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NetBSD/gnu/dist/texinfo/info/signals.c
wiz ccaa2ac97b Import of texinfo-4.7, as prepared by texinfo2netbsd. 
Changes since 4.6:

4.7 (9 April 2004)
* Language:
  . new commands @float, @caption, @shortcaption, @listoffloats for
    initial implementation of floating material (figures, tables, etc).
    Ironically, they do not yet actually float anywhere.
  . new commands @docbook, @ifdocbook, @ifnotdocbook for conditional Docbook.
  . new commands @ordf{} and @ordm{} for Spanish feminine/masculine ordinals.
  . new commands @deftypecv[x] for class variables in typed OO languages.
  . new command @registeredsymbol for the r-in-a-circle symbol.
  . new command @headitem to make a heading row in @multitable.
  . new command @LaTeX{} for the LaTeX logo.
  . new command @comma{} to avoid comma-parsing problems.
  . @url is now a synonym for @uref; new command @indicateurl has the
    old meaning of just displaying a url as text.
  . @quotation now accepts an optional argument for labelling the text
      as a `Note', `Tip', etc.
  . @defun (et al.) heading lines can now be continued with a lone @.
  . @acronym accepts an optional argument for the meaning of the acronym.
* makeinfo:
  . New environment variable TEXINFO_OUTPUT_FORMAT determines the output
    format at runtime, if no options are specified.
  . New option --plaintext, equivalent to --no-headers with Info output.
  . All outputs:
    - sections are numbered by default.
  . Info output:
    - punctuation is inserted after @pxref and @ref, if needed to make
      cross-references valid.
    - line numbers included in index menus, so Info readers can go to
      the exact line of an entry, not just a node.  Also in plaintext output.
    - ^@^H[index^@^H] cookie included in index menus, so Info readers
      can handle the ] etc. commands better.
  . HTML output:
    - new algorithm for cross-references to other manuals, for maximum
      portability and stability.
    - include node name in <title> with split output.
    - @multicolumn fractions become percentages.
    - entities used for bullets, quotes, dashes, and others.
    - index entries are links to the exact locations.
    - <h4> and <h5> used for @sub and @subsubsections again.
    - accented dotless i supported.
  . XML output: many new tags and structure to preserve more source features.
  . Docbook output:
    - upgraded DTD to Docbook XML 4.2, no longer using Docbook SGML.
    - improved translation in general, for instance:
    - line annotations and marked quotations.
* texi2dvi:
  . if available, use etex (pdfetex if --pdf) by default.
  . if the input file includes thumbpdf.sty (for LaTeX), then run thumbpdf.
  . more output if --debug.
* texinfo.tex:
  . @defun names are now printed in typewriter (instead of bold), and
    within the arguments, @var text is printed in slanted typewriter.
  . @tex code is executed inside a TeX group, so that any changes must
    be prefixed with \global (or the equivalent) to be effective.  (This
    change was actually made years ago, but never made it into the NEWS.)
* info:
  . new option --where (aka --location, -w) to report where an Info file
    would be found, instead of reading it.
  . by default, output ANSI terminal escape sequences as-is; new option
    --no-raw-escapes overrides this.
  . use the newly-generated index line numbers.
* Distribution:
  . new script gendocs.sh (not installed), for use by GNU maintainers in
    getting their manuals on the GNU web site.  Documented in
    maintain.texi (http://www.gnu.org/prep/maintain_toc.html).
  . Most code uses ANSI C prototypes, to some extent.
  . New translation: nb.
  . automake 1.8.3, autoconf 2.59, gettext 0.14.1.
2004-07-12 23:26:33 +00:00

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/* $NetBSD: signals.c,v 1.1.1.5 2004/07/12 23:26:53 wiz Exp $ */
/* signals.c -- install and maintain signal handlers.
Id: signals.c,v 1.4 2004/03/27 16:19:09 karl Exp
Copyright (C) 1993, 1994, 1995, 1998, 2002, 2003, 2004 Free Software
Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Originally written by Brian Fox (bfox@ai.mit.edu). */
#include "info.h"
#include "signals.h"
void initialize_info_signal_handler (void);
/* **************************************************************** */
/* */
/* Pretending That We Have POSIX Signals */
/* */
/* **************************************************************** */
#if !defined (HAVE_SIGPROCMASK) && defined (HAVE_SIGSETMASK)
/* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */
static void
sigprocmask (int operation, int *newset, int *oldset)
{
switch (operation)
{
case SIG_UNBLOCK:
sigsetmask (sigblock (0) & ~(*newset));
break;
case SIG_BLOCK:
*oldset = sigblock (*newset);
break;
case SIG_SETMASK:
sigsetmask (*newset);
break;
default:
abort ();
}
}
#endif /* !HAVE_SIGPROCMASK && HAVE_SIGSETMASK */
/* **************************************************************** */
/* */
/* Signal Handling for Info */
/* */
/* **************************************************************** */
#if defined (HAVE_SIGACTION) || defined (HAVE_SIGPROCMASK) ||\
defined (HAVE_SIGSETMASK)
static void
mask_termsig (sigset_t *set)
{
# if defined (SIGTSTP)
sigaddset (set, SIGTSTP);
sigaddset (set, SIGTTOU);
sigaddset (set, SIGTTIN);
# endif
# if defined (SIGWINCH)
sigaddset (set, SIGWINCH);
# endif
#if defined (SIGQUIT)
sigaddset (set, SIGQUIT);
#endif
#if defined (SIGINT)
sigaddset (set, SIGINT);
#endif
# if defined (SIGUSR1)
sigaddset (set, SIGUSR1);
# endif
}
#endif /* HAVE_SIGACTION || HAVE_SIGPROCMASK || HAVE_SIGSETMASK */
static RETSIGTYPE info_signal_proc (int sig);
#if defined (HAVE_SIGACTION)
typedef struct sigaction signal_info;
signal_info info_signal_handler;
static void
set_termsig (int sig, signal_info *old)
{
sigaction (sig, &info_signal_handler, old);
}
static void
restore_termsig (int sig, const signal_info *saved)
{
sigaction (sig, saved, NULL);
}
#else /* !HAVE_SIGACTION */
typedef RETSIGTYPE (*signal_info) ();
#define set_termsig(sig, old) (void)(*(old) = signal (sig, info_signal_proc))
#define restore_termsig(sig, saved) (void)signal (sig, *(saved))
#define info_signal_handler info_signal_proc
static int term_conf_busy = 0;
#endif /* !HAVE_SIGACTION */
static signal_info old_TSTP, old_TTOU, old_TTIN;
static signal_info old_WINCH, old_INT, old_USR1;
static signal_info old_QUIT;
void
initialize_info_signal_handler (void)
{
#ifdef SA_NOCLDSTOP
/* (Based on info from Paul Eggert found in coreutils.) Don't use
HAVE_SIGACTION to decide whether to use the sa_handler, sa_flags,
sa_mask members, as some systems (Solaris 7+) don't define them. Use
SA_NOCLDSTOP instead; it's been part of POSIX.1 since day 1 (in 1988). */
info_signal_handler.sa_handler = info_signal_proc;
info_signal_handler.sa_flags = 0;
mask_termsig (&info_signal_handler.sa_mask);
#endif /* SA_NOCLDSTOP */
#if defined (SIGTSTP)
set_termsig (SIGTSTP, &old_TSTP);
set_termsig (SIGTTOU, &old_TTOU);
set_termsig (SIGTTIN, &old_TTIN);
#endif /* SIGTSTP */
#if defined (SIGWINCH)
set_termsig (SIGWINCH, &old_WINCH);
#endif
#if defined (SIGQUIT)
set_termsig (SIGQUIT, &old_QUIT);
#endif
#if defined (SIGINT)
set_termsig (SIGINT, &old_INT);
#endif
#if defined (SIGUSR1)
/* Used by DJGPP to simulate SIGTSTP on Ctrl-Z. */
set_termsig (SIGUSR1, &old_USR1);
#endif
}
static void
redisplay_after_signal (void)
{
terminal_clear_screen ();
display_clear_display (the_display);
window_mark_chain (windows, W_UpdateWindow);
display_update_display (windows);
display_cursor_at_point (active_window);
fflush (stdout);
}
static void
reset_info_window_sizes (void)
{
terminal_goto_xy (0, 0);
fflush (stdout);
terminal_unprep_terminal ();
terminal_get_screen_size ();
terminal_prep_terminal ();
display_initialize_display (screenwidth, screenheight);
window_new_screen_size (screenwidth, screenheight);
redisplay_after_signal ();
}
static RETSIGTYPE
info_signal_proc (int sig)
{
signal_info *old_signal_handler = NULL;
#if !defined (HAVE_SIGACTION)
/* best effort: first increment this counter and later block signals */
if (term_conf_busy)
return;
term_conf_busy++;
#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
{
sigset_t nvar, ovar;
sigemptyset (&nvar);
mask_termsig (&nvar);
sigprocmask (SIG_BLOCK, &nvar, &ovar);
}
#endif /* HAVE_SIGPROCMASK || HAVE_SIGSETMASK */
#endif /* !HAVE_SIGACTION */
switch (sig)
{
#if defined (SIGTSTP)
case SIGTSTP:
case SIGTTOU:
case SIGTTIN:
#endif
#if defined (SIGQUIT)
case SIGQUIT:
#endif
#if defined (SIGINT)
case SIGINT:
#endif
{
#if defined (SIGTSTP)
if (sig == SIGTSTP)
old_signal_handler = &old_TSTP;
if (sig == SIGTTOU)
old_signal_handler = &old_TTOU;
if (sig == SIGTTIN)
old_signal_handler = &old_TTIN;
#endif /* SIGTSTP */
#if defined (SIGQUIT)
if (sig == SIGQUIT)
old_signal_handler = &old_QUIT;
#endif /* SIGQUIT */
#if defined (SIGINT)
if (sig == SIGINT)
old_signal_handler = &old_INT;
#endif /* SIGINT */
/* For stop signals, restore the terminal IO, leave the cursor
at the bottom of the window, and stop us. */
terminal_goto_xy (0, screenheight - 1);
terminal_clear_to_eol ();
fflush (stdout);
terminal_unprep_terminal ();
restore_termsig (sig, old_signal_handler);
UNBLOCK_SIGNAL (sig);
kill (getpid (), sig);
/* The program is returning now. Restore our signal handler,
turn on terminal handling, redraw the screen, and place the
cursor where it belongs. */
terminal_prep_terminal ();
set_termsig (sig, old_signal_handler);
/* window size might be changed while sleeping */
reset_info_window_sizes ();
}
break;
#if defined (SIGWINCH) || defined (SIGUSR1)
#ifdef SIGWINCH
case SIGWINCH:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
{
/* Turn off terminal IO, tell our parent that the window has changed,
then reinitialize the terminal and rebuild our windows. */
#ifdef SIGWINCH
if (sig == SIGWINCH)
old_signal_handler = &old_WINCH;
#endif
#ifdef SIGUSR1
if (sig == SIGUSR1)
old_signal_handler = &old_USR1;
#endif
terminal_goto_xy (0, 0);
fflush (stdout);
terminal_unprep_terminal (); /* needless? */
restore_termsig (sig, old_signal_handler);
UNBLOCK_SIGNAL (sig);
kill (getpid (), sig);
/* After our old signal handler returns... */
set_termsig (sig, old_signal_handler); /* needless? */
terminal_prep_terminal ();
reset_info_window_sizes ();
}
break;
#endif /* SIGWINCH || SIGUSR1 */
}
#if !defined (HAVE_SIGACTION)
/* at this time it is safer to perform unblock after decrement */
term_conf_busy--;
#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
{
sigset_t nvar, ovar;
sigemptyset (&nvar);
mask_termsig (&nvar);
sigprocmask (SIG_UNBLOCK, &nvar, &ovar);
}
#endif /* HAVE_SIGPROCMASK || HAVE_SIGSETMASK */
#endif /* !HAVE_SIGACTION */
}
/* vim: set sw=2 cino={1s>2sn-s^-se-s: */
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