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