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- /* signal.c: This file contains the signal routines for the ed line editor. */
- /* ed line editor.
- Copyright (C) 1993 Andrew Moore, Talke Studio
- All Rights Reserved
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #ifndef lint
- static char *rcsid = "@(#)$Id: signal.c,v 1.4 1994/03/19 03:25:17 alm Exp $";
- #endif
-
-
- #include <setjmp.h>
-
- #include "ed.h"
-
-
- void
- (*reliable_signal (sno, hndlr)) ()
- int sno;
- void (*hndlr) ();
- {
- #ifndef HAVE_SIGACTION
- signal (sno, hndlr);
- #else
- struct sigaction sa, osa;
-
- sa.sa_handler = hndlr;
- sigemptyset (&sa.sa_mask);
- sa.sa_flags = 0;
- #ifdef SA_RESTART
- sa.sa_flags |= SA_RESTART;
- #endif
- return (sigaction (sno, &sa, &osa) < 0) ? SIG_ERR : osa.sa_handler;
- #endif /* HAVE_SIGACTION */
- }
-
-
- void
- signal_hup (signo)
- int signo;
- {
- if (mutex)
- sigflags |= (1 << (signo - 1));
- else
- handle_hup (signo);
- }
-
-
- void
- signal_int (signo)
- int signo;
- {
- if (mutex)
- sigflags |= (1 << (signo - 1));
- else
- handle_int (signo);
- }
-
-
- #ifdef HAVE_SIGSETJMP
- extern sigjmp_buf env;
- #else
- extern jmp_buf env;
- #endif
- extern int sigactive;
-
- void
- handle_hup (signo)
- int signo;
- {
- char *hup = NULL; /* hup filename */
- char *s;
- int n;
-
- if (!sigactive)
- quit (1);
- sigflags &= ~(1 << (signo - 1));
- if (addr_last && write_file ("ed.hup", "w", 1, addr_last) < 0 &&
- (s = getenv ("HOME")) != NULL &&
- (n = strlen (s)) + 7 <= PATH_MAX && /* "ed.hup" + '/' */
- (hup = (char *) malloc (n + 8)) != NULL)
- {
- strcpy (hup, s);
- if (n && hup[n - 1] != '/')
- hup[n++] = '/';
- strcpy (hup + n, "ed.hup");
- write_file (hup, "w", 1, addr_last);
- }
- quit (2);
- }
-
-
- void
- handle_int (signo)
- int signo;
- {
- if (!sigactive)
- quit (1);
- sigflags &= ~(1 << (signo - 1));
- #ifdef HAVE_SIGSETJMP
- siglongjmp (env, -1);
- #else
- longjmp (env, -1);
- #endif
- }
-
-
- int cols = 72; /* wrap column */
-
- void
- handle_winch (signo)
- int signo;
- {
- #ifdef TIOCGWINSZ
- struct winsize ws; /* window size structure */
- #endif
-
- sigflags &= ~(1 << (signo - 1));
- #ifdef TIOCGWINSZ
- if (ioctl (0, TIOCGWINSZ, (char *) &ws) >= 0)
- {
- if (ws.ws_row > 2)
- rows = ws.ws_row - 2;
- if (ws.ws_col > 8)
- cols = ws.ws_col - 8;
- }
- #endif
- }
-