/****************************************************************************
- * Copyright (c) 1998,1999 Free Software Foundation, Inc. *
+ * Copyright (c) 1998-2008,2009 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 *
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ * and: Thomas E. Dickey 1995-on *
****************************************************************************/
-
/*
** lib_tstp.c
**
** The routine _nc_signal_handler().
**
*/
-
#include <curses.priv.h>
-#include <signal.h>
#include <SigAction.h>
-#if defined(SVR4_ACTION) && !defined(_POSIX_SOURCE)
+#if SVR4_ACTION && !defined(_POSIX_SOURCE)
#define _POSIX_SOURCE
#endif
-MODULE_ID("$Id: lib_tstp.c,v 1.20 1999/10/22 23:11:09 tom Exp $")
+MODULE_ID("$Id: lib_tstp.c,v 1.39 2009/05/09 15:46:20 tom Exp $")
#if defined(SIGTSTP) && (HAVE_SIGACTION || HAVE_SIGVEC)
#define USE_SIGTSTP 1
#define USE_SIGTSTP 0
#endif
+#ifdef TRACE
+static const char *
+signal_name(int sig)
+{
+ switch (sig) {
+#ifdef SIGALRM
+ case SIGALRM:
+ return "SIGALRM";
+#endif
+#ifdef SIGCONT
+ case SIGCONT:
+ return "SIGCONT";
+#endif
+ case SIGINT:
+ return "SIGINT";
+#ifdef SIGQUIT
+ case SIGQUIT:
+ return "SIGQUIT";
+#endif
+ 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.
*/
#if USE_SIGTSTP
-static void tstp(int dummy GCC_UNUSED)
+static void
+tstp(int dummy GCC_UNUSED)
{
- sigset_t mask, omask;
- sigaction_t act, oact;
+ SCREEN *sp = CURRENT_SCREEN;
+ sigset_t mask, omask;
+ sigaction_t act, oact;
#ifdef SIGTTOU
- int sigttou_blocked;
+ int sigttou_blocked;
#endif
- T(("tstp() called"));
-
- /*
- * The user may have changed the prog_mode tty bits, so save them.
- *
- * But first try to detect whether we still are in the foreground
- * process group - if not, an interactive shell may already have
- * taken ownership of the tty and modified the settings when our
- * parent was stopped before us, and we would likely pick up the
- * settings already modified by the shell.
- */
- if (SP != 0 && !SP->_endwin) /* don't do this if we're not in curses */
+ T(("tstp() called"));
+
+ /*
+ * The user may have changed the prog_mode tty bits, so save them.
+ *
+ * But first try to detect whether we still are in the foreground
+ * process group - if not, an interactive shell may already have
+ * taken ownership of the tty and modified the settings when our
+ * parent was stopped before us, and we would likely pick up the
+ * settings already modified by the shell.
+ */
+ if (sp != 0 && !sp->_endwin) /* don't do this if we're not in curses */
#if HAVE_TCGETPGRP
if (tcgetpgrp(STDIN_FILENO) == getpgrp())
#endif
- def_prog_mode();
-
- /*
- * Block window change and timer signals. The latter
- * is because applications use timers to decide when
- * to repaint the screen.
- */
- (void)sigemptyset(&mask);
- (void)sigaddset(&mask, SIGALRM);
+ NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
+
+ /*
+ * Block window change and timer signals. The latter
+ * is because applications use timers to decide when
+ * to repaint the screen.
+ */
+ (void) sigemptyset(&mask);
+#ifdef SIGALRM
+ (void) sigaddset(&mask, SIGALRM);
+#endif
#if USE_SIGWINCH
- (void)sigaddset(&mask, SIGWINCH);
+ (void) sigaddset(&mask, SIGWINCH);
#endif
- (void)sigprocmask(SIG_BLOCK, &mask, &omask);
+ (void) sigprocmask(SIG_BLOCK, &mask, &omask);
#ifdef SIGTTOU
- sigttou_blocked = sigismember(&omask, SIGTTOU);
- if (!sigttou_blocked) {
- (void)sigemptyset(&mask);
- (void)sigaddset(&mask, SIGTTOU);
- (void)sigprocmask(SIG_BLOCK, &mask, NULL);
- }
+ sigttou_blocked = sigismember(&omask, SIGTTOU);
+ if (!sigttou_blocked) {
+ (void) sigemptyset(&mask);
+ (void) sigaddset(&mask, SIGTTOU);
+ (void) sigprocmask(SIG_BLOCK, &mask, NULL);
+ }
#endif
- /*
- * End window mode, which also resets the terminal state to the
- * original (pre-curses) modes.
- */
- endwin();
+ /*
+ * End window mode, which also resets the terminal state to the
+ * original (pre-curses) modes.
+ */
+ NCURSES_SP_NAME(endwin) (NCURSES_SP_ARG);
- /* Unblock SIGTSTP. */
- (void)sigemptyset(&mask);
- (void)sigaddset(&mask, SIGTSTP);
+ /* Unblock SIGTSTP. */
+ (void) sigemptyset(&mask);
+ (void) sigaddset(&mask, SIGTSTP);
#ifdef SIGTTOU
- if (!sigttou_blocked) {
- /* Unblock this too if it wasn't blocked on entry */
- (void)sigaddset(&mask, SIGTTOU);
- }
+ if (!sigttou_blocked) {
+ /* Unblock this too if it wasn't blocked on entry */
+ (void) sigaddset(&mask, SIGTTOU);
+ }
#endif
- (void)sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
- /* Now we want to resend SIGSTP to this process and suspend it */
- act.sa_handler = SIG_DFL;
- sigemptyset(&act.sa_mask);
- act.sa_flags = 0;
+ /* Now we want to resend SIGSTP to this process and suspend it */
+ act.sa_handler = SIG_DFL;
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = 0;
#ifdef SA_RESTART
- act.sa_flags |= SA_RESTART;
+ act.sa_flags |= SA_RESTART;
#endif /* SA_RESTART */
- sigaction(SIGTSTP, &act, &oact);
- kill(getpid(), SIGTSTP);
+ sigaction(SIGTSTP, &act, &oact);
+ kill(getpid(), SIGTSTP);
- /* Process gets suspended...time passes...process resumes */
+ /* Process gets suspended...time passes...process resumes */
- T(("SIGCONT received"));
- sigaction(SIGTSTP, &oact, NULL);
- flushinp();
+ T(("SIGCONT received"));
+ sigaction(SIGTSTP, &oact, NULL);
+ NCURSES_SP_NAME(flushinp) (NCURSES_SP_ARG);
- /*
- * If the user modified the tty state while suspended, he wants
- * those changes to stick. So save the new "default" terminal state.
- */
- def_shell_mode();
+ /*
+ * If the user modified the tty state while suspended, he wants
+ * those changes to stick. So save the new "default" terminal state.
+ */
+ NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
- /*
- * This relies on the fact that doupdate() will restore the
- * program-mode tty state, and issue enter_ca_mode if need be.
- */
- doupdate();
+ /*
+ * This relies on the fact that doupdate() will restore the
+ * program-mode tty state, and issue enter_ca_mode if need be.
+ */
+ NCURSES_SP_NAME(doupdate) (NCURSES_SP_ARG);
- /* Reset the signals. */
- (void)sigprocmask(SIG_SETMASK, &omask, NULL);
+ /* Reset the signals. */
+ (void) sigprocmask(SIG_SETMASK, &omask, NULL);
}
-#endif /* USE_SIGTSTP */
+#endif /* USE_SIGTSTP */
-static void cleanup(int sig)
+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++
- && (sig == SIGINT
- || sig == SIGQUIT)) {
+ SCREEN *sp = CURRENT_SCREEN;
+
+ /*
+ * 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 (!_nc_globals.cleanup_nested++
+ && (sig == SIGINT
+#ifdef SIGQUIT
+ || sig == SIGQUIT
+#endif
+ )) {
#if HAVE_SIGACTION || HAVE_SIGVEC
- sigaction_t act;
- sigemptyset(&act.sa_mask);
- act.sa_flags = 0;
- act.sa_handler = SIG_IGN;
- if (sigaction(sig, &act, (sigaction_t *)0) == 0)
+ sigaction_t act;
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = 0;
+ act.sa_handler = SIG_IGN;
+ if (sigaction(sig, &act, NULL) == 0)
#else
- if (signal(sig, SIG_IGN) != SIG_ERR)
+ if (signal(sig, SIG_IGN) != SIG_ERR)
#endif
- {
- SCREEN *scan = _nc_screen_chain;
- while(scan)
- {
- if (SP != 0
- && SP->_ofp != 0
- && isatty(fileno(SP->_ofp))) {
- SP->_cleanup = TRUE;
- }
- set_term(scan);
- endwin();
- if (SP)
- SP->_endwin = FALSE; /* in case we have an atexit! */
- scan = scan->_next_screen;
- }
+ {
+ SCREEN *scan;
+ for (each_screen(scan)) {
+ if (scan->_ofp != 0
+ && isatty(fileno(scan->_ofp))) {
+ scan->_cleanup = TRUE;
+ scan->_outch = NCURSES_SP_NAME(_nc_outch);
}
+ set_term(scan);
+ NCURSES_SP_NAME(endwin) (NCURSES_SP_ARG);
+ if (sp)
+ sp->_endwin = FALSE; /* in case we have an atexit! */
+ }
}
- exit(EXIT_FAILURE);
+ }
+ exit(EXIT_FAILURE);
}
#if USE_SIGWINCH
-static void sigwinch(int sig GCC_UNUSED)
+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 */
* 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)
+static int
+CatchIfDefault(int sig, RETSIGTYPE (*handler) (int))
{
- sigaction_t old_act;
+ 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
- && (old_act.sa_handler == SIG_DFL
+ 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;
- }
- return FALSE;
-}
-#else
-static int CatchIfDefault(int sig, RETSIGTYPE (*handler)(int))
-{
- void (*ohandler)(int);
+ )) {
+ (void) sigaction(sig, &new_act, NULL);
+ result = TRUE;
+ } else {
+ result = FALSE;
+ }
+#else /* !HAVE_SIGACTION */
+ RETSIGTYPE (*ohandler) (int);
- ohandler = signal(sig, SIG_IGN);
- if (ohandler == SIG_DFL
+ ohandler = signal(sig, SIG_IGN);
+ if (ohandler == SIG_DFL
+ || ohandler == handler
#if USE_SIGWINCH
- || (sig == SIGWINCH && ohandler == SIG_IGN)
+ || (sig == SIGWINCH && ohandler == SIG_IGN)
#endif
) {
- signal(sig, handler);
- return TRUE;
- } else {
- signal(sig, ohandler);
- return FALSE;
- }
-}
+ signal(sig, handler);
+ result = TRUE;
+ } else {
+ signal(sig, ohandler);
+ 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
* 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 _nc_signal_handler(bool enable)
+NCURSES_EXPORT(void)
+_nc_signal_handler(bool 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
-
+ T((T_CALLED("_nc_signal_handler(%d)"), enable));
+#if USE_SIGTSTP /* Xenix 2.x doesn't have SIGTSTP, for example */
+ {
+ 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;
}
projects / ncurses.git / blobdiff