1 | //===-- LockFilePosix.cpp -------------------------------------------------===// |
---|---|
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #include "lldb/Host/posix/LockFilePosix.h" |
10 | |
11 | #include "llvm/Support/Errno.h" |
12 | |
13 | #include <fcntl.h> |
14 | #include <unistd.h> |
15 | |
16 | using namespace lldb; |
17 | using namespace lldb_private; |
18 | |
19 | static Status fileLock(int fd, int cmd, int lock_type, const uint64_t start, |
20 | const uint64_t len) { |
21 | struct flock fl; |
22 | |
23 | fl.l_type = lock_type; |
24 | fl.l_whence = SEEK_SET; |
25 | fl.l_start = start; |
26 | fl.l_len = len; |
27 | fl.l_pid = ::getpid(); |
28 | |
29 | if (llvm::sys::RetryAfterSignal(Fail: -1, F&: ::fcntl, As: fd, As: cmd, As: &fl) == -1) |
30 | return Status::FromErrno(); |
31 | |
32 | return Status(); |
33 | } |
34 | |
35 | LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {} |
36 | |
37 | LockFilePosix::~LockFilePosix() { Unlock(); } |
38 | |
39 | Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) { |
40 | return fileLock(fd: m_fd, F_SETLKW, F_WRLCK, start, len); |
41 | } |
42 | |
43 | Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) { |
44 | return fileLock(fd: m_fd, F_SETLK, F_WRLCK, start, len); |
45 | } |
46 | |
47 | Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) { |
48 | return fileLock(fd: m_fd, F_SETLKW, F_RDLCK, start, len); |
49 | } |
50 | |
51 | Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) { |
52 | return fileLock(fd: m_fd, F_SETLK, F_RDLCK, start, len); |
53 | } |
54 | |
55 | Status LockFilePosix::DoUnlock() { |
56 | return fileLock(fd: m_fd, F_SETLK, F_UNLCK, start: m_start, len: m_len); |
57 | } |
58 |