-/* eval.c -- reading and evaluating commands.
+/* eval.c -- reading and evaluating commands. */
- Copyright (C) 1996 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2011 Free Software Foundation, Inc.
- This file is part of GNU Bash.
+ This file is part of GNU Bash, the Bourne Again SHell.
- Bash is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY. No author or distributor accepts responsibility to
- anyone for the consequences of using it or for whether it serves
- any particular purpose or works at all, unless he says so in
- writing. Refer to the GNU Emacs General Public License for full
- details.
+ 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.
- Everyone is granted permission to copy, modify and redistribute
- Bash, but only under the conditions described in the GNU General
- Public License. A copy of this license is supposed to have been
- given to you along with GNU Emacs so you can know your rights and
- responsibilities. It should be in a file named COPYING.
+ 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.
- Among other things, the copyright notice and this notice must be
- preserved on all copies. */
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
#include "config.h"
#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
# include <unistd.h>
#endif
#include "bashansi.h"
#include <stdio.h>
+#include <signal.h>
+
+#include "bashintl.h"
+
#include "shell.h"
#include "flags.h"
#include "trap.h"
#include "input.h"
#include "execute_cmd.h"
-extern int yyparse ();
+#if defined (HISTORY)
+# include "bashhist.h"
+#endif
extern int EOF_reached;
-extern int indirection_level, interactive, interactive_shell;
+extern int indirection_level;
+extern int posixly_correct;
extern int subshell_environment, running_under_emacs;
-extern int last_command_exit_value;
+extern int last_command_exit_value, stdin_redir;
extern int need_here_doc;
extern int current_command_number, current_command_line_count, line_number;
-extern char *ps1_prompt, **prompt_string_pointer;
extern int expand_aliases;
+extern char *ps0_prompt;
+
+#if defined (HAVE_POSIX_SIGNALS)
+extern sigset_t top_level_mask;
+#endif
+
+static void send_pwd_to_eterm __P((void));
+static sighandler alrm_catcher __P((int));
/* Read and execute commands until EOF is reached. This assumes that
the input source has already been initialized. */
reader_loop ()
{
int our_indirection_level;
- COMMAND *current_command = (COMMAND *)NULL;
+ COMMAND * volatile current_command;
+
+ USE_VAR(current_command);
+
+ current_command = (COMMAND *)NULL;
our_indirection_level = ++indirection_level;
{
int code;
- code = setjmp (top_level);
+ code = setjmp_nosigs (top_level);
#if defined (PROCESS_SUBSTITUTION)
unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */
+ /* XXX - why do we set this every time through the loop? And why do
+ it if SIGINT is trapped in an interactive shell? */
if (interactive_shell && signal_is_ignored (SIGINT) == 0)
set_signal_handler (SIGINT, sigint_sighandler);
switch (code)
{
- /* Some kind of throw to top_level has occured. */
+ /* Some kind of throw to top_level has occurred. */
case FORCE_EOF:
+ case ERREXIT:
case EXITPROG:
current_command = (COMMAND *)NULL;
+ if (exit_immediately_on_error)
+ variable_context = 0; /* not in a function */
EOF_Reached = EOF;
goto exec_done;
case DISCARD:
- last_command_exit_value = 1;
+ /* Make sure the exit status is reset to a non-zero value, but
+ leave existing non-zero values (e.g., > 128 on signal)
+ alone. */
+ if (last_command_exit_value == 0)
+ last_command_exit_value = EXECUTION_FAILURE;
if (subshell_environment)
{
current_command = (COMMAND *)NULL;
dispose_command (current_command);
current_command = (COMMAND *)NULL;
}
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
+#endif
break;
default:
- programming_error ("reader_loop: bad jump: code %d", code);
+ command_error ("reader_loop", CMDERR_BADJUMP, code, 0);
}
}
executing = 0;
- dispose_used_env_vars ();
+ if (temporary_env)
+ dispose_used_env_vars ();
#if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA)
/* Attempt to reclaim memory allocated with alloca (). */
current_command_number++;
executing = 1;
+ stdin_redir = 0;
+
+ /* If the shell is interactive, expand and display $PS0 after reading a
+ command (possibly a list or pipeline) and before executing it. */
+ if (interactive && ps0_prompt)
+ {
+ char *ps0_string;
+
+ ps0_string = decode_prompt_string (ps0_prompt);
+ if (ps0_string && *ps0_string)
+ {
+ fprintf (stderr, "%s", ps0_string);
+ fflush (stderr);
+ }
+ free (ps0_string);
+ }
+
execute_command (current_command);
exec_done:
+ QUIT;
+
if (current_command)
- {
+ {
dispose_command (current_command);
current_command = (COMMAND *)NULL;
- }
-
- QUIT;
+ }
}
}
else
alrm_catcher(i)
int i;
{
- printf ("%ctimed out waiting for input: auto-logout\n", '\07');
+ printf (_("\007timed out waiting for input: auto-logout\n"));
+ fflush (stdout);
+ bash_logout (); /* run ~/.bash_logout if this is a login shell */
jump_to_top_level (EXITPROG);
SIGRETURN (0);
}
static void
send_pwd_to_eterm ()
{
- char *pwd;
+ char *pwd, *f;
+ f = 0;
pwd = get_string_value ("PWD");
if (pwd == 0)
- pwd = get_working_directory ("eterm");
+ f = pwd = get_working_directory ("eterm");
fprintf (stderr, "\032/%s\n", pwd);
+ free (f);
}
/* Call the YACC-generated parser and return the status of the parse.
/* Allow the execution of a random command just before the printing
of each primary prompt. If the shell variable PROMPT_COMMAND
is set then the value of it is the command to execute. */
- if (interactive && bash_input.type != st_string)
+ /* The tests are a combination of SHOULD_PROMPT() and prompt_again()
+ from parse.y, which are the conditions under which the prompt is
+ actually printed. */
+ if (interactive && bash_input.type != st_string && parser_expanding_alias() == 0)
{
command_to_execute = get_string_value ("PROMPT_COMMAND");
if (command_to_execute)
- execute_prompt_command (command_to_execute);
+ execute_variable_command (command_to_execute, "PROMPT_COMMAND");
if (running_under_emacs == 2)
send_pwd_to_eterm (); /* Yuck */
int tmout_len, result;
SigHandler *old_alrm;
- prompt_string_pointer = &ps1_prompt;
+ set_current_prompt_level (1);
global_command = (COMMAND *)NULL;
/* Only do timeouts if interactive. */
tmout_var = (SHELL_VAR *)NULL;
tmout_len = 0;
+ old_alrm = (SigHandler *)NULL;
if (interactive)
{
tmout_var = find_variable ("TMOUT");
- old_alrm = (SigHandler *)NULL;
- if (tmout_var && tmout_var->value)
+ if (tmout_var && var_isset (tmout_var))
{
- tmout_len = atoi (tmout_var->value);
+ tmout_len = atoi (value_cell (tmout_var));
if (tmout_len > 0)
{
old_alrm = set_signal_handler (SIGALRM, alrm_catcher);
projects / thirdparty / bash.git / blobdiff