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4b7ba9a4c5
On UNIX if dup2(newfd) was a ZipOS file descriptor, then its resources weren't being released, and the newly created file descriptor would be mistaken for ZipOS due to its memory not being cleared. On Windows, an issue also existed relating to newfd resources not being released.
96 lines
3.8 KiB
C
96 lines
3.8 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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if (g_fds.p[newfd].kind == kFdZip) {
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_weaken(__zipos_close)(newfd);
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} else {
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sys_close_nt(newfd, newfd);
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}
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}
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}
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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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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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rc = newfd;
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} else {
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__releasefd(newfd);
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rc = __winerr();
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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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