libiberty/pex-djgpp.c

   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., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, 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 <process.h>
  33
  34 /* Use ECHILD if available, otherwise use EINVAL.  */
  35 #ifdef ECHILD
  36 #define PWAIT_ERROR ECHILD
  37 #else
  38 #define PWAIT_ERROR EINVAL
  39 #endif
  40
  41 static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
  42 static int pex_djgpp_open_write (struct pex_obj *, const char *, int);
  43 static long pex_djgpp_exec_child (struct pex_obj *, int, const char *,
  44                                   char * const *, int, int, int,
  45                                   const char **, int *);
  46 static int pex_djgpp_close (struct pex_obj *, int);
  47 static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *,
  48                            int, const char **, int *);
  49
  50 /* The list of functions we pass to the common routines.  */
  51
  52 const struct pex_funcs funcs =
  53 {
  54   pex_djgpp_open_read,
  55   pex_djgpp_open_write,
  56   pex_djgpp_exec_child,
  57   pex_djgpp_close,
  58   pex_djgpp_wait,
  59   NULL, /* pipe */
  60   NULL, /* fdopenr */
  61   NULL  /* cleanup */
  62 };
  63
  64 /* Return a newly initialized pex_obj structure.  */
  65
  66 struct pex_obj *
  67 pex_init (int flags, const char *pname, const char *tempbase)
  68 {
  69   /* DJGPP does not support pipes.  */
  70   flags &= ~ PEX_USE_PIPES;
  71   return pex_init_common (flags, pname, tempbase, funcs);
  72 }
  73
  74 /* Open a file for reading.  */
  75
  76 static int
  77 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
  78                      const char *name, int binary)
  79 {
  80   return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
  81 }
  82
  83 /* Open a file for writing.  */
  84
  85 static int
  86 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
  87                       const char *name, int binary)
  88 {
  89   /* Note that we can't use O_EXCL here because gcc may have already
  90      created the temporary file via make_temp_file.  */
  91   return open (name,
  92                (O_WRONLY | O_CREAT | O_TRUNC
  93                 | (binary ? O_BINARY : O_TEXT)),
  94                S_IRUSR | S_IWUSR);
  95 }
  96
  97 /* Close a file.  */
  98
  99 static int
 100 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
 101 {
 102   return close (fd);
 103 }
 104
 105 /* Execute a child.  */
 106
 107 static long
 108 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
 109                       char * const * argv, int in, int out, int errdes,
 110                       const char **errmsg, int *err)
 111 {
 112   int org_in, org_out, org_errdes;
 113   int status;
 114   int *statuses;
 115
 116   org_in = -1;
 117   org_out = -1;
 118   org_errdes = -1;
 119
 120   if (in != STDIN_FILE_NO)
 121     {
 122       org_in = _dup (STDIN_FILE_NO);
 123       if (org_in < 0)
 124         {
 125           *err = errno;
 126           *errmsg = "_dup";
 127           return -1;
 128         }
 129       if (_dup2 (in, STDIN_FILE_NO) < 0)
 130         {
 131           *err = errno;
 132           *errmsg = "_dup2";
 133           return -1;
 134         }
 135       if (_close (in) < 0)
 136         {
 137           *err = errno;
 138           *errmsg = "_close";
 139           return -1;
 140         }
 141     }
 142
 143   if (out != STDOUT_FILE_NO)
 144     {
 145       org_out = _dup (STDOUT_FILE_NO);
 146       if (org_out < 0)
 147         {
 148           *err = errno;
 149           *errmsg = "_dup";
 150           return -1;
 151         }
 152       if (_dup2 (out, STDOUT_FILE_NO) < 0)
 153         {
 154           *err = errno;
 155           *errmsg = "_dup2";
 156           return -1;
 157         }
 158       if (_close (out) < 0)
 159         {
 160           *err = errno;
 161           *errmsg = "_close";
 162           return -1;
 163         }
 164     }
 165
 166   if (errdes != STDERR_FILE_NO
 167       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 168     {
 169       int e;
 170
 171       org_errdes = _dup (STDERR_FILE_NO);
 172       if (org_errdes < 0)
 173         {
 174           *err = errno;
 175           *errmsg = "_dup";
 176           return -1;
 177         }
 178       if (_dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
 179                  STDERR_FILE_NO) < 0)
 180         {
 181           *err = errno;
 182           *errmsg = "_dup2";
 183           return -1;
 184         }
 185       if (errdes != STDERR_FILE_NO)
 186         {
 187           if (_close (errdes) < 0)
 188             {
 189               *err = errno;
 190               *errmsg = "_close";
 191               return -1;
 192             }
 193         }
 194     }
 195
 196   status = (((flags & PEX_SEARCH) != 0 ? _spawnvp : _spawnv)
 197             (P_WAIT, program, (const char **) argv));
 198
 199   if (status == -1)
 200     {
 201       *err = errno;
 202       *errmsg = ((flags & PEX_SEARCH) != 0) ? "_spawnvp" : "_spawnv";
 203     }
 204
 205   if (in != STDIN_FILE_NO)
 206     {
 207       if (_dup2 (org_in, STDIN_FILE_NO) < 0)
 208         {
 209           *err = errno;
 210           *errmsg = "_dup2";
 211           return -1;
 212         }
 213       if (_close (org_in) < 0)
 214         {
 215           *err = errno;
 216           *errmsg = "_close";
 217           return -1;
 218         }
 219     }
 220
 221   if (out != STDOUT_FILE_NO)
 222     {
 223       if (_dup2 (org_out, STDOUT_FILE_NO) < 0)
 224         {
 225           *err = errno;
 226           *errmsg = "_dup2";
 227           return -1;
 228         }
 229       if (_close (org_out) < 0)
 230         {
 231           *err = errno;
 232           *errmsg = "_close";
 233           return -1;
 234         }
 235     }
 236
 237   if (errdes != STDERR_FILE_NO
 238       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 239     {
 240       if (_dup2 (org_errdes, STDERR_FILE_NO) < 0)
 241         {
 242           *err = errno;
 243           *errmsg = "_dup2";
 244           return -1;
 245         }
 246       if (_close (org_errdes) < 0)
 247         {
 248           *err = errno;
 249           *errmsg = "_close";
 250           return -1;
 251         }
 252     }
 253
 254   /* Save the exit status for later.  When we are called, obj->count
 255      is the number of children which have executed before this
 256      one.  */
 257   statuses = (int *) obj->sysdep;
 258   statuses = xrealloc (statuses, (obj->count + 1) * sizeof (int));
 259   statuses[obj->count] = status;
 260   obj->sysdep = (void *) statuses;
 261
 262   return obj->count;
 263 }
 264
 265 /* Wait for a child process to complete.  Actually the child process
 266    has already completed, and we just need to return the exit
 267    status.  */
 268
 269 static int
 270 pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
 271                 struct pex_time *time, int done, const char **errmsg,
 272                 int *err)
 273 {
 274   int *statuses;
 275
 276   if (time != NULL)
 277     memset (time, 0, sizeof *time);
 278
 279   statuses = (int *) obj->sysdep;
 280   *status = statuses[pid];
 281
 282   return 0;
 283 }