Using the open() system call

Question

I\'m writing a program that writes output to a file. If this file doesn\'t exist, I want to create it.

Currently, I\'m using the following flags when calling open: O

Answer 1

On Linux there's a third argument you can use to pass permissions. S_IWUSR should be the flag to give you write permissions, but in practice you'll probably want to use more flags than just that one (bitwise or'd together). Check the manpage for a list of the permission flags.