diff options
author | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2006-06-07 19:44:59 +0400 |
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committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2006-06-07 19:44:59 +0400 |
commit | 16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73 (patch) | |
tree | 3945b0f4e0293206ac4969a79b73112b9ce29e85 /miscutils/taskset.c | |
parent | ea93f8a397772e515fb54f6051836218112abf3f (diff) |
- add applet taskset to set/retrieve the CPU affinity of a process
text data bss dec hex filename
584 0 0 584 248 taskset.o.gcc-2.95
509 0 0 509 1fd taskset.o.gcc-3.3
505 0 0 505 1f9 taskset.o.gcc-3.4
506 0 0 506 1fa taskset.o.gcc-4.0
498 0 0 498 1f2 taskset.o.gcc-4.1
495 0 0 495 1ef taskset.o.gcc-4.2-HEAD
Diffstat (limited to 'miscutils/taskset.c')
-rw-r--r-- | miscutils/taskset.c | 67 |
1 files changed, 67 insertions, 0 deletions
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); +} |