b44c790e41
chrt,taskset,dc,eject: shrink crontab: call "vi" with just name, no path watchdog: intercept all fatal signals function old new delta xstrtoull_range - 35 +35 static.sg_commands - 18 +18 packed_usage 23698 23712 +14 watchdog_main 148 151 +3 crontab_main 637 638 +1 base 1 - -1 static.ps 4 - -4 pointer 4 - -4 stack_machine 99 92 -7 run_command 273 260 -13 eject_main 360 343 -17 static.C 30 12 -18 ptok 61 38 -23 xstrtol_range 27 - -27 get_token 35 - -35 taskset_main 586 550 -36 chrt_main 411 372 -39 dc_main 158 117 -41 time_main 1127 1037 -90 ------------------------------------------------------------------------------ (add/remove: 2/5 grow/shrink: 3/9 up/down: 71/-355) Total: -284 bytes text data bss dec hex filename 793680 662 7420 801762 c3be2 busybox_old 793327 662 7412 801401 c3a79 busybox_unstripped
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* taskset - retrieve or set a processes' 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 <sched.h>
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#include <getopt.h> /* optind */
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#include "libbb.h"
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#if ENABLE_FEATURE_TASKSET_FANCY
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#define TASKSET_PRINTF_MASK "%s"
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#define from_cpuset(x) __from_cpuset(&x)
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/* craft a string from the mask */
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static char *__from_cpuset(cpu_set_t *mask)
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{
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int i;
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char *ret = 0, *str = xzalloc(9);
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for (i = CPU_SETSIZE - 4; i >= 0; i -= 4) {
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char val = 0;
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int off;
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for (off = 0; off <= 3; ++off)
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if (CPU_ISSET(i+off, mask))
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val |= 1<<off;
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if (!ret && val)
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ret = str;
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*str++ = (val-'0'<=9) ? (val+48) : (val+87);
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}
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return ret;
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}
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#else
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#define TASKSET_PRINTF_MASK "%x"
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/* (void*) cast is for battling gcc: */
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/* "dereferencing type-punned pointer will break strict-aliasing rules" */
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#define from_cpuset(mask) (*(unsigned*)(void*)&(mask))
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#endif
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int taskset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int taskset_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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cpu_set_t mask;
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pid_t pid = 0;
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unsigned opt_p;
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const char *current_new;
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char *pid_str;
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char *aff = aff; /* for compiler */
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opt_complementary = "-1"; /* at least 1 arg */
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opt_p = getopt32(argv, "+p");
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argv += optind;
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if (opt_p) {
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pid_str = *argv++;
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if (*argv) { /* "-p <aff> <pid> ...rest.is.ignored..." */
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aff = pid_str;
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pid_str = *argv; /* NB: *argv != NULL in this case */
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}
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/* else it was just "-p <pid>", and *argv == NULL */
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pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
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} else {
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aff = *argv++; /* <aff> <cmd...> */
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if (!*argv)
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bb_show_usage();
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}
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current_new = "current\0new";
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if (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("can't %cet pid %d's affinity", 'g', pid);
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printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
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pid, current_new, from_cpuset(mask));
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if (!*argv) {
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/* Either it was just "-p <pid>",
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* or it was "-p <aff> <pid>" and we came here
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* for the second time (see goto below) */
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return EXIT_SUCCESS;
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}
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*argv = NULL;
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current_new += 8; /* "new" */
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}
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{ /* Affinity was specified, translate it into cpu_set_t */
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unsigned i;
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/* Do not allow zero mask: */
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unsigned long long m = xstrtoull_range(aff, 0, 1, ULLONG_MAX);
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CPU_ZERO(&mask);
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for (i = 0; i < CPU_SETSIZE; i++) {
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unsigned long long bit = (1ULL << i);
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if (bit & m)
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CPU_SET(i, &mask);
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}
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}
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/* Set pid's or our own (pid==0) affinity */
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if (sched_setaffinity(pid, sizeof(mask), &mask))
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bb_perror_msg_and_die("can't %cet pid %d's affinity", 's', pid);
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if (!*argv) /* "-p <aff> <pid> [...ignored...]" */
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goto print_aff; /* print new affinity and exit */
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BB_EXECVP(*argv, argv);
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bb_simple_perror_msg_and_die(*argv);
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}
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