diff options
Diffstat (limited to 'miscutils')
| -rw-r--r-- | miscutils/Config.in | 6 | ||||
| -rw-r--r-- | miscutils/Makefile.in | 1 | ||||
| -rw-r--r-- | miscutils/taskset.c | 67 |
3 files changed, 74 insertions, 0 deletions
diff --git a/miscutils/Config.in b/miscutils/Config.in index fc90b5447..37c1de8b9 100644 --- a/miscutils/Config.in +++ b/miscutils/Config.in @@ -291,6 +291,12 @@ config CONFIG_SETSID help setsid runs a program in a new session +config CONFIG_TASKSET + bool "taskset" + default n + help + Retrieve or set a processes's CPU affinity (on linux) + config CONFIG_TIME bool "time" default n diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in index a0b6b7233..d60d687b0 100644 --- a/miscutils/Makefile.in +++ b/miscutils/Makefile.in @@ -28,6 +28,7 @@ MISCUTILS-$(CONFIG_RUNLEVEL) += runlevel.o MISCUTILS-$(CONFIG_RX) += rx.o MISCUTILS-$(CONFIG_SETSID) += setsid.o MISCUTILS-$(CONFIG_STRINGS) += strings.o +MISCUTILS-$(CONFIG_TASKSET) += taskset.o MISCUTILS-$(CONFIG_TIME) += time.o MISCUTILS-$(CONFIG_WATCHDOG) += watchdog.o diff --git a/miscutils/taskset.c b/miscutils/taskset.c new file mode 100644 index 000000000..a72f3ff53 --- /dev/null +++ b/miscutils/taskset.c @@ -0,0 +1,67 @@ +/* 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); +} |