libroot/unistd: dup3 should return EINVAL if oldFD == newFD.

As per POSIX-2024. Fixes #19476.
2025-03-12 22:01:57 -04:00
parent 0d73795fc9
commit d68fa86ee1
1 changed files with 3 additions and 1 deletions
@@ -22,12 +22,14 @@ dup(int fd)
 int
 dup2(int oldFD, int newFD)
 {
-	return dup3(oldFD, newFD, 0);
+	RETURN_AND_SET_ERRNO(_kern_dup2(oldFD, newFD, 0));
 }


 int
 dup3(int oldFD, int newFD, int flags)
 {
+	if (oldFD == newFD)
+		RETURN_AND_SET_ERRNO(EINVAL);
 	RETURN_AND_SET_ERRNO(_kern_dup2(oldFD, newFD, flags));
 }