mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
66 lines
2.9 KiB
C
66 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et 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/calls/internal.h"
|
|
#include "libc/intrin/fds.h"
|
|
#include "libc/calls/syscall-nt.internal.h"
|
|
#include "libc/calls/syscall_support-nt.internal.h"
|
|
#include "libc/nt/enum/filelockflags.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/struct/byhandlefileinformation.h"
|
|
#include "libc/nt/struct/overlapped.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
#define _LOCK_SH 0
|
|
#define _LOCK_EX kNtLockfileExclusiveLock
|
|
#define _LOCK_NB kNtLockfileFailImmediately
|
|
#define _LOCK_UN 8
|
|
|
|
textwindows int sys_flock_nt(int fd, int op) {
|
|
int64_t h;
|
|
struct NtByHandleFileInformation info;
|
|
if (!__isfdkind(fd, kFdFile))
|
|
return ebadf();
|
|
h = g_fds.p[fd].handle;
|
|
struct NtOverlapped ov = {.hEvent = h};
|
|
|
|
if (!GetFileInformationByHandle(h, &info)) {
|
|
return __winerr();
|
|
}
|
|
|
|
if (op & _LOCK_UN) {
|
|
if (op & ~_LOCK_UN) {
|
|
return einval();
|
|
}
|
|
if (UnlockFileEx(h, 0, info.nFileSizeLow, info.nFileSizeHigh, &ov)) {
|
|
return 0;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (op & ~(_LOCK_SH | _LOCK_EX | _LOCK_NB)) {
|
|
return einval();
|
|
}
|
|
|
|
if (LockFileEx(h, op, 0, info.nFileSizeLow, info.nFileSizeHigh, &ov)) {
|
|
return 0;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|