mirror of
https://github.com/jart/cosmopolitan.git
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70 lines
3.3 KiB
C
70 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Deletes inode and maybe the file too.
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*
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* This may be used to delete files and directories and symlinks.
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*
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* @param dirfd is normally AT_FDCWD but if it's an open directory and
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* path is relative, then path becomes relative to dirfd
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* @param path is the thing to delete
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* @param flags can have AT_REMOVEDIR
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* @return 0 on success, or -1 w/ errno
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* @raise EROFS if either path is under /zip/...
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*/
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int unlinkat(int dirfd, const char *path, int flags) {
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int rc;
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if (_weaken(__zipos_notat) && (rc = __zipos_notat(dirfd, path)) == -1) {
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rc = erofs();
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} else if (!IsWindows()) {
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rc = sys_unlinkat(dirfd, path, flags);
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} else {
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rc = sys_unlinkat_nt(dirfd, path, flags);
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}
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// POSIX.1 says unlink(directory) raises EPERM but on Linux
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// it always raises EISDIR, which is so much less ambiguous
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int e = errno;
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if (!IsLinux() && rc == -1 && !flags && (e == EPERM || e == EACCES)) {
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struct stat st;
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if (!fstatat(dirfd, path, &st, 0) && S_ISDIR(st.st_mode)) {
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errno = EISDIR;
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} else {
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errno = e;
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}
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}
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STRACE("unlinkat(%s, %#s, %#b) → %d% m", DescribeDirfd(dirfd), path, flags,
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rc);
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return rc;
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}
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