#include
#include
#include types.h>
#include msg.h>
#include
#include ipc.h>
void msg_show_attr(int msg_id, struct msqid_ds msg_info)
{
int ret = -1
sleep(1)
ret = msgctl(msg_id, IPC_STAT, &msg_info)
if( -1 == ret)
{
printf(获消息信息失败\n)
return
}
printf(\n)
printf(现队列字节数:%d\n,msg_info.msg_cbytes)
printf(队列消息数:%d\n,msg_info.msg_qnum)
printf(队列字节数:%d\n,msg_info.msg_qbytes)
printf(发送消息进程pid:%d\n,msg_info.msg_lspid)
printf(接收消息进程pid:%d\n,msg_info.msg_lrpid)
printf(发送消息间:%s,ctime(&(msg_info.msg_stime)))
printf(接收消息间:%s,ctime(&(msg_info.msg_rtime)))
printf(变化间:%s,ctime(&(msg_info.msg_ctime)))
printf(消息UID:%d\n,msg_info.msg_perm.uid)
printf(消息GID:%d\n,msg_info.msg_perm.gid)
}
int main(void)
{
int ret = -1
int msg_flags, msg_id
key_t key
struct msgmbuf{
int mtype
char mtext[10]
}
struct msqid_ds msg_info
struct msgmbuf msg_mbuf
int msg_sflags,msg_rflags
char *msgpath = /ipc/msg/
key = ftok(msgpath,’a')
if(key != -1)
{
printf(功建立KEY\n)
}
else
{
printf(建立KEY失败\n)
}
msg_flags = IPC_CREAT
msg_id = msgget(key, msg_flags|0666)
if( -1 == msg_id)
{
printf(消息建立失败\n)
return 0
}
msg_show_attr(msg_id, msg_info)
msg_sflags = IPC_NOWAIT
msg_mbuf.mtype = 10
memcpy(msg_mbuf.mtext,测试消息,sizeof(测试消息))
ret = msgsnd(msg_id, &msg_mbuf, sizeof(测试消息), msg_sflags)
if( -1 == ret)
{
printf(发送消息失败\n)
}
msg_show_attr(msg_id, msg_info)
msg_rflags = IPC_NOWAIT|MSG_NOERROR
ret = msgrcv(msg_id, &msg_mbuf, 10,10,msg_rfla
共享内存示例代码:
#include
#include sem.h>
#include ipc.h>
#include
typedef int sem_t
union semun {
int val
struct semid_ds *buf
unsigned short *array
} arg
sem_t CreateSem(key_t key, int value)
{
union semun sem
sem_t semid
sem.val = value
semid = semget(key,value,IPC_CREAT|0666)
if (-1 == semid)
{
printf(create semaphore error\n)
return -1
}
semctl(semid,0,SETVAL,sem)
return semid
}
/*
struct sembuf{
ushort sem_num
short sem_op
short sem_flg
}
*/
void SetvalueSem(sem_t semid, int value)
{
union semun sem
sem.val = value
semctl(semid,0,SETVAL,sem)
return
}
int GetvalueSem(sem_t semid)
{
union semun sem
return semctl(semid,0,GETVAL,sem)
return sem.val
}
void DestroySem(sem_t semid)
{
union semun sem
sem.val = 0
semctl(semid,0,IPC_RMID,sem)
}
int Sem_P(sem_t semid)
{
struct sembuf sops={0,+1,IPC_NOWAIT}
return (semop(semid,&sops,1))
}
int Sem_V(sem_t semid)
{
struct sembuf sops={0,-1,IPC_NOWAIT}
return (semop(semid,&sops,1))
}
static char msg[]=共享内存\n
int main(void)
{
key_t key
int semid,shmid
char i,*shms,*shmc
struct semid_ds buf
int value = 0
char buffer[80]
pid_t p
key = ftok(/ipc/sem/,’a')
shmid = shmget(key,1024,IPC_CREAT|0604)
semid = CreateSem(key,1)
p = fork()
if(p >0)
{
/* 父进程 */
/* 建立共享内存 */
shms = (char *)shmat(shmid,0,0)
memcpy(shms, msg, strlen(msg)+1)
sleep(10)
Sem_P(semid)
shmdt(shms)
DestroySem(semid)
}
else if(p == 0)
{
shmc = (char *)shmat(shmid,0,0)
Sem_V(semid)
printf(共享内存值:%s\n,shmc)
shmdt(sg_
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