mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
18bb5888e1
- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE
68 lines
2.9 KiB
C
68 lines
2.9 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/assert.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/cosmo.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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#define F_DUP2FD 10
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#define F_DUP2FD_CLOEXEC 18
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static struct Dup3 {
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_Atomic(uint32_t) once;
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bool demodernize;
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} g_dup3;
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static void sys_dup3_test(void) {
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int e = errno;
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__sys_dup3(-1, -1, 0);
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if ((g_dup3.demodernize = errno == ENOSYS)) {
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STRACE("demodernizing %s() due to %s", "dup3", "ENOSYS");
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}
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errno = e;
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}
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int32_t sys_dup3(int32_t oldfd, int32_t newfd, int flags) {
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int how;
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unassert(oldfd >= 0);
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unassert(newfd >= 0);
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unassert(!(flags & ~O_CLOEXEC));
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if (IsFreebsd()) {
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if (flags & O_CLOEXEC) {
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how = F_DUP2FD_CLOEXEC;
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} else {
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how = F_DUP2FD;
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}
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return __sys_fcntl(oldfd, how, newfd);
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}
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cosmo_once(&g_dup3.once, sys_dup3_test);
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if (!g_dup3.demodernize) {
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return __sys_dup3(oldfd, newfd, flags);
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} else {
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return __fixupnewfd(sys_dup2(oldfd, newfd, 0), flags);
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}
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}
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