shmread.c

来自「这个资料非常不错」· C语言 代码 · 共 51 行

/************
 * shmread.c*
 ************/
/* Includes */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

typedef struct
{
int tc_number;
char ap_name[5];
char mymessage[20];

} COMM_TABLE;

main()
{

/* local variables */
int ret= 0;
key_t key;
int i;
int shm_id;
int found = 0;
COMM_TABLE *comm_reg;
char * pointer;


key = ftok(".",'w');

/* share memory has been created */
if ((shm_id = shmget(key , sizeof(COMM_TABLE),0)) == -1)
{
printf("error = %d\n", errno);
return (ret);

}
comm_reg = (COMM_TABLE *) shmat(shm_id, (char *) 0, (int)NULL);
printf("tc number=%d!!!\n", comm_reg->tc_number);

/* kill share memory */

shmctl(shm_id,IPC_RMID,0);
exit(0);
}