OK, fixed the undefined value problem (someone else had commented out one of my lines of code). Now the tail end of the strace output is 
read(5, "\n2002-02-28\0050.020\0050.020\0050.020\0050."..., 92) = 92
read(5, "\\\0\0?", 4)                   = 4
read(5, "\n2002-03-05\0050.020\0050.020\0050.020\0050."..., 92) = 92
read(5, "\1\0\0@", 4)                   = 4
read(5, "\376", 1)                      = 1
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
write(9, "# dograph version 12:51 2 Novemb"..., 4002) = 4002
close(9)                                = 0
munmap(0x2aac0000, 4096)                = 0
open("/var/MPL/tmp/dailyen/C/CYS04.gp", O_WRONLY|O_CREAT|O_TRUNC, 0666
+ <unfinished ...>
+++ killed by SIGSEGV +++

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Thoughts?

Update at 2222: Also tried changing the unless to an open .. || return .. in the extremely unlikely event that that would make a difference. No dice.

--t. alex

"There was supposed to be an earth-shattering kaboom!" --Marvin the Martian

In reply to Re: (2) Segmentation fault during file open by talexb
in thread Segmentation fault during file open by talexb

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