libosdp-sys 3.2.1

Sys crate for https://github.com/goToMain/libosdp
Documentation 
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#include <fcntl.h>
#include <errno.h>
#include <unistd.h>

#include <utils/random.h>

#ifdef __linux__
#include <sys/syscall.h>
#endif
#ifdef __APPLE__
#include <AvailabilityMacros.h>
#ifndef MAC_OS_X_VERSION_10_12
#define MAC_OS_X_VERSION_10_12 101200
#endif
#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12
#include <sys/random.h>
#endif
#endif

#ifndef _WIN32
bool __attribute__((__warn_unused_result__)) get_random_bytes(uint8_t *out, size_t len)
{
	ssize_t ret = 0;
	size_t i;
	int fd;

	if (len > 256) {
		errno = EOVERFLOW;
		return false;
	}

#if defined(__OpenBSD__) || \
	(defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12) || \
	(defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)))
	if (!getentropy(out, len))
		return true;
#endif

#if defined(__NR_getrandom) && defined(__linux__)
	if (syscall(__NR_getrandom, out, len, 0) == (ssize_t)len)
		return true;
#endif

	fd = open("/dev/urandom", O_RDONLY);
	if (fd < 0)
		return false;
	for (errno = 0, i = 0; i < len; i += ret, ret = 0) {
		ret = read(fd, out + i, len - i);
		if (ret <= 0) {
			ret = errno ? -errno : -EIO;
			break;
		}
	}
	close(fd);
	errno = -ret;
	return i == len;
}
#else
#include <ntsecapi.h>
bool __attribute__((__warn_unused_result__)) get_random_bytes(uint8_t *out, size_t len)
{
        return RtlGenRandom(out, len);
}
#endif