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/* signal.c: This file contains the signal routines for the ed line editor. */
/* ed line editor.
Copyright (C) 1993, 1994 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 1.9 1994/11/13 04:25:44 alm Exp $";
#endif
#include <setjmp.h>
#include <sys/ioctl.h>
#include "ed.h"
#ifndef SIG_ERR
# define SIG_ERR ((void (*)()) -1)
#endif /* !SIG_ERR */
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
}
extern long rows;
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
}
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