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From:	HARY <Hary AT address DOT is DOT invalid>
Newsgroups:	comp.os.msdos.djgpp
Subject:	SIGWINCH and SIGPIPE
Date:	Sun, 30 Dec 2001 13:10:14 +0000 (UTC)
Organization:	Wielki samotnik w swoim zamku.
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi,

I was trying to compile some UNIX program.

Compiler gives an error message "`SIGWINCH' undeclared " for the
following code fragment:

--[cut]--
void signal_handler ()
{
  signal (SIGINT, handle_crash);        /* handle ^C */
  signal (SIGTERM, handle_crash);        /* handle soft kill */
  signal (SIGSEGV, handle_crash);        /* handle seg. fault */
  signal (SIGHUP, handle_crash);        /* handle hup signal */
  signal (SIGWINCH, handle_window_resize);
  sigblock (sigmask (SIGPIPE));        /* block broken pipe signal */
}
--[/cut]--

When I defined SIGWINCH with '-DSIGWINCH=301' (just to see if it
compiles) the message was:

signal_h.c:36: warning: left shift count >= width of type

coming from line:

sigblock (sigmask (SIGPIPE));

'sigblock' and 'sigmask' are defined in header file as follows:

--[cut]--
#ifndef sigmask
/* from bash */
#define sigmask(x) (1 << ((x)-1))
/* from glibc */
/* #define sigmask(sig)  (((sigset_t) 1) << ((sig) - 1)) */
#endif /* HAVE_SIGMASK */

#ifndef HAVE_SIGBLOCK
int sigblock (int mask);
#endif /* HAVE_SIGBLOCK */
--[/cut]--
 
Here are my questions:

1. Why isn't SIGWINCH defined in djgpp, may be even as some meaningless
value, to make porting easier?

2. How should I modify code to compile it? Is SIGPIPE handling needed
under DOS/Win or can I simply remove it?

Thanks in advance,

  HARY

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