initial import from bash_3.1dfsg.orig.tar.gz

1 files changed, 265 insertions, 0 deletions

diff --git a/builtins/trap.def b/builtins/trap.def
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+This file is trap.def, from which is created trap.c.
+It implements the builtin "trap" in Bash.
+
+Copyright (C) 1987-2005 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 2, 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; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+
+$PRODUCES trap.c
+
+$BUILTIN trap
+$FUNCTION trap_builtin
+$SHORT_DOC trap [-lp] [arg signal_spec ...]
+The command ARG is to be read and executed when the shell receives
+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)
+the command ARG is executed on exit from the shell.  If a SIGNAL_SPEC
+is DEBUG, ARG is executed after every simple command.  If the`-p' option
+is supplied then the trap commands associated with each SIGNAL_SPEC are
+displayed.  If no arguments are supplied or if only `-p' is given, trap
+prints the list of commands associated with each signal.  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.  `trap -l' prints
+a list of signal names and their corresponding numbers.  Note that a
+signal can be sent to the shell with "kill -signal $$".
+$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 __P((int));
+static int display_traps __P((WORD_LIST *));
+
+/* 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 recieved.
+   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. */
+
+extern int posixly_correct;
+
+int
+trap_builtin (list)
+     WORD_LIST *list;
+{
+  int list_signal_names, display, result, opt, first_signal;
+
+  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;
+	default:
+	  builtin_usage ();
+	  return (EX_USAGE);
+	}
+    }
+  list = loptend;
+
+  opt = DSIG_NOCASE|DSIG_SIGPREFIX;	/* flags for decode_signal */
+
+  if (list_signal_names)
+    return (display_signal_list ((WORD_LIST *)NULL, 1));
+  else if (display || list == 0)
+    return (display_traps (list));
+  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 */
+      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;
+	}
+
+      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:
+			if (interactive)
+			  set_signal_handler (SIGINT, sigint_sighandler);
+			else
+			  set_signal_handler (SIGINT, termination_unwind_protect);
+			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)
+     int i;
+{
+  char *t, *p, *sn;
+
+  p = trap_list[i];
+  if (p == (char *)DEFAULT_SIG)
+    return;
+
+  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);
+
+  FREE (t);
+}
+
+static int
+display_traps (list)
+     WORD_LIST *list;
+{
+  int result, i;
+
+  if (list == 0)
+    {
+      for (i = 0; i < BASH_NSIG; i++)
+	showtrap (i);
+      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);
+    }
+
+  return (result);
+}