2 * Copyright (C) 1984-2009 Mark Nudelman
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
13 * Routines dealing with signals.
15 * A signal usually merely causes a bit to be set in the "signals" word.
16 * At some convenient time, the mainline code checks to see if any
17 * signals need processing by calling psignal().
18 * If we happen to be reading from a file [in iread()] at the time
19 * the signal is received, we call intread to interrupt the iread.
26 * "sigs" contains bits indicating signals which need to be processed.
30 extern int sc_width
, sc_height
;
31 extern int screen_trashed
;
36 extern int quit_on_intr
;
37 extern long jump_sline_fraction
;
40 * Interrupt signal handler.
49 LSIGNAL(SIGINT
, SIG_ACK
);
51 LSIGNAL(SIGINT
, u_interrupt
);
53 #if MSDOS_COMPILER==DJGPPC
55 * If a keyboard has been hit, it must be Ctrl-C
56 * (as opposed to Ctrl-Break), so consume it.
57 * (Otherwise, Less will beep when it sees Ctrl-C from keyboard.)
63 intread(); /* May longjmp */
68 * "Stop" (^Z) signal handler.
75 LSIGNAL(SIGTSTP
, stop
);
84 * "Window" change handler
91 LSIGNAL(SIGWINCH
, winch
);
99 * "Window" change handler
106 LSIGNAL(SIGWIND
, winch
);
114 #if MSDOS_COMPILER==WIN32C
116 * Handle CTRL-C and CTRL-BREAK keys.
121 wbreak_handler(dwCtrlType
)
127 case CTRL_BREAK_EVENT
:
138 * Set up the signal handlers.
147 * Set signal handlers.
149 (void) LSIGNAL(SIGINT
, u_interrupt
);
150 #if MSDOS_COMPILER==WIN32C
151 SetConsoleCtrlHandler(wbreak_handler
, TRUE
);
154 (void) LSIGNAL(SIGTSTP
, stop
);
157 (void) LSIGNAL(SIGWINCH
, winch
);
160 (void) LSIGNAL(SIGWIND
, winch
);
163 (void) LSIGNAL(SIGQUIT
, SIG_IGN
);
168 * Restore signals to defaults.
170 (void) LSIGNAL(SIGINT
, SIG_DFL
);
171 #if MSDOS_COMPILER==WIN32C
172 SetConsoleCtrlHandler(wbreak_handler
, FALSE
);
175 (void) LSIGNAL(SIGTSTP
, SIG_DFL
);
178 (void) LSIGNAL(SIGWINCH
, SIG_IGN
);
181 (void) LSIGNAL(SIGWIND
, SIG_IGN
);
184 (void) LSIGNAL(SIGQUIT
, SIG_DFL
);
190 * Process any signals we have received.
191 * A received signal cause a bit to be set in "sigs".
196 register int tsignals
;
198 if ((tsignals
= sigs
) == 0)
203 if (tsignals
& S_STOP
)
206 * Clean up the terminal.
209 LSIGNAL(SIGTTOU
, SIG_IGN
);
216 LSIGNAL(SIGTTOU
, SIG_DFL
);
218 LSIGNAL(SIGTSTP
, SIG_DFL
);
219 kill(getpid(), SIGTSTP
);
222 * Hopefully we'll be back later and resume here...
223 * Reset the terminal and arrange to repaint the
224 * screen when we get back to the main command loop.
226 LSIGNAL(SIGTSTP
, stop
);
234 if (tsignals
& S_WINCH
)
236 int old_width
, old_height
;
238 * Re-execute scrsize() to read the new window size.
240 old_width
= sc_width
;
241 old_height
= sc_height
;
243 if (sc_width
!= old_width
|| sc_height
!= old_height
)
245 wscroll
= (sc_height
+ 1) / 2;
252 if (tsignals
& S_INTERRUPT
)