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deb-goldedplus/goldlib/gall/be_lock.c
2005-10-23 04:39:25 +00:00

91 lines
2.5 KiB
C

/*
BeLock.c - implementation of Fido-style message bases lock BeOS library.
bases lock BeOS library.
This code is written by Siarzhuk Zharski <imker@gmx.li> for free and
can be used for any purposes in any form without any warranties.
*/
#include <stdio.h>
#include <errno.h>
#include "be_lock.h"
static const char rcsid[]="$Id$";
static status_t look_for_port(int file_handle, bool b_create, port_id *port_id_ptr)
{
status_t status = B_OK;
struct stat st = {0};
char name[B_OS_NAME_LENGTH] = {0};
if(fstat(file_handle, &st))
return B_IO_ERROR;
sprintf(name, "FidoLock:%08X:%08X", st.st_dev, st.st_ino);
*port_id_ptr = find_port(name);
if(*port_id_ptr == B_NAME_NOT_FOUND)
{
if(b_create)
{
*port_id_ptr = create_port(1, name);
if(*port_id_ptr == B_BAD_VALUE || *port_id_ptr == B_NO_MORE_PORTS)
status = *port_id_ptr;
}
else
status = B_NAME_NOT_FOUND;
}
else // already have such lock ...
status = B_BUSY;
return status;
}
status_t beos_lock(int file_handle)
{
port_id pid = 0;
return look_for_port(file_handle, true, &pid);
}
status_t beos_unlock(int file_handle)
{
port_id pid = 0;
status_t status = look_for_port(file_handle, false, &pid);
if(status == B_BUSY)
status = delete_port(pid);
return status;
}
#define IMPLEMENT_BEOS_FUNC(_FUNC_NAME, _FUNC)\
status_t _FUNC_NAME(FILE *handle) \
{ \
int file_handle = fileno(handle); \
if(file_handle == -1) \
return B_IO_ERROR; \
return _FUNC(file_handle); \
} \
IMPLEMENT_BEOS_FUNC(beos_flock, beos_lock)
IMPLEMENT_BEOS_FUNC(beos_funlock, beos_unlock)
#define IMPLEMENT_BE_FUNC(_FUNC_NAME, _HANDLE_TYPE, _FUNC)\
int _FUNC_NAME(_HANDLE_TYPE handle)\
{ \
int ret_value = 0; \
status_t status = _FUNC(handle); \
if(status != B_OK) \
{ \
errno = status; \
ret_value = -1; \
} \
return ret_value; \
} \
IMPLEMENT_BE_FUNC(be_lock, int, beos_lock)
IMPLEMENT_BE_FUNC(be_unlock, int, beos_unlock)
IMPLEMENT_BE_FUNC(be_flock, FILE *, beos_flock)
IMPLEMENT_BE_FUNC(be_funlock, FILE *, beos_funlock)