Question

How to read all the standard output from the process in C

Answer 1

#include <stdio.h>

void print(FILE *fp)
{
    int c;
    while ((c = getc(fp)) != EOF)
        putchar(c);
}
int main(void)
{
    FILE *fp;

    if ((fp = popen("netstat", "r")) == NULL)
        return 1;
  
    print(fp);
    
    pclose(fp);
    
    return 0;
}
    
/*
run:
 

Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    127.0.0.1:....         Avi-PC:.....           ESTABLISHED
  TCP    123.456.9.789:.....    fw-okpk123:https       ESTABLISHED
  TCP    123.456.9.789:.....    mmpb:imap              ESTABLISHED
  ...
  
*/

 

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