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Diffstat (limited to 'texinfo/info/signals.c')
| -rw-r--r-- | texinfo/info/signals.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/texinfo/info/signals.c b/texinfo/info/signals.c deleted file mode 100644 index b93a585f567..00000000000 --- a/texinfo/info/signals.c +++ /dev/null @@ -1,172 +0,0 @@ -/* signals.c -- Install and maintain Info signal handlers. */ - -/* This file is part of GNU Info, a program for reading online documentation - stored in Info format. - - Copyright (C) 1993, 1994, 1995 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. - - Written by Brian Fox (bfox@ai.mit.edu). */ - -#include "info.h" -#include "signals.h" - -/* **************************************************************** */ -/* */ -/* 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 (operation, newset, oldset) - int operation, *newset, *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 */ -/* */ -/* **************************************************************** */ - -typedef RETSIGTYPE signal_handler (); - -static RETSIGTYPE info_signal_handler (); -static signal_handler *old_TSTP, *old_TTOU, *old_TTIN; -static signal_handler *old_WINCH, *old_INT; - -void -initialize_info_signal_handler () -{ -#if defined (SIGTSTP) - old_TSTP = (signal_handler *) signal (SIGTSTP, info_signal_handler); - old_TTOU = (signal_handler *) signal (SIGTTOU, info_signal_handler); - old_TTIN = (signal_handler *) signal (SIGTTIN, info_signal_handler); -#endif /* SIGTSTP */ - -#if defined (SIGWINCH) - old_WINCH = (signal_handler *) signal (SIGWINCH, info_signal_handler); -#endif - -#if defined (SIGINT) - old_INT = (signal_handler *) signal (SIGINT, info_signal_handler); -#endif -} - -static void -redisplay_after_signal () -{ - 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 RETSIGTYPE -info_signal_handler (sig) - int sig; -{ - signal_handler **old_signal_handler; - - switch (sig) - { -#if defined (SIGTSTP) - case SIGTSTP: - case SIGTTOU: - case SIGTTIN: -#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 (sig == SIGINT) - old_signal_handler = &old_INT; - - /* 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 (); - signal (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 (); - *old_signal_handler = (signal_handler *) signal (sig, info_signal_handler); - redisplay_after_signal (); - fflush (stdout); - } - break; - -#if defined (SIGWINCH) - case SIGWINCH: - { - /* Turn off terminal IO, tell our parent that the window has changed, - then reinitialize the terminal and rebuild our windows. */ - old_signal_handler = &old_WINCH; - terminal_goto_xy (0, 0); - fflush (stdout); - terminal_unprep_terminal (); - signal (sig, *old_signal_handler); - UNBLOCK_SIGNAL (sig); - kill (getpid (), sig); - - /* After our old signal handler returns... */ - terminal_get_screen_size (); - terminal_prep_terminal (); - display_initialize_display (screenwidth, screenheight); - window_new_screen_size (screenwidth, screenheight, (VFunction *)NULL); - *old_signal_handler = (signal_handler *) signal (sig, info_signal_handler); - redisplay_after_signal (); - } - break; -#endif /* SIGWINCH */ - } -} |