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Imported from ../bash-2.0.tar.gz.

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This commit is contained in:
Jari Aalto 1996-12-23 17:02:34 +00:00
commit ccc6cda312
502 changed files with 91988 additions and 69123 deletions
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164
builtins/trap.def
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@ -23,30 +23,46 @@ $PRODUCES trap.c
$BUILTIN trap
$FUNCTION trap_builtin
$SHORT_DOC trap [arg] [signal_spec]
$SHORT_DOC trap [arg] [signal_spec] or trap -l
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 $$".
reset to their original values. If ARG is the null string each
SIGNAL_SPEC is ignored by the shell and by the commands it invokes.
If SIGNAL_SPEC is EXIT (0) the command ARG is executed on exit from
the shell. If SIGNAL_SPEC is DEBUG, ARG is executed after every
command. If ARG is `-p' then the trap commands associated with
each SIGNAL_SPEC are displayed. If no arguments are supplied or if
only `-p' is given, trap prints the list of commands associated with
each signal number. SIGNAL_SPEC is either a signal name in <signal.h>
or a signal number. `trap -l' prints a list of signal names and their
corresponding numbers. Note that a signal can be sent to the shell
with "kill -signal $$".
$END
#include <sys/types.h>
#include <config.h>
#if defined (HAVE_UNISTD_H)
# 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 int display_traps ();
/* 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.
@ -62,60 +78,44 @@ $END
extern int interactive;
int
trap_builtin (list)
WORD_LIST *list;
{
register int i;
int list_signal_names = 0;
int list_signal_names, display, result, opt;
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;
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;
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);
}
if (list)
{
char *first_arg = list->word->word;
int operation = SET, any_failed = 0;
if (signal_object_p (first_arg))
operation = SET;
first_arg = list->word->word;
if (first_arg && *first_arg && signal_object_p (first_arg))
operation = REVERT;
else
{
@ -128,15 +128,13 @@ trap_builtin (list)
while (list)
{
int sig;
sig = decode_signal (list->word->word);
if (sig == NO_SIG)
{
builtin_error ("%s: not a signal specification",
list->word->word);
any_failed++;
result = EXECUTION_FAILURE;
}
else
{
@ -183,22 +181,52 @@ trap_builtin (list)
}
list = list->next;
}
return ((!any_failed) ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
}
for (i = 0; i < NSIG; i++)
{
char *t, *p;
p = trap_list[i];
if (p == (char *)DEFAULT_SIG)
continue;
t = (p == (char *)IGNORE_SIG) ? (char *)NULL : single_quote (p);
printf ("trap -- %s %s\n", t ? t : "''", signal_name (i));
if (t)
free (t);
}
return (EXECUTION_SUCCESS);
return (result);
}
static void
showtrap (i)
int i;
{
char *t, *p;
p = trap_list[i];
if (p == (char *)DEFAULT_SIG)
return;
t = (p == (char *)IGNORE_SIG) ? (char *)NULL : single_quote (p);
printf ("trap -- %s %s\n", t ? t : "''", signal_name (i));
if (t)
free (t);
}
static int
display_traps (list)
WORD_LIST *list;
{
int result, i;
if (list == 0)
{
for (i = 0; i <= NSIG; i++)
showtrap (i);
return (EXECUTION_SUCCESS);
}
for (result = EXECUTION_SUCCESS; list; list = list->next)
{
i = decode_signal (list->word->word);
if (i == NO_SIG)
{
result = EXECUTION_FAILURE;
builtin_error ("%s: not a signal specification", list->word->word);
}
else
showtrap (i);
}
return (result);
}