[Pipe] read mass data from command by using pipe

Code

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main()
{
    FILE *read_fp;
    char buffer[BUFSIZ + 1];
    int chars_read;

    memset(buffer, '\0', sizeof(buffer));
    read_fp = popen("ps -ax", "r");
    if (read_fp != NULL) {
        chars_read = fread(buffer, sizeof(char), BUFSIZ, read_fp);
        while (chars_read > 0) {
            buffer[chars_read - 1] = '\0';
            printf("Reading:-\n %s\n", buffer);
            chars_read = fread(buffer, sizeof(char), BUFSIZ, read_fp);
        }
        pclose(read_fp);
        exit(EXIT_SUCCESS);
    }
    exit(EXIT_FAILURE);
}

Result

Reading:-
   PID TTY      STAT   TIME COMMAND
    1 ?        Ss     0:01 /sbin/init
    2 ?        S      0:00 [kthreadd]
    3 ?        S      0:03 [ksoftirqd/0]
    5 ?        S<     0:00 [kworker/0:0H]
    7 ?        S<     0:00 [kworker/u:0H]
    8 ?        S      0:00 [migration/0]
    9 ?        S      0:00 [rcu_bh]
   10 ?        S      0:09 [rcu_sched]
   11 ?        S      0:00 [watchdog/0]
   12 ?        S      0:00 [watchdog/1]
   13 ?        S      0:03 [ksoftirqd/1]
   16 ?        S<     0:00 [kworker/1:0H]
   .....