pipe
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#include<unistd.h>
#include<errno.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
int main()
{
int pipe_fd[2];
pid_t pid;
char r_buf[100];
char w_buf[4];
char *p_wbuf;
int r_num;
int cmd;
memset(r_buf, 0, sizeof(r_buf));
memset(w_buf, 0, sizeof(r_buf));
p_wbuf = w_buf;
if(pipe(pipe_fd) < 0)
{
printf("pipe creat error\n");
return -1;
}
if((pid = fork()) == 0)
{
printf("\n");
close(pipe_fd[1]);
sleep(3);
r_num = read(pipe_fd[0], r_buf,100);
printf("read num is %d ,the date read from the pipe is %d\n", r_num, atoi(r_buf));
close(pipe_fd[0]);
exit(0);
}
else if(pid > 0)
{
close(pipe_fd[0]);
strcpy(w_buf, "123");
if(write(pipe_fd[1], w_buf, 4) != -1)
{
printf("parent write over\n");
}
close(pipe_fd[1]);
printf("parent close fd[1] over\n");
sleep(10);
}
}
#include<errno.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
int main()
{
int pipe_fd[2];
pid_t pid;
char r_buf[100];
char w_buf[4];
char *p_wbuf;
int r_num;
int cmd;
memset(r_buf, 0, sizeof(r_buf));
memset(w_buf, 0, sizeof(r_buf));
p_wbuf = w_buf;
if(pipe(pipe_fd) < 0)
{
printf("pipe creat error\n");
return -1;
}
if((pid = fork()) == 0)
{
printf("\n");
close(pipe_fd[1]);
sleep(3);
r_num = read(pipe_fd[0], r_buf,100);
printf("read num is %d ,the date read from the pipe is %d\n", r_num, atoi(r_buf));
close(pipe_fd[0]);
exit(0);
}
else if(pid > 0)
{
close(pipe_fd[0]);
strcpy(w_buf, "123");
if(write(pipe_fd[1], w_buf, 4) != -1)
{
printf("parent write over\n");
}
close(pipe_fd[1]);
printf("parent close fd[1] over\n");
sleep(10);
}
}
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