Linux下进程的创建与进程间通信？

代码示例：

#include <stdio.h>

#include <unistd.h>

#include <fcntl.h>

#define READ_TERMINAL 0

#define WRITE_TERMINAL 1

int main() {

int file_descriptors;

pid_t pid_f;

char PipeBuf={‘a’,‘0’};

int read_ret=0;

pipe(file_descriptors);

pid_f=fork();

if (pid_f<0)

{

printf(“fork error!n”);

exit(1);

}

else if (pid_f==0)

{

//子进程向父进程发一则消息

printf(“Write in Pipe To FatherProcess!n”);

close(file_descriptors);

sleep(1);

write(file_descriptors,“Child Send”,sizeof(“Child Send”));

//open(file_descriptors);

}

else

{

//父进程接收(读取)消息

printf(“Read in Pipe From ChildProcess!n”);

//通过fcntl()修改为使得读管道数据具有非阻塞的特性

int flag=fcntl(file_descriptors,F_GETFL,0);

flag |= O_NONBLOCK;

if(fcntl(file_descriptors,F_SETFL,flag) < 0){

perror(“fcntl”);

exit(1);

}

close(file_descriptors);

read_ret=read(file_descriptors,PipeBuf,sizeof(PipeBuf));//没阻塞的读

printf(“Read Message are : %sn”,PipeBuf);