usleep.c

来自「用于嵌入式Linux系统的标准C的库函数」· C语言 代码 · 共 21 行

/* libc/sys/linux/usleep.c - usleep function */

/* Written 2002 by Jeff Johnston */


#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <linux/times.h>

int usleep(__useconds_t useconds)
{
    struct timespec ts;

    ts.tv_sec = (long int)useconds / 1000000;
    ts.tv_nsec = ((long int)useconds % 1000000) * 1000;
    if (!nanosleep(&ts,&ts)) return 0;
    if (errno == EINTR) return ts.tv_sec;
    return -1;
}