Category : C Source Code
Archive   : ELM23SRC.ZIP
Filename : SIGNALS.C

static char rcsid[] = "@(#)$Id: signals.c,v 4.1 90/04/28 22:44:10 syd Exp $";

/*******************************************************************************
* The Elm Mail System - $Revision: 4.1 $ $State: Exp $
*
* Copyright (c) 1986, 1987 Dave Taylor
* Copyright (c) 1988, 1989, 1990 USENET Community Trust
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* [email protected] dsinc!elm
*
*******************************************************************************
* $Log: signals.c,v $
* Revision 4.1 90/04/28 22:44:10 syd
* checkin of Elm 2.3 as of Release PL0
*
*
******************************************************************************/

/** This set of routines traps various signals and informs the
user of the error, leaving the program in a nice, graceful
manner.

**/

#include "headers.h"
#include

#ifdef VOIDSIG
typedef void sighan_type;
#else
typedef int sighan_type;
#endif

extern int pipe_abort; /* set to TRUE if receive SIGPIPE */

sighan_type
quit_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGQUIT **\n\n\n\n"));
leave();
}

sighan_type
hup_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGHUP **\n\n\n\n"));
leave();
}

sighan_type
term_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGTERM **\n\n\n\n"));
leave();
}

sighan_type
ill_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGILL **\n\n\n\n"));
PutLine0(LINES, 0, "\n\nIllegal Instruction signal!\n\n");
emergency_exit();
}

sighan_type
fpe_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGFPE **\n\n\n\n"));
PutLine0(LINES, 0,"\n\nFloating Point Exception signal!\n\n");
emergency_exit();
}

sighan_type
bus_signal()
{
dprint(1, (debugfile, "\n\n** Received SIGBUS **\n\n\n\n"));
PutLine0(LINES, 0,"\n\nBus Error signal!\n\n");
emergency_exit();
}

sighan_type
segv_signal()
{
dprint(1, (debugfile,"\n\n** Received SIGSEGV **\n\n\n\n"));
PutLine0(LINES, 0,"\n\nSegment Violation signal!\n\n");
emergency_exit();
}

sighan_type
alarm_signal()
{
/** silently process alarm signal for timeouts... **/
#if defined(BSD) || defined(OS2)
if (InGetPrompt)
longjmp(GetPromptBuf, 1);
#ifdef OS2
signal(SIGALRM, SIG_ACK);
signal(SIGALRM, alarm_signal);
#endif
#else
signal(SIGALRM, alarm_signal);
#endif
}

sighan_type
pipe_signal()
{
/** silently process pipe signal... **/
dprint(2, (debugfile, "*** received SIGPIPE ***\n\n"));

pipe_abort = TRUE; /* internal signal ... wheeee! */
#ifndef OS2
signal(SIGPIPE, pipe_signal);
#endif
}

#ifdef SIGTSTP
int was_in_raw_state;

sighan_type
sig_user_stop()
{
/* This is called when the user presses a ^Z to stop the
process within BSD
*/
if (signal(SIGTSTP, SIG_DFL) != SIG_DFL)
signal(SIGTSTP, SIG_DFL);

was_in_raw_state = RawState();
Raw(OFF); /* turn it off regardless */

printf("\n\nStopped. Use \"fg\" to return to ELM\n\n");

kill(0, SIGSTOP);
}

sighan_type
sig_return_from_user_stop()
{
/** this is called when returning from a ^Z stop **/

if (signal(SIGTSTP, sig_user_stop) == SIG_DFL)
signal(SIGTSTP, sig_user_stop);

printf(
"\nBack in ELM. (You might need to explicitly request a redraw.)\n\n");

if (was_in_raw_state)
Raw(ON);

#ifdef BSD
if (InGetPrompt)
longjmp(GetPromptBuf, 1);
#endif
}
#endif