This file is trap.def, from which is created trap.c.
It implements the builtin "trap" in Bash.
-Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
+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 1, or (at your option) any later
+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
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, 675 Mass Ave, Cambridge, MA 02139, USA.
+Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
$PRODUCES trap.c
$BUILTIN trap
$FUNCTION trap_builtin
-$SHORT_DOC trap [arg] [signal_spec]
+$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 all specified signals are
-reset to their original values. If ARG is the null string this
-signal is ignored by the shell and by the commands it invokes. If
-SIGNAL_SPEC is EXIT (0) the command ARG is executed on exit from
-the shell. The trap command with no arguments prints the list of
-commands associated with each signal number. SIGNAL_SPEC is either
-a signal name in <signal.h>, or a signal number. The syntax `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 $$".
+signal(s) SIGNAL_SPEC. If ARG is absent (and a single SIGNAL_SPEC
+is supplied) or `-', each specified signal is reset to its original
+value. If ARG is the null string each SIGNAL_SPEC is ignored by the
+shell and by the commands it invokes. If a SIGNAL_SPEC is EXIT (0)
+the command ARG is executed on exit from the shell. If a SIGNAL_SPEC
+is DEBUG, ARG is executed after every simple command. If the`-p' option
+is supplied then the trap commands associated with each SIGNAL_SPEC are
+displayed. If no arguments are supplied or if only `-p' is given, trap
+prints the list of commands associated with each signal. Each SIGNAL_SPEC
+is either a signal name in <signal.h> or a signal number. Signal names
+are case insensitive and the SIG prefix is optional. `trap -l' prints
+a list of signal names and their corresponding numbers. Note that a
+signal can be sent to the shell with "kill -signal $$".
$END
-#include <sys/types.h>
+#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.
#define REVERT 1 /* Revert to this signals original value. */
#define IGNORE 2 /* Ignore this signal. */
-extern int interactive;
+extern int posixly_correct;
+int
trap_builtin (list)
WORD_LIST *list;
{
- register int i;
- int list_signal_names = 0;
+ int list_signal_names, display, result, opt, first_signal;
- while (list)
+ list_signal_names = display = 0;
+ result = EXECUTION_SUCCESS;
+ reset_internal_getopt ();
+ while ((opt = internal_getopt (list, "lp")) != -1)
{
- if (ISOPTION (list->word->word, 'l'))
+ switch (opt)
{
+ case 'l':
list_signal_names++;
- list = list->next;
- }
- else if (ISOPTION (list->word->word, '-'))
- {
- list = list->next;
break;
- }
- else if ((*list->word->word == '-') && list->word->word[1])
- {
- bad_option (list->word->word);
- builtin_error ("usage: trap [-l] [arg] [sigspec]");
+ case 'p':
+ display++;
+ break;
+ default:
+ builtin_usage ();
return (EX_USAGE);
}
- else
- break;
}
+ 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
{
- int column = 0;
+ char *first_arg;
+ int operation, sig, first_signal;
- for (i = 0; i < NSIG; i++)
- {
- printf ("%2d) %s", i, signal_name (i));
- if (++column < 4)
- printf ("\t");
- else
- {
- printf ("\n");
- column = 0;
- }
- }
- if (column != 0)
- printf ("\n");
- return (EXECUTION_SUCCESS);
- }
+ operation = SET;
+ first_arg = list->word->word;
+ first_signal = first_arg && *first_arg && all_digits (first_arg) && signal_object_p (first_arg, opt);
- if (list)
- {
- char *first_arg = list->word->word;
- int operation = SET, any_failed = 0;
-
- if (signal_object_p (first_arg))
+ /* 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 (*first_arg == '\0')
+ 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)
{
- int sig;
-
- sig = decode_signal (list->word->word);
+ sig = decode_signal (list->word->word, opt);
if (sig == NO_SIG)
{
- builtin_error ("%s: not a signal specification",
- list->word->word);
- any_failed++;
+ sh_invalidsig (list->word->word);
+ result = EXECUTION_FAILURE;
}
else
{
}
list = list->next;
}
- return ((!any_failed) ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
}
- for (i = 0; i < NSIG; i++)
+ 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)
{
- char *t, *p;
+ 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);
+}
- p = trap_list[i];
+static int
+display_traps (list)
+ WORD_LIST *list;
+{
+ int result, i;
- if (p == (char *)DEFAULT_SIG)
- continue;
+ if (list == 0)
+ {
+ for (i = 0; i < BASH_NSIG; i++)
+ showtrap (i);
+ return (EXECUTION_SUCCESS);
+ }
- t = (p == (char *)IGNORE_SIG) ? (char *)NULL : single_quote (p);
- printf ("trap -- %s %s\n", t ? t : "''", signal_name (i));
- if (t)
- free (t);
+ 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 (EXECUTION_SUCCESS);
+
+ return (result);
}
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