Error on file open: File exists

Question

The return value of an open() was -1 and on trying to find the error using perror() the output was "File exists".

How do I find the error or the reason for the file not opening.

Answer 1

Looks like

EEXIST
pathname already exists and O_CREAT and O_EXCL were used.

Answer 2

You probably would have given the macro with the quotes as described below:

fd = open(filename,"O_RDONLY" );

It should be fd = open(filename,O_RDONLY); without quotes.