Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!uunet!bria!mike
From: mike@bria.commodore.com
Newsgroups: comp.unix.questions
Subject: Re: File descriptors open info
Message-ID: <487@bria>
Date: 28 Feb 91 01:23:50 GMT
References: <1991Feb26.213145.26540@batcomputer.tn.cornell.edu>
Reply-To: uunet!bria!mike
Organization: MGI Group International, Los Angeles, CA
Lines: 33
Followup-To:
Keywords:

In an article, theory.tn.cornell.edu!hurf (Hurf Sheldon) writes:
>is there a Unix system call (or some other method) for
>finding out how many file descriptors a process has
>open?

Well, the *real* way to do this is to go munging through the kernel's
process table. :-)

Actually, you could do something like this:

	#define MAXFD	100	/* or some reasonable number */

	getnumfd()
	{
	int i = 0, num = 0;
	struct stat buf;

		while ( i < MAXFD )
			if ( fstat(i++,&buf) == 0 )
				++num;

		return num;
	}

Kind of ugly, but it could get the job done.  The only drawback is that
the MAXFD value may be unrealistic after a few "relinkings of the kernel."

Cheers,
-- 
Michael Stefanik, MGI Inc., Los Angeles| Opinions stated are not even my own.
Title of the week: Systems Engineer    | UUCP: ...!uunet!bria!mike
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