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/********************************************************************
* Description: shm.cc
*
* Derived from a work by Fred Proctor & Will Shackleford
*
* Author:
* License: LGPL Version 2
* System: Linux
*
* Copyright (c) 2004 All rights reserved.
*
* Last change:
********************************************************************/
#include "shm.hh"
#include "_shm.h" /* rcs_shm_open(), rcs_shm_close() */
#include "rcs_print.hh" // rcs_print_error()
extern "C" {
#include <stdio.h> /* fprintf(), stderr */
#include <sys/types.h> /* key_t */
#include <stddef.h> /* size_t */
#include <errno.h> // errno
#include <sys/ipc.h> // IPC_CREAT
}
RCS_SHAREDMEM::RCS_SHAREDMEM(key_t key, size_t size, int oflag, int mode)
{
shm = NULL;
addr = NULL;
delete_totally = 0;
create_errno = 0;
created = 0;
if (oflag & RCS_SHAREDMEM_CREATE) {
/* create shared memory */
#ifdef USE_POSIX_SHAREDMEM
shm = rcs_shm_open(key, size, O_CREAT, mode);
#else
shm = rcs_shm_open(key, size, IPC_CREAT, mode);
#endif
if (shm == NULL) {
create_errno = errno;
rcs_print_error("can't create shared memory\n");
return;
}
} else {
/* attach to existing shared memory */
shm = rcs_shm_open(key, size, 0);
if (shm == NULL) {
create_errno = errno;
rcs_print_error
("can't attach to shared memory-- is master started?\n");
return;
}
}
create_errno = shm->create_errno;
created = shm->created;
/* duplicate the pointer, so users don't have to dig into shm->addr */
addr = shm->addr;
}
RCS_SHAREDMEM::~RCS_SHAREDMEM()
{
if (shm == NULL) {
return;
} else {
if (delete_totally) {
rcs_shm_delete(shm);
} else {
rcs_shm_close(shm);
}
shm = NULL;
}
}
int
RCS_SHAREDMEM::nattch()
{
if (shm == NULL) {
return -1;
} else {
return rcs_shm_nattch(shm);
}
}
// This constructor declared private to prevent copying
RCS_SHAREDMEM::RCS_SHAREDMEM(RCS_SHAREDMEM & shm)
{
}
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