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https://github.com/jart/cosmopolitan.git
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6e6fc38935
Commit bc6c183 introduced a bunch of discrepancies between what files
look like in the repo and what clang-format says they should look like.
However, there were already a few discrepancies prior to that. Most of
these discrepancies seemed to be unintentional, but a few of them were
load-bearing (e.g., a #include that violated header ordering needing
something to have been #defined by a 'later' #include.)
I opted to take what I hope is a relatively smooth-brained approach: I
reverted the .clang-format change, ran clang-format on the whole repo,
reapplied the .clang-format change, reran clang-format again, and then
reverted the commit that contained the first run. Thus the full effect
of this PR should only be to apply the changed formatting rules to the
repo, and from skimming the results, this seems to be the case.
My work can be checked by applying the short, manual commits, and then
rerunning the command listed in the autogenerated commits (those whose
messages I have prefixed auto:) and seeing if your results agree.
It might be that the other diffs should be fixed at some point but I'm
leaving that aside for now.
fd '\.c(c|pp)?$' --print0| xargs -0 clang-format -i
105 lines
4.7 KiB
C
105 lines
4.7 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/internal.h"
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#include "libc/calls/state.internal.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/intrin/kprintf.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/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Duplicates file descriptor, granting it specific number.
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*
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* Unlike dup3(), the dup2() function permits oldfd and newfd to be the
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* same, in which case the only thing this function does is test if
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* oldfd is open.
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*
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* The `O_CLOEXEC` flag shall be cleared from the resulting file
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* descriptor; see dup3() to preserve it.
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*
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* One use case for duplicating file descriptors is to be able to
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* reassign an open()'d file or pipe() to the stdio of an executed
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* subprocess. On Windows, in order for this to work, the subprocess
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* needs to be a Cosmopolitan program that has socket() linked.
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*
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* Only small programs should duplicate sockets. That's because this
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* implementation uses DuplicateHandle() on Windows, which Microsoft
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* says might cause its resources to leak internally. Thus it likely
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* isn't a good idea to design a server that does it a lot and lives
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* a long time, without contributing a patch to this implementation.
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*
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* @param oldfd isn't closed afterwards
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* @param newfd if already assigned, is silently closed beforehand;
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* unless it's equal to oldfd, in which case dup2() is a no-op
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* @return new file descriptor, or -1 w/ errno
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* @raise EPERM if pledge() is in play without stdio
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* @raise EMFILE if `RLIMIT_NOFILE` has been reached
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* @raise ENOTSUP if `oldfd` is on zip file system
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* @raise EINTR if a signal handler was called
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* @raise EBADF is `newfd` negative or too big
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* @raise EBADF is `oldfd` isn't open
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* @asyncsignalsafe
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* @vforksafe
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*/
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int dup2(int oldfd, int newfd) {
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int rc;
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// helps guarantee stderr log gets duplicated before user closes
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if (_weaken(kloghandle))
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_weaken(kloghandle)();
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#ifdef __aarch64__
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if (oldfd == newfd) {
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// linux aarch64 defines dup3() but not dup2(), which wasn't such a
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// great decision, since the two syscalls don't behave the same way
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if (!(rc = read(oldfd, 0, 0)))
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rc = oldfd;
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} else
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#endif
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if (!IsWindows()) {
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if (__isfdkind(oldfd, kFdZip) || __isfdkind(newfd, kFdZip)) {
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if (__vforked) {
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return enotsup();
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}
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rc = sys_dup2(oldfd, newfd, 0);
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if (rc != -1) {
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_weaken(__zipos_postdup)(oldfd, newfd);
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}
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} else {
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rc = sys_dup2(oldfd, newfd, 0);
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}
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} else if (newfd < 0) {
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rc = ebadf();
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} else if (oldfd == newfd) {
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if (__isfdopen(oldfd)) {
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rc = newfd;
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} else {
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rc = ebadf();
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}
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} else {
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rc = sys_dup_nt(oldfd, newfd, 0, -1);
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}
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STRACE("dup2(%d, %d) → %d% m", oldfd, newfd, rc);
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return rc;
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}
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