0022627: Change OCCT memory management defaults

[occt.git] / src / OSD / OSD_Csharedmemory.c

#if !defined( WNT ) && !defined(__hpux) && !defined( HPUX)
#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#if defined(HAVE_STDLIB_H)
#include <stdlib.h>
#endif
#if defined(HAVE_MALLOC_H)
#include <malloc.h>
#endif

/* Modified by Stephan GARNAUD (ARM) 1992 for Matra Datavision */


static int status ;

/* #ifdef ANSI */
int osd_getkey(char *) ;
int create_sharedmemory (int **,char *,int);
int open_sharedmemory   (int **,char *,int);
int remove_sharedmemory (int * ,char *    );
/* #endif */


int create_sharedmemory(int **section, char *section_name, int section_size) 
/*===============================

	CREATE a mapping memory section

        returns 0 if failed
        otherwise successfull : the shared memory id 

===============================================================*/
{

        key_t key;
        key = (key_t) osd_getkey (section_name);

	*section = NULL ;
	status = shmget(	key,section_size,0750 + IPC_CREAT) ;

	if( status < 0 ) return 0 ;  /* shmget failed */
	else {
	      *section = (int*)shmat(status,NULL,0) ; /* shmat failed */

	      if( *section == (int*)-1 ) {
		     *section = (int*)malloc(section_size) ;
		     return 0 ;
		}
	}
	return status;
}


int open_sharedmemory(int **section, char *section_name, int section_size) 
/*=============================

	OPEN a mapping memory section
        We suppose that the shared memory segment is already
        created(allocated)
        Returns Value:
             0 : If failed
        otherwise successfull 
================================================================*/
{

        key_t key;
        key = (key_t) osd_getkey (section_name);

	*section = NULL ;
        /* Test if shared memory identified by "k" exists ? */
	status = shmget( key,0,0) ;

	if( status < 0 ) return 0;  /* shmget failed */

        /* Try to attach the shared memory to the current process */
        *section = (int*)shmat(status,NULL,0) ;

	if( *section == (int*)-1 ) return 0; /* shmat failed */

	return status ;
}


int remove_sharedmemory(int *shmid, char *section_name) 
/*===========================================

	CLOSE a mapping memory section

========================================================*/
{
	status = shmctl(*shmid ,IPC_RMID,NULL) ;
        if (status < 0) return 0;
                   else return 1;
}
#endif