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, 1997, 1998, 1999, 2000, 2001, 2003, 2005
4 Free Software Foundation, Inc.
5
6 This file is part of the libiberty library.
7 Libiberty is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11
12 Libiberty is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public
18 License along with libiberty; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include "pex-common.h"
23
24 #include <stdio.h>
25 #include <errno.h>
26 #ifdef NEED_DECLARATION_ERRNO
27 extern int errno;
28 #endif
29 #ifdef HAVE_STDLIB_H
30 #include <stdlib.h>
31 #endif
32 #include <string.h>
33 #include <fcntl.h>
34 #include <unistd.h>
35 #include <sys/stat.h>
36 #include <process.h>
37
38 /* Use ECHILD if available, otherwise use EINVAL. */
39 #ifdef ECHILD
40 #define PWAIT_ERROR ECHILD
41 #else
42 #define PWAIT_ERROR EINVAL
43 #endif
44
45 static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
46 static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
47 static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
48 char * const *, char * const *,
49 int, int, int, int,
50 const char **, int *);
51 static int pex_djgpp_close (struct pex_obj *, int);
52 static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
53 int, const char **, int *);
54
55 /* The list of functions we pass to the common routines. */
56
57 const struct pex_funcs funcs =
58 {
59 pex_djgpp_open_read,
60 pex_djgpp_open_write,
61 pex_djgpp_exec_child,
62 pex_djgpp_close,
63 pex_djgpp_wait,
64 NULL, /* pipe */
65 NULL, /* fdopenr */
66 NULL, /* fdopenw */
67 NULL /* cleanup */
68 };
69
70 /* Return a newly initialized pex_obj structure. */
71
72 struct pex_obj *
pex_init(int flags,const char * pname,const char * tempbase)73 pex_init (int flags, const char *pname, const char *tempbase)
74 {
75 /* DJGPP does not support pipes. */
76 flags &= ~ PEX_USE_PIPES;
77 return pex_init_common (flags, pname, tempbase, &funcs);
78 }
79
80 /* Open a file for reading. */
81
82 static int
pex_djgpp_open_read(struct pex_obj * obj ATTRIBUTE_UNUSED,const char * name,int binary)83 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
84 const char *name, int binary)
85 {
86 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
87 }
88
89 /* Open a file for writing. */
90
91 static int
pex_djgpp_open_write(struct pex_obj * obj ATTRIBUTE_UNUSED,const char * name,int binary,int append)92 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
93 const char *name, int binary, int append)
94 {
95 /* Note that we can't use O_EXCL here because gcc may have already
96 created the temporary file via make_temp_file. */
97 if (append)
98 return -1;
99 return open (name,
100 (O_WRONLY | O_CREAT | O_TRUNC
101 | (binary ? O_BINARY : O_TEXT)),
102 S_IRUSR | S_IWUSR);
103 }
104
105 /* Close a file. */
106
107 static int
pex_djgpp_close(struct pex_obj * obj ATTRIBUTE_UNUSED,int fd)108 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
109 {
110 return close (fd);
111 }
112
113 /* Execute a child. */
114
115 static pid_t
pex_djgpp_exec_child(struct pex_obj * obj,int flags,const char * executable,char * const * argv,char * const * env,int in,int out,int errdes,int toclose ATTRIBUTE_UNUSED,const char ** errmsg,int * err)116 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
117 char * const * argv, char * const * env,
118 int in, int out, int errdes,
119 int toclose ATTRIBUTE_UNUSED, const char **errmsg,
120 int *err)
121 {
122 int org_in, org_out, org_errdes;
123 int status;
124 int *statuses;
125
126 org_in = -1;
127 org_out = -1;
128 org_errdes = -1;
129
130 if (in != STDIN_FILE_NO)
131 {
132 org_in = dup (STDIN_FILE_NO);
133 if (org_in < 0)
134 {
135 *err = errno;
136 *errmsg = "dup";
137 return (pid_t) -1;
138 }
139 if (dup2 (in, STDIN_FILE_NO) < 0)
140 {
141 *err = errno;
142 *errmsg = "dup2";
143 return (pid_t) -1;
144 }
145 if (close (in) < 0)
146 {
147 *err = errno;
148 *errmsg = "close";
149 return (pid_t) -1;
150 }
151 }
152
153 if (out != STDOUT_FILE_NO)
154 {
155 org_out = dup (STDOUT_FILE_NO);
156 if (org_out < 0)
157 {
158 *err = errno;
159 *errmsg = "dup";
160 return (pid_t) -1;
161 }
162 if (dup2 (out, STDOUT_FILE_NO) < 0)
163 {
164 *err = errno;
165 *errmsg = "dup2";
166 return (pid_t) -1;
167 }
168 if (close (out) < 0)
169 {
170 *err = errno;
171 *errmsg = "close";
172 return (pid_t) -1;
173 }
174 }
175
176 if (errdes != STDERR_FILE_NO
177 || (flags & PEX_STDERR_TO_STDOUT) != 0)
178 {
179 org_errdes = dup (STDERR_FILE_NO);
180 if (org_errdes < 0)
181 {
182 *err = errno;
183 *errmsg = "dup";
184 return (pid_t) -1;
185 }
186 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
187 STDERR_FILE_NO) < 0)
188 {
189 *err = errno;
190 *errmsg = "dup2";
191 return (pid_t) -1;
192 }
193 if (errdes != STDERR_FILE_NO)
194 {
195 if (close (errdes) < 0)
196 {
197 *err = errno;
198 *errmsg = "close";
199 return (pid_t) -1;
200 }
201 }
202 }
203
204 if (env)
205 status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
206 (P_WAIT, executable, argv, env));
207 else
208 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
209 (P_WAIT, executable, argv));
210
211 if (status == -1)
212 {
213 *err = errno;
214 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
215 }
216
217 if (in != STDIN_FILE_NO)
218 {
219 if (dup2 (org_in, STDIN_FILE_NO) < 0)
220 {
221 *err = errno;
222 *errmsg = "dup2";
223 return (pid_t) -1;
224 }
225 if (close (org_in) < 0)
226 {
227 *err = errno;
228 *errmsg = "close";
229 return (pid_t) -1;
230 }
231 }
232
233 if (out != STDOUT_FILE_NO)
234 {
235 if (dup2 (org_out, STDOUT_FILE_NO) < 0)
236 {
237 *err = errno;
238 *errmsg = "dup2";
239 return (pid_t) -1;
240 }
241 if (close (org_out) < 0)
242 {
243 *err = errno;
244 *errmsg = "close";
245 return (pid_t) -1;
246 }
247 }
248
249 if (errdes != STDERR_FILE_NO
250 || (flags & PEX_STDERR_TO_STDOUT) != 0)
251 {
252 if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
253 {
254 *err = errno;
255 *errmsg = "dup2";
256 return (pid_t) -1;
257 }
258 if (close (org_errdes) < 0)
259 {
260 *err = errno;
261 *errmsg = "close";
262 return (pid_t) -1;
263 }
264 }
265
266 /* Save the exit status for later. When we are called, obj->count
267 is the number of children which have executed before this
268 one. */
269 statuses = (int *) obj->sysdep;
270 statuses = XRESIZEVEC (int, statuses, obj->count + 1);
271 statuses[obj->count] = status;
272 obj->sysdep = (void *) statuses;
273
274 return (pid_t) obj->count;
275 }
276
277 /* Wait for a child process to complete. Actually the child process
278 has already completed, and we just need to return the exit
279 status. */
280
281 static pid_t
pex_djgpp_wait(struct pex_obj * obj,pid_t pid,int * status,struct pex_time * time,int done ATTRIBUTE_UNUSED,const char ** errmsg ATTRIBUTE_UNUSED,int * err ATTRIBUTE_UNUSED)282 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
283 struct pex_time *time, int done ATTRIBUTE_UNUSED,
284 const char **errmsg ATTRIBUTE_UNUSED,
285 int *err ATTRIBUTE_UNUSED)
286 {
287 int *statuses;
288
289 if (time != NULL)
290 memset (time, 0, sizeof *time);
291
292 statuses = (int *) obj->sysdep;
293 *status = statuses[pid];
294
295 return 0;
296 }
297