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#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#define MAXLINE 1024
int main(void)
{
int n,files[2];
pid_t pid;
char line[MAXLINE];
if(pipe(files)<0)
{
fprintf(stderr,"pipe error!\n);
exit(1);
}
if((pid=fork())<0)
{
fprintf(stderr,"fork error!\n");
exit(1);
}
else if(pid>0)
{
close(fd[0]);
write(fd[1],"how are you!\n",13);
}
else
{
close(fd[1]);
n=read(fd[0],line,MAXLINE);
write(STDOUT_FILENO,line,n);
}
exit(0);
}
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#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
#define MAXLINE 1024
int main(void)
{
int n,int1,int2;
char line[MAXLINE];
while((n=read(STDIN_FILENO,line,MAXLINE))>0)
{
line[n]=0;
if(sscanf(line,"%d+%d",&int1,&int2)==2)
{
sprintf(line,"%d\n",int1+int2);
n=strlen(line);
if(write(STDOUT_FILENO,line,n)!=n)
{
fprintf(stderr,"write error!\n");
exit(1);
}
}
else
{
if(write(STDOUT_FILENO,"invalid args\n",13)!=13)
{
fprintf(stderr,"write error error!\n");
exit(1);
}
}
}
exit(0);
}

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#include<stdio.h>
#include<signal.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#define MAXLINE 1024
static void sig_pipe(int);
int main(void)
{
int n,fd1[2],fd2[2];
pid_t pid;
char line[MAXLINE];
if(signal(SIGPIPE,sig_pipe)==SIG_ERR)
{
fprintf(stderr,"signal error!\n");
exit(1);
}
if(pipe(fd1)<0 || pipe(fd2)<0)
{
fprintf(stderr,"pipe error!\n");
exit(1);
}
if((pid=fork())<0)
{
fprintf(stderr,"fork error!\n");
exit(1);
}
else if(pid>0)
{
close(fd1[0]);
close