Listing 1. bind
/* bind - simple command-line tool to set CPU
* affinity of a given task
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
int main(int argc, char *argv[])
{
unsigned long new_mask;
unsigned long cur_mask;
unsigned int len = sizeof(new_mask);
pid_t pid;
if (argc != 3) {
fprintf(stderr,
"usage: %s [pid] [cpu_mask]\n",
argv[0]);
return -1;
}
pid = atol(argv[1]);
sscanf(argv[2], "%08lx", &new_mask);
if (sched_getaffinity(pid, len,
&cur_mask) < 0) {
perror("sched_getaffinity");
return -1;
}
printf("pid %d's old affinity: %08lx\n",
pid, cur_mask);
if (sched_setaffinity(pid, len, &new_mask)) {
perror("sched_setaffinity");
return -1;
}
if (sched_getaffinity(pid, len,
&cur_mask) < 0) {
perror("sched_getaffinity");
return -1;
}
printf(" pid %d's new affinity: %08lx\n",
pid, cur_mask);
return 0;
}
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