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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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