X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Ftty%2Flib_tstp.c;h=2a341fa6ba29c3252c36848d8f0286c056beeef7;hp=512de68dc5ff32bb90f1102cb41a2c74299b0636;hb=7b2974498fac39a3ffde257c92f572234d529239;hpb=c633e5103a29a38532cf1925257b91cea33fd090;ds=sidebyside diff --git a/ncurses/tty/lib_tstp.c b/ncurses/tty/lib_tstp.c index 512de68d..2a341fa6 100644 --- a/ncurses/tty/lib_tstp.c +++ b/ncurses/tty/lib_tstp.c @@ -1,5 +1,5 @@ /**************************************************************************** - * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc. * + * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * @@ -29,6 +29,7 @@ /**************************************************************************** * Author: Zeyd M. Ben-Halim 1992,1995 * * and: Eric S. Raymond * + * and: Thomas E. Dickey 1995-on * ****************************************************************************/ /* @@ -37,17 +38,15 @@ ** The routine _nc_signal_handler(). ** */ - #include -#include #include #if SVR4_ACTION && !defined(_POSIX_SOURCE) #define _POSIX_SOURCE #endif -MODULE_ID("$Id: lib_tstp.c,v 1.22 2000/09/02 18:33:17 tom Exp $") +MODULE_ID("$Id: lib_tstp.c,v 1.36 2007/04/21 19:51:29 tom Exp $") #if defined(SIGTSTP) && (HAVE_SIGACTION || HAVE_SIGVEC) #define USE_SIGTSTP 1 @@ -55,6 +54,41 @@ MODULE_ID("$Id: lib_tstp.c,v 1.22 2000/09/02 18:33:17 tom Exp $") #define USE_SIGTSTP 0 #endif +#ifdef TRACE +static const char * +signal_name(int sig) +{ + switch (sig) { + case SIGALRM: + return "SIGALRM"; +#ifdef SIGCONT + case SIGCONT: + return "SIGCONT"; +#endif + case SIGINT: + return "SIGINT"; + case SIGQUIT: + return "SIGQUIT"; + case SIGTERM: + return "SIGTERM"; +#ifdef SIGTSTP + case SIGTSTP: + return "SIGTSTP"; +#endif +#ifdef SIGTTOU + case SIGTTOU: + return "SIGTTOU"; +#endif +#ifdef SIGWINCH + case SIGWINCH: + return "SIGWINCH"; +#endif + default: + return "unknown signal"; + } +} +#endif + /* * Note: This code is fragile! Its problem is that different OSs * handle restart of system calls interrupted by signals differently. @@ -200,14 +234,12 @@ tstp(int dummy GCC_UNUSED) static void cleanup(int sig) { - static int nested; - /* * Actually, doing any sort of I/O from within an signal handler is * "unsafe". But we'll _try_ to clean up the screen and terminal * settings on the way out. */ - if (!nested++ + if (!_nc_globals.cleanup_nested++ && (sig == SIGINT || sig == SIGQUIT)) { #if HAVE_SIGACTION || HAVE_SIGVEC @@ -215,7 +247,7 @@ cleanup(int sig) sigemptyset(&act.sa_mask); act.sa_flags = 0; act.sa_handler = SIG_IGN; - if (sigaction(sig, &act, (sigaction_t *) 0) == 0) + if (sigaction(sig, &act, NULL) == 0) #else if (signal(sig, SIG_IGN) != SIG_ERR) #endif @@ -243,11 +275,7 @@ cleanup(int sig) static void sigwinch(int sig GCC_UNUSED) { - SCREEN *scan = _nc_screen_chain; - while (scan) { - scan->_sig_winch = TRUE; - scan = scan->_next_screen; - } + _nc_globals.have_sigwinch = 1; } #endif /* USE_SIGWINCH */ @@ -255,43 +283,57 @@ sigwinch(int sig GCC_UNUSED) * If the given signal is still in its default state, set it to the given * handler. */ -#if HAVE_SIGACTION || HAVE_SIGVEC static int -CatchIfDefault(int sig, sigaction_t * act) +CatchIfDefault(int sig, RETSIGTYPE (*handler) (int)) { + int result; +#if HAVE_SIGACTION || HAVE_SIGVEC sigaction_t old_act; + sigaction_t new_act; + + memset(&new_act, 0, sizeof(new_act)); + sigemptyset(&new_act.sa_mask); +#ifdef SA_RESTART +#ifdef SIGWINCH + if (sig != SIGWINCH) +#endif + new_act.sa_flags |= SA_RESTART; +#endif /* SA_RESTART */ + new_act.sa_handler = handler; - if (sigaction(sig, (sigaction_t *) 0, &old_act) == 0 + if (sigaction(sig, NULL, &old_act) == 0 && (old_act.sa_handler == SIG_DFL + || old_act.sa_handler == handler #if USE_SIGWINCH || (sig == SIGWINCH && old_act.sa_handler == SIG_IGN) #endif )) { - (void) sigaction(sig, act, (sigaction_t *) 0); - return TRUE; + (void) sigaction(sig, &new_act, NULL); + result = TRUE; + } else { + result = FALSE; } - return FALSE; -} -#else -static int -CatchIfDefault(int sig, RETSIGTYPE(*handler) (int)) -{ - void (*ohandler) (int); +#else /* !HAVE_SIGACTION */ + RETSIGTYPE (*ohandler) (int); ohandler = signal(sig, SIG_IGN); if (ohandler == SIG_DFL + || ohandler == handler #if USE_SIGWINCH || (sig == SIGWINCH && ohandler == SIG_IGN) #endif ) { signal(sig, handler); - return TRUE; + result = TRUE; } else { signal(sig, ohandler); - return FALSE; + result = FALSE; } -} #endif + T(("CatchIfDefault - will %scatch %s", + result ? "" : "not ", signal_name(sig))); + return result; +} /* * This is invoked once at the beginning (e.g., from 'initscr()'), to @@ -304,63 +346,46 @@ CatchIfDefault(int sig, RETSIGTYPE(*handler) (int)) * The XSI document implies that we shouldn't keep the SIGTSTP handler if * the caller later changes its mind, but that doesn't seem correct. */ -void +NCURSES_EXPORT(void) _nc_signal_handler(bool enable) { + T((T_CALLED("_nc_signal_handler(%d)"), enable)); #if USE_SIGTSTP /* Xenix 2.x doesn't have SIGTSTP, for example */ - static sigaction_t act, oact; - static int ignore; - - if (!ignore) { - if (!enable) { - act.sa_handler = SIG_IGN; - sigaction(SIGTSTP, &act, &oact); - } else if (act.sa_handler) { - sigaction(SIGTSTP, &oact, NULL); - } else { /*initialize */ - sigemptyset(&act.sa_mask); - act.sa_flags = 0; -#if USE_SIGWINCH - act.sa_handler = sigwinch; - CatchIfDefault(SIGWINCH, &act); -#endif - + { + static bool ignore_tstp = FALSE; + + if (!ignore_tstp) { + static sigaction_t new_sigaction, old_sigaction; + + if (!enable) { + new_sigaction.sa_handler = SIG_IGN; + sigaction(SIGTSTP, &new_sigaction, &old_sigaction); + } else if (new_sigaction.sa_handler != SIG_DFL) { + sigaction(SIGTSTP, &old_sigaction, NULL); + } else if (sigaction(SIGTSTP, NULL, &old_sigaction) == 0 + && (old_sigaction.sa_handler == SIG_DFL)) { + sigemptyset(&new_sigaction.sa_mask); #ifdef SA_RESTART - act.sa_flags |= SA_RESTART; + new_sigaction.sa_flags |= SA_RESTART; #endif /* SA_RESTART */ - act.sa_handler = cleanup; - CatchIfDefault(SIGINT, &act); - CatchIfDefault(SIGTERM, &act); - - act.sa_handler = tstp; - if (!CatchIfDefault(SIGTSTP, &act)) - ignore = TRUE; + new_sigaction.sa_handler = tstp; + (void) sigaction(SIGTSTP, &new_sigaction, NULL); + } else { + ignore_tstp = TRUE; + } } } -#else /* !USE_SIGTSTP */ - if (enable) { -#if HAVE_SIGACTION || HAVE_SIGVEC - static sigaction_t act; - sigemptyset(&act.sa_mask); -#if USE_SIGWINCH - act.sa_handler = sigwinch; - CatchIfDefault(SIGWINCH, &act); -#endif -#ifdef SA_RESTART - act.sa_flags |= SA_RESTART; -#endif /* SA_RESTART */ - act.sa_handler = cleanup; - CatchIfDefault(SIGINT, &act); - CatchIfDefault(SIGTERM, &act); - -#else /* !(HAVE_SIGACTION || HAVE_SIGVEC) */ +#endif /* !USE_SIGTSTP */ - CatchIfDefault(SIGINT, cleanup); - CatchIfDefault(SIGTERM, cleanup); + if (!_nc_globals.init_signals) { + if (enable) { + CatchIfDefault(SIGINT, cleanup); + CatchIfDefault(SIGTERM, cleanup); #if USE_SIGWINCH - CatchIfDefault(SIGWINCH, sigwinch); + CatchIfDefault(SIGWINCH, sigwinch); #endif -#endif /* !(HAVE_SIGACTION || HAVE_SIGVEC) */ + _nc_globals.init_signals = TRUE; + } } -#endif /* !USE_SIGTSTP */ + returnVoid; }