getrandom syscall

["Daniel Cegiełka" <daniel.cegielka@gmail.com>]

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best regards,
Daniel

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#include <stddef.h>
#include <errno.h>
#include "syscall.h"

int getrandom(void *buf, size_t len)
{
	int ret, pre_errno = errno;

	if (len > 256) {
		errno = EIO;
		return -1;
	}
	do {
		ret = syscall(SYS_getrandom, buf, len, 0);
	} while (ret == -1 && errno == EINTR);
	if (ret != len)
		return -1;
	errno = pre_errno;
	return 0;
}