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From: jos@bull.nl (Jos Vos)
Subject: Re: Ghostscript 2.5.2 dies with floating point exceptions
Message-ID: <C4LB1I.3oy@bull.nl>
Keywords: Ghostscript floating point exception
Sender: news@bull.nl (USENET Administrator Bull Netherlands)
Nntp-Posting-Host: spar.bull.nl
Organization: Bull, P.O. Box 22859, NL-1100 DJ Amsterdam, The Netherlands
References: <cproto.733031902@marsh>
Date: Sun, 28 Mar 1993 08:17:41 GMT
Lines: 73
cproto@cs.curtin.edu.au (Computer Protocol) writes:
>I ported Ghostscript 2.5.2 to 386bsd-0.1 (with most patches installed)
>without any problems. If I run the executable it dies with a floating
>point exception. Unfortunately the signal is delivered much after the
>event. Because of this gdb is not reporting the error at the right
>source line. I narrowed the fault down to a single function but when
>I try to single step through it, then the kernel panics. The reason
>might be that two signals are caused at the same time, i.e. the SIGFPE
>and the SIGTRAP.
I have a similar problem on my Bull System V system! When I first
reported the problem, I was the only one having a problem.
>1. Has anybody found the reason for the FPE in Ghostscript?
I have traced the 68040 assembler code, and it seems that our
(Greenhills) compiler generates some floating-point code at
routine entry-time.
>2. Has anybody fixed the delayed delivery of SIGFPEs?
I now just ignore the SIGFPE and print the # signals when the programs stops:
-----CUT HERE-----
*** gp_unix.c- Sun Nov 1 11:32:11 1992
--- gp_unix.c Sun Nov 1 11:53:54 1992
***************
*** 30,45 ****
--- 30,68 ----
extern FILE *popen();
extern int pclose();
+ #ifdef BULLBOS2
+
+ static int nfpe = 0;
+
+ #include <signal.h>
+
+ private void
+ handleFPE()
+ {
+ nfpe++;
+ signal(SIGFPE, handleFPE);
+ }
+
+ #endif /* BULLBOS2 */
+
/* Do platform-dependent initialization. */
void
gp_init()
{
+ #ifdef BULLBOS2
+ signal(SIGFPE, handleFPE);
+ #endif /* BULLBOS2 */
}
/* Do platform-dependent cleanup. */
void
gp_exit()
{
+ #ifdef BULLBOS2
+ if (nfpe > 0)
+ fprintf(stderr,
+ "Warning: %d floating point exceptions ignored.\n", nfpe);
+ #endif /* BULLBOS2 */
}
/* ------ Date and time ------ */
-----CUT HERE-----
--
-- Jos Vos <jos@bull.nl> (UUCP: ...!{uunet,mcsun,sun4nl}!nlbull!jos)
-- Bull Netherlands, Professional Services, Amsterdam, The Netherlands