1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Generic MSDOS 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_STRING_H
29 #include <string.h>
30 #endif
31 #ifdef HAVE_STDLIB_H
32 #include <stdlib.h>
33 #endif
34
35 #include "safe-ctype.h"
36 #include <process.h>
37
38 /* The structure we keep in obj->sysdep. */
39
40 #define PEX_MSDOS_FILE_COUNT 3
41
42 #define PEX_MSDOS_FD_OFFSET 10
43
44 struct pex_msdos
45 {
46 /* An array of file names. We refer to these using file descriptors
47 of 10 + array index. */
48 const char *files[PEX_MSDOS_FILE_COUNT];
49 /* Exit statuses of programs which have been run. */
50 int *statuses;
51 };
52
53 static int pex_msdos_open (struct pex_obj *, const char *, int);
54 static int pex_msdos_open (struct pex_obj *, const char *, int);
55 static int pex_msdos_fdindex (struct pex_msdos *, int);
56 static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
57 char * const *, char * const *,
58 int, int, int, int,
59 int, const char **, int *);
60 static int pex_msdos_close (struct pex_obj *, int);
61 static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
62 int, const char **, int *);
63 static void pex_msdos_cleanup (struct pex_obj *);
64
65 /* The list of functions we pass to the common routines. */
66
67 const struct pex_funcs funcs =
68 {
69 pex_msdos_open,
70 pex_msdos_open,
71 pex_msdos_exec_child,
72 pex_msdos_close,
73 pex_msdos_wait,
74 NULL, /* pipe */
75 NULL, /* fdopenr */
76 NULL, /* fdopenw */
77 pex_msdos_cleanup
78 };
79
80 /* Return a newly initialized pex_obj structure. */
81
82 struct pex_obj *
83 pex_init (int flags, const char *pname, const char *tempbase)
84 {
85 struct pex_obj *ret;
86 int i;
87
88 /* MSDOS does not support pipes. */
89 flags &= ~ PEX_USE_PIPES;
90
91 ret = pex_init_common (flags, pname, tempbase, funcs);
92
93 ret->sysdep = XNEW (struct pex_msdos);
94 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
95 ret->files[i] = NULL;
96 ret->statuses = NULL;
97
98 return ret;
99 }
100
101 /* Open a file. FIXME: We ignore the binary argument, since we have
102 no way to handle it. */
103
104 static int
105 pex_msdos_open (struct pex_obj *obj, const char *name,
106 int binary ATTRIBUTE_UNUSED)
107 {
108 struct pex_msdos *ms;
109 int i;
110
111 ms = (struct pex_msdos *) obj->sysdep;
112
113 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
114 {
115 if (ms->files[i] == NULL)
116 {
117 ms->files[i] = xstrdup (name);
118 return i + PEX_MSDOS_FD_OFFSET;
119 }
120 }
121
122 abort ();
123 }
124
125 /* Get the index into msdos->files associated with an open file
126 descriptor. */
127
128 static int
129 pex_msdos_fdindex (struct pex_msdos *ms, int fd)
130 {
131 fd -= PEX_MSDOS_FD_OFFSET;
132 if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
133 abort ();
134 return fd;
135 }
136
137
138 /* Close a file. */
139
140 static int
141 pex_msdos_close (struct pex_obj *obj, int fd)
142 {
143 struct pex_msdos *ms;
144 int fdinex;
145
146 ms = (struct pex_msdos *) obj->sysdep;
147 fdindex = pe_msdos_fdindex (ms, fd);
148 free (ms->files[fdindex]);
149 ms->files[fdindex] = NULL;
150 }
151
152 /* Execute a child. */
153
154 static pid_t
155 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
156 char * const * argv, char * const * env, int in, int out,
157 int toclose ATTRIBUTE_UNUSED,
158 int errdes ATTRIBUTE_UNUSED, const char **errmsg,
159 int *err)
160 {
161 struct pex_msdos *ms;
162 char *temp_base;
163 int temp_base_allocated;
164 char *rf;
165 int inindex;
166 char *infile;
167 int outindex;
168 char *outfile;
169 char *scmd;
170 FILE *argfile;
171 int i;
172 int status;
173
174 ms = (struct pex_msdos *) obj->sysdep;
175
176 /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
177 and PEX_STDERR_TO_STDOUT. */
178
179 temp_base = obj->temp_base;
180 if (temp_base != NULL)
181 temp_base_allocated = 0;
182 else
183 {
184 temp_base = choose_temp_base ();
185 temp_base_allocated = 1;
186 }
187
188 rf = concat (temp_base, ".gp", NULL);
189
190 if (temp_base_allocated)
191 free (temp_base);
192
193 if (in == STDIN_FILE_NO)
194 {
195 inindex = -1;
196 infile = "";
197 }
198 else
199 {
200 inindex = pex_msdos_fdindex (ms, in);
201 infile = ms->files[inindex];
202 }
203
204 if (out == STDOUT_FILE_NO)
205 {
206 outindex = -1;
207 outfile = "";
208 }
209 else
210 {
211 outindex = pex_msdos_fdindex (ms, out);
212 outfile = ms->files[outindex];
213 }
214
215 scmd = XNEWVEC (char, strlen (program)
216 + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
217 + strlen (rf)
218 + strlen (infile)
219 + strlen (outfile)
220 + 10);
221 sprintf (scmd, "%s%s @%s%s%s%s%s",
222 program,
223 (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
224 rf,
225 inindex != -1 ? " <" : "",
226 infile,
227 outindex != -1 ? " >" : "",
228 outfile);
229
230 argfile = fopen (rf, "w");
231 if (argfile == NULL)
232 {
233 *err = errno;
234 free (scmd);
235 free (rf);
236 *errmsg = "cannot open temporary command file";
237 return (pid_t) -1;
238 }
239
240 for (i = 1; argv[i] != NULL; ++i)
241 {
242 char *p;
243
244 for (p = argv[i]; *p != '\0'; ++p)
245 {
246 if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
247 putc ('\\', argfile);
248 putc (*p, argfile);
249 }
250 putc ('\n', argfile);
251 }
252
253 fclose (argfile);
254
255 status = system (scmd);
256
257 if (status == -1)
258 {
259 *err = errno;
260 remove (rf);
261 free (scmd);
262 free (rf);
263 *errmsg = "system";
264 return (pid_t) -1;
265 }
266
267 remove (rf);
268 free (scmd);
269 free (rf);
270
271 /* Save the exit status for later. When we are called, obj->count
272 is the number of children which have executed before this
273 one. */
274 ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
275 ms->statuses[obj->count] = status;
276
277 return (pid_t) obj->count;
278 }
279
280 /* Wait for a child process to complete. Actually the child process
281 has already completed, and we just need to return the exit
282 status. */
283
284 static pid_t
285 pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status,
286 struct pex_time *time, int done ATTRIBUTE_UNUSED,
287 const char **errmsg ATTRIBUTE_UNUSED,
288 int *err ATTRIBUTE_UNUSED)
289 {
290 struct pex_msdos *ms;
291
292 ms = (struct pex_msdos *) obj->sysdep;
293
294 if (time != NULL)
295 memset (time, 0, sizeof *time);
296
297 *status = ms->statuses[pid];
298
299 return 0;
300 }
301
302 /* Clean up the pex_msdos structure. */
303
304 static void
305 pex_msdos_cleanup (struct pex_obj *obj)
306 {
307 struct pex_msdos *ms;
308 int i;
309
310 ms = (struct pex_msdos *) obj->sysdep;
311 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
312 free (msdos->files[i]);
313 free (msdos->statuses);
314 free (msdos);
315 obj->sysdep = NULL;
316 }