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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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fax
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faxd
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UUCPLock.h
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1994-08-01
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/* $Header: /usr/people/sam/fax/faxd/RCS/UUCPLock.h,v 1.11 1994/03/31 21:52:30 sam Rel $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994 Sam Leffler
* Copyright (c) 1991, 1992, 1993, 1994 Silicon Graphics, Inc.
*
* 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
fxBool locked; // is lock currently held
static uid_t UUCPuid;
static gid_t UUCPgid;
static void setupIDs();
static time_t lockTimeout;
fxBool create(); // create lock file
fxBool isNewer(time_t age); // is lock file newer than age
fxBool ownerExists(int fd); // does owning process exist
protected:
UUCPLock(const char* device); // must use derived class
virtual fxBool writeData(int fd) = 0;
virtual fxBool readData(int fd, pid_t& pid) = 0;
public:
virtual ~UUCPLock();
static uid_t getUUCPUid();
static gid_t getUUCPGid();
static void setLockTimeout(time_t);
fxBool lock(); // lock device
void unlock(); // unlock device
fxBool check(); // check if device is locked
};
/*
* Lock files with ascii contents (System V style).
*/
class AsciiUUCPLock : public UUCPLock {
private:
fxStr data; // data to write record in lock file
fxBool writeData(int fd);
fxBool readData(int fd, pid_t& pid);
public:
AsciiUUCPLock(const char* device);
~AsciiUUCPLock();
};
/*
* Lock files with binary contents (BSD style).
*/
class BinaryUUCPLock : public UUCPLock {
private:
int data; // data to write record in lock file
fxBool writeData(int fd);
fxBool readData(int fd, pid_t& pid);
public:
BinaryUUCPLock(const char* device);
~BinaryUUCPLock();
};
extern UUCPLock* OSnewUUCPLock(const char* device);
#endif /* _UUCPLOCK_ */