CODEWITHSUNDEEP
csystem
Abhishek
Abhishek

Reputation: 2673

printf command before closing the file descriptor still calling in the external file

I wrote this code to get my hands working on the system calls. I expected the first printf to show result in the console.. but both of them are showing the the given file location.. 

#include<stdio.h>
#include <unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>

void main(){
printf("Hello World!!! Before close\n");
close(1);
int fd = open("/home/abhishek/Desktop/example.txt",O_RDWR);
printf("Hello World!!! After close");
}

Where actually am going wrong??

Upvotes: 2

Views: 507

Answers (1)

Greg Hewgill
Greg Hewgill

Reputation: 992717

The output to stdout may be buffered, and not actually written to the underlying file descriptor until the stream is flushed or closed. Try:

fflush(stdout);

before close(1).

Note that mixing stdio and system file descriptor operations is not generally a good idea. Use one or the other, otherwise you may get confusing behaviour like you have shown.

Upvotes: 2

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