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);
47 static long pex_djgpp_exec_child (struct pex_obj *, int, const char *,
48 char * const *, int, int, int,
49 const char **, int *);
50 static int pex_djgpp_close (struct pex_obj *, int);
51 static int pex_djgpp_wait (struct pex_obj *, long, 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 /* cleanup */
66 };
67
68 /* Return a newly initialized pex_obj structure. */
69
70 struct pex_obj *
pex_init(int flags,const char * pname,const char * tempbase)71 pex_init (int flags, const char *pname, const char *tempbase)
72 {
73 /* DJGPP does not support pipes. */
74 flags &= ~ PEX_USE_PIPES;
75 return pex_init_common (flags, pname, tempbase, &funcs);
76 }
77
78 /* Open a file for reading. */
79
80 static int
pex_djgpp_open_read(struct pex_obj * obj ATTRIBUTE_UNUSED,const char * name,int binary)81 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
82 const char *name, int binary)
83 {
84 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
85 }
86
87 /* Open a file for writing. */
88
89 static int
pex_djgpp_open_write(struct pex_obj * obj ATTRIBUTE_UNUSED,const char * name,int binary)90 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
91 const char *name, int binary)
92 {
93 /* Note that we can't use O_EXCL here because gcc may have already
94 created the temporary file via make_temp_file. */
95 return open (name,
96 (O_WRONLY | O_CREAT | O_TRUNC
97 | (binary ? O_BINARY : O_TEXT)),
98 S_IRUSR | S_IWUSR);
99 }
100
101 /* Close a file. */
102
103 static int
pex_djgpp_close(struct pex_obj * obj ATTRIBUTE_UNUSED,int fd)104 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
105 {
106 return close (fd);
107 }
108
109 /* Execute a child. */
110
111 static long
pex_djgpp_exec_child(struct pex_obj * obj,int flags,const char * executable,char * const * argv,int in,int out,int errdes,const char ** errmsg,int * err)112 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
113 char * const * argv, int in, int out, int errdes,
114 const char **errmsg, int *err)
115 {
116 int org_in, org_out, org_errdes;
117 int status;
118 int *statuses;
119
120 org_in = -1;
121 org_out = -1;
122 org_errdes = -1;
123
124 if (in != STDIN_FILE_NO)
125 {
126 org_in = dup (STDIN_FILE_NO);
127 if (org_in < 0)
128 {
129 *err = errno;
130 *errmsg = "dup";
131 return -1;
132 }
133 if (dup2 (in, STDIN_FILE_NO) < 0)
134 {
135 *err = errno;
136 *errmsg = "dup2";
137 return -1;
138 }
139 if (close (in) < 0)
140 {
141 *err = errno;
142 *errmsg = "close";
143 return -1;
144 }
145 }
146
147 if (out != STDOUT_FILE_NO)
148 {
149 org_out = dup (STDOUT_FILE_NO);
150 if (org_out < 0)
151 {
152 *err = errno;
153 *errmsg = "dup";
154 return -1;
155 }
156 if (dup2 (out, STDOUT_FILE_NO) < 0)
157 {
158 *err = errno;
159 *errmsg = "dup2";
160 return -1;
161 }
162 if (close (out) < 0)
163 {
164 *err = errno;
165 *errmsg = "close";
166 return -1;
167 }
168 }
169
170 if (errdes != STDERR_FILE_NO
171 || (flags & PEX_STDERR_TO_STDOUT) != 0)
172 {
173 org_errdes = dup (STDERR_FILE_NO);
174 if (org_errdes < 0)
175 {
176 *err = errno;
177 *errmsg = "dup";
178 return -1;
179 }
180 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
181 STDERR_FILE_NO) < 0)
182 {
183 *err = errno;
184 *errmsg = "dup2";
185 return -1;
186 }
187 if (errdes != STDERR_FILE_NO)
188 {
189 if (close (errdes) < 0)
190 {
191 *err = errno;
192 *errmsg = "close";
193 return -1;
194 }
195 }
196 }
197
198 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
199 (P_WAIT, executable, (char * const *) argv));
200
201 if (status == -1)
202 {
203 *err = errno;
204 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
205 }
206
207 if (in != STDIN_FILE_NO)
208 {
209 if (dup2 (org_in, STDIN_FILE_NO) < 0)
210 {
211 *err = errno;
212 *errmsg = "dup2";
213 return -1;
214 }
215 if (close (org_in) < 0)
216 {
217 *err = errno;
218 *errmsg = "close";
219 return -1;
220 }
221 }
222
223 if (out != STDOUT_FILE_NO)
224 {
225 if (dup2 (org_out, STDOUT_FILE_NO) < 0)
226 {
227 *err = errno;
228 *errmsg = "dup2";
229 return -1;
230 }
231 if (close (org_out) < 0)
232 {
233 *err = errno;
234 *errmsg = "close";
235 return -1;
236 }
237 }
238
239 if (errdes != STDERR_FILE_NO
240 || (flags & PEX_STDERR_TO_STDOUT) != 0)
241 {
242 if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
243 {
244 *err = errno;
245 *errmsg = "dup2";
246 return -1;
247 }
248 if (close (org_errdes) < 0)
249 {
250 *err = errno;
251 *errmsg = "close";
252 return -1;
253 }
254 }
255
256 /* Save the exit status for later. When we are called, obj->count
257 is the number of children which have executed before this
258 one. */
259 statuses = (int *) obj->sysdep;
260 statuses = XRESIZEVEC (int, statuses, obj->count + 1);
261 statuses[obj->count] = status;
262 obj->sysdep = (void *) statuses;
263
264 return obj->count;
265 }
266
267 /* Wait for a child process to complete. Actually the child process
268 has already completed, and we just need to return the exit
269 status. */
270
271 static int
pex_djgpp_wait(struct pex_obj * obj,long pid,int * status,struct pex_time * time,int done ATTRIBUTE_UNUSED,const char ** errmsg ATTRIBUTE_UNUSED,int * err ATTRIBUTE_UNUSED)272 pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
273 struct pex_time *time, int done ATTRIBUTE_UNUSED,
274 const char **errmsg ATTRIBUTE_UNUSED,
275 int *err ATTRIBUTE_UNUSED)
276 {
277 int *statuses;
278
279 if (time != NULL)
280 memset (time, 0, sizeof *time);
281
282 statuses = (int *) obj->sysdep;
283 *status = statuses[pid];
284
285 return 0;
286 }
287