114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/*
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BeLock.c - implementation of Fido-style message bases lock library.
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Copyright 2001-2003 Siarzhuk Zharski, imker@gmx.li
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. All advertising materials mentioning features or use of this software
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must display the following acknowledgement:
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4. Neither the names of the authors nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "be_lock.h"
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static const char rcsid[]="$Id$";
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static status_t look_for_port(int file_handle, bool b_create, port_id *port_id_ptr)
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{
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status_t status = B_OK;
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struct stat st = {0};
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char name[B_OS_NAME_LENGTH] = {0};
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if(fstat(file_handle, &st))
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return B_IO_ERROR;
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sprintf(name, "FidoLock:%08X:%08X", st.st_dev, st.st_ino);
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*port_id_ptr = find_port(name);
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if(*port_id_ptr == B_NAME_NOT_FOUND)
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{
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if(b_create)
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{
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*port_id_ptr = create_port(1, name);
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if(*port_id_ptr == B_BAD_VALUE || *port_id_ptr == B_NO_MORE_PORTS)
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status = *port_id_ptr;
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}
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else
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status = B_NAME_NOT_FOUND;
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}
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else // already have such lock ...
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status = B_BUSY;
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return status;
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}
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status_t beos_lock(int file_handle)
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{
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port_id pid = 0;
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return look_for_port(file_handle, true, &pid);
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}
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status_t beos_unlock(int file_handle)
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{
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port_id pid = 0;
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status_t status = look_for_port(file_handle, false, &pid);
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if(status == B_BUSY)
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status = delete_port(pid);
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return status;
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}
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#define IMPLEMENT_BEOS_FUNC(_FUNC_NAME, _FUNC)\
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status_t _FUNC_NAME(FILE *handle) \
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{ \
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int file_handle = fileno(handle); \
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if(file_handle == -1) \
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return B_IO_ERROR; \
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return _FUNC(file_handle); \
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} \
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IMPLEMENT_BEOS_FUNC(beos_flock, beos_lock)
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IMPLEMENT_BEOS_FUNC(beos_funlock, beos_unlock)
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#define IMPLEMENT_BE_FUNC(_FUNC_NAME, _HANDLE_TYPE, _FUNC)\
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int _FUNC_NAME(_HANDLE_TYPE handle)\
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{ \
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int ret_value = 0; \
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status_t status = _FUNC(handle); \
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if(status != B_OK) \
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{ \
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errno = status; \
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ret_value = -1; \
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} \
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return ret_value; \
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} \
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IMPLEMENT_BE_FUNC(be_lock, int, beos_lock)
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IMPLEMENT_BE_FUNC(be_unlock, int, beos_unlock)
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IMPLEMENT_BE_FUNC(be_flock, FILE *, beos_flock)
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IMPLEMENT_BE_FUNC(be_funlock, FILE *, beos_funlock)
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