linux 消息队列

主要使用函数清单：

// 键值构建函数#include <sys/types.h>#include <sys/ipc.h>key_t ftok(const char *pathname, int proj_id);// 创建与获取消息队列函数#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>int msgget(key_t, int msgflg);// 发送消息函数#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>int msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg);// 接收消息函数#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>ssize_t msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg);// 消息控制函数#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>int msgctl(int msqid, int cmd, struct msqid_ds *buf);

服务端：

#include <stdio.h>  #include <string.h>  #include <stdlib.h>  #include <errno.h>  #include <unistd.h>  #include <sys/types.h>  #include <sys/ipc.h>  #include <sys/stat.h>  #include <sys/msg.h>  #define MSG_FILE "server.c"  #define BUFFER 255  /*S_IRUSR  Permits the file's owner to read it.S_IWUSR  Permits the file's owner to write to it.S_IRGRP  Permits the file's group to read it.S_IWGRP  Permits the file's group to write to it.*/#define PERM S_IRUSR|S_IWUSR   struct msgtype {  long mtype;  char buffer[BUFFER+1];  };  int main()  {  struct msgtype msg;  key_t key;  int msgid;   //  创建键值if((key=ftok(MSG_FILE,'a'))==-1)  {  fprintf(stderr,"Creat Key Error：%s\a\n",strerror(errno));  exit(1);  }  // 创建消息队列if((msgid=msgget(key,PERM|IPC_CREAT|IPC_EXCL))==-1)  {  fprintf(stderr,"Creat Message Error：%s\a\n",strerror(errno));  exit(1);  }  while(1)  {  // 从队列中获取消息msgrcv(msgid,&msg,sizeof(struct msgtype),1,0);  fprintf(stderr,"Server Receive：%s\n",msg.buffer);  msg.mtype=2;  // 发送消息msgsnd(msgid,&msg,sizeof(struct msgtype),0);  }  exit(0);  }

客户端：

#include <stdio.h>  #include <string.h>  #include <stdlib.h>  #include <errno.h>  #include <sys/types.h>  #include <sys/ipc.h>  #include <sys/msg.h>  #include <sys/stat.h>  #define MSG_FILE "server.c"  #define BUFFER 255  #define PERM S_IRUSR|S_IWUSR  struct msgtype {  long mtype;  char buffer[BUFFER+1];  };  int main(int argc,char **argv)  {  struct msgtype msg;  key_t key;  int msgid;  if(argc!=2)  {  fprintf(stderr,"Usage：%s string\n\a",argv[0]);  exit(1);  }  if((key=ftok(MSG_FILE,'a'))==-1)  {  fprintf(stderr,"Creat Key Error：%s\a\n",strerror(errno));  exit(1);  }  if((msgid=msgget(key,PERM))==-1)  {  fprintf(stderr,"Creat Message Error：%s\a\n",strerror(errno));  exit(1);  }  msg.mtype=1;  strncpy(msg.buffer,argv[1],BUFFER);  msgsnd(msgid,&msg,sizeof(struct msgtype),0);  memset(&msg,'\0',sizeof(struct msgtype));  msgrcv(msgid,&msg,sizeof(struct msgtype),2,0);  fprintf(stderr,"Client receive：%s\n",msg.buffer);  exit(0);  }