mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +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
97 lines
3.9 KiB
C
97 lines
3.9 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/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/state.internal.h"
|
|
#include "libc/calls/syscall_support-nt.internal.h"
|
|
#include "libc/intrin/weaken.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Implements dup(), dup2(), dup3(), and F_DUPFD for Windows.
|
|
*/
|
|
textwindows int sys_dup_nt(int oldfd, int newfd, int flags, int start) {
|
|
int64_t rc, proc, handle;
|
|
_unassert(oldfd >= 0);
|
|
_unassert(newfd >= -1);
|
|
_unassert(!(flags & ~O_CLOEXEC));
|
|
|
|
__fds_lock();
|
|
|
|
if (oldfd >= g_fds.n ||
|
|
(g_fds.p[oldfd].kind != kFdFile && g_fds.p[oldfd].kind != kFdSocket &&
|
|
g_fds.p[oldfd].kind != kFdConsole)) {
|
|
__fds_unlock();
|
|
return ebadf();
|
|
}
|
|
|
|
// allocate a new file descriptor
|
|
for (;;) {
|
|
if (newfd == -1) {
|
|
if ((newfd = __reservefd_unlocked(start)) == -1) {
|
|
__fds_unlock();
|
|
return -1;
|
|
}
|
|
break;
|
|
} else {
|
|
if (__ensurefds_unlocked(newfd) == -1) {
|
|
__fds_unlock();
|
|
return -1;
|
|
}
|
|
if (g_fds.p[newfd].kind) {
|
|
__fds_unlock();
|
|
close(newfd);
|
|
__fds_lock();
|
|
}
|
|
if (!g_fds.p[newfd].kind) {
|
|
g_fds.p[newfd].kind = kFdReserved;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
handle = g_fds.p[oldfd].handle;
|
|
proc = GetCurrentProcess();
|
|
|
|
if (DuplicateHandle(proc, handle, proc, &g_fds.p[newfd].handle, 0, true,
|
|
kNtDuplicateSameAccess)) {
|
|
g_fds.p[newfd].kind = g_fds.p[oldfd].kind;
|
|
g_fds.p[newfd].mode = g_fds.p[oldfd].mode;
|
|
g_fds.p[newfd].flags = g_fds.p[oldfd].flags & ~O_CLOEXEC;
|
|
if (flags & O_CLOEXEC) g_fds.p[newfd].flags |= O_CLOEXEC;
|
|
if (g_fds.p[oldfd].kind == kFdSocket && _weaken(_dupsockfd)) {
|
|
g_fds.p[newfd].extra =
|
|
(intptr_t)_weaken(_dupsockfd)((struct SockFd *)g_fds.p[oldfd].extra);
|
|
} else {
|
|
g_fds.p[newfd].extra = g_fds.p[oldfd].extra;
|
|
}
|
|
rc = newfd;
|
|
} else {
|
|
__releasefd_unlocked(newfd);
|
|
rc = __winerr();
|
|
}
|
|
|
|
__fds_unlock();
|
|
return rc;
|
|
}
|