84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
265 lines
4.6 KiB
C
265 lines
4.6 KiB
C
/* $NetBSD: signal.c,v 1.4 2013/09/04 19:44:21 tron Exp $ */
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/*
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* Copyright (C) 1984-2012 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines dealing with signals.
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*
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* A signal usually merely causes a bit to be set in the "signals" word.
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* At some convenient time, the mainline code checks to see if any
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* signals need processing by calling psignal().
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* If we happen to be reading from a file [in iread()] at the time
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* the signal is received, we call intread to interrupt the iread.
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*/
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#include "less.h"
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#include <signal.h>
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/*
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* "sigs" contains bits indicating signals which need to be processed.
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*/
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public int sigs;
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static RETSIGTYPE u_interrupt __P((int));
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static RETSIGTYPE stop __P((int));
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#if MSDOS_COMPILER==WIN32C
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static BOOL WINAPI wbreak_handler __P((DWORD));
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#endif
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extern int sc_width, sc_height;
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extern int screen_trashed;
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extern int lnloop;
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extern int linenums;
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extern int wscroll;
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extern int reading;
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extern int quit_on_intr;
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extern long jump_sline_fraction;
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/*
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* Interrupt signal handler.
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*/
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/* ARGSUSED*/
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static RETSIGTYPE
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u_interrupt(type)
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int type;
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{
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bell();
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#if OS2
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LSIGNAL(SIGINT, SIG_ACK);
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#endif
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LSIGNAL(SIGINT, u_interrupt);
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sigs |= S_INTERRUPT;
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#if MSDOS_COMPILER==DJGPPC
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/*
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* If a keyboard has been hit, it must be Ctrl-C
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* (as opposed to Ctrl-Break), so consume it.
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* (Otherwise, Less will beep when it sees Ctrl-C from keyboard.)
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*/
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if (kbhit())
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getkey();
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#endif
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if (reading)
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intread(); /* May longjmp */
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}
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#ifdef SIGTSTP
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/*
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* "Stop" (^Z) signal handler.
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*/
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/* ARGSUSED*/
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static RETSIGTYPE
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stop(type)
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int type;
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{
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LSIGNAL(SIGTSTP, stop);
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sigs |= S_STOP;
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if (reading)
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intread();
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}
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#endif
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#ifdef SIGWINCH
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/*
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* "Window" change handler
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*/
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/* ARGSUSED*/
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public RETSIGTYPE
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winch(type)
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int type;
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{
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LSIGNAL(SIGWINCH, winch);
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sigs |= S_WINCH;
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if (reading)
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intread();
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}
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#else
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#ifdef SIGWIND
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/*
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* "Window" change handler
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*/
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/* ARGSUSED*/
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public RETSIGTYPE
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winch(type)
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int type;
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{
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LSIGNAL(SIGWIND, winch);
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sigs |= S_WINCH;
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if (reading)
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intread();
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}
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#endif
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#endif
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#if MSDOS_COMPILER==WIN32C
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/*
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* Handle CTRL-C and CTRL-BREAK keys.
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*/
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#include "windows.h"
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static BOOL WINAPI
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wbreak_handler(dwCtrlType)
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DWORD dwCtrlType;
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{
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switch (dwCtrlType)
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{
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case CTRL_C_EVENT:
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case CTRL_BREAK_EVENT:
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sigs |= S_INTERRUPT;
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return (TRUE);
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default:
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break;
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}
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return (FALSE);
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}
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#endif
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/*
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* Set up the signal handlers.
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*/
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public void
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init_signals(on)
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int on;
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{
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if (on)
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{
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/*
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* Set signal handlers.
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*/
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(void) LSIGNAL(SIGINT, u_interrupt);
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#if MSDOS_COMPILER==WIN32C
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SetConsoleCtrlHandler(wbreak_handler, TRUE);
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#endif
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#ifdef SIGTSTP
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(void) LSIGNAL(SIGTSTP, stop);
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#endif
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#ifdef SIGWINCH
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(void) LSIGNAL(SIGWINCH, winch);
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#endif
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#ifdef SIGWIND
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(void) LSIGNAL(SIGWIND, winch);
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#endif
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#ifdef SIGQUIT
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(void) LSIGNAL(SIGQUIT, SIG_IGN);
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#endif
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} else
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{
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/*
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* Restore signals to defaults.
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*/
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(void) LSIGNAL(SIGINT, SIG_DFL);
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#if MSDOS_COMPILER==WIN32C
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SetConsoleCtrlHandler(wbreak_handler, FALSE);
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#endif
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#ifdef SIGTSTP
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(void) LSIGNAL(SIGTSTP, SIG_DFL);
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#endif
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#ifdef SIGWINCH
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(void) LSIGNAL(SIGWINCH, SIG_IGN);
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#endif
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#ifdef SIGWIND
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(void) LSIGNAL(SIGWIND, SIG_IGN);
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#endif
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#ifdef SIGQUIT
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(void) LSIGNAL(SIGQUIT, SIG_DFL);
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#endif
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}
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}
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/*
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* Process any signals we have received.
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* A received signal cause a bit to be set in "sigs".
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*/
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public void
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psignals()
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{
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register int tsignals;
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if ((tsignals = sigs) == 0)
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return;
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sigs = 0;
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#ifdef SIGTSTP
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if (tsignals & S_STOP)
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{
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/*
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* Clean up the terminal.
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*/
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#ifdef SIGTTOU
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LSIGNAL(SIGTTOU, SIG_IGN);
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#endif
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clear_bot();
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deinit();
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flush();
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raw_mode(0);
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#ifdef SIGTTOU
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LSIGNAL(SIGTTOU, SIG_DFL);
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#endif
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LSIGNAL(SIGTSTP, SIG_DFL);
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kill(getpid(), SIGTSTP);
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/*
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* ... Bye bye. ...
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* Hopefully we'll be back later and resume here...
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* Reset the terminal and arrange to repaint the
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* screen when we get back to the main command loop.
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*/
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LSIGNAL(SIGTSTP, stop);
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raw_mode(1);
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init();
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screen_trashed = 1;
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tsignals |= S_WINCH;
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}
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#endif
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#ifdef S_WINCH
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if (tsignals & S_WINCH)
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{
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int old_width, old_height;
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/*
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* Re-execute scrsize() to read the new window size.
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*/
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old_width = sc_width;
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old_height = sc_height;
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get_term();
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if (sc_width != old_width || sc_height != old_height)
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{
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wscroll = (sc_height + 1) / 2;
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calc_jump_sline();
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calc_shift_count();
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screen_trashed = 1;
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}
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}
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#endif
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if (tsignals & S_INTERRUPT)
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{
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if (quit_on_intr)
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quit(QUIT_INTERRUPT);
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}
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}
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