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From: scyudits AT MIT DOT EDU
Message-ID: <1079660146.405a4e72c44f0@webmail.mit.edu>
Date: Thu, 18 Mar 2004 20:35:46 -0500
To: cygwin AT cygwin DOT com
Cc: scyudits AT MIT DOT EDU
Subject: seg fault on file write in cygwin, please help!!!
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Resent-Date: Thu, 18 Mar 2004 20:40:07 -0500
Resent-From: scyudits AT MIT DOT EDU
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Resent-Message-ID: <1079660407 DOT 405a4f77521f0 AT webmail DOT mit DOT edu>

Hi, 

I am getting the following seg fault at the point in my C++ code where data 
gets written to a file. 

First, here is the code that is the source of the problem (should be correct):

FILE *outfile = fopen("/home/Sophia/ns-allinone-2.27/ns-2.27/myfile.tcl", "w");
fprintf(outfile, "%s", output);

...where output is a regular string (character array). 

Here is the backtrace from the seg fault, on running this code:

(gdb) run
Starting program: /home/Sophia/ns-allinone-2.27/ns-2.27/a.exe

Program received signal SIGSEGV, Segmentation fault.
0x610cfaa9 in wmemset () from /usr/bin/cygwin1.dll
(gdb) backtrace
#0 0x610cfaa9 in wmemset () from /usr/bin/cygwin1.dll
#1 0x610cf9b4 in wmemset () from /usr/bin/cygwin1.dll
#2 0x610d365f in wmemset () from /usr/bin/cygwin1.dll
#3 0x61086751 in cygwin1!aclcheck () from /usr/bin/cygwin1.dll
#4 0x61005d05 in getprogname () from /usr/bin/cygwin1.dll
#5 0x0a0436c0 in ?? ()
#6 0x0a041318 in ?? ()
#7 0x00000001 in ?? ()
#8 0x00401236 in __do_sjlj_init()

What's going on, and how do I fix this?

Thanks,

Sophia


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