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c14c8155 | 1 | /* Implementation of the EXECUTE_COMMAND_LINE intrinsic. |
83ffe9cd | 2 | Copyright (C) 2009-2023 Free Software Foundation, Inc. |
f4742991 | 3 | Contributed by François-Xavier Coudert. |
c14c8155 FXC |
4 | |
5 | This file is part of the GNU Fortran runtime library (libgfortran). | |
6 | ||
7 | Libgfortran is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | Libgfortran is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | #include "libgfortran.h" | |
27 | #include <string.h> | |
74544378 | 28 | |
c14c8155 FXC |
29 | #ifdef HAVE_UNISTD_H |
30 | #include <unistd.h> | |
31 | #endif | |
32 | #ifdef HAVE_SYS_WAIT_H | |
33 | #include <sys/wait.h> | |
34 | #endif | |
f8886038 JB |
35 | #ifdef HAVE_POSIX_SPAWN |
36 | #include <spawn.h> | |
a3454130 IS |
37 | # ifdef __APPLE__ |
38 | # include <crt_externs.h> | |
39 | # define environ (*_NSGetEnviron ()) | |
40 | # else | |
f8886038 | 41 | extern char **environ; |
a3454130 | 42 | # endif |
f8886038 | 43 | #endif |
ef536b41 JB |
44 | #if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK) |
45 | #include <signal.h> | |
46 | #endif | |
c14c8155 | 47 | |
b4224aec | 48 | enum { EXEC_SYNCHRONOUS = -2, EXEC_NOERROR = 0, EXEC_SYSTEMFAILED, |
1487cca0 | 49 | EXEC_CHILDFAILED, EXEC_INVALIDCOMMAND }; |
c14c8155 | 50 | static const char *cmdmsg_values[] = |
b4224aec TB |
51 | { "", |
52 | "Termination status of the command-language interpreter cannot be obtained", | |
1487cca0 FXC |
53 | "Execution of child process impossible", |
54 | "Invalid command line" }; | |
c14c8155 FXC |
55 | |
56 | ||
57 | ||
58 | static void | |
59 | set_cmdstat (int *cmdstat, int value) | |
60 | { | |
61 | if (cmdstat) | |
62 | *cmdstat = value; | |
b4224aec | 63 | else if (value > EXEC_NOERROR) |
1487cca0 FXC |
64 | { |
65 | #define MSGLEN 200 | |
66 | char msg[MSGLEN] = "EXECUTE_COMMAND_LINE: "; | |
67 | strncat (msg, cmdmsg_values[value], MSGLEN - strlen(msg) - 1); | |
f4742991 | 68 | runtime_error ("%s", msg); |
1487cca0 | 69 | } |
c14c8155 FXC |
70 | } |
71 | ||
72 | ||
ef536b41 JB |
73 | #if defined(HAVE_WAITPID) && defined(HAVE_SIGACTION) |
74 | static void | |
75 | sigchld_handler (int signum __attribute__((unused))) | |
76 | { | |
77 | while (waitpid ((pid_t)(-1), NULL, WNOHANG) > 0) {} | |
78 | } | |
79 | #endif | |
80 | ||
c14c8155 FXC |
81 | static void |
82 | execute_command_line (const char *command, bool wait, int *exitstat, | |
83 | int *cmdstat, char *cmdmsg, | |
84 | gfc_charlen_type command_len, | |
85 | gfc_charlen_type cmdmsg_len) | |
86 | { | |
87 | /* Transform the Fortran string to a C string. */ | |
581d2326 | 88 | char *cmd = fc_strdup (command, command_len); |
c14c8155 FXC |
89 | |
90 | /* Flush all I/O units before executing the command. */ | |
91 | flush_all_units(); | |
92 | ||
f8886038 | 93 | #if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK) |
c14c8155 FXC |
94 | if (!wait) |
95 | { | |
96 | /* Asynchronous execution. */ | |
97 | pid_t pid; | |
98 | ||
b4224aec | 99 | set_cmdstat (cmdstat, EXEC_NOERROR); |
c14c8155 | 100 | |
ef536b41 JB |
101 | #if defined(HAVE_SIGACTION) && defined(HAVE_WAITPID) |
102 | static bool sig_init_saved; | |
103 | bool sig_init = __atomic_load_n (&sig_init_saved, __ATOMIC_RELAXED); | |
104 | if (!sig_init) | |
105 | { | |
106 | struct sigaction sa; | |
107 | sa.sa_handler = &sigchld_handler; | |
108 | sigemptyset(&sa.sa_mask); | |
109 | sa.sa_flags = SA_RESTART | SA_NOCLDSTOP; | |
110 | sigaction(SIGCHLD, &sa, 0); | |
111 | __atomic_store_n (&sig_init_saved, true, __ATOMIC_RELAXED); | |
112 | } | |
113 | #endif | |
114 | ||
f8886038 JB |
115 | #ifdef HAVE_POSIX_SPAWN |
116 | const char * const argv[] = {"sh", "-c", cmd, NULL}; | |
117 | if (posix_spawn (&pid, "/bin/sh", NULL, NULL, | |
118 | (char * const* restrict) argv, environ)) | |
b4224aec | 119 | set_cmdstat (cmdstat, EXEC_CHILDFAILED); |
f8886038 JB |
120 | #elif defined(HAVE_FORK) |
121 | if ((pid = fork()) < 0) | |
122 | set_cmdstat (cmdstat, EXEC_CHILDFAILED); | |
c14c8155 FXC |
123 | else if (pid == 0) |
124 | { | |
125 | /* Child process. */ | |
126 | int res = system (cmd); | |
127 | _exit (WIFEXITED(res) ? WEXITSTATUS(res) : res); | |
128 | } | |
f8886038 | 129 | #endif |
c14c8155 FXC |
130 | } |
131 | else | |
132 | #endif | |
133 | { | |
134 | /* Synchronous execution. */ | |
135 | int res = system (cmd); | |
136 | ||
b4224aec | 137 | if (res == -1) |
c14c8155 | 138 | set_cmdstat (cmdstat, EXEC_SYSTEMFAILED); |
f8886038 | 139 | #if !defined(HAVE_POSIX_SPAWN) && !defined(HAVE_FORK) |
b4224aec TB |
140 | else if (!wait) |
141 | set_cmdstat (cmdstat, EXEC_SYNCHRONOUS); | |
43b594b4 | 142 | #endif |
1487cca0 FXC |
143 | else if (res == 127 || res == 126 |
144 | #if defined(WEXITSTATUS) && defined(WIFEXITED) | |
145 | || (WIFEXITED(res) && WEXITSTATUS(res) == 127) | |
146 | || (WIFEXITED(res) && WEXITSTATUS(res) == 126) | |
147 | #endif | |
148 | ) | |
149 | /* Shell return codes 126 and 127 mean that the command line could | |
150 | not be executed for various reasons. */ | |
151 | set_cmdstat (cmdstat, EXEC_INVALIDCOMMAND); | |
c14c8155 | 152 | else |
b4224aec TB |
153 | set_cmdstat (cmdstat, EXEC_NOERROR); |
154 | ||
155 | if (res != -1) | |
c14c8155 | 156 | { |
c14c8155 FXC |
157 | #if defined(WEXITSTATUS) && defined(WIFEXITED) |
158 | *exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res; | |
159 | #else | |
160 | *exitstat = res; | |
161 | #endif | |
162 | } | |
163 | } | |
164 | ||
581d2326 JB |
165 | free (cmd); |
166 | ||
c14c8155 | 167 | /* Now copy back to the Fortran string if needed. */ |
3934b625 TK |
168 | if (cmdstat && *cmdstat > EXEC_NOERROR && cmdmsg) |
169 | fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat], | |
c14c8155 | 170 | strlen (cmdmsg_values[*cmdstat])); |
c14c8155 FXC |
171 | } |
172 | ||
173 | ||
174 | extern void | |
175 | execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait, | |
176 | GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat, | |
177 | char *cmdmsg, gfc_charlen_type command_len, | |
178 | gfc_charlen_type cmdmsg_len); | |
179 | export_proto(execute_command_line_i4); | |
180 | ||
181 | void | |
182 | execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait, | |
183 | GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat, | |
184 | char *cmdmsg, gfc_charlen_type command_len, | |
185 | gfc_charlen_type cmdmsg_len) | |
186 | { | |
187 | bool w = wait ? *wait : true; | |
188 | int estat, estat_initial, cstat; | |
189 | ||
190 | if (exitstat) | |
191 | estat_initial = estat = *exitstat; | |
192 | ||
193 | execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL, | |
194 | cmdmsg, command_len, cmdmsg_len); | |
195 | ||
196 | if (exitstat && estat != estat_initial) | |
197 | *exitstat = estat; | |
198 | if (cmdstat) | |
199 | *cmdstat = cstat; | |
200 | } | |
201 | ||
202 | ||
203 | extern void | |
204 | execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait, | |
205 | GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat, | |
206 | char *cmdmsg, gfc_charlen_type command_len, | |
207 | gfc_charlen_type cmdmsg_len); | |
208 | export_proto(execute_command_line_i8); | |
209 | ||
210 | void | |
211 | execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait, | |
212 | GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat, | |
213 | char *cmdmsg, gfc_charlen_type command_len, | |
214 | gfc_charlen_type cmdmsg_len) | |
215 | { | |
216 | bool w = wait ? *wait : true; | |
217 | int estat, estat_initial, cstat; | |
218 | ||
219 | if (exitstat) | |
220 | estat_initial = estat = *exitstat; | |
221 | ||
222 | execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL, | |
223 | cmdmsg, command_len, cmdmsg_len); | |
224 | ||
225 | if (exitstat && estat != estat_initial) | |
226 | *exitstat = estat; | |
227 | if (cmdstat) | |
228 | *cmdstat = cstat; | |
229 | } |