mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
3f49889841
- Fix preadv() and pwritev() for old distros - Introduce _npassert() and _unassert() macros - Prove that file locks work properly on Windows - Support fcntl(F_DUPFD_CLOEXEC) on more systems
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 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/calls/syscall_support-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
#define F_DUP2FD 10
|
|
#define F_DUP2FD_CLOEXEC 18
|
|
|
|
static struct Dup3 {
|
|
pthread_once_t once;
|
|
bool demodernize;
|
|
} g_dup3;
|
|
|
|
static void sys_dup3_test(void) {
|
|
int e = errno;
|
|
__sys_dup3(-1, -1, 0);
|
|
if ((g_dup3.demodernize = errno == ENOSYS)) {
|
|
STRACE("demodernizing %s() due to %s", "dup3", "ENOSYS");
|
|
}
|
|
errno = e;
|
|
}
|
|
|
|
int32_t sys_dup3(int32_t oldfd, int32_t newfd, int flags) {
|
|
int how;
|
|
_unassert(oldfd >= 0);
|
|
_unassert(newfd >= 0);
|
|
_unassert(!(flags & ~O_CLOEXEC));
|
|
|
|
if (IsFreebsd()) {
|
|
if (flags & O_CLOEXEC) {
|
|
how = F_DUP2FD_CLOEXEC;
|
|
} else {
|
|
how = F_DUP2FD;
|
|
}
|
|
return __sys_fcntl(oldfd, how, newfd);
|
|
}
|
|
|
|
pthread_once(&g_dup3.once, sys_dup3_test);
|
|
|
|
if (!g_dup3.demodernize) {
|
|
return __sys_dup3(oldfd, newfd, flags);
|
|
} else {
|
|
return __fixupnewfd(sys_dup2(oldfd, newfd), flags);
|
|
}
|
|
}
|