readlinkat.c\unistd\src - musl - musl - an implementation of the standard library for Linux-based systems

#include <unistd.h>
#include "syscall.h"
ssize_t readlinkat(int fd, const char *restrict path, char *restrict buf, size_t bufsize)
{
	char dummy[1];
	if (!bufsize) {
		buf = dummy;
		bufsize = 1;
	}
	int r = __syscall(SYS_readlinkat, fd, path, buf, bufsize);
	if (buf == dummy && r > 0) r = 0;
	return __syscall_ret(r);
}