neipc.c

来自「sco unix下c语言开发工具库」· C语言 代码 · 共 168 行

/*
  ipc.c --  IPC opreation
*/

#include	<stdio.h>
#include	<sys/types.h>
#include	<sys/ipc.h>
#include	<sys/msg.h>

#include	"../incl/mytools.h"



key_t	ne_getipckey ( msgfile, id )
char	* msgfile;
char	id;
{
	return ( ftok ( ( char * ) getfname ( "WORKDIR", msgfile ), id ) );
}



ne_creat_msg ( msgfile, id )
char	* msgfile;
char	id;
{
	key_t 	key;
	int	msgid;


	if ( ( key = getipckey ( msgfile, id ) ) < 0 )
		return ( -1 );


	if ( ( msgid = msgget ( key, IPCCREAT ) ) < 0 )
		return ( -1 );


	return ( msgid );
}



ne_get_msg ( msgfile, id )
char	* msgfile;
char	id;
{
	key_t 	key;
	int	msgid;


	if ( ( key = getipckey ( msgfile, id ) ) < 0 )
		return ( -1 );

	if ( ( msgid = msgget ( key, IPCGET ) ) < 0 )
		return ( -1 );

	return ( msgid );
}



ne_rm_msg ( msgfile, id )
char	* msgfile;
char	id;
{
	int	msgid;

/**jgdelete
	if ( ( msgid = get_msg ( msgfile, id ) ) < 0 )
		return ( -1 );


	if ( msgctl ( msgid, IPC_RMID, NULL ) < 0 )
		return ( -1 );

jgdelete**/
	return ( 0 );
}



char	* ne_creat_shm ( shmfile, id, len )
char	* shmfile;
char	id;
int	len;
{
	int	shmid;
	key_t	key;
	char	* shmptr;
	

	if ( ( key = getipckey ( shmfile, id ) ) < 0 )
		return ( NULL );


	if ( ( shmid = shmget ( key, len, IPCCREAT ) ) < 0 )
		return ( NULL );


	if ( ( shmptr = ( char * ) shmat ( shmid, 0, 0 ) ) == NULL )
		return ( NULL );

	return ( shmptr );
}



char	* ne_get_shm (shmfile, id, len)
char	*shmfile;
char	id;
int	len;
{
	int shmid;
	key_t key;
	char *shmptr;
	

	if ( ( key = getipckey ( shmfile, id ) ) < 0 ) 
		return ( NULL );

	if ( ( shmid = shmget ( key, len, IPCGET ) ) < 0 ) 
		return ( NULL );


	if ( ( shmptr = ( char * ) shmat ( shmid, 0, 0 ) ) == NULL ) 
		return ( NULL );

	return ( shmptr );
}



ne_dt_shm ( shmptr )
char	* shmptr;
{

	if ( shmdt ( shmptr ) < 0 )
		return ( -1 ) ;

	return ( 0 );
}




ne_rm_shm ( shmfile, id )
char	* shmfile;
char	id;
{
	key_t	key;
	int	shmid;

	if ( ( key = getipckey ( shmfile, id ) ) < 0 )
		return ( -1 );


	if ( ( shmid = shmget ( key, 2, IPCGET ) ) < 0 )
		return ( -1 );


	if ( shmctl ( shmid, IPC_RMID, NULL ) < 0 )
		return ( -1 );


	return ( 0 );
}