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54 lines
2.9 KiB
54 lines
2.9 KiB
/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.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/mem/mem.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/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Implements dup(), dup2(), and dup3() for Windows NT.
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*/
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textwindows int dup$nt(int oldfd, int newfd, int flags) {
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if (!isfdkind(oldfd, kFdFile)) return ebadf();
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if (newfd == -1) {
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if ((newfd = createfd()) == -1) return -1;
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} else if (isfdindex(newfd)) {
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if (g_fds.p[newfd].kind != kFdEmpty) {
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close(newfd);
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}
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} else {
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do {
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if (growfds() == -1) return -1;
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} while (newfd >= g_fds.n);
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}
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if (DuplicateHandle(GetCurrentProcess(), g_fds.p[oldfd].handle,
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GetCurrentProcess(), &g_fds.p[newfd].handle, 0,
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flags & O_CLOEXEC, kNtDuplicateSameAccess)) {
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g_fds.p[newfd].kind = g_fds.p[oldfd].kind;
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g_fds.p[newfd].flags = flags;
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return newfd;
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} else {
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return winerr();
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}
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}
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