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1f2a5a8fc1
The ShowCrashReports() feature for aarch64 should work even better than the x86 crash reports. Thanks to the benefit of hindsight these reports should be rock solid reliable and beautiful to read. This change also improves the syscall polyfills for aarch64. Some of the sys_foo() functions have been removed, usually because they're legacy or downright footguns not worth building.
75 lines
3.6 KiB
C
75 lines
3.6 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/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/strace.internal.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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* 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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* 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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* @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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if (__isfdkind(oldfd, kFdZip)) {
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rc = enotsup();
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#ifdef __aarch64__
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} else 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))) rc = oldfd;
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#endif
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} else if (!IsWindows()) {
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rc = sys_dup2(oldfd, newfd, 0);
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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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