#include <unistd.h>
+#include <fcntl.h>
#include "syscall.h"
-ssize_t readlink(const char *path, char *buf, size_t bufsize)
+ssize_t readlink(const char *restrict path, char *restrict buf, size_t bufsize)
{
- return syscall(SYS_readlink, path, buf, bufsize);
+ char dummy[1];
+ if (!bufsize) {
+ buf = dummy;
+ bufsize = 1;
+ }
+#ifdef SYS_readlink
+ int r = __syscall(SYS_readlink, path, buf, bufsize);
+#else
+ int r = __syscall(SYS_readlinkat, AT_FDCWD, path, buf, bufsize);
+#endif
+ if (buf == dummy && r > 0) r = 0;
+ return __syscall_ret(r);
}