#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>

/*
 * This shows how to print the specific error reason when something goes wrong
 * with a file.
 */

int main(int argc, char* argv[]) {
    FILE* fp = fopen("yo.txt", "r");

    fputc('!', fp);  // WON'T WORK ... file opened for reading only 

    if(ferror(fp)) {
        // Print just the current error message
        perror(NULL);
        // Output:
        // Bad file descriptor

        // Print the current message with something else we want to add, e.g., the filename
        perror("yo.txt");
        // Output:
        // yo.txt: Bad file descriptor

    }
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */