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Bash-4.4 distribution sources and documentation

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This commit is contained in:
Chet Ramey 2016-09-15 16:59:08 -04:00
commit a0c0a00fc4
588 changed files with 130746 additions and 80164 deletions
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179
shell.c
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@ -1,6 +1,6 @@
/* shell.c -- GNU's idea of the POSIX shell specification. */
/* Copyright (C) 1987-2012 Free Software Foundation, Inc.
/* Copyright (C) 1987-2015 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
@ -38,7 +38,9 @@
#include <signal.h>
#include <errno.h>
#include "filecntl.h"
#include <pwd.h>
#if defined (HAVE_PWD_H)
# include <pwd.h>
#endif
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
@ -57,6 +59,9 @@
#if defined (JOB_CONTROL)
#include "jobs.h"
#else
extern int initialize_job_control __P((int));
extern int get_tty_state __P((void));
#endif /* JOB_CONTROL */
#include "input.h"
@ -100,6 +105,7 @@ extern char *dist_version, *release_status;
extern int patch_level, build_version;
extern int shell_level;
extern int subshell_environment;
extern int running_in_background;
extern int last_command_exit_value;
extern int line_number;
extern int expand_aliases;
@ -159,6 +165,7 @@ int autocd = 0;
This is a superset of the information provided by interactive_shell.
*/
int startup_state = 0;
int reading_shell_script = 0;
/* Special debugging helper. */
int debugging_login_shell = 0;
@ -192,7 +199,7 @@ int have_devfd = 0;
#endif
/* The name of the .(shell)rc file. */
static char *bashrc_file = "~/.bashrc";
static char *bashrc_file = DEFAULT_BASHRC;
/* Non-zero means to act more like the Bourne shell on startup. */
static int act_like_sh;
@ -260,7 +267,7 @@ static const struct {
#if defined (RESTRICTED_SHELL)
{ "restricted", Int, &restricted, (char **)0x0 },
#endif
{ "verbose", Int, &echo_input_at_read, (char **)0x0 },
{ "verbose", Int, &verbose_flag, (char **)0x0 },
{ "version", Int, &do_version, (char **)0x0 },
#if defined (WORDEXP_OPTION)
{ "wordexp", Int, &wordexp_only, (char **)0x0 },
@ -389,9 +396,7 @@ main (argc, argv, env)
xtrace_init ();
#if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS)
# if 1
malloc_set_register (1);
# endif
malloc_set_register (1); /* XXX - change to 1 for malloc debugging */
#endif
check_dev_tty ();
@ -414,7 +419,7 @@ main (argc, argv, env)
mcheck (programming_error, (void (*) ())0);
#endif /* USE_GNU_MALLOC_LIBRARY */
if (setjmp (subshell_top_level))
if (setjmp_sigs (subshell_top_level))
{
argc = subshell_argc;
argv = subshell_argv;
@ -460,7 +465,7 @@ main (argc, argv, env)
/* Find full word arguments first. */
arg_index = parse_long_options (argv, arg_index, argc);
if (want_initial_help)
{
show_shell_usage (stdout, 1);
@ -473,6 +478,8 @@ main (argc, argv, env)
exit (EXECUTION_SUCCESS);
}
echo_input_at_read = verbose_flag; /* --verbose given */
/* All done with full word options; do standard shell option parsing.*/
this_command_name = shell_name; /* for error reporting */
arg_index = parse_shell_options (argv, arg_index, argc);
@ -511,8 +518,6 @@ main (argc, argv, env)
}
this_command_name = (char *)NULL;
cmd_init(); /* initialize the command object caches */
/* First, let the outside world know about our interactive status.
A shell is interactive if the `-i' flag was given, or if all of
the following conditions are met:
@ -568,24 +573,45 @@ main (argc, argv, env)
set_default_locale_vars ();
/*
* M-x term -> TERM=eterm EMACS=22.1 (term:0.96) (eterm)
* M-x shell -> TERM=dumb EMACS=t (no line editing)
* M-x terminal -> TERM=emacs-em7955 EMACS= (line editing)
* M-x term -> TERM=eterm-color INSIDE_EMACS='251,term:0.96' (eterm)
* M-x shell -> TERM='dumb' INSIDE_EMACS='25.1,comint' (no line editing)
*
* Older versions of Emacs may set EMACS to 't' or to something like
* '22.1 (term:0.96)' instead of (or in addition to) setting INSIDE_EMACS.
* They may set TERM to 'eterm' instead of 'eterm-color'. They may have
* a now-obsolete command that sets neither EMACS nor INSIDE_EMACS:
* M-x terminal -> TERM='emacs-em7955' (line editing)
*/
if (interactive_shell)
{
char *term, *emacs;
char *term, *emacs, *inside_emacs;;
int emacs_term, in_emacs;
term = get_string_value ("TERM");
emacs = get_string_value ("EMACS");
inside_emacs = get_string_value ("INSIDE_EMACS");
if (inside_emacs)
{
emacs_term = strstr (inside_emacs, ",term:") != 0;
in_emacs = 1;
}
else if (emacs)
{
/* Infer whether we are in an older Emacs. */
emacs_term = strstr (emacs, " (term:") != 0;
in_emacs = emacs_term || STREQ (emacs, "t");
}
else
in_emacs = emacs_term = 0;
/* Not sure any emacs terminal emulator sets TERM=emacs any more */
no_line_editing |= term && (STREQ (term, "emacs"));
no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb");
no_line_editing |= STREQ (term, "emacs");
no_line_editing |= in_emacs && STREQ (term, "dumb");
/* running_under_emacs == 2 for `eterm' */
running_under_emacs = (emacs != 0) || (term && STREQN (term, "emacs", 5));
running_under_emacs += term && STREQN (term, "eterm", 5) && emacs && strstr (emacs, "term");
running_under_emacs = in_emacs || STREQN (term, "emacs", 5);
running_under_emacs += emacs_term && STREQN (term, "eterm", 5);
if (running_under_emacs)
gnu_error_format = 1;
@ -597,7 +623,7 @@ main (argc, argv, env)
/* Give this shell a place to longjmp to before executing the
startup files. This allows users to press C-c to abort the
lengthy startup. */
code = setjmp (top_level);
code = setjmp_sigs (top_level);
if (code)
{
if (code == EXITPROG || code == ERREXIT)
@ -682,6 +708,9 @@ main (argc, argv, env)
}
#endif
cmd_init (); /* initialize the command object caches */
uwp_init ();
if (command_execution_string)
{
arg_index = bind_args (argv, arg_index, argc, 0);
@ -708,20 +737,27 @@ main (argc, argv, env)
arg_index++;
}
else if (interactive == 0)
/* In this mode, bash is reading a script from stdin, which is a
pipe or redirected file. */
{
/* In this mode, bash is reading a script from stdin, which is a
pipe or redirected file. */
#if defined (BUFFERED_INPUT)
default_buffered_input = fileno (stdin); /* == 0 */
default_buffered_input = fileno (stdin); /* == 0 */
#else
setbuf (default_input, (char *)NULL);
setbuf (default_input, (char *)NULL);
#endif /* !BUFFERED_INPUT */
read_from_stdin = 1;
}
else if (arg_index == argc)
/* "If there are no operands and the -c option is not specified, the -s
option shall be assumed." */
read_from_stdin = 1;
set_bash_input ();
/* Bind remaining args to $1 ... $n */
arg_index = bind_args (argv, arg_index, argc, 1);
if (debugging_mode && locally_skip_execution == 0 && running_setuid == 0 && dollar_vars[1])
if (debugging_mode && locally_skip_execution == 0 && running_setuid == 0 && (reading_shell_script || interactive_shell == 0))
start_debugger ();
/* Do the things that should be done only for interactive shells. */
@ -942,10 +978,12 @@ exit_shell (s)
if (interactive_shell && login_shell && hup_on_exit)
hangup_all_jobs ();
/* If this shell is interactive, terminate all stopped jobs and
restore the original terminal process group. Don't do this if we're
in a subshell and calling exit_shell after, for example, a failed
word expansion. */
/* If this shell is interactive, or job control is active, terminate all
stopped jobs and restore the original terminal process group. Don't do
this if we're in a subshell and calling exit_shell after, for example,
a failed word expansion. We want to do this even if the shell is not
interactive because we set the terminal's process group when job control
is enabled regardless of the interactive status. */
if (subshell_environment == 0)
end_job_control ();
#endif /* JOB_CONTROL */
@ -963,6 +1001,7 @@ sh_exit (s)
#if defined (MALLOC_DEBUG) && defined (USING_BASH_MALLOC)
if (malloc_trace_at_exit)
trace_malloc_stats (get_name_for_error (), (char *)NULL);
/* mlocation_write_table (); */
#endif
exit (s);
@ -1235,8 +1274,20 @@ uidget ()
void
disable_priv_mode ()
{
setuid (current_user.uid);
setgid (current_user.gid);
int e;
if (setuid (current_user.uid) < 0)
{
e = errno;
sys_error (_("cannot set uid to %d: effective uid %d"), current_user.uid, current_user.euid);
#if defined (EXIT_ON_SETUID_FAILURE)
if (e == EAGAIN)
exit (e);
#endif
}
if (setgid (current_user.gid) < 0)
sys_error (_("cannot set gid to %d: effective gid %d"), current_user.gid, current_user.egid);
current_user.euid = current_user.uid;
current_user.egid = current_user.gid;
}
@ -1396,12 +1447,21 @@ start_debugger ()
{
#if defined (DEBUGGER) && defined (DEBUGGER_START_FILE)
int old_errexit;
int r;
old_errexit = exit_immediately_on_error;
exit_immediately_on_error = 0;
maybe_execute_file (DEBUGGER_START_FILE, 1);
function_trace_mode = 1;
r = force_execute_file (DEBUGGER_START_FILE, 1);
if (r < 0)
{
internal_warning (_("cannot start debugger; debugging mode disabled"));
debugging_mode = 0;
}
error_trace_mode = function_trace_mode = debugging_mode;
set_shellopts ();
set_bashopts ();
exit_immediately_on_error += old_errexit;
#endif
@ -1444,7 +1504,7 @@ open_shell_script (script_name)
{
e = errno;
file_error (filename);
exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT);
sh_exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT);
}
free (dollar_vars[0]);
@ -1455,6 +1515,17 @@ open_shell_script (script_name)
exec_argv0 = (char *)NULL;
}
if (file_isdir (filename))
{
#if defined (EISDIR)
errno = EISDIR;
#else
errno = EINVAL;
#endif
file_error (filename);
sh_exit (EX_NOINPUT);
}
#if defined (ARRAY_VARS)
GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
@ -1487,7 +1558,14 @@ open_shell_script (script_name)
{
e = errno;
if ((fstat (fd, &sb) == 0) && S_ISDIR (sb.st_mode))
internal_error (_("%s: is a directory"), filename);
{
#if defined (EISDIR)
errno = EISDIR;
file_error (filename);
#else
internal_error (_("%s: Is a directory"), filename);
#endif
}
else
{
errno = e;
@ -1547,6 +1625,8 @@ open_shell_script (script_name)
init_interactive_script ();
free (filename);
reading_shell_script = 1;
return (fd);
}
@ -1640,6 +1720,9 @@ init_interactive ()
{
expand_aliases = interactive_shell = startup_state = 1;
interactive = 1;
#if defined (HISTORY)
remember_on_history = enable_history_list = 1; /* XXX */
#endif
}
static void
@ -1663,6 +1746,9 @@ init_interactive_script ()
{
init_noninteractive ();
expand_aliases = interactive_shell = startup_state = 1;
#if defined (HISTORY)
remember_on_history = enable_history_list = 1; /* XXX */
#endif
}
void
@ -1693,7 +1779,9 @@ get_current_user_info ()
current_user.shell = savestring ("/bin/sh");
current_user.home_dir = savestring ("/");
}
#if defined (HAVE_GETPWENT)
endpwent ();
#endif
}
}
@ -1703,6 +1791,7 @@ static void
shell_initialize ()
{
char hostname[256];
int should_be_restricted;
/* Line buffer output for stderr and stdout. */
if (shell_initialized == 0)
@ -1741,11 +1830,15 @@ shell_initialize ()
/* Initialize our interface to the tilde expander. */
tilde_initialize ();
#if defined (RESTRICTED_SHELL)
should_be_restricted = shell_is_restricted (shell_name);
#endif
/* Initialize internal and environment variables. Don't import shell
functions from the environment if we are running in privileged or
restricted mode or if the shell is running setuid. */
#if defined (RESTRICTED_SHELL)
initialize_shell_variables (shell_environment, privileged_mode||restricted||running_setuid);
initialize_shell_variables (shell_environment, privileged_mode||restricted||should_be_restricted||running_setuid);
#else
initialize_shell_variables (shell_environment, privileged_mode||running_setuid);
#endif
@ -1763,8 +1856,8 @@ shell_initialize ()
running in privileged or restricted mode or if the shell is running
setuid. */
#if defined (RESTRICTED_SHELL)
initialize_shell_options (privileged_mode||restricted||running_setuid);
initialize_bashopts (privileged_mode||restricted||running_setuid);
initialize_shell_options (privileged_mode||restricted||should_be_restricted||running_setuid);
initialize_bashopts (privileged_mode||restricted||should_be_restricted||running_setuid);
#else
initialize_shell_options (privileged_mode||running_setuid);
initialize_bashopts (privileged_mode||running_setuid);
@ -1793,13 +1886,14 @@ shell_reinitialize ()
/* Things that get 0. */
login_shell = make_login_shell = interactive = executing = 0;
debugging = do_version = line_number = last_command_exit_value = 0;
forced_interactive = interactive_shell = subshell_environment = 0;
forced_interactive = interactive_shell = 0;
subshell_environment = running_in_background = 0;
expand_aliases = 0;
/* XXX - should we set jobs_m_flag to 0 here? */
#if defined (HISTORY)
bash_history_reinit (0);
bash_history_reinit (enable_history_list = 0);
#endif /* HISTORY */
#if defined (RESTRICTED_SHELL)
@ -1808,7 +1902,7 @@ shell_reinitialize ()
/* Ensure that the default startup file is used. (Except that we don't
execute this file for reinitialized shells). */
bashrc_file = "~/.bashrc";
bashrc_file = DEFAULT_BASHRC;
/* Delete all variables and functions. They will be reinitialized when
the environment is parsed. */
@ -1865,6 +1959,9 @@ show_shell_usage (fp, extra)
fprintf (fp, _("Type `%s -c \"help set\"' for more information about shell options.\n"), shell_name);
fprintf (fp, _("Type `%s -c help' for more information about shell builtin commands.\n"), shell_name);
fprintf (fp, _("Use the `bashbug' command to report bugs.\n"));
fprintf (fp, "\n");
fprintf (fp, _("bash home page: <http://www.gnu.org/software/bash>\n"));
fprintf (fp, _("General help using GNU software: <http://www.gnu.org/gethelp/>\n"));
}
}