uclibc-ng/libc/sysdeps/linux/common/gettimeofday.c

/*
 * gettimeofday() for uClibc
 *
 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <sys/syscall.h>
#include <sys/time.h>
#include <time.h>

#ifdef __VDSO_SUPPORT__
#include "ldso.h"
#endif

#ifdef __VDSO_SUPPORT__
typedef int (*gettimeofday_func)(struct timeval * tv, __timezone_ptr_t tz);
#endif

int gettimeofday(struct timeval * tv, __timezone_ptr_t tz) {

    #ifdef __VDSO_SUPPORT__
        if ( _dl__vdso_gettimeofday != 0 ){
            gettimeofday_func func= _dl__vdso_gettimeofday;
            return func( tv, tz );

        }else{
            _syscall2_body(int, gettimeofday, struct timeval *, tv, __timezone_ptr_t, tz)
        }
    #else
        if (!tv)
            return 0;

        struct timespec __ts;
        int __ret = clock_gettime(CLOCK_REALTIME, &__ts);
        tv->tv_sec = __ts.tv_sec;
        tv->tv_usec = (suseconds_t)__ts.tv_nsec / 1000;
        return __ret;
    #endif
}


libc_hidden_def(gettimeofday)