musl/src/time/gettimeofday.c

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

int gettimeofday(struct timeval *restrict tv, void *restrict tz)
{
	struct timespec ts;
	if (!tv) return 0;
	clock_gettime(CLOCK_REALTIME, &ts);
	tv->tv_sec = ts.tv_sec;
	tv->tv_usec = (int)ts.tv_nsec / 1000;
	return 0;
}
some preliminaries for vdso clock support these changes also make it so clock_gettime(CLOCK_REALTIME, &ts) works even on pre-2.6 kernels, emulated via the gettimeofday syscall. there is no cost for the fallback check, as it falls under the error case that already must be checked for storing the error code in errno, but which would normally be hidden inside __syscall_ret. 2011-07-23 23:45:33 -04:00			`#include <time.h>`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include <sys/time.h>`
			`#include "syscall.h"`

use restrict everywhere it's required by c99 and/or posix 2008 to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict. 2012-09-06 22:44:55 -04:00			`int gettimeofday(struct timeval restrict tv, void restrict tz)`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`{`
some preliminaries for vdso clock support these changes also make it so clock_gettime(CLOCK_REALTIME, &ts) works even on pre-2.6 kernels, emulated via the gettimeofday syscall. there is no cost for the fallback check, as it falls under the error case that already must be checked for storing the error code in errno, but which would normally be hidden inside __syscall_ret. 2011-07-23 23:45:33 -04:00			`struct timespec ts;`
			`if (!tv) return 0;`
			`clock_gettime(CLOCK_REALTIME, &ts);`
			`tv->tv_sec = ts.tv_sec;`
			`tv->tv_usec = (int)ts.tv_nsec / 1000;`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`return 0;`
			`}`