Путь: Toys/Other, команды версии: Ver.4 Ver.9 Комментарии в файле taskset.c : Команд: 2 nproc
taskset
Исходный текст в файле taskset.c #define FOR_taskset #include "toys.h" // mask is array of long which makes layout a bit weird on big endian systems #define sched_setaffinity(pid, size, cpuset) \ syscall(__NR_sched_setaffinity, (pid_t)pid, (size_t)size, (void *)cpuset) #define sched_getaffinity(pid, size, cpuset) \ syscall(__NR_sched_getaffinity, (pid_t)pid, (size_t)size, (void *)cpuset) static void do_taskset(pid_t pid, int quiet) { unsigned long *mask = (unsigned long *)toybuf; char *s, *failed = "failed to %s pid %d's affinity"; int i, j, k; // loop through twice to display before/after affinity masks for (i=0; ; i++) { if (!quiet) { if (-1 == sched_getaffinity(pid, sizeof(toybuf), (void *)mask)) perror_exit(failed, "get", pid); printf("pid %d's %s affinity mask: ", pid, i ? "new" : "current"); for (j = sizeof(toybuf)/sizeof(long), k = 0; --j>=0;) { if (k) printf("%0*lx", (int)(2*sizeof(long)), mask[j]); else if (mask[j]) { k++; printf("%lx", mask[j]); } } putchar('\n'); } if (i || toys.optc < 2) return; // Convert hex strong to mask[] bits memset(toybuf, 0, sizeof(toybuf)); k = strlen(s = *toys.optargs); s += k; for (j = 0; j<k; j++) { unsigned long digit = *(--s) - '0'; if (digit > 9) digit = 10 + tolower(*s)-'a'; if (digit > 15) error_exit("bad mask '%s'", *toys.optargs); mask[j/(2*sizeof(long))] |= digit << 4*(j&((2*sizeof(long))-1)); } if (-1 == sched_setaffinity(pid, sizeof(toybuf), (void *)mask)) perror_exit(failed, "set", pid); } } static int task_callback(struct dirtree *new) { if (!new->parent) return DIRTREE_RECURSE|DIRTREE_SHUTUP|DIRTREE_PROC; do_taskset(atoi(new->name), 0); return 0; } void taskset_main(void) { if (!FLAG(p)) { if (toys.optc < 2) error_exit("Needs 2 args"); do_taskset(getpid(), 1); xexec(toys.optargs+1); } else { char *c, buf[33]; pid_t pid = strtol(toys.optargs[toys.optc-1], &c, 10); if (*c) error_exit("Not int %s", toys.optargs[toys.optc-1]); if (FLAG(a)) { sprintf(buf, "/proc/%ld/task/", (long)pid); dirtree_read(buf, task_callback); } else do_taskset(pid, 0); } } void nproc_main(void) { unsigned i, j, nproc = 0; DIR *dd; // This can only detect 32768 processors. Call getaffinity and count bits. if (!toys.optflags && -1!=sched_getaffinity(getpid(), 4096, toybuf)) for (i = 0; i<4096; i++) if (toybuf[i]) for (j=0; j<8; j++) if (toybuf[i]&(1<<j)) nproc++; // If getaffinity failed or --all, count cpu entries in sysfs // (/proc/cpuinfo filters out hot-unplugged CPUs, sysfs doesn't) if (!nproc && (dd = opendir("/sys/devices/system/cpu"))) { struct dirent *de; char *ss; while ((de = readdir(dd))) { if (smemcmp(de->d_name, "cpu", 3)) continue; for (ss = de->d_name+3; isdigit(*ss); ss++); if (!*ss) nproc++; } closedir(dd); } xprintf("%u\n", nproc ? : 1); } |