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https://github.com/jart/cosmopolitan.git
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a6baba1b07
The WIN32 CreateProcess() function does not require an .exe or .com suffix in order to spawn an executable. Now that we have Cosmo bash we're no longer so dependent on the cmd.exe prompt.
80 lines
3.8 KiB
C
80 lines
3.8 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 2021 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/blockcancel.internal.h"
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#include "libc/calls/calls.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/runtime/zipos.internal.h"
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#include "libc/sysv/errfuns.h"
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int sys_fchmodat_linux(int, const char *, unsigned, int);
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int sys_fchmodat2(int, const char *, unsigned, int);
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/**
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* Changes permissions on file, e.g.:
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*
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "foo/bar.txt", 0644));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "o/default/program", 0755));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "privatefolder/", 0700));
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*
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* @param path must exist
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* @param mode contains octal flags (base 8)
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* @param flags can have `AT_SYMLINK_NOFOLLOW`
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* @raise EROFS if `dirfd` or `path` use zip file system
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* @raise EOPNOTSUP on Linux if `path` is a symbolic link, `AT_SYMLINK_NOFOLLOW`
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* is set in `flags`, and filesystem does not support setting the mode of
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* symbolic links.
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* @errors ENOENT, ENOTDIR, ENOSYS
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* @asyncsignalsafe
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* @see fchmod()
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*/
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int fchmodat(int dirfd, const char *path, uint32_t mode, 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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rc = erofs();
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} else if (!IsWindows()) {
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if (IsLinux() && flags) {
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int serrno = errno;
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rc = sys_fchmodat2(dirfd, path, mode, flags);
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if (rc == -1 && errno == ENOSYS) {
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errno = serrno;
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BLOCK_CANCELATION;
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rc = sys_fchmodat_linux(dirfd, path, mode, flags);
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ALLOW_CANCELATION;
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}
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} else {
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rc = sys_fchmodat(dirfd, path, mode, flags);
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}
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} else {
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rc = sys_fchmodat_nt(dirfd, path, mode, flags);
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}
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STRACE("fchmodat(%s, %#s, %#o, %d) → %d% m", DescribeDirfd(dirfd), path, mode,
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flags, rc);
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return rc;
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}
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