mirror of
https://github.com/jart/cosmopolitan.git
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90 lines
3.9 KiB
C
90 lines
3.9 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/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_support-nt.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/sock/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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// Implements dup(), dup2(), dup3(), and F_DUPFD for Windows.
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textwindows int sys_dup_nt(int oldfd, int newfd, int flags, int start) {
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int64_t rc, proc, handle;
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unassert(!(flags & ~O_CLOEXEC));
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__fds_lock();
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if (!__isfdopen(oldfd) || newfd < -1 ||
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(g_fds.p[oldfd].kind != kFdFile && g_fds.p[oldfd].kind != kFdSocket &&
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g_fds.p[oldfd].kind != kFdConsole)) {
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__fds_unlock();
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return ebadf();
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}
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// allocate a new file descriptor
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if (newfd == -1) {
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if ((newfd = __reservefd_unlocked(start)) == -1) {
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__fds_unlock();
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return -1;
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}
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} else {
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if (__ensurefds_unlocked(newfd) == -1) {
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__fds_unlock();
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return -1;
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}
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if (g_fds.p[newfd].kind) {
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sys_close_nt(g_fds.p + newfd, newfd);
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bzero(g_fds.p + newfd, sizeof(*g_fds.p));
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}
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}
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handle = g_fds.p[oldfd].handle;
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proc = GetCurrentProcess();
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if (DuplicateHandle(proc, handle, proc, &g_fds.p[newfd].handle, 0, false,
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kNtDuplicateSameAccess)) {
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g_fds.p[newfd].kind = g_fds.p[oldfd].kind;
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g_fds.p[newfd].mode = g_fds.p[oldfd].mode;
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g_fds.p[newfd].flags = g_fds.p[oldfd].flags & ~O_CLOEXEC;
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if (flags & O_CLOEXEC) g_fds.p[newfd].flags |= O_CLOEXEC;
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if (g_fds.p[oldfd].kind == kFdSocket && _weaken(_dupsockfd)) {
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g_fds.p[newfd].extra =
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(intptr_t)_weaken(_dupsockfd)((struct SockFd *)g_fds.p[oldfd].extra);
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} else if (g_fds.p[oldfd].kind == kFdConsole) {
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unassert(DuplicateHandle(proc, g_fds.p[oldfd].extra, proc,
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&g_fds.p[newfd].extra, 0, false,
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kNtDuplicateSameAccess));
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} else {
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g_fds.p[newfd].extra = g_fds.p[oldfd].extra;
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}
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rc = newfd;
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} else {
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__releasefd(newfd);
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rc = __winerr();
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}
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__fds_unlock();
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return rc;
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}
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