mirror of
https://github.com/upa/mscp.git
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166 lines
2.9 KiB
C
166 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-3.0-only */
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#ifdef __APPLE__
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#elif linux
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sched.h>
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#elif __FreeBSD__
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <pthread_np.h>
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#else
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#error unsupported platform
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#endif
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#include <platform.h>
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#include <strerrno.h>
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#include <print.h>
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#ifdef __APPLE__
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int nr_cpus()
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{
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int n;
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size_t size = sizeof(n);
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if (sysctlbyname("machdep.cpu.core_count", &n, &size, NULL, 0) != 0) {
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priv_set_errv("failed to get number of cpu cores: %s", strerrno());
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return -1;
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}
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return n;
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}
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int set_thread_affinity(pthread_t tid, int core)
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{
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pr_warn("setting thread afinity is not implemented on apple");
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return 0;
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}
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int setutimes(const char *path, struct timespec atime, struct timespec mtime)
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{
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struct timeval tv[2] = {
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{
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.tv_sec = atime.tv_sec,
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.tv_usec = atime.tv_nsec * 1000,
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},
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{
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.tv_sec = mtime.tv_sec,
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.tv_usec = mtime.tv_nsec * 1000,
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},
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};
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return utimes(path, tv);
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}
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static void random_string(char *buf, size_t size)
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{
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char chars[] = "abcdefhijklmnopqrstuvwxyz1234567890";
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int n, x;
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for (n = 0; n < size - 1; n++) {
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x = arc4random() % (sizeof(chars) - 1);
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buf[n] = chars[x];
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}
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buf[size - 1] = '\0';
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}
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sem_t *sem_create(int value)
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{
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char sem_name[30] = "mscp-";
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sem_t *sem;
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int n;
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n = strlen(sem_name);
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random_string(sem_name + n, sizeof(sem_name) - n - 1);
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if ((sem = sem_open(sem_name, O_CREAT, 600, value)) == SEM_FAILED)
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return NULL;
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return sem;
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}
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int sem_release(sem_t *sem)
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{
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return sem_close(sem);
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}
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#endif
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#ifdef linux
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int nr_cpus()
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{
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cpu_set_t cpu_set;
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if (sched_getaffinity(0, sizeof(cpu_set_t), &cpu_set) == 0)
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return CPU_COUNT(&cpu_set);
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return -1;
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}
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#endif
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#ifdef __FreeBSD__
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int nr_cpus()
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{
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long nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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return nr_cpus;
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}
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#endif
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#if defined(linux) || defined(__FreeBSD__)
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int set_thread_affinity(pthread_t tid, int core)
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{
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cpu_set_t target_cpu_set;
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int ret = 0;
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CPU_ZERO(&target_cpu_set);
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CPU_SET(core, &target_cpu_set);
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ret = pthread_setaffinity_np(tid, sizeof(target_cpu_set), &target_cpu_set);
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if (ret < 0)
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priv_set_errv("failed to set thread/cpu affinity for core %d: %s", core,
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strerrno());
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return ret;
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}
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int setutimes(const char *path, struct timespec atime, struct timespec mtime)
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{
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struct timespec ts[2] = { atime, mtime };
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int fd = open(path, O_WRONLY);
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int ret;
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if (fd < 0)
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return -1;
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ret = futimens(fd, ts);
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close(fd);
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return ret;
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}
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sem_t *sem_create(int value)
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{
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sem_t *sem;
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if ((sem = malloc(sizeof(*sem))) == NULL)
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return NULL;
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if (sem_init(sem, 0, value) < 0) {
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free(sem);
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return NULL;
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}
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return sem;
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}
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int sem_release(sem_t *sem)
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{
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free(sem);
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return 0;
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}
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#endif
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