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https://github.com/jart/cosmopolitan.git
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ad97775370
This change also introduces partial faccessat() support for zipos and makes some slight breaking changes in errno results. close() is fixed to use `EBADF` rather than `EINVAL` and we're now using `ENOTSUP` not `EOPNOTSUPP` to indicate that zipos doesn't support a system call yet
52 lines
2.7 KiB
C
52 lines
2.7 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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Duplicates file descriptor.
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*
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* The `O_CLOEXEC` flag shall be cleared from the resulting file
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* descriptor; see dup3() to preserve it.
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*
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* @param fd remains open afterwards
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* @return some arbitrary new number for fd
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* @raise EPERM if pledge() is in play without stdio
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* @raise ENOTSUP if `fd` is a zip file descriptor
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* @raise EBADF if `fd` is negative or not open
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* @asyncsignalsafe
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* @vforksafe
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*/
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int dup(int fd) {
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int rc;
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if (__isfdkind(fd, kFdZip)) {
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rc = enotsup();
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} else if (!IsWindows()) {
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rc = sys_dup(fd);
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} else {
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rc = sys_dup_nt(fd, -1, 0, -1);
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}
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STRACE("%s(%d) → %d% m", "dup", fd, rc);
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return rc;
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}
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