103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
|
/*============================================================================
|
||
|
|
CMake - Cross Platform Makefile Generator
|
||
|
|
Copyright 2014 Ruslan Baratov
|
||
|
|
|
||
|
|
Distributed under the OSI-approved BSD License (the "License");
|
||
|
|
see accompanying file Copyright.txt for details.
|
||
|
|
|
||
|
|
This software is distributed WITHOUT ANY WARRANTY; without even the
|
||
|
|
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||
|
|
See the License for more information.
|
||
|
|
============================================================================*/
|
||
|
|
|
||
|
|
#include "cmFileLock.h"
|
||
|
|
|
||
|
|
#include <errno.h> // errno
|
||
|
|
#include <stdio.h> // SEEK_SET
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include "cmSystemTools.h"
|
||
|
|
|
||
|
|
cmFileLock::cmFileLock(): File(-1)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
cmFileLockResult cmFileLock::Release()
|
||
|
|
{
|
||
|
|
if (this->Filename.empty())
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeOk();
|
||
|
|
}
|
||
|
|
const int lockResult = this->LockFile(F_SETLK, F_UNLCK);
|
||
|
|
|
||
|
|
this->Filename = "";
|
||
|
|
|
||
|
|
if (lockResult == 0)
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeOk();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeSystem();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cmFileLockResult cmFileLock::OpenFile()
|
||
|
|
{
|
||
|
|
this->File = ::open(this->Filename.c_str(), O_RDWR);
|
||
|
|
if (this->File == -1)
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeSystem();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeOk();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cmFileLockResult cmFileLock::LockWithoutTimeout()
|
||
|
|
{
|
||
|
|
if (this->LockFile(F_SETLKW, F_WRLCK) == -1)
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeSystem();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeOk();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cmFileLockResult cmFileLock::LockWithTimeout(unsigned seconds)
|
||
|
|
{
|
||
|
|
while (true)
|
||
|
|
{
|
||
|
|
if (this->LockFile(F_SETLK, F_WRLCK) == -1)
|
||
|
|
{
|
||
|
|
if (errno != EACCES && errno != EAGAIN)
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeSystem();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeOk();
|
||
|
|
}
|
||
|
|
if (seconds == 0)
|
||
|
|
{
|
||
|
|
return cmFileLockResult::MakeTimeout();
|
||
|
|
}
|
||
|
|
--seconds;
|
||
|
|
cmSystemTools::Delay(1000);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int cmFileLock::LockFile(int cmd, int type)
|
||
|
|
{
|
||
|
|
struct ::flock lock;
|
||
|
|
lock.l_start = 0;
|
||
|
|
lock.l_len = 0; // lock all bytes
|
||
|
|
lock.l_pid = 0; // unused (for F_GETLK only)
|
||
|
|
lock.l_type = static_cast<short>(type); // exclusive lock
|
||
|
|
lock.l_whence = SEEK_SET;
|
||
|
|
return ::fcntl(this->File, cmd, &lock);
|
||
|
|
}
|