mirror of
https://github.com/jart/cosmopolitan.git
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56 lines
2.9 KiB
C
56 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/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 sys_dup_nt(int oldfd, int newfd, int flags) {
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int64_t proc;
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if (oldfd < 0) return einval();
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if (oldfd >= g_fds.n ||
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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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return ebadf();
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}
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if (newfd == -1) {
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if ((newfd = __reservefd()) == -1) return -1;
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} else {
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if (__ensurefds(newfd) == -1) return -1;
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if (g_fds.p[newfd].kind) close(newfd);
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g_fds.p[newfd].kind = kFdReserved;
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}
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proc = GetCurrentProcess();
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if (DuplicateHandle(proc, g_fds.p[oldfd].handle, proc, &g_fds.p[newfd].handle,
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0, true, 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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__releasefd(newfd);
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return __winerr();
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}
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}
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