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shm_client.c
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shm_client.c
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#include "common.h"
struct msg_form
{
long mtype;
char mtext;
};
union semun
{
int val;
struct semid_ds *buf;
unsigned short *array;
};
int init_sem(int sem_id,int value)
{
union semun tmp;
tmp.val = value;
if( semctl(sem_id,0,SETVAL,tmp)==-1 )
{
perror("Init Semaphore Error");
return -1;
}
return 0;
}
int sem_p(int sem_id)
{
struct sembuf sbuf;
sbuf.sem_num = 0;
sbuf.sem_op = -1;
sbuf.sem_flg = SEM_UNDO;
if( semop(sem_id,&sbuf,1) == -1 )
{
perror("Semaphore Action P Error\n");
return -1;
}
return 0;
}
int sem_v(int sem_id)
{
struct sembuf sbuf;
sbuf.sem_num = 0;
sbuf.sem_op = 1;
sbuf.sem_flg = SEM_UNDO;
if( semop(sem_id,&sbuf,1) == -1 )
{
perror("Semaphore Action V Error\n");
return -1;
}
return 0;
}
int del_sem(int sem_id)
{
union semun tmp;
if(semctl(sem_id,0,IPC_RMID,tmp)==-1)
{
perror("Delete Semaphore Error");
return -1;
}
return 0;
}
int creat_sem(key_t key)
{
int sem_id;
if( (sem_id = semget(key,1,IPC_CREAT|0666)) == -1 )
{
perror("semget error");
exit(-1);
}
init_sem(sem_id,1);
return sem_id;
}
int main()
{
key_t key;
int shmid,semid,msqid;
char *shm;
char data[] = "this is client";
struct msg_form msg;
if( (key=ftok("./test.txt",256)) == -1 )
{
perror("Ftok Error");
exit(1);
}
if((shmid = shmget(key,0,IPC_CREAT|0666))==-1)
{
perror("Shmget Error");
exit(1);
}
shm = shmat(shmid,0,0);
if((long)shm == -1)
{
perror("Shmat Error");
exit(1);
}
if((semid = semget(key,1,IPC_CREAT|0666))==-1)
{
perror("Semget Error");
exit(1);
}
if((msqid = msgget(key,IPC_CREAT|0777)) == -1)
{
perror("Msgget error");
exit(1);
}
sem_p(semid);
scanf("%[^\n]",shm);
sem_v(semid);
msg.mtype = 888;
msg.mtext = 'r';
msgsnd(msqid,&msg,1,0);
shmdt(shm);
}