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https://github.com/jart/cosmopolitan.git
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e11fa30791
This way complex runtime features (e.g. ftrace, symbol tables) can always yoink zipos support. This is important now that apelink.com automates embedding symbol tables for multiple cpus.
72 lines
3.4 KiB
C
72 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/runtime/zipos.internal.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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*/
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int unlinkat(int dirfd, const char *path, int flags) {
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int rc;
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if (IsAsan() && !__asan_is_valid_str(path)) {
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rc = efault();
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} else if (_weaken(__zipos_notat) &&
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(rc = __zipos_notat(dirfd, path)) == -1) {
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STRACE("zipos unlinkat not supported yet");
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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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if (!IsLinux() && rc == -1 && !flags && errno == EPERM) {
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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 = EPERM;
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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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