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

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As per POSIX-2024.

Fixes #19476.
This commit is contained in:
Augustin Cavalier
2025-03-12 22:01:57 -04:00
parent 0d73795fc9
commit d68fa86ee1
1 changed files with 3 additions and 1 deletions
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src/system/libroot/posix/unistd/dup.c
+3 -1
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@@ -22,12 +22,14 @@ dup(int fd)
int int
dup2(int oldFD, int newFD) dup2(int oldFD, int newFD)
{ {
return dup3(oldFD, newFD, 0); RETURN_AND_SET_ERRNO(_kern_dup2(oldFD, newFD, 0));
} }
int int
dup3(int oldFD, int newFD, int flags) dup3(int oldFD, int newFD, int flags)
{ {
if (oldFD == newFD)
RETURN_AND_SET_ERRNO(EINVAL);
RETURN_AND_SET_ERRNO(_kern_dup2(oldFD, newFD, flags)); RETURN_AND_SET_ERRNO(_kern_dup2(oldFD, newFD, flags));
} }