Linux下进程之间通过消息队列通信小程序示例

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/*commom.h*/#include <sys/types.h>#include <unistd.h>#include <sys/ipc.h>#include <sys/msg.h>#include <string.h>#include <malloc.h>#define SIZE 512#define MAXSENDSIZE (sizeof(Message)-sizeof(long int))typedef struct {long int type;int val;char buffer[SIZE];}Message;int alloc_msg(Message **msg)/*注意要用双重指针来传递动态内存*/{*msg = (Message *)malloc(sizeof(Message));if (NULL == *msg){perror("alloc_msg failed!\n");exit(1);}memset(*msg, 0, sizeof(Message));return 0;}int free_msg(Message **msg)/*注意要用双重指针来释放动态内存*/{free(*msg);return 0;}int create_msg(key_t key){int msgid;msgid = msgget(key, 0666|IPC_CREAT);if (msgid == -1){perror("create_msg failed!\n");exit(1);}return msgid;}int send_msg(int msgid, Message *msg){if (msgsnd(msgid, (void*)msg, MAXSENDSIZE, 0)==-1){perror("send_msg failed!\n");exit(1);}return 0;}int rev_msg(int msgid, Message *msg,long int type){if (msgrcv(msgid, (void *)msg, MAXSENDSIZE, type, 0)==-1){perror("msg_rev failed!\n");exit(1);}return 0;}int del_msg(int msgid){if (msgctl(msgid, IPC_RMID, NULL)==-1){perror("msg_del failed!\n");exit(1);}return 0;}

/*send.c*/#include <stdio.h>#include <stdlib.h>#include "commom.h"int main(void){int msgid;key_t key;Message *msg = NULL;alloc_msg(&msg);key = ftok("./commom.h", 0);msgid = create_msg(key);msg->type = 1;msg->val = 10;strncpy(msg->buffer, "hello world", SIZE);send_msg(msgid, msg);msg->type = 2;msg->val = 12;strncpy(msg->buffer, "english test", SIZE);send_msg(msgid, msg);free_msg(&msg);return 0;}

/*receive.c*/#include <stdio.h>#include <stdlib.h>#include "commom.h"int main(void){int msgid;key_t key;Message *msg = NULL;alloc_msg(&msg);long int type1 = 1;long int type2 = 2;key = ftok("./commom.h", 0);msgid = create_msg(key);rev_msg(msgid, msg, type1);printf("rev_message is:type = %ld; %s, val = %d\n", msg->type, msg->buffer, msg->val);rev_msg(msgid, msg, type2);printf("rev_message is:type = %ld; %s, val = %d\n", msg->type, msg->buffer, msg->val);del_msg(msgid);free_msg(&msg);return 0;}

#makefileCFLAGS = -Wall -gCC = gccTARGET1 = sendTARGET2 = receiveall:$(TARGET1) $(TARGET2)$(TARGET1):$(TARGET1).o$(CC) $(CFLAGS) -o $@ $^$(TARGET2):$(TARGET2).o$(CC) $(CFLAGS) -o $@ $^%.o:%.c$(CC) -c $(CFLAGS) -o $@ $<clean:rm -f *.o $(TARGET1) $(TARGET2)

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