You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
1.7 KiB
63 lines
1.7 KiB
4 months ago
|
//===-- LockFilePosix.cpp -------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "lldb/Host/posix/LockFilePosix.h"
|
||
|
|
|
||
|
|
#include "llvm/Support/Errno.h"
|
||
|
|
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
using namespace lldb;
|
||
|
|
using namespace lldb_private;
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
Status fileLock(int fd, int cmd, int lock_type, const uint64_t start,
|
||
|
|
const uint64_t len) {
|
||
|
|
struct flock fl;
|
||
|
|
|
||
|
|
fl.l_type = lock_type;
|
||
|
|
fl.l_whence = SEEK_SET;
|
||
|
|
fl.l_start = start;
|
||
|
|
fl.l_len = len;
|
||
|
|
fl.l_pid = ::getpid();
|
||
|
|
|
||
|
|
Status error;
|
||
|
|
if (llvm::sys::RetryAfterSignal(-1, ::fcntl, fd, cmd, &fl) == -1)
|
||
|
|
error.SetErrorToErrno();
|
||
|
|
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
|
||
|
|
|
||
|
|
LockFilePosix::~LockFilePosix() { Unlock(); }
|
||
|
|
|
||
|
|
Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
|
||
|
|
return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
|
||
|
|
return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
|
||
|
|
return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
|
||
|
|
return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
Status LockFilePosix::DoUnlock() {
|
||
|
|
return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);
|
||
|
|
}
|