UUCPLock.h
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- /* $Id: UUCPLock.h,v 1.1.1.1 2005/11/11 21:32:02 faxguy Exp $ */
- /*
- * Copyright (c) 1990-1996 Sam Leffler
- * Copyright (c) 1991-1996 Silicon Graphics, Inc.
- * HylaFAX is a trademark of Silicon Graphics
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
- #ifndef _UUCPLOCK_
- #define _UUCPLOCK_
- /*
- * UUCP Locking Support.
- */
- #include <unistd.h>
- #include "Str.h"
- class UUCPLock {
- private:
- fxStr file; // lock file pathname
- mode_t mode; // lock file mode
- bool locked; // is lock currently held
- static uid_t UUCPuid;
- static gid_t UUCPgid;
- static void setupIDs();
- static time_t lockTimeout;
- bool create(); // create lock file
- bool isNewer(time_t age); // is lock file newer than age
- bool ownerExists(int fd); // does owning process exist
- protected:
- UUCPLock(const fxStr& pathname, mode_t mode);
- virtual void setPID(pid_t) = 0;
- virtual bool writeData(int fd) = 0;
- virtual bool readData(int fd, pid_t& pid) = 0;
- public:
- virtual ~UUCPLock();
- static uid_t getUUCPUid();
- static gid_t getUUCPGid();
- static void setLockTimeout(time_t);
- static UUCPLock* newLock( // public interface to create a lock
- const char* type, // lock file type
- const fxStr& prefix, // lock file directory+prefix
- const fxStr& device, // device pathname
- mode_t mode); // file creation mode
- bool isLocked() const; // device is locked
- bool lock(); // lock device
- void unlock(); // unlock device
- bool check(); // check if lock exists
- bool setOwner(pid_t); // force process owner identity
- };
- inline bool UUCPLock::isLocked() const { return locked; }
- #endif /* _UUCPLOCK_ */