linux下用消息队列关闭bash-----进程间通信-优快云博客

本文链接：https://blog.youkuaiyun.com/jinlong1990/article/details/7546944

本文介绍了一种通过消息队列在两个程序间传递进程ID的方法。程序A负责查找bash进程并将其PID发送出去；程序B接收PID并终止相应的bash进程。文章详细展示了实现过程及存在的问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

要求：

写2个程序,
程序a负责在内存里找bash,并把找到的bash,的PID转成int型的数据,到送给另一个进程,

程序b,接收数据,把这个PID关闭掉

数据传输用消息队列
程序A：

程序1：mesg.c

#include <stdio.h>
#include <stdlib.h>

#include <unistd.h>
#include"common.h"
int main(void)
{

/* 自定义消息结构体*/
struct mymsgbuf qbuf;
int msgqueue_id = mes_get();
pid_t pid;
char buf[100];
while(1)
{
  /*   找bash的pid */
  pid = findPid("bash");
  /* */
  sprintf(buf,"%d",pid);
  printf("pid=%d\n",pid);

   /*发送pid*/
  send_message(msgqueue_id, &qbuf, 1, buf);
  /*是0代表没找到bash*/
  if(pid == 0)break;
        sleep(1);
}
return EXIT_SUCCESS;
}

程序2：common.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
#include<string.h>
#include"mes.h"

int mes_get()
{
key_t key;
int msgqueue_id;
key = ftok("/root", 'm');
if (-1 == (msgqueue_id = msgget(key, IPC_CREAT | 0660)))
{
perror("msgget");
exit(1);
}
return msgqueue_id;

}

void read_message(int qid, struct mymsgbuf *qbuf, long type)
{
printf("Reading a message ...\n");
qbuf->mtype = type;
msgrcv(qid, (struct msgbuf*) qbuf, MAX_SEND_SIZE, type, 0);

}

void send_message(int qid, struct mymsgbuf *qbuf, long type, char* text)
{
printf("Sending a message ... \n");
qbuf->mtype = type;
strcpy(qbuf->mtext,text);

if (-1 == (msgsnd(qid, (struct msgbuf*)qbuf, strlen(qbuf->mtext)+1, 0)))
{
  printf("gnhd\n");
  perror("msgsnd");
  exit(1);
}

}

void remove_queue(int qid)
{
msgctl(qid, IPC_RMID, 0);
}

int findPid(char *name)
{

char buf[100];
sprintf(buf, "ps -A | grep %s", name); //根据文件名找运行的pid
FILE *fp = popen(buf, "r");
if (fgets(buf, sizeof(buf), fp) != NULL)
{
pclose(fp);

return atoi(buf); /* 找到则返回PID*/
}
pclose(fp);
return 0; /* 如果找不到，则返回0*/
}

程序3：common.h

#ifndef MES_H_
#define MES_H_
#define MAX_SEND_SIZE 80
struct mymsgbuf
{
long mtype;
char mtext[100];
};
int mes_get();
void send_message(int qid,struct mymsgbuf *qbuf,long type,char* text);
void read_message(int qid,struct mymsgbuf *qbuf,long type);
void remove_queue(int qid);
int findPid(char *name);

#endif /* MES_H_ */

程序B:killbash.c

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "common.h"
#include <unistd.h>

int main(void)
{
/* 创建消息队列*/

int msgqueue_id = mesg_get();
struct mymsgbuf qbuf;
pid_t pid;
while (1)
{
  /* 读消息 */
  read_message(msgqueue_id, &qbuf, 0);
  pid = atoi(qbuf.mtext);
  /* 打印PID*/
  printf("pid=%d\n", pid);
  if (pid == 0)
  {
       break;
  }
  /* 根据pid关bash*/
  kill(pid, SIGKILL);
  sleep(1);
}
/* 删除消息队列*/
remove_queue(msgqueue_id);
return EXIT_SUCCESS;
}