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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.
63 lines
3 KiB
C
63 lines
3 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 2021 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/createfileflags.internal.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/runtime/zipos.internal.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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static int __zipos_dupfd(int fd, int cmd, int start) {
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int rc;
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if (start < 0) return einval();
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if (IsWindows()) {
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return sys_dup_nt(fd, -1, (cmd == F_DUPFD_CLOEXEC ? _O_CLOEXEC : 0),
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start);
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}
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rc = sys_fcntl(fd, cmd, start, __sys_fcntl);
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if (rc != -1) {
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__zipos_postdup(fd, rc);
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}
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return rc;
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}
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int __zipos_fcntl(int fd, int cmd, uintptr_t arg) {
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if (cmd == F_GETFD) {
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if (g_fds.p[fd].flags & O_CLOEXEC) {
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return FD_CLOEXEC;
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} else {
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return 0;
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}
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} else if (cmd == F_SETFD) {
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if (arg & FD_CLOEXEC) {
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g_fds.p[fd].flags |= O_CLOEXEC;
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return FD_CLOEXEC;
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} else {
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g_fds.p[fd].flags &= ~O_CLOEXEC;
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return 0;
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}
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} else if (cmd == F_DUPFD || cmd == F_DUPFD_CLOEXEC) {
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return __zipos_dupfd(fd, cmd, arg);
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} else {
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return einval();
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}
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}
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