File locking

[darren@example.com (Darren Cook)]

What is the best way to do file locking, in a C program, on Unix machines?
Under DOS/Windows, I use locking().
This was missing under Linux (GNU C), so I used flock().
Unfortunately, both locking and flock seem to be missing on a Sun SparcCompiler!
The GNU man pages say flock is implemented with fcntl, so is fcntl the most
portable solution?

Darren