How to properly use flock()

I am making a call to flock() and getting the error
" warning: passing arg 1 of `flock' makes integer from pointer without a cast"
when I try to compile. I am running FreeBSD and using gcc.

Code:

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  flock(logfile,LOCK_EX);/*lock log file*/
  fputs("client logged in",logfile);
  flock(logfile,LOCK_UN);/*unlock log file*/

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logfile is declared like this

Code:

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FILE *logfile;

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this is my first time every using flock(), it seems like it would be much easier than using POSIX semaphores. Does anyone know why I am getting this error? The fputs() call does not give me any errors at compile time.

thanks in advance

Read the man page for it. Then actually call it right. It uses a file descriptor. A descriptor is not the same thing as a "FILE*".

Quzah.

sorry, I did read the man page for it, I just didn't catch that is was asking for a file descriptor.

is there anyway to get the file descriptor from the file pointer?

Quote:

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Originally posted by samps005
is there anyway to get the file descriptor from the file pointer?

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Do you need a file pointer? You could always use open instead. Or if you need a file pointer, I'm pretty sure there's a way to do it, but the function name escapes me at this time.

Quzah.

yeah, I need the file pointer most of my other code needs it. Does anyone else know of a function to get a file descriptor from a file pointer? Or maybe just another really simple way to lock a file?

stat() might help you
-luke