From 6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 17:38:56 +0200
Subject: Adding upstream version 5.2.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 builtins/trap.def | 316 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 316 insertions(+)
 create mode 100644 builtins/trap.def

(limited to 'builtins/trap.def')

diff --git a/builtins/trap.def b/builtins/trap.def
new file mode 100644
index 0000000..9422943
--- /dev/null
+++ b/builtins/trap.def
@@ -0,0 +1,316 @@
+This file is trap.def, from which is created trap.c.
+It implements the builtin "trap" in Bash.
+
+Copyright (C) 1987-2021 Free Software Foundation, Inc.
+
+This file is part of GNU Bash, the Bourne Again SHell.
+
+Bash is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Bash is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+
+$PRODUCES trap.c
+
+$BUILTIN trap
+$FUNCTION trap_builtin
+$SHORT_DOC trap [-lp] [[arg] signal_spec ...]
+Trap signals and other events.
+
+Defines and activates handlers to be run when the shell receives signals
+or other conditions.
+
+ARG is a command to be read and executed when the shell receives the
+signal(s) SIGNAL_SPEC.  If ARG is absent (and a single SIGNAL_SPEC
+is supplied) or `-', each specified signal is reset to its original
+value.  If ARG is the null string each SIGNAL_SPEC is ignored by the
+shell and by the commands it invokes.
+
+If a SIGNAL_SPEC is EXIT (0) ARG is executed on exit from the shell.  If
+a SIGNAL_SPEC is DEBUG, ARG is executed before every simple command.  If
+a SIGNAL_SPEC is RETURN, ARG is executed each time a shell function or a
+script run by the . or source builtins finishes executing.  A SIGNAL_SPEC
+of ERR means to execute ARG each time a command's failure would cause the
+shell to exit when the -e option is enabled.
+
+If no arguments are supplied, trap prints the list of commands associated
+with each signal.
+
+Options:
+  -l	print a list of signal names and their corresponding numbers
+  -p	display the trap commands associated with each SIGNAL_SPEC
+
+Each SIGNAL_SPEC is either a signal name in <signal.h> or a signal number.
+Signal names are case insensitive and the SIG prefix is optional.  A
+signal may be sent to the shell with "kill -signal $$".
+
+Exit Status:
+Returns success unless a SIGSPEC is invalid or an invalid option is given.
+$END
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+#  ifdef _MINIX
+#    include <sys/types.h>
+#  endif
+#  include <unistd.h>
+#endif
+
+#include "../bashtypes.h"
+#include <signal.h>
+#include <stdio.h>
+#include "../bashansi.h"
+
+#include "../shell.h"
+#include "../trap.h"
+#include "common.h"
+#include "bashgetopt.h"
+
+static void showtrap PARAMS((int, int));
+static int display_traps PARAMS((WORD_LIST *, int));
+
+/* The trap command:
+
+   trap <arg> <signal ...>
+   trap <signal ...>
+   trap -l
+   trap -p [sigspec ...]
+   trap [--]
+
+   Set things up so that ARG is executed when SIGNAL(s) N is received.
+   If ARG is the empty string, then ignore the SIGNAL(s).  If there is
+   no ARG, then set the trap for SIGNAL(s) to its original value.  Just
+   plain "trap" means to print out the list of commands associated with
+   each signal number.  Single arg of "-l" means list the signal names. */
+
+/* Possible operations to perform on the list of signals.*/
+#define SET 0			/* Set this signal to first_arg. */
+#define REVERT 1		/* Revert to this signals original value. */
+#define IGNORE 2		/* Ignore this signal. */
+
+int
+trap_builtin (list)
+     WORD_LIST *list;
+{
+  int list_signal_names, display, result, opt;
+
+  list_signal_names = display = 0;
+  result = EXECUTION_SUCCESS;
+
+  reset_internal_getopt ();
+  while ((opt = internal_getopt (list, "lp")) != -1)
+    {
+      switch (opt)
+	{
+	case 'l':
+	  list_signal_names++;
+	  break;
+	case 'p':
+	  display++;
+	  break;
+	CASE_HELPOPT;
+	default:
+	  builtin_usage ();
+	  return (EX_USAGE);
+	}
+    }
+  list = loptend;
+
+  opt = DSIG_NOCASE|DSIG_SIGPREFIX;	/* flags for decode_signal */
+
+  if (list_signal_names)
+    return (sh_chkwrite (display_signal_list ((WORD_LIST *)NULL, 1)));
+  else if (display || list == 0)
+    {
+      initialize_terminating_signals ();
+      get_all_original_signals ();
+      return (sh_chkwrite (display_traps (list, display && posixly_correct)));
+    }
+  else
+    {
+      char *first_arg;
+      int operation, sig, first_signal;
+
+      operation = SET;
+      first_arg = list->word->word;
+      first_signal = first_arg && *first_arg && all_digits (first_arg) && signal_object_p (first_arg, opt);
+
+      /* Backwards compatibility.  XXX - question about whether or not we
+	 should throw an error if an all-digit argument doesn't correspond
+	 to a valid signal number (e.g., if it's `50' on a system with only
+	 32 signals).  */
+      if (first_signal)
+	operation = REVERT;
+      /* When in posix mode, the historical behavior of looking for a
+	 missing first argument is disabled.  To revert to the original
+	 signal handling disposition, use `-' as the first argument. */
+      else if (posixly_correct == 0 && first_arg && *first_arg &&
+		(*first_arg != '-' || first_arg[1]) &&
+		signal_object_p (first_arg, opt) && list->next == 0)
+	operation = REVERT;
+      else
+	{
+	  list = list->next;
+	  if (list == 0)
+	    {
+	      builtin_usage ();
+	      return (EX_USAGE);
+	    }
+	  else if (*first_arg == '\0')
+	    operation = IGNORE;
+	  else if (first_arg[0] == '-' && !first_arg[1])
+	    operation = REVERT;
+	}
+
+      /* If we're in a command substitution, we haven't freed the trap strings
+	 (though we reset the signal handlers).  If we're setting a trap to
+	 handle a signal here, free the rest of the trap strings since they
+	 don't apply any more. */
+      if (subshell_environment & SUBSHELL_RESETTRAP)
+	{
+	  free_trap_strings ();
+	  subshell_environment &= ~SUBSHELL_RESETTRAP;
+	}
+
+      while (list)
+	{
+	  sig = decode_signal (list->word->word, opt);
+
+	  if (sig == NO_SIG)
+	    {
+	      sh_invalidsig (list->word->word);
+	      result = EXECUTION_FAILURE;
+	    }
+	  else
+	    {
+	      switch (operation)
+		{
+		  case SET:
+		    set_signal (sig, first_arg);
+		    break;
+
+		  case REVERT:
+		    restore_default_signal (sig);
+
+		    /* Signals that the shell treats specially need special
+		       handling. */
+		    switch (sig)
+		      {
+		      case SIGINT:
+			/* XXX - should we do this if original disposition
+			   was SIG_IGN? */
+			if (interactive)
+			  set_signal_handler (SIGINT, sigint_sighandler);
+			/* special cases for interactive == 0 */
+			else if (interactive_shell && (sourcelevel||running_trap||parse_and_execute_level))
+			  set_signal_handler (SIGINT, sigint_sighandler);
+			else
+			  set_signal_handler (SIGINT, termsig_sighandler);
+			break;
+
+		      case SIGQUIT:
+			/* Always ignore SIGQUIT. */
+			set_signal_handler (SIGQUIT, SIG_IGN);
+			break;
+		      case SIGTERM:
+#if defined (JOB_CONTROL)
+		      case SIGTTIN:
+		      case SIGTTOU:
+		      case SIGTSTP:
+#endif /* JOB_CONTROL */
+			if (interactive)
+			  set_signal_handler (sig, SIG_IGN);
+			break;
+		      }
+		    break;
+
+		  case IGNORE:
+		    ignore_signal (sig);
+		    break;
+		}
+	    }
+	  list = list->next;
+	}
+    }
+
+  return (result);
+}
+
+static void
+showtrap (i, show_default)
+     int i, show_default;
+{
+  char *t, *p, *sn;
+  int free_t;
+
+  free_t = 1;
+  p = trap_list[i];
+  if (p == (char *)DEFAULT_SIG && signal_is_hard_ignored (i) == 0)
+    {
+      if (show_default)
+	t = "-";
+      else
+	return;
+      free_t = 0;
+    }
+  else if (signal_is_hard_ignored (i))
+    t = (char *)NULL;
+  else
+    t = (p == (char *)IGNORE_SIG) ? (char *)NULL : sh_single_quote (p);
+
+  sn = signal_name (i);
+  /* Make sure that signals whose names are unknown (for whatever reason)
+     are printed as signal numbers. */
+  if (STREQN (sn, "SIGJUNK", 7) || STREQN (sn, "unknown", 7))
+    printf ("trap -- %s %d\n", t ? t : "''", i);
+  else if (posixly_correct)
+    {
+      if (STREQN (sn, "SIG", 3))
+	printf ("trap -- %s %s\n", t ? t : "''", sn+3);
+      else
+	printf ("trap -- %s %s\n", t ? t : "''", sn);
+    }
+  else
+    printf ("trap -- %s %s\n", t ? t : "''", sn);
+
+  if (free_t)
+    FREE (t);
+}
+
+static int
+display_traps (list, show_all)
+     WORD_LIST *list;
+     int show_all;
+{
+  int result, i;
+
+  if (list == 0)
+    {
+      for (i = 0; i < BASH_NSIG; i++)
+	showtrap (i, show_all);
+      return (EXECUTION_SUCCESS);
+    }
+
+  for (result = EXECUTION_SUCCESS; list; list = list->next)
+    {
+      i = decode_signal (list->word->word, DSIG_NOCASE|DSIG_SIGPREFIX);
+      if (i == NO_SIG)
+	{
+	  sh_invalidsig (list->word->word);
+	  result = EXECUTION_FAILURE;
+	}
+      else
+	showtrap (i, show_all);
+    }
+
+  return (result);
+}
-- 
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