1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. DJGPP specialization.
3 Copyright (C) 1996-2023 Free Software Foundation, Inc.
4
5 This file is part of the libiberty library.
6 Libiberty is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 Libiberty is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public
17 License along with libiberty; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
20
21 #include "pex-common.h"
22
23 #include <stdio.h>
24 #include <errno.h>
25 #ifdef NEED_DECLARATION_ERRNO
26 extern int errno;
27 #endif
28 #ifdef HAVE_STDLIB_H
29 #include <stdlib.h>
30 #endif
31 #include <string.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <sys/stat.h>
35 #include <process.h>
36
37 /* Use ECHILD if available, otherwise use EINVAL. */
38 #ifdef ECHILD
39 #define PWAIT_ERROR ECHILD
40 #else
41 #define PWAIT_ERROR EINVAL
42 #endif
43
44 static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
45 static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
46 static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
47 char * const *, char * const *,
48 int, int, int, int,
49 const char **, int *);
50 static int pex_djgpp_close (struct pex_obj *, int);
51 static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
52 int, const char **, int *);
53
54 /* The list of functions we pass to the common routines. */
55
56 const struct pex_funcs funcs =
57 {
58 pex_djgpp_open_read,
59 pex_djgpp_open_write,
60 pex_djgpp_exec_child,
61 pex_djgpp_close,
62 pex_djgpp_wait,
63 NULL, /* pipe */
64 NULL, /* fdopenr */
65 NULL, /* fdopenw */
66 NULL /* cleanup */
67 };
68
69 /* Return a newly initialized pex_obj structure. */
70
71 struct pex_obj *
72 pex_init (int flags, const char *pname, const char *tempbase)
73 {
74 /* DJGPP does not support pipes. */
75 flags &= ~ PEX_USE_PIPES;
76 return pex_init_common (flags, pname, tempbase, &funcs);
77 }
78
79 /* Open a file for reading. */
80
81 static int
82 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
83 const char *name, int binary)
84 {
85 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
86 }
87
88 /* Open a file for writing. */
89
90 static int
91 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
92 const char *name, int binary, int append)
93 {
94 /* Note that we can't use O_EXCL here because gcc may have already
95 created the temporary file via make_temp_file. */
96 if (append)
97 return -1;
98 return open (name,
99 (O_WRONLY | O_CREAT | O_TRUNC
100 | (binary ? O_BINARY : O_TEXT)),
101 S_IRUSR | S_IWUSR);
102 }
103
104 /* Close a file. */
105
106 static int
107 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
108 {
109 return close (fd);
110 }
111
112 /* Execute a child. */
113
114 static pid_t
115 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
116 char * const * argv, char * const * env,
117 int in, int out, int errdes,
118 int toclose ATTRIBUTE_UNUSED, const char **errmsg,
119 int *err)
120 {
121 int org_in, org_out, org_errdes;
122 int status;
123 int *statuses;
124
125 org_in = -1;
126 org_out = -1;
127 org_errdes = -1;
128
129 if (in != STDIN_FILE_NO)
130 {
131 org_in = dup (STDIN_FILE_NO);
132 if (org_in < 0)
133 {
134 *err = errno;
135 *errmsg = "dup";
136 return (pid_t) -1;
137 }
138 if (dup2 (in, STDIN_FILE_NO) < 0)
139 {
140 *err = errno;
141 *errmsg = "dup2";
142 return (pid_t) -1;
143 }
144 if (close (in) < 0)
145 {
146 *err = errno;
147 *errmsg = "close";
148 return (pid_t) -1;
149 }
150 }
151
152 if (out != STDOUT_FILE_NO)
153 {
154 org_out = dup (STDOUT_FILE_NO);
155 if (org_out < 0)
156 {
157 *err = errno;
158 *errmsg = "dup";
159 return (pid_t) -1;
160 }
161 if (dup2 (out, STDOUT_FILE_NO) < 0)
162 {
163 *err = errno;
164 *errmsg = "dup2";
165 return (pid_t) -1;
166 }
167 if (close (out) < 0)
168 {
169 *err = errno;
170 *errmsg = "close";
171 return (pid_t) -1;
172 }
173 }
174
175 if (errdes != STDERR_FILE_NO
176 || (flags & PEX_STDERR_TO_STDOUT) != 0)
177 {
178 org_errdes = dup (STDERR_FILE_NO);
179 if (org_errdes < 0)
180 {
181 *err = errno;
182 *errmsg = "dup";
183 return (pid_t) -1;
184 }
185 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
186 STDERR_FILE_NO) < 0)
187 {
188 *err = errno;
189 *errmsg = "dup2";
190 return (pid_t) -1;
191 }
192 if (errdes != STDERR_FILE_NO)
193 {
194 if (close (errdes) < 0)
195 {
196 *err = errno;
197 *errmsg = "close";
198 return (pid_t) -1;
199 }
200 }
201 }
202
203 if (env)
204 status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
205 (P_WAIT, executable, argv, env));
206 else
207 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
208 (P_WAIT, executable, argv));
209
210 if (status == -1)
211 {
212 *err = errno;
213 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
214 }
215
216 if (in != STDIN_FILE_NO)
217 {
218 if (dup2 (org_in, STDIN_FILE_NO) < 0)
219 {
220 *err = errno;
221 *errmsg = "dup2";
222 return (pid_t) -1;
223 }
224 if (close (org_in) < 0)
225 {
226 *err = errno;
227 *errmsg = "close";
228 return (pid_t) -1;
229 }
230 }
231
232 if (out != STDOUT_FILE_NO)
233 {
234 if (dup2 (org_out, STDOUT_FILE_NO) < 0)
235 {
236 *err = errno;
237 *errmsg = "dup2";
238 return (pid_t) -1;
239 }
240 if (close (org_out) < 0)
241 {
242 *err = errno;
243 *errmsg = "close";
244 return (pid_t) -1;
245 }
246 }
247
248 if (errdes != STDERR_FILE_NO
249 || (flags & PEX_STDERR_TO_STDOUT) != 0)
250 {
251 if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
252 {
253 *err = errno;
254 *errmsg = "dup2";
255 return (pid_t) -1;
256 }
257 if (close (org_errdes) < 0)
258 {
259 *err = errno;
260 *errmsg = "close";
261 return (pid_t) -1;
262 }
263 }
264
265 /* Save the exit status for later. When we are called, obj->count
266 is the number of children which have executed before this
267 one. */
268 statuses = (int *) obj->sysdep;
269 statuses = XRESIZEVEC (int, statuses, obj->count + 1);
270 statuses[obj->count] = status;
271 obj->sysdep = (void *) statuses;
272
273 return (pid_t) obj->count;
274 }
275
276 /* Wait for a child process to complete. Actually the child process
277 has already completed, and we just need to return the exit
278 status. */
279
280 static pid_t
281 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
282 struct pex_time *time, int done ATTRIBUTE_UNUSED,
283 const char **errmsg ATTRIBUTE_UNUSED,
284 int *err ATTRIBUTE_UNUSED)
285 {
286 int *statuses;
287
288 if (time != NULL)
289 memset (time, 0, sizeof *time);
290
291 statuses = (int *) obj->sysdep;
292 *status = statuses[pid];
293
294 return 0;
295 }