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From: "Tony Richardson" <richardson AT evansville DOT edu>
Subject:  Re: mkstemp bug
Date:  Wed, 27 Apr 2005 12:41:20 -0500
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Message-ID: <d4oilk$onv$1@sea.gmane.org>
References:  <usm1cb0aa DOT fsf AT gnu DOT org>
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I'm surprised your example doesn't segfault.  My Linux man page
says explicitly that the template should not be a string constant
but must be a character array, i.e. use

    char t1[] = "/tmp/clisp-x-io-XXXXXX";
    char t2[] = "/tmp/clisp-x-io-XXXXXX";
    char t3[] = "/tmp/clisp-x-io-XXXXXX";

    mkstemp(t1);
    mkstemp(t2);
    mkstemp(t3);

instead.

Tony Richardson

p.s. Don't use

    char *t1 = "/tmp/clisp-x-io-XXXXXX";

either.  It's not the same.  Constant strings like this and in your
original program can be stored in a read-only segment and so
are not necessarily writeable.

"Sam Steingold" wrote:
> Hi,
> it appears that mkstemp() returns a temp FD pointing to the same file:
> mkstemp ("/tmp/clisp-x-io-XXXXXX");
> ==> "/tmp/clisp-x-io-000592"
> mkstemp ("/tmp/clisp-x-io-XXXXXX");
> ==> "/tmp/clisp-x-io-000592"
> mkstemp ("/tmp/clisp-x-io-XXXXXX");
> ==> "/tmp/clisp-x-io-000592"




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