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
6This file is part of the libiberty library.
7Libiberty is free software; you can redistribute it and/or
8modify it under the terms of the GNU Library General Public
9License as published by the Free Software Foundation; either
10version 2 of the License, or (at your option) any later version.
11
12Libiberty is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15Library General Public License for more details.
16
17You should have received a copy of the GNU Library General Public
18License along with libiberty; see the file COPYING.LIB.  If not,
19write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22#include "pex-common.h"
23
24#include <stdio.h>
25#include <errno.h>
26#ifdef NEED_DECLARATION_ERRNO
27extern 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
45static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
46static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
47static 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 *);
51static int pex_djgpp_close (struct pex_obj *, int);
52static 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
57const 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
72struct pex_obj *
73pex_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
82static int
83pex_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
91static int
92pex_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
107static int
108pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
109{
110  return close (fd);
111}
112
113/* Execute a child.  */
114
115static pid_t
116pex_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
281static pid_t
282pex_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