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, /* fdopenw */
  66   NULL  /* cleanup */
  67 };
  68
  69 /* Return a newly initialized pex_obj structure.  */
  70
  71 struct pex_obj *
  72 pex_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
  81 static int
  82 pex_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
  90 static int
  91 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
  92                       const char *name, int binary)
  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   return open (name,
  97                (O_WRONLY | O_CREAT | O_TRUNC
  98                 | (binary ? O_BINARY : O_TEXT)),
  99                S_IRUSR | S_IWUSR);
 100 }
 101
 102 /* Close a file.  */
 103
 104 static int
 105 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
 106 {
 107   return close (fd);
 108 }
 109
 110 /* Execute a child.  */
 111
 112 static long
 113 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
 114                       char * const * argv, int in, int out, int errdes,
 115                       const char **errmsg, int *err)
 116 {
 117   int org_in, org_out, org_errdes;
 118   int status;
 119   int *statuses;
 120
 121   org_in = -1;
 122   org_out = -1;
 123   org_errdes = -1;
 124
 125   if (in != STDIN_FILE_NO)
 126     {
 127       org_in = dup (STDIN_FILE_NO);
 128       if (org_in < 0)
 129         {
 130           *err = errno;
 131           *errmsg = "dup";
 132           return -1;
 133         }
 134       if (dup2 (in, STDIN_FILE_NO) < 0)
 135         {
 136           *err = errno;
 137           *errmsg = "dup2";
 138           return -1;
 139         }
 140       if (close (in) < 0)
 141         {
 142           *err = errno;
 143           *errmsg = "close";
 144           return -1;
 145         }
 146     }
 147
 148   if (out != STDOUT_FILE_NO)
 149     {
 150       org_out = dup (STDOUT_FILE_NO);
 151       if (org_out < 0)
 152         {
 153           *err = errno;
 154           *errmsg = "dup";
 155           return -1;
 156         }
 157       if (dup2 (out, STDOUT_FILE_NO) < 0)
 158         {
 159           *err = errno;
 160           *errmsg = "dup2";
 161           return -1;
 162         }
 163       if (close (out) < 0)
 164         {
 165           *err = errno;
 166           *errmsg = "close";
 167           return -1;
 168         }
 169     }
 170
 171   if (errdes != STDERR_FILE_NO
 172       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 173     {
 174       org_errdes = dup (STDERR_FILE_NO);
 175       if (org_errdes < 0)
 176         {
 177           *err = errno;
 178           *errmsg = "dup";
 179           return -1;
 180         }
 181       if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
 182                  STDERR_FILE_NO) < 0)
 183         {
 184           *err = errno;
 185           *errmsg = "dup2";
 186           return -1;
 187         }
 188       if (errdes != STDERR_FILE_NO)
 189         {
 190           if (close (errdes) < 0)
 191             {
 192               *err = errno;
 193               *errmsg = "close";
 194               return -1;
 195             }
 196         }
 197     }
 198
 199   status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
 200             (P_WAIT, executable, (char * const *) argv));
 201
 202   if (status == -1)
 203     {
 204       *err = errno;
 205       *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
 206     }
 207
 208   if (in != STDIN_FILE_NO)
 209     {
 210       if (dup2 (org_in, STDIN_FILE_NO) < 0)
 211         {
 212           *err = errno;
 213           *errmsg = "dup2";
 214           return -1;
 215         }
 216       if (close (org_in) < 0)
 217         {
 218           *err = errno;
 219           *errmsg = "close";
 220           return -1;
 221         }
 222     }
 223
 224   if (out != STDOUT_FILE_NO)
 225     {
 226       if (dup2 (org_out, STDOUT_FILE_NO) < 0)
 227         {
 228           *err = errno;
 229           *errmsg = "dup2";
 230           return -1;
 231         }
 232       if (close (org_out) < 0)
 233         {
 234           *err = errno;
 235           *errmsg = "close";
 236           return -1;
 237         }
 238     }
 239
 240   if (errdes != STDERR_FILE_NO
 241       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 242     {
 243       if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
 244         {
 245           *err = errno;
 246           *errmsg = "dup2";
 247           return -1;
 248         }
 249       if (close (org_errdes) < 0)
 250         {
 251           *err = errno;
 252           *errmsg = "close";
 253           return -1;
 254         }
 255     }
 256
 257   /* Save the exit status for later.  When we are called, obj->count
 258      is the number of children which have executed before this
 259      one.  */
 260   statuses = (int *) obj->sysdep;
 261   statuses = XRESIZEVEC (int, statuses, obj->count + 1);
 262   statuses[obj->count] = status;
 263   obj->sysdep = (void *) statuses;
 264
 265   return obj->count;
 266 }
 267
 268 /* Wait for a child process to complete.  Actually the child process
 269    has already completed, and we just need to return the exit
 270    status.  */
 271
 272 static int
 273 pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
 274                 struct pex_time *time, int done ATTRIBUTE_UNUSED,
 275                 const char **errmsg ATTRIBUTE_UNUSED,
 276                 int *err ATTRIBUTE_UNUSED)
 277 {
 278   int *statuses;
 279
 280   if (time != NULL)
 281     memset (time, 0, sizeof *time);
 282
 283   statuses = (int *) obj->sysdep;
 284   *status = statuses[pid];
 285
 286   return 0;
 287 }