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https://github.com/jart/cosmopolitan.git
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d1a745c17c
* Implement __zipos_dup Makes ZiposHandle reference-counted by an `rc` field in a union with its freelist `next` pointer. The functions `__zipos_free` and `__zipos_keep` function as incref/decref for it. Adds `__zipos_postdup` to fix metadata on file descriptors after dup-like operations, and adds zipos support to `sys_dup_nt` + `sys_close_nt`. * Remove noop __zipos_postdup rc is never a zipos file because it is always a previously unused file descriptor. fd is never a zipos file because that case has been handled above by __zipos_fcntl.
100 lines
3.9 KiB
C
100 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/createfileflags.internal.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/struct/sigset.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.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/runtime/zipos.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/str/str.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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static textwindows int sys_dup_nt_impl(int oldfd, int newfd, int flags,
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int start) {
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int64_t rc, 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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__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(newfd, newfd);
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}
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}
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if (__isfdkind(oldfd, kFdZip)) {
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handle = (intptr_t)_weaken(__zipos_keep)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[oldfd].handle);
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rc = newfd;
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} else {
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if (DuplicateHandle(GetCurrentProcess(), g_fds.p[oldfd].handle,
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GetCurrentProcess(), &handle, 0, true,
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kNtDuplicateSameAccess)) {
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rc = newfd;
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} else {
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rc = __winerr();
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__releasefd(newfd);
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__fds_unlock();
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return rc;
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}
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}
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g_fds.p[newfd] = g_fds.p[oldfd];
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g_fds.p[newfd].handle = handle;
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if (flags & _O_CLOEXEC) {
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g_fds.p[newfd].flags |= _O_CLOEXEC;
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} else {
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g_fds.p[newfd].flags &= ~_O_CLOEXEC;
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}
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__fds_unlock();
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return rc;
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}
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textwindows int sys_dup_nt(int oldfd, int newfd, int flags, int start) {
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int rc;
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BLOCK_SIGNALS;
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rc = sys_dup_nt_impl(oldfd, newfd, flags, start);
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ALLOW_SIGNALS;
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return rc;
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}
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