code. compile. run. debug. share.
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include <sys/wait.h>
#include<fcntl.h>
int main()
{
int fd,ret;
char buf[20];
pid_t pid;
off_t offset = 0;
fd = open("./test.file",O_RDWR);
if(fd < 0){
perror("open");
exit(1);
}
printf("new file descriptor :%d\n",fd);
pid = fork();
if(pid == 0){
ret = pwrite(fd,"Welcome to India",16,offset);
if(ret < 0)
perror("child write:");
ret = pread(fd,buf,4,offset);
if(ret < 0)
perror("child read:");
buf[ret] = '\0';
printf("In child:%s\n",buf);
close(fd);
ret = pread(fd,buf,4,offset);
if(ret < 0)
perror("child read:");
}
else{
wait(NULL);
ret = pread(fd,buf,10,offset);
if(ret < 0)
perror("parent read:");
buf[ret] = '\0';
printf("In parent:%s\n",buf);
}
return 0;
}
Welcome to India
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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