static char rcsid[] = "@(#)$Id: signals.c,v 5.13 1994/09/01 19:42:39 syd Exp $"; /******************************************************************************* * The Elm Mail System - $Revision: 5.13 $ $State: Exp $ * * Copyright (c) 1988-1992 USENET Community Trust * Copyright (c) 1986,1987 Dave Taylor ******************************************************************************* * Bug reports, patches, comments, suggestions should be sent to: * * Syd Weinstein, Elm Coordinator * elm@DSI.COM dsinc!elm * ******************************************************************************* * $Log: signals.c,v $ * Revision 5.13 1994/09/01 19:42:39 syd * Moved #defines for SETJMP & LONGJMP from src/editmsg.c to hdrs/defs.h and * used them instead of (set|long)jmp directly. This makes the usage consistent * and Solaris 2.3 behaves correctly w.r.t stop/continue. * From: Jan.Djarv@sa.erisoft.se (Jan Djarv) * * Revision 5.12 1994/08/30 18:59:38 syd * add sigcont to release list * * Revision 5.11 1994/08/30 18:27:47 syd * fix typo * * Revision 5.10 1994/08/30 18:16:05 syd * Fix up Solaris and SVR4 signal handling for timeout * From: Syd * * Revision 5.9 1993/08/03 19:10:50 syd * Patch for Elm 2.4 PL22 to correct handling of SIGWINCH signals on * DecStations with Ultrix 4.2. * The problem was that elm running in an xterm exits silently when the * window is resize. This was caused by incorrect signal handling for BSD. * From: vogt@isa.de * * Revision 5.8 1993/04/12 03:04:58 syd * The USR2 signal lost messages on some OS:es and did an unnecessary resync * on others. * From: Jan Djarv * * Revision 5.7 1993/01/20 03:43:37 syd * Some systems dont have SIGBUS, make it optional * * Revision 5.6 1992/12/11 02:39:53 syd * A try at making USR? not loose mailbox * * Revision 5.5 1992/12/07 02:41:21 syd * This implements the use of SIGUSR1 and SIGUSR2 as discussed on the * mailing list recently, and adds them to the documentation. * From: scs@lokkur.dexter.mi.us (Steve Simmons) * * Revision 5.4 1992/11/26 00:46:13 syd * changes to first change screen back (Raw off) and then issue final * error message. * From: Syd * * Revision 5.3 1992/10/27 01:43:40 syd * Move posix_signal to lib directory * From: tom@osf.org * * Revision 5.2 1992/10/25 02:01:58 syd * Here are the patches to support POSIX sigaction(). * From: tom@osf.org * * Revision 5.1 1992/10/03 22:58:40 syd * Initial checkin as of 2.4 Release at 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 "s_elm.h" extern int pipe_abort; /* set to TRUE if receive SIGPIPE */ SIGHAND_TYPE quit_signal(sig) { dprint(1, (debugfile, "\n\n** Received SIGQUIT **\n\n\n\n")); leave(0); } SIGHAND_TYPE hup_signal(sig) { dprint(1, (debugfile, "\n\n** Received SIGHUP **\n\n\n\n")); leave(0); } SIGHAND_TYPE term_signal(sig) { dprint(1, (debugfile, "\n\n** Received SIGTERM **\n\n\n\n")); leave(0); } SIGHAND_TYPE ill_signal(sig) { MoveCursor(LINES,0); Raw(OFF); dprint(1, (debugfile, "\n\n** Received SIGILL **\n\n\n\n")); printf(catgets(elm_msg_cat, ElmSet, ElmIllegalInstructionSignal, "\n\nIllegal Instruction signal!\n\n")); emergency_exit(); } SIGHAND_TYPE fpe_signal(sig) { MoveCursor(LINES,0); Raw(OFF); dprint(1, (debugfile, "\n\n** Received SIGFPE **\n\n\n\n")); printf(catgets(elm_msg_cat, ElmSet, ElmFloatingPointSignal, "\n\nFloating Point Exception signal!\n\n")); emergency_exit(); } #ifdef SIGBUS SIGHAND_TYPE bus_signal(sig) { MoveCursor(LINES,0); Raw(OFF); dprint(1, (debugfile, "\n\n** Received SIGBUS **\n\n\n\n")); printf(catgets(elm_msg_cat, ElmSet, ElmBusErrorSignal, "\n\nBus Error signal!\n\n")); emergency_exit(); } #endif SIGHAND_TYPE segv_signal(sig) { MoveCursor(LINES,0); Raw(OFF); dprint(1, (debugfile,"\n\n** Received SIGSEGV **\n\n\n\n")); printf(catgets(elm_msg_cat, ElmSet, ElmSegmentViolationSignal, "\n\nSegment Violation signal!\n\n")); emergency_exit(); } SIGHAND_TYPE alarm_signal(sig) { signal(SIGALRM, alarm_signal); /** silently process alarm signal for timeouts... **/ if (InGetPrompt) { #ifdef HASSIGHOLD sigrelse(SIGALRM); #endif LONGJMP(GetPromptBuf, 1); } } SIGHAND_TYPE pipe_signal(sig) { /** silently process pipe signal... **/ dprint(2, (debugfile, "*** received SIGPIPE ***\n\n")); pipe_abort = TRUE; /* internal signal ... wheeee! */ signal(SIGPIPE, pipe_signal); } #ifdef SIGTSTP int was_in_raw_state; SIGHAND_TYPE sig_user_stop(sig) { dprint(1, (debugfile,"\n\n** Received SIGTSTP **\n\n\n\n", sig)); /* This is called when the user presses a ^Z to stop the process within BSD */ #ifdef SIGTSTP signal(SIGTSTP, SIG_DFL); #endif was_in_raw_state = RawState(); Raw(OFF); /* turn it off regardless */ printf(catgets(elm_msg_cat, ElmSet, ElmStoppedUseFGToReturn, "\n\nStopped. Use \"fg\" to return to ELM\n\n")); kill(0, SIGSTOP); } SIGHAND_TYPE sig_return_from_user_stop(sig) { /** this is called when returning from a ^Z stop **/ dprint(1, (debugfile,"\n\n** Received SIGCONT **\n\n\n\n", sig)); signal(SIGCONT, sig_return_from_user_stop); signal(SIGTSTP, sig_user_stop); printf(catgets(elm_msg_cat, ElmSet, ElmBackInElmRedraw, "\nBack in ELM. (You might need to explicitly request a redraw.)\n\n")); if (was_in_raw_state) Raw(ON); if (InGetPrompt) { #ifdef HASSIGHOLD sigrelse(SIGTSTP); sigrelse(SIGCONT); #endif LONGJMP(GetPromptBuf, 1); } } #endif #ifdef SIGWINCH SIGHAND_TYPE winch_signal(sig) { resize_screen = 1; signal(SIGWINCH, winch_signal); if (InGetPrompt) { #ifdef HASSIGHOLD sigrelse(SIGWINCH); #endif LONGJMP(GetPromptBuf, 1); } } #endif SIGHAND_TYPE usr1_signal(sig) { dprint(1, (debugfile, "\n\n** Received SIGUSR1 **\n\n\n\n")); question_me = FALSE; while ( leave_mbox(TRUE, FALSE, TRUE) == -1) newmbox(cur_folder, TRUE); leave(0); } SIGHAND_TYPE usr2_signal(sig) { dprint(1, (debugfile, "\n\n** Received SIGUSR2 **\n\n\n\n")); while ( leave_mbox(FALSE, TRUE, FALSE) == -1) newmbox(cur_folder, TRUE); leave(0); }