Demonstrates error in finding the system configuration of terminal as mentioned in http://man7.org/tlpi/

term_limits.c

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

int main() {
  long max_input, max_canon;

  max_input = sysconf(_SC_MAX_INPUT);
  max_canon = sysconf(_SC_MAX_CANON);

  printf("max_input: %ld \n", max_input);
  printf("max_canon: %ld \n", max_canon);
  return 0;
}

term_limits.output.txt

$ gcc term_limits.c -o term_limit.out
term_limits.c:7:23: error: use of undeclared identifier '_SC_MAX_INPUT'
  max_input = sysconf(_SC_MAX_INPUT);
                      ^
term_limits.c:8:23: error: use of undeclared identifier '_SC_MAX_CANON'
  max_canon = sysconf(_SC_MAX_CANON);
                      ^
2 errors generated.