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From: allbery@NCoast.ORG (Brandon S. Allbery KB8JRR/KT)
Newsgroups: comp.unix.internals
Subject: Re: Is it possible to get filename from file descriptor ?
Message-ID: <1990Sep17.170603.27144@NCoast.ORG>
Date: 17 Sep 90 17:06:03 GMT
References: <870@gtenmc.UUCP>
Reply-To: allbery@ncoast.ORG (Brandon S. Allbery KB8JRR/KT)
Followup-To: comp.unix.internals
Organization: North Coast Public Access *NIX, Cleveland, OH
Lines: 32

As quoted from <870@gtenmc.UUCP> by kumar@gtenmc.UUCP (S.Kumar):
+---------------
|     (This would be very useful to me to find out the filename which
|     tmpfile() has created which I could then pass to other programs)
+---------------

Someone else answered your question; I'll address this.

You're doing this wrong....

(1) tmpfile() creates a named file, then unlinks it.  By the time you get
    control back from tmpfile(), the file it creates doesn't *have* a name.

(2) In any case, what you want is bass-ackwards.  You have to do major work to
    get the filename from a file descriptor (that is, if it *has* one; pipes,
    un-"bind"-ed (AF_UNIX) sockets, etc. need not apply).  It's much easier to
    do it in the proper order:

		char tf_name[L_tmpnam];
		FILE *tf_fp;

		tmpnam(tf_name);
		tf_fp = fopen(tf_name, "w");

    Much easier, no?

++Brandon
-- 
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