97841dad2b
Convert the StringToInt helper into a StringToLong helper with a 'long' result type. This will make the helper more useful to other callers that want to use strtol. While at it, also check errno after calling strtol in case the conversion fails with a range error.
103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2014 Ruslan Baratov
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#include "cmFileLock.h"
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#include <errno.h> // errno
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#include <stdio.h> // SEEK_SET
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#include <fcntl.h>
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#include "cmSystemTools.h"
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cmFileLock::cmFileLock(): File(-1)
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{
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}
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cmFileLockResult cmFileLock::Release()
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{
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if (this->Filename.empty())
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{
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return cmFileLockResult::MakeOk();
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}
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const int lockResult = this->LockFile(F_SETLK, F_UNLCK);
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this->Filename = "";
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if (lockResult == 0)
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{
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return cmFileLockResult::MakeOk();
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}
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else
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{
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return cmFileLockResult::MakeSystem();
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}
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}
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cmFileLockResult cmFileLock::OpenFile()
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{
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this->File = ::open(this->Filename.c_str(), O_RDWR);
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if (this->File == -1)
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{
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return cmFileLockResult::MakeSystem();
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}
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else
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{
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return cmFileLockResult::MakeOk();
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}
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}
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cmFileLockResult cmFileLock::LockWithoutTimeout()
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{
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if (this->LockFile(F_SETLKW, F_WRLCK) == -1)
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{
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return cmFileLockResult::MakeSystem();
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}
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else
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{
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return cmFileLockResult::MakeOk();
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}
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}
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cmFileLockResult cmFileLock::LockWithTimeout(unsigned long seconds)
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{
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while (true)
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{
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if (this->LockFile(F_SETLK, F_WRLCK) == -1)
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{
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if (errno != EACCES && errno != EAGAIN)
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{
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return cmFileLockResult::MakeSystem();
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}
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}
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else
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{
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return cmFileLockResult::MakeOk();
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}
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if (seconds == 0)
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{
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return cmFileLockResult::MakeTimeout();
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}
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--seconds;
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cmSystemTools::Delay(1000);
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}
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}
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int cmFileLock::LockFile(int cmd, int type)
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{
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struct ::flock lock;
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lock.l_start = 0;
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lock.l_len = 0; // lock all bytes
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lock.l_pid = 0; // unused (for F_GETLK only)
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lock.l_type = static_cast<short>(type); // exclusive lock
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lock.l_whence = SEEK_SET;
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return ::fcntl(this->File, cmd, &lock);
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}
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