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6. SOCKET
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Int pipe(int filedes[2]);
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#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
int pipe_fd[2];
pid_t pid;
char buf_r[100];
char* p_wbuf;
int r_num;
memset(buf_r,0,sizeof(buf_r));
if(pipe(pipe_fd)<0)
{
printf("pipe create error\n");
return -1;
}
if((pid=fork())==0)
{
printf("\n");
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