cosmopolitan/libc/calls/dup-nt.c
Justine Tunney c9fecf3a55
Make improvements
- You can now run `make -j8 toolchain` on Windows
- You can now run `make -j` on MacOS ARM64 and BSD OSes
- You can now use our Emacs dev environment on MacOS/Windows
- Fix bug where the x16 register was being corrupted by --ftrace
- The programs under build/bootstrap/ are updated as fat binaries
- The Makefile now explains how to download cosmocc-0.0.12 toolchain
- The build scripts under bin/ now support "cosmo" branded toolchains
- stat() now goes faster on Windows (shaves 100ms off `make` latency)
- Code cleanup and added review on the Windows signal checking code
- posix_spawnattr_setrlimit() now works around MacOS ARM64 bugs
- Landlock Make now favors posix_spawn() on non-Linux/OpenBSD
- posix_spawn() now has better --strace logging on Windows
- fstatat() can now avoid EACCES in more cases on Windows
- fchmod() can now change the readonly bit on Windows
2023-10-15 16:45:00 -07:00

90 lines
3.6 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/createfileflags.internal.h"
#include "libc/calls/internal.h"
#include "libc/calls/state.internal.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/errno.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sock/internal.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
// Implements dup(), dup2(), dup3(), and F_DUPFD for Windows.
static textwindows int sys_dup_nt_impl(int oldfd, int newfd, int flags,
int start) {
int64_t rc, handle;
unassert(!(flags & ~O_CLOEXEC));
__fds_lock();
if (!__isfdopen(oldfd) || newfd < -1) {
__fds_unlock();
return ebadf();
}
// allocate a new file descriptor
if (newfd == -1) {
if ((newfd = __reservefd_unlocked(start)) == -1) {
__fds_unlock();
return -1;
}
} else {
if (__ensurefds_unlocked(newfd) == -1) {
__fds_unlock();
return -1;
}
if (g_fds.p[newfd].kind) {
sys_close_nt(newfd, newfd);
}
}
if (DuplicateHandle(GetCurrentProcess(), g_fds.p[oldfd].handle,
GetCurrentProcess(), &handle, 0, true,
kNtDuplicateSameAccess)) {
g_fds.p[newfd] = g_fds.p[oldfd];
g_fds.p[newfd].handle = handle;
if (flags & _O_CLOEXEC) {
g_fds.p[newfd].flags |= _O_CLOEXEC;
} else {
g_fds.p[newfd].flags &= ~_O_CLOEXEC;
}
rc = newfd;
} else {
__releasefd(newfd);
rc = __winerr();
}
__fds_unlock();
return rc;
}
textwindows int sys_dup_nt(int oldfd, int newfd, int flags, int start) {
int rc;
BLOCK_SIGNALS;
rc = sys_dup_nt_impl(oldfd, newfd, flags, start);
ALLOW_SIGNALS;
return rc;
}