GCC: fclose() Error

[g sobers]

Greetings.

I seek assistance with a GCC-related source of error, which is illustrated with the help of sample code below:

1) FILE * f; 
2) f = fopen(argv[1], "r");
3) fclose(f);
4) FILE * f1;
5) f1 = fopen(argv[1], "r");
6) while ((c = fgetc(f)) != EOF){
...
...


As you will notice in the sequence of steps in the illustrative code above, in line 6 a fgetc() call to file 'f' is made instead of 'f1'. This situation, a cause of segmentation fault on a non-Cygwin machine, was not encountered by Cygin's gcc compiler. In fact, the code compiles and runs successfully on Cygwin.

Would appreciate assistance with addressing the situation.

Look forward to a prompt response.

Best regards,
Gaurav