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., 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 *
  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
  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
  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
 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
 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 = xrealloc (statuses, (obj->count + 1) * sizeof (int));
 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
 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 }