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posix: access/accessZ/faccessat/faccessatZ can return AccessDenied or PermissionDenied

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`EACCES` is returned if the file mode bit (i.e., user/group/other rwx
bits) disallow access.  `EPERM` is returned if something else denies
access (immutable bit, SELinux, capabilities, etc).  This somewhat subtle
no-access distinction is part of POSIX.  For now map both to
`error.PermissionDenied` to keep the error signature unchanged.  See
duopoly.

This PR is effecitvely an update/simplification of PR #19193.

Tested locally with an immutable file.

Fixes #22733 and #19162.
This commit is contained in:
Pat Tullmann
2025-02-18 17:04:19 -08:00
committed by Alex Rønne Petersen
parent a8d3760c5b
commit 8d9bb97461
1 changed files with 2 additions and 0 deletions
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lib/std/posix.zig
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@@ -4914,6 +4914,7 @@ pub fn accessZ(path: [*:0]const u8, mode: u32) AccessError!void {
switch (errno(system.access(path, mode))) {
.SUCCESS => return,
.ACCES => return error.PermissionDenied,
.PERM => return error.PermissionDenied,
.ROFS => return error.ReadOnlyFileSystem,
.LOOP => return error.SymLinkLoop,
.TXTBSY => return error.FileBusy,
@@ -4999,6 +5000,7 @@ pub fn faccessatZ(dirfd: fd_t, path: [*:0]const u8, mode: u32, flags: u32) Acces
switch (errno(system.faccessat(dirfd, path, mode, flags))) {
.SUCCESS => return,
.ACCES => return error.PermissionDenied,
.PERM => return error.PermissionDenied,
.ROFS => return error.ReadOnlyFileSystem,
.LOOP => return error.SymLinkLoop,
.TXTBSY => return error.FileBusy,