1 /* pspp - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2009, 2010, 2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
31 #include "data/settings.h"
32 #include "language/command.h"
33 #include "language/lexer/lexer.h"
34 #include "libpspp/assertion.h"
35 #include "libpspp/compiler.h"
36 #include "libpspp/i18n.h"
37 #include "libpspp/message.h"
38 #include "libpspp/str.h"
39 #include "libpspp/string-array.h"
40 #include "libpspp/temp-file.h"
41 #include "output/text-item.h"
43 #include "gl/intprops.h"
44 #include "gl/localcharset.h"
45 #include "gl/read-file.h"
46 #include "gl/timespec.h"
47 #include "gl/xalloc.h"
48 #include "gl/xmalloca.h"
51 #define _(msgid) gettext (msgid)
52 #define N_(msgid) msgid
56 run_commands (const struct string_array *commands, double time_limit)
58 if (time_limit != DBL_MAX)
60 msg (SE, _("Time limit not supported on this platform."));
64 for (size_t i = 0; i < commands->n; i++)
66 /* XXX No way to capture command output */
67 char *s = recode_string (locale_charset (), "UTF-8",
68 commands->strings[i], -1);
69 int retval = system (s);
74 msg (SE, _("%s: Command exited with status %d."),
75 commands->strings[i], retval);
83 run_command (const char *command, struct timespec timeout)
85 /* Same exit codes used by 'sh'. */
87 EXIT_CANNOT_INVOKE = 126,
91 /* Create a temporary file to capture command output. */
92 FILE *output_file = create_temp_file ();
95 msg (SE, _("Failed to create temporary file (%s)."), strerror (errno));
99 int dev_null_fd = open ("/dev/null", O_RDONLY);
102 msg (SE, _("/dev/null: Failed to open (%s)."), strerror (errno));
103 fclose (output_file);
107 char *locale_command = recode_string (locale_charset (), "UTF-8",
114 fclose (output_file);
115 free (locale_command);
117 msg (SE, _("Couldn't fork: %s."), strerror (errno));
122 /* Running in the child. */
124 /* Set up timeout. */
125 if (timeout.tv_sec < TYPE_MAXIMUM (time_t))
127 signal (SIGALRM, SIG_DFL);
129 struct timespec left = timespec_sub (timeout, current_timespec ());
130 if (timespec_sign (left) <= 0)
133 struct itimerval it = {
135 .tv_sec = left.tv_sec,
136 .tv_usec = left.tv_nsec / 1000
139 setitimer (ITIMER_REAL, &it, NULL);
142 /* Set up file descriptors:
143 - /dev/null for stdin
144 - Temporary file to capture stdout and stderr.
145 - Close everything else.
147 dup2 (dev_null_fd, 0);
148 dup2 (fileno (output_file), 1);
149 dup2 (fileno (output_file), 2);
151 for (int fd = 3; fd < 256; fd++)
154 /* Choose the shell. */
155 const char *shell = getenv ("SHELL");
159 /* Run subprocess. */
160 execl (shell, shell, "-c", locale_command, NULL);
162 /* Failed to start the shell. */
163 _exit (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
166 /* Running in the parent. */
168 free (locale_command);
170 /* Wait for child to exit. */
175 pid_t retval = waitpid (pid, &status, 0);
193 msg (SW, _("While running \"%s\", waiting for child process "
195 command, strerror (errno));
199 if (WIFSIGNALED (status))
201 int signum = WTERMSIG (status);
202 if (signum == SIGALRM)
203 msg (SW, _("Command \"%s\" timed out."), command);
205 msg (SW, _("Command \"%s\" terminated by signal %d."), command, signum);
208 else if (WIFEXITED (status) && WEXITSTATUS (status))
210 int exit_code = WEXITSTATUS (status);
211 const char *detail = (exit_code == EXIT_ENOENT
212 ? _("Command or shell not found")
213 : exit_code == EXIT_CANNOT_INVOKE
214 ? _("Could not invoke command or shell")
217 msg (SW, _("Command \"%s\" exited with status %d (%s)."),
218 command, exit_code, detail);
220 msg (SW, _("Command \"%s\" exited with status %d."),
225 rewind (output_file);
227 char *locale_output = fread_file (output_file, 0, &length);
230 msg (SW, _("Command \"%s\" output could not be read (%s)."),
231 command, strerror (errno));
236 char *output = recode_string ("UTF-8", locale_charset (),
239 /* Drop final new-line, if any. */
240 char *end = strchr (output, '\0');
241 if (end > output && end[-1] == '\n')
244 text_item_submit (text_item_create_nocopy (TEXT_ITEM_LOG, output));
246 free (locale_output);
252 run_commands (const struct string_array *commands, double time_limit)
254 struct timespec timeout = timespec_add (dtotimespec (time_limit),
255 current_timespec ());
257 for (size_t i = 0; i < commands->n; i++)
259 if (!run_command (commands->strings[i], timeout))
268 cmd_host (struct lexer *lexer, struct dataset *ds UNUSED)
270 if (settings_get_safer_mode ())
272 msg (SE, _("This command not allowed when the %s option is set."), "SAFER");
276 if (!lex_force_match_id (lexer, "COMMAND")
277 || !lex_force_match (lexer, T_EQUALS)
278 || !lex_force_match (lexer, T_LBRACK)
279 || !lex_force_string (lexer))
282 struct string_array commands = STRING_ARRAY_INITIALIZER;
283 while (lex_token (lexer) == T_STRING)
285 string_array_append (&commands, lex_tokcstr (lexer));
288 if (!lex_force_match (lexer, T_RBRACK))
290 string_array_destroy (&commands);
294 double time_limit = DBL_MAX;
295 if (lex_match_id (lexer, "TIMELIMIT"))
297 if (!lex_force_match (lexer, T_EQUALS)
298 || !lex_force_num (lexer))
300 string_array_destroy (&commands);
304 double num = lex_number (lexer);
306 time_limit = num < 0.0 ? 0.0 : num;
309 enum cmd_result result = lex_end_of_command (lexer);
310 if (result == CMD_SUCCESS && !run_commands (&commands, time_limit))
311 result = CMD_FAILURE;
312 string_array_destroy (&commands);