Bash-4.2 distribution sources and documentation

[thirdparty/bash.git] / sig.c

diff --git a/sig.c b/sig.c
index be9676fdd0175f3982af732cfdfc7add758f0a3c..6bd1319b996751eee932dd19db4ba9de51bb4c86 100644 (file)
--- a/sig.c
+++ b/sig.c
@@ -1,6 +1,6 @@
 /* sig.c - interface for shell signal handlers and signal initialization. */
 
-/* Copyright (C) 1994-2009 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2010 Free Software Foundation, Inc.
 
    This file is part of GNU Bash, the Bourne Again SHell.
 
@@ -55,10 +55,15 @@
 extern int last_command_exit_value;
 extern int last_command_exit_signal;
 extern int return_catch_flag;
-extern int loop_level, continuing, breaking;
+extern int loop_level, continuing, breaking, funcnest;
 extern int executing_list;
 extern int comsub_ignore_return;
 extern int parse_and_execute_level, shell_initialized;
+#if defined (HISTORY)
+extern int history_lines_this_session;
+#endif
+
+extern void initialize_siglist ();
 
 /* Non-zero after SIGINT. */
 volatile int interrupt_state = 0;
@@ -214,7 +219,8 @@ static int termsigs_initialized = 0;
 
 /* Initialize signals that will terminate the shell to do some
    unwind protection.  For non-interactive shells, we only call
-   this when a trap is defined for EXIT (0). */
+   this when a trap is defined for EXIT (0) or when trap is run
+   to display signal dispositions. */
 void
 initialize_terminating_signals ()
 {
@@ -248,7 +254,8 @@ initialize_terminating_signals ()
       XSAFLAGS(i) = oact.sa_flags;
       /* Don't do anything with signals that are ignored at shell entry
         if the shell is not interactive. */
-      if (!interactive_shell && XHANDLER (i) == SIG_IGN)
+      /* XXX - should we do this for interactive shells, too? */
+      if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN)
        {
          sigaction (XSIG (i), &oact, &act);
          set_signal_ignored (XSIG (i));
@@ -271,7 +278,8 @@ initialize_terminating_signals ()
       XSAFLAGS(i) = 0;
       /* Don't do anything with signals that are ignored at shell entry
         if the shell is not interactive. */
-      if (!interactive_shell && XHANDLER (i) == SIG_IGN)
+      /* XXX - should we do this for interactive shells, too? */
+      if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN)
        {
          signal (XSIG (i), SIG_IGN);
          set_signal_ignored (XSIG (i));
@@ -367,7 +375,7 @@ top_level_cleanup ()
 #endif /* PROCESS_SUBSTITUTION */
 
   run_unwind_protects ();
-  loop_level = continuing = breaking = 0;
+  loop_level = continuing = breaking = funcnest = 0;
   executing_list = comsub_ignore_return = return_catch_flag = 0;
 }
 
@@ -418,7 +426,7 @@ throw_to_top_level ()
 #endif /* PROCESS_SUBSTITUTION */
 
   run_unwind_protects ();
-  loop_level = continuing = breaking = 0;
+  loop_level = continuing = breaking = funcnest = 0;
   executing_list = comsub_ignore_return = return_catch_flag = 0;
 
   if (interactive && print_newline)
@@ -495,6 +503,10 @@ termsig_sighandler (sig)
   /* XXX - should this also trigger when interrupt_immediately is set? */
   if (terminate_immediately)
     {
+#if defined (HISTORY)
+      /* XXX - will inhibit history file being written */
+      history_lines_this_session = 0;
+#endif
       terminate_immediately = 0;
       termsig_handler (sig);
     }
@@ -536,7 +548,7 @@ termsig_handler (sig)
 #endif /* PROCESS_SUBSTITUTION */
 
   /* Reset execution context */
-  loop_level = continuing = breaking = 0;
+  loop_level = continuing = breaking = funcnest = 0;
   executing_list = comsub_ignore_return = return_catch_flag = 0;
 
   run_exit_trap ();
@@ -650,15 +662,13 @@ set_signal_handler (sig, handler)
 
   act.sa_handler = handler;
   act.sa_flags = 0;
-#if 0
-  if (sig == SIGALRM)
-    act.sa_flags |= SA_INTERRUPT;      /* XXX */
-  else
-    act.sa_flags |= SA_RESTART;                /* XXX */
-#else
+
+  /* XXX - bash-4.2 */
+  /* We don't want a child death to interrupt interruptible system calls, even
+     if we take the time to reap children */
   if (sig == SIGCHLD)
-    act.sa_flags |= SA_RESTART;
-#endif
+    act.sa_flags |= SA_RESTART;                /* XXX */
+
   sigemptyset (&act.sa_mask);
   sigemptyset (&oact.sa_mask);
   sigaction (sig, &act, &oact);