LINUX 下，编程自学五：msg,mem,pipe通信

最新推荐文章于 2022-08-07 16:06:53 发布

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本文展示了如何使用C语言实现共享内存和管道通信，包括创建共享内存、读写操作以及进程间的通信。

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msg.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<sys/types.h>

int main(int argc,char *argv[])
{
	int shmsid;
	pid_t	pid;
	key_t	key;
	char	*addr;
	
	//creat shm
	key = IPC_PRIVATE;
	shmsid = shmget(key,1024,IPC_CREAT|0660);
	if(shmsid < 0)	
	{
		perror("shmget");
		return -1;
	}

	addr = (char *)shmat(shmsid,NULL,0);
	/*if(addr = (char*)(-1))
	{
		perror("shmat");
		return -1;
	}*/

	printf("create share memeory add :%08x\n",addr);
	strcpy(addr,"this is share memory");

	pid = fork();
	if(pid < 0)
	{
		perror("fork");
		return -1;
	}

	if(pid == 0)
	{
		printf("here is child process,read shm:%s\n",addr);
	}
	else
	{
		wait(NULL);
		printf("here is parent process,read shm:%s\n",addr);
		
		system("ipcs -m");
		//delete shm
		if(shmdt(addr) < 0)
		{
			perror("shmdt");
			return -1;
		}

		if(shmctl(shmsid,IPC_RMID,NULL) < 0)
		{
			perror("shmctl");
			return -1;
		}
		printf("delete sucess\n");
	}
	

	return 0;
}

pipe.c

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

#define MAX_SIZE 128

int main(int argc,char *argv[])
{
	int	fd[2];
	pid_t	pid;
	char	message[MAX_SIZE];
	memset(message,0,sizeof(message));
	
	if(pipe(fd) < 0)
	{
		perror("pipe");
		return -1;
	}
	
	pid = fork();
	if(pid < 0)
	{
		perror("fork");
		return -1;
	}

	if(pid == 0)
	{
		close(fd[0]);
		printf("Here is Child Process,wile be written\n");
		write(fd[1],"I'm child!!",15);
	}
	else
	{
		close(fd[1]);
		printf("Here is Parent Process ,wile be read\n");
		read(fd[0],message,15);
		printf("message = %s\n",message);
	}	
	return 0;
}

sharemem.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<sys/types.h>

int main(int argc,char *argv[])
{
	int shmsid;
	pid_t	pid;
	key_t	key;
	char	*addr;
	
	//creat shm
	key = IPC_PRIVATE;
	shmsid = shmget(key,1024,IPC_CREAT|0660);
	if(shmsid < 0)	
	{
		perror("shmget");
		return -1;
	}

	addr = (char *)shmat(shmsid,NULL,0);
	/*if(addr = (char*)(-1))
	{
		perror("shmat");
		return -1;
	}*/

	printf("create share memeory add :%08x\n",addr);
	strcpy(addr,"this is share memory");

	pid = fork();
	if(pid < 0)
	{
		perror("fork");
		return -1;
	}

	if(pid == 0)
	{
		printf("here is child process,read shm:%s\n",addr);
	}
	else
	{
		wait(NULL);
		printf("here is parent process,read shm:%s\n",addr);
		
		system("ipcs -m");
		//delete shm
		if(shmdt(addr) < 0)
		{
			perror("shmdt");
			return -1;
		}

		if(shmctl(shmsid,IPC_RMID,NULL) < 0)
		{
			perror("shmctl");
			return -1;
		}
		printf("delete sucess\n");
	}
	

	return 0;
}