68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
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/* vi: set sw=4 ts=4: */
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/*
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* taskset - retrieve or set a processes's CPU affinity
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* Copyright (c) 2006 Bernhard Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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#include <sched.h>
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#include <unistd.h>
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#include <getopt.h> /* optind */
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int taskset_main(int argc, char** argv)
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{
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cpu_set_t mask, new_mask;
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pid_t pid = 0;
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unsigned long ul;
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const char *state = "current\0new";
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char *p_opt = NULL, *aff = NULL;
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ul = bb_getopt_ulflags(argc, argv, "+p:", &p_opt);
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#define TASKSET_OPT_p (1)
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if (ul & TASKSET_OPT_p) {
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if (argc == optind+1) { /* -p <aff> <pid> */
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aff = p_opt;
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p_opt = argv[optind];
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}
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argv += optind; /* me -p <arg> */
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pid = bb_xgetularg10_bnd(p_opt, 1, ULONG_MAX); /* -p <pid> */
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} else
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aff = *++argv; /* <aff> <cmd...> */
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if (aff) {
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/* to_cpuset(bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX), &new_mask); */
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unsigned i = 0;
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unsigned long l = bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX);
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CPU_ZERO(&new_mask);
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while (i < CPU_SETSIZE && l >= (1<<i)) {
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if ((1<<i) & l)
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CPU_SET(i, &new_mask);
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++i;
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}
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}
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if (ul & TASKSET_OPT_p) {
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print_aff:
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if (sched_getaffinity(pid, sizeof (mask), &mask) < 0)
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bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 'g', pid);
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bb_printf("pid %d's %s affinity mask: %x\n", /* %x .. perhaps _FANCY */
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pid, state, mask);
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if (!*argv) /* no new affinity given or we did print already, done. */
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return EXIT_SUCCESS;
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}
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if (sched_setaffinity(pid, sizeof (new_mask), &new_mask))
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bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 's', pid);
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if (ul & TASKSET_OPT_p) {
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state += 8;
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++argv;
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goto print_aff;
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}
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++argv;
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execvp(*argv, argv);
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bb_perror_msg_and_die("%s", *argv);
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}
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