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exec.def

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1This file is exec.def, from which is created exec.c.-
2It implements the builtin "exec" in Bash.-
3-
4Copyright (C) 1987-2015 Free Software Foundation, Inc.-
5-
6This file is part of GNU Bash, the Bourne Again SHell.-
7-
8Bash is free software: you can redistribute it and/or modify-
9it under the terms of the GNU General Public License as published by-
10the Free Software Foundation, either version 3 of the License, or-
11(at your option) any later version.-
12-
13Bash is distributed in the hope that it will be useful,-
14but WITHOUT ANY WARRANTY; without even the implied warranty of-
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
16GNU General Public License for more details.-
17-
18You should have received a copy of the GNU General Public License-
19along with Bash. If not, see <http://www.gnu.org/licenses/>.-
20-
21$PRODUCES exec.c-
22-
23$BUILTIN exec-
24$FUNCTION exec_builtin-
25$SHORT_DOC exec [-cl] [-a name] [command [arguments ...]] [redirection ...]-
26Replace the shell with the given command.-
27-
28Execute COMMAND, replacing this shell with the specified program.-
29ARGUMENTS become the arguments to COMMAND. If COMMAND is not specified,-
30any redirections take effect in the current shell.-
31-
32Options:-
33 -a name pass NAME as the zeroth argument to COMMAND-
34 -c execute COMMAND with an empty environment-
35 -l place a dash in the zeroth argument to COMMAND-
36-
37If the command cannot be executed, a non-interactive shell exits, unless-
38the shell option `execfail' is set.-
39-
40Exit Status:-
41Returns success unless COMMAND is not found or a redirection error occurs.-
42$END-
43-
44#include <config.h>-
45-
46#include "../bashtypes.h"-
47#include "posixstat.h"-
48#include <signal.h>-
49#include <errno.h>-
50-
51#if defined (HAVE_UNISTD_H)-
52# include <unistd.h>-
53#endif-
54-
55#include "../bashansi.h"-
56#include "../bashintl.h"-
57-
58#include "../shell.h"-
59#include "../execute_cmd.h"-
60#include "../findcmd.h"-
61#if defined (JOB_CONTROL)-
62# include "../jobs.h"-
63#endif-
64#include "../flags.h"-
65#include "../trap.h"-
66#if defined (HISTORY)-
67# include "../bashhist.h"-
68#endif-
69#include "common.h"-
70#include "bashgetopt.h"-
71-
72/* Not all systems declare ERRNO in errno.h... and some systems #define it! */-
73#if !defined (errno)-
74extern int errno;-
75#endif /* !errno */-
76-
77extern REDIRECT *redirection_undo_list;-
78extern char *exec_argv0;-
79-
80int no_exit_on_failed_exec;-
81-
82/* If the user wants this to look like a login shell, then-
83 prepend a `-' onto NAME and return the new name. */-
84static char *-
85mkdashname (name)-
86 char *name;-
87{-
88 char *ret;-
89-
90 ret = (char *)xmalloc (2 + strlen (name));-
91 ret[0] = '-';-
92 strcpy (ret + 1, name);-
93 return ret;
never executed: return ret;
0
94}-
95-
96int-
97exec_builtin (list)-
98 WORD_LIST *list;-
99{-
100 int exit_value = EXECUTION_FAILURE;-
101 int cleanenv, login, opt;-
102 char *argv0, *command, **args, **env, *newname, *com2;-
103-
104 cleanenv = login = 0;-
105 exec_argv0 = argv0 = (char *)NULL;-
106-
107 reset_internal_getopt ();-
108 while ((opt = internal_getopt (list, "cla:")) != -1)
(opt = interna..."cla:")) != -1Description
TRUEevaluated 5 times by 1 test
Evaluated by:
  • Self test
FALSEevaluated 262 times by 1 test
Evaluated by:
  • Self test
5-262
109 {-
110 switch (opt)-
111 {-
112 case 'c':
never executed: case 'c':
0
113 cleanenv = 1;-
114 break;
never executed: break;
0
115 case 'l':
never executed: case 'l':
0
116 login = 1;-
117 break;
never executed: break;
0
118 case 'a':
never executed: case 'a':
0
119 argv0 = list_optarg;-
120 break;
never executed: break;
0
121 CASE_HELPOPT;
never executed: return (258);
never executed: case -99:
0
122 default:
executed 5 times by 1 test: default:
Executed by:
  • Self test
5
123 builtin_usage ();-
124 return (EX_USAGE);
executed 5 times by 1 test: return (258);
Executed by:
  • Self test
5
125 }-
126 }-
127 list = loptend;-
128-
129 /* First, let the redirections remain. */-
130 dispose_redirects (redirection_undo_list);-
131 redirection_undo_list = (REDIRECT *)NULL;-
132-
133 if (list == 0)
list == 0Description
TRUEevaluated 259 times by 1 test
Evaluated by:
  • Self test
FALSEevaluated 3 times by 1 test
Evaluated by:
  • Self test
3-259
134 return (EXECUTION_SUCCESS);
executed 259 times by 1 test: return (0);
Executed by:
  • Self test
259
135-
136#if defined (RESTRICTED_SHELL)-
137 if (restricted)
restrictedDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
1-2
138 {-
139 sh_restricted ((char *)NULL);-
140 return (EXECUTION_FAILURE);
executed 1 time by 1 test: return (1);
Executed by:
  • Self test
1
141 }-
142#endif /* RESTRICTED_SHELL */-
143-
144 args = strvec_from_word_list (list, 1, 0, (int *)NULL);-
145 env = (char **)0;-
146-
147 /* A command with a slash anywhere in its name is not looked up in $PATH. */-
148 command = absolute_program (args[0]) ? args[0] : search_for_command (args[0], 1);
absolute_program (args[0])Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-2
149-
150 if (command == 0)
command == 0Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
151 {-
152 if (file_isdir (args[0]))
file_isdir (args[0])Description
TRUEnever evaluated
FALSEnever evaluated
0
153 {-
154#if defined (EISDIR)-
155 builtin_error (_("%s: cannot execute: %s"), args[0], strerror (EISDIR));-
156#else-
157 builtin_error (_("%s: cannot execute: %s"), args[0], strerror (errno));-
158#endif-
159 exit_value = EX_NOEXEC;-
160 }
never executed: end of block
0
161 else-
162 {-
163 sh_notfound (args[0]);-
164 exit_value = EX_NOTFOUND; /* As per Posix.2, 3.14.6 */-
165 }
never executed: end of block
0
166 goto failed_exec;
never executed: goto failed_exec;
0
167 }-
168-
169 com2 = full_pathname (command);-
170 if (com2)
com2Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-2
171 {-
172 if (command != args[0])
command != args[0]Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
173 free (command);
never executed: sh_xfree((command), "./exec.def", 173);
0
174 command = com2;-
175 }
executed 2 times by 1 test: end of block
Executed by:
  • Self test
2
176-
177 if (argv0)
argv0Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
178 {-
179 free (args[0]);-
180 args[0] = login ? mkdashname (argv0) : savestring (argv0);
loginDescription
TRUEnever evaluated
FALSEnever evaluated
0
181 exec_argv0 = savestring (args[0]);-
182 }
never executed: end of block
0
183 else if (login)
loginDescription
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
184 {-
185 newname = mkdashname (args[0]);-
186 free (args[0]);-
187 args[0] = newname;-
188 }
never executed: end of block
0
189-
190 /* Decrement SHLVL by 1 so a new shell started here has the same value,-
191 preserving the appearance. After we do that, we need to change the-
192 exported environment to include the new value. If we've already forked-
193 and are in a subshell, we don't want to decrement the shell level,-
194 since we are `increasing' the level */-
195-
196 if (cleanenv == 0 && (subshell_environment & SUBSHELL_PAREN) == 0)
cleanenv == 0Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
(subshell_envi...t & 0x02) == 0Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
0-2
197 adjust_shell_level (-1);
executed 1 time by 1 test: adjust_shell_level (-1);
Executed by:
  • Self test
1
198-
199 if (cleanenv)
cleanenvDescription
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
200 {-
201 env = strvec_create (1);-
202 env[0] = (char *)0;-
203 }
never executed: end of block
0
204 else-
205 { -
206 maybe_make_export_env ();-
207 env = export_env;-
208 }
executed 2 times by 1 test: end of block
Executed by:
  • Self test
2
209-
210#if defined (HISTORY)-
211 if (interactive_shell && subshell_environment == 0)
interactive_shellDescription
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
subshell_environment == 0Description
TRUEnever evaluated
FALSEnever evaluated
0-2
212 maybe_save_shell_history ();
never executed: maybe_save_shell_history ();
0
213#endif /* HISTORY */-
214-
215 restore_original_signals ();-
216-
217#if defined (JOB_CONTROL)-
218 if (subshell_environment == 0)
subshell_environment == 0Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
1
219 end_job_control ();
executed 1 time by 1 test: end_job_control ();
Executed by:
  • Self test
1
220 if (interactive || job_control)
interactiveDescription
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
job_controlDescription
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • Self test
0-2
221 default_tty_job_signals (); /* undo initialize_job_signals */
never executed: default_tty_job_signals ();
0
222#endif /* JOB_CONTROL */-
223-
224 exit_value = shell_execve (command, args, env);-
225-
226 /* We have to set this to NULL because shell_execve has called realloc()-
227 to stuff more items at the front of the array, which may have caused-
228 the memory to be freed by realloc(). We don't want to free it twice. */-
229 args = (char **)NULL;-
230 if (cleanenv == 0)
cleanenv == 0Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-2
231 adjust_shell_level (1);
executed 2 times by 1 test: adjust_shell_level (1);
Executed by:
  • Self test
2
232-
233 if (exit_value == EX_NOTFOUND) /* no duplicate error message */
exit_value == 127Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-2
234 goto failed_exec;
executed 2 times by 1 test: goto failed_exec;
Executed by:
  • Self test
2
235 else if (executable_file (command) == 0)
executable_file (command) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
236 {-
237 builtin_error (_("%s: cannot execute: %s"), command, strerror (errno));-
238 exit_value = EX_NOEXEC; /* As per Posix.2, 3.14.6 */-
239 }
never executed: end of block
0
240 else-
241 file_error (command);
never executed: file_error (command);
0
242-
243failed_exec:
code before this statement never executed: failed_exec:
0
244 FREE (command);
executed 2 times by 1 test: sh_xfree((command), "./exec.def", 244);
Executed by:
  • Self test
commandDescription
TRUEevaluated 2 times by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
0-2
245-
246 if (subshell_environment || (interactive == 0 && no_exit_on_failed_exec == 0))
subshell_environmentDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
interactive == 0Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
no_exit_on_failed_exec == 0Description
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
0-1
247 exit_shell (exit_value);
executed 1 time by 1 test: exit_shell (exit_value);
Executed by:
  • Self test
1
248-
249 if (args)
argsDescription
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
0-1
250 strvec_dispose (args);
never executed: strvec_dispose (args);
0
251-
252 if (env && env != export_env)
envDescription
TRUEevaluated 1 time by 1 test
Evaluated by:
  • Self test
FALSEnever evaluated
env != export_envDescription
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
0-1
253 strvec_dispose (env);
never executed: strvec_dispose (env);
0
254-
255 initialize_traps ();-
256 initialize_signals (1);-
257-
258#if defined (JOB_CONTROL)-
259 if (interactive_shell || job_control)
interactive_shellDescription
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
job_controlDescription
TRUEnever evaluated
FALSEevaluated 1 time by 1 test
Evaluated by:
  • Self test
0-1
260 restart_job_control ();
never executed: restart_job_control ();
0
261#endif /* JOB_CONTROL */-
262-
263 return (exit_value);
executed 1 time by 1 test: return (exit_value);
Executed by:
  • Self test
1
264}-
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