Thread: atexit() and function parameter's

Hey all....thanks for previous help...starting to do about 4 hrs C programming a day.

question with this line (function prototype and function itself)

Code:

void close_function(FILE *fp, char buffer);

I am not sure how to pass FILE *fp & buffer to the close_function function. I understand buffer isn't a value, but i cannot tell what it is. It's not a char array, and does not return a value.

Code:

// Write a function that opens a new temporary file with a specified mode.  All temporary files created by this function should automatically be closed and deleted when the program terminates. (Hint: Use the atexit() library function).

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

void close_function(FILE *fp, char buffer);
void start_function(void);

int main( void )
{
    atexit(close_function);

    start_function();

    return 0;
}

void start_function(void)
{
    FILE *fp;

    char mode[4];
    char buffer[80];

    tmpnam(buffer);

    while (1)
    {

        puts("\nEnter a mode (max 3 characters): ");
        gets(mode);

        if ( (fp = fopen(buffer, mode )) != NULL )
        {
            printf("\nSuccessful opening %s in mode %s.\n", buffer, mode);
        }

        break;
    }
}

void close_function(FILE *fp, char buffer)
{
    fclose(fp);
    remove(buffer);

    puts("Done, temp file closed and deleted.\n");
}

Thanks all for help who puts in time and effort to help me learn this language.