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To: postgres@postgres.Berkeley.EDU
Subject: putenv in postmaster.c
Date: Sat, 08 Jul 1995 16:13:07 -53000
From: Shreeniwas N Sapre <sns@asterix.cs.unipune.ernet.in>
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Resent-Date: Sat, 08 Jul 95 11:54:39 -0700
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The use of putenv in postmaster.c (sample below) has crashed
postmaster on our system (DGUX 5.4R2.10). The symptom is its inability
to find "template1" after servicing the first 2 or 3 requests. My
diagnosis is the use of envEntry ( which is on stack) for putenv
causing corrupted environment entries, as putenv keeps a pointer to
the string and not a copy of the string. This problem surfaced after
we made a few changes (unrelated to this problem) to postmaster. We
have made envEntry as "static" as a solution.

Sample Code: 
BackendStartup(packet, port)
...
{
    char		envEntry[4][2 * ARGV_SIZE];
    
......
    sprintf(envEntry[0], "POSTPORT=%d", PostPortName);
    putenv(envEntry[0]);
...... Similar code here.
......
}
------
===========================================================================
Shreeniwas N. Sapre         |E-Mail: sns@cs.unipune.ernet.in
Phone : +91-212-357812(Off) | Snail: Department of Computer Science,
Fax   : +91-212-353899(Off) |        University of Poona, Pune 411007, INDIA
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