break;
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}
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if (!run)
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sprintf(ptr, "%d,", i);
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else if (run == 1) {
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sprintf(ptr, "%d,%d,", i, i + 1);
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i++;
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} else {
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sprintf(ptr, "%d-%d,", i, i + run);
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i += run;
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}
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while (*ptr != 0)
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ptr++;
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}
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}
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ptr -= entry_made;
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*ptr = 0;
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return str;
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}
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static inline int char_to_val(int c)
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{
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int cl;
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cl = tolower(c);
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if (c >= '0' && c <= '9')
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return c - '0';
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else if (cl >= 'a' && cl <= 'f')
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return cl + (10 - 'a');
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else
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return -1;
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}
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static int str_to_cpuset(cpu_set_t *mask, const char* str)
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{
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int len = strlen(str);
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const char *ptr = str + len - 1;
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int base = 0;
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/* skip 0x, it's all hex anyway */
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if (len > 1 && !memcmp(str, "0x", 2L))
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str += 2;
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CPU_ZERO(mask);
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while (ptr >= str) {
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char val = char_to_val(*ptr);
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if (val == (char) -1)
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return -1;
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if (val & 1)
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CPU_SET(base, mask);
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if (val & 2)
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CPU_SET(base + 1, mask);
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if (val & 4)
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CPU_SET(base + 2, mask);
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if (val & 8)
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CPU_SET(base + 3, mask);
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len--;
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ptr--;
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base += 4;
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}
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return 0;
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}
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static const char *nexttoken(const char *q, int sep)
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{
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if (q)
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q = strchr(q, sep);
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if (q)
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q++;
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return q;
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}
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static int cstr_to_cpuset(cpu_set_t *mask, const char* str)
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{
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const char *p, *q;
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q = str;
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CPU_ZERO(mask);
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while (p = q, q = nexttoken(q, ','), p) {
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unsigned int a; /* beginning of range */
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unsigned int b; /* end of range */
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unsigned int s; /* stride */
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const char *c1, *c2;
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if (sscanf(p, "%u", &a) < 1)
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return 1;
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b = a;
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s = 1;
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c1 = nexttoken(p, '-');
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c2 = nexttoken(p, ',');
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if (c1 != NULL && (c2 == NULL || c1 < c2)) {
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if (sscanf(c1, "%u", &b) < 1)
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return 1;
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c1 = nexttoken(c1, ':');
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if (c1 != NULL && (c2 == NULL || c1 < c2))
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if (sscanf(c1, "%u", &s) < 1) {
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return 1;
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}
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}
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if (!(a <= b))
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return 1;
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while (a <= b) {
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CPU_SET(a, mask);
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a += s;
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}
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}
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return 0;
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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_mask, cur_mask;
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pid_t pid = 0;
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int opt, err;
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char mstr[1 + CPU_SETSIZE / 4];
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char cstr[7 * CPU_SETSIZE];
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int c_opt = 0;
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struct option longopts[] = {
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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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while ((opt = getopt_long(argc, argv, "+pchV", longopts, NULL)) != -1) {
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int ret = 1;
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switch (opt) {
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case 'p':
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pid = atoi(argv[argc - 1]);
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break;
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case 'c':
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c_opt = 1;
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break;
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case 'V':
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2006-12-06 17:26:58 -06:00
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printf("taskset (%s)\n", PACKAGE_STRING);
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2006-12-06 17:26:54 -06:00
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return 0;
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case 'h':
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ret = 0;
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default:
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show_usage(argv[0]);
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return ret;
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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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show_usage(argv[0]);
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return 1;
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}
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if (pid) {
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if (sched_getaffinity(pid, sizeof (cur_mask), &cur_mask) < 0) {
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perror("sched_getaffinity");
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fprintf(stderr, "failed to get pid %d's affinity\n",
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pid);
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return 1;
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}
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if (c_opt)
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printf("pid %d's current affinity list: %s\n", pid,
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cpuset_to_cstr(&cur_mask, cstr));
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else
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printf("pid %d's current affinity mask: %s\n", pid,
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cpuset_to_str(&cur_mask, mstr));
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if (argc - optind == 1)
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return 0;
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}
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if (c_opt)
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err = cstr_to_cpuset(&new_mask, argv[optind]);
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else
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err = str_to_cpuset(&new_mask, argv[optind]);
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if (err) {
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if (c_opt)
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fprintf(stderr, "failed to parse CPU list %s\n",
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argv[optind]);
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else
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fprintf(stderr, "failed to parse CPU mask %s\n",
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argv[optind]);
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return 1;
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}
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if (sched_setaffinity(pid, sizeof (new_mask), &new_mask)) {
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perror("sched_setaffinity");
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fprintf(stderr, "failed to set pid %d's affinity.\n", pid);
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return 1;
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}
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if (sched_getaffinity(pid, sizeof (cur_mask), &cur_mask) < 0) {
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perror("sched_getaffinity");
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fprintf(stderr, "failed to get pid %d's affinity.\n", pid);
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return 1;
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}
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if (pid) {
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if (c_opt)
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printf("pid %d's new affinity list: %s\n", pid,
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cpuset_to_cstr(&cur_mask, cstr));
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else
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printf("pid %d's new affinity mask: %s\n", pid,
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cpuset_to_str(&cur_mask, mstr));
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} else {
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argv += optind + 1;
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execvp(argv[0], argv);
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perror("execvp");
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fprintf(stderr, "failed to execute %s\n", argv[0]);
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return 1;
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}
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return 0;
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}
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