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