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) 1996-2022 Free Software Foundation, Inc.
4
5This file is part of the libiberty library.
6Libiberty is free software; you can redistribute it and/or
7modify it under the terms of the GNU Library General Public
8License as published by the Free Software Foundation; either
9version 2 of the License, or (at your option) any later version.
10
11Libiberty is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14Library General Public License for more details.
15
16You should have received a copy of the GNU Library General Public
17License along with libiberty; see the file COPYING.LIB.  If not,
18write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
19Boston, MA 02110-1301, USA.  */
20
21#include "pex-common.h"
22
23#include <stdio.h>
24#include <errno.h>
25#ifdef NEED_DECLARATION_ERRNO
26extern 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
44static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
45static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
46static 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 *);
50static int pex_djgpp_close (struct pex_obj *, int);
51static 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
56const 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
71struct pex_obj *
72pex_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
81static int
82pex_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
90static int
91pex_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
106static int
107pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
108{
109  return close (fd);
110}
111
112/* Execute a child.  */
113
114static pid_t
115pex_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
280static pid_t
281pex_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}
296