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 *, char * const *,
  49                                   int, int, int,
  50                                   const char **, int *);
  51 static int pex_djgpp_close (struct pex_obj *, int);
  52 static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *,
  53                            int, const char **, int *);
  54
  55 /* The list of functions we pass to the common routines.  */
  56
  57 const 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
  72 struct pex_obj *
  73 pex_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
  82 static int
  83 pex_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
  91 static int
  92 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
  93                       const char *name, int binary)
  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   return open (name,
  98                (O_WRONLY | O_CREAT | O_TRUNC
  99                 | (binary ? O_BINARY : O_TEXT)),
 100                S_IRUSR | S_IWUSR);
 101 }
 102
 103 /* Close a file.  */
 104
 105 static int
 106 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
 107 {
 108   return close (fd);
 109 }
 110
 111 /* Execute a child.  */
 112
 113 static long
 114 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
 115                       char * const * argv, char * const * env,
 116                       int in, int out, int errdes,
 117                       const char **errmsg, int *err)
 118 {
 119   int org_in, org_out, org_errdes;
 120   int status;
 121   int *statuses;
 122
 123   org_in = -1;
 124   org_out = -1;
 125   org_errdes = -1;
 126
 127   if (in != STDIN_FILE_NO)
 128     {
 129       org_in = dup (STDIN_FILE_NO);
 130       if (org_in < 0)
 131         {
 132           *err = errno;
 133           *errmsg = "dup";
 134           return -1;
 135         }
 136       if (dup2 (in, STDIN_FILE_NO) < 0)
 137         {
 138           *err = errno;
 139           *errmsg = "dup2";
 140           return -1;
 141         }
 142       if (close (in) < 0)
 143         {
 144           *err = errno;
 145           *errmsg = "close";
 146           return -1;
 147         }
 148     }
 149
 150   if (out != STDOUT_FILE_NO)
 151     {
 152       org_out = dup (STDOUT_FILE_NO);
 153       if (org_out < 0)
 154         {
 155           *err = errno;
 156           *errmsg = "dup";
 157           return -1;
 158         }
 159       if (dup2 (out, STDOUT_FILE_NO) < 0)
 160         {
 161           *err = errno;
 162           *errmsg = "dup2";
 163           return -1;
 164         }
 165       if (close (out) < 0)
 166         {
 167           *err = errno;
 168           *errmsg = "close";
 169           return -1;
 170         }
 171     }
 172
 173   if (errdes != STDERR_FILE_NO
 174       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 175     {
 176       org_errdes = dup (STDERR_FILE_NO);
 177       if (org_errdes < 0)
 178         {
 179           *err = errno;
 180           *errmsg = "dup";
 181           return -1;
 182         }
 183       if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
 184                  STDERR_FILE_NO) < 0)
 185         {
 186           *err = errno;
 187           *errmsg = "dup2";
 188           return -1;
 189         }
 190       if (errdes != STDERR_FILE_NO)
 191         {
 192           if (close (errdes) < 0)
 193             {
 194               *err = errno;
 195               *errmsg = "close";
 196               return -1;
 197             }
 198         }
 199     }
 200
 201   if (env)
 202     status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
 203               (P_WAIT, executable, argv, env));
 204   else
 205     status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
 206               (P_WAIT, executable, argv));
 207
 208   if (status == -1)
 209     {
 210       *err = errno;
 211       *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
 212     }
 213
 214   if (in != STDIN_FILE_NO)
 215     {
 216       if (dup2 (org_in, STDIN_FILE_NO) < 0)
 217         {
 218           *err = errno;
 219           *errmsg = "dup2";
 220           return -1;
 221         }
 222       if (close (org_in) < 0)
 223         {
 224           *err = errno;
 225           *errmsg = "close";
 226           return -1;
 227         }
 228     }
 229
 230   if (out != STDOUT_FILE_NO)
 231     {
 232       if (dup2 (org_out, STDOUT_FILE_NO) < 0)
 233         {
 234           *err = errno;
 235           *errmsg = "dup2";
 236           return -1;
 237         }
 238       if (close (org_out) < 0)
 239         {
 240           *err = errno;
 241           *errmsg = "close";
 242           return -1;
 243         }
 244     }
 245
 246   if (errdes != STDERR_FILE_NO
 247       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 248     {
 249       if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
 250         {
 251           *err = errno;
 252           *errmsg = "dup2";
 253           return -1;
 254         }
 255       if (close (org_errdes) < 0)
 256         {
 257           *err = errno;
 258           *errmsg = "close";
 259           return -1;
 260         }
 261     }
 262
 263   /* Save the exit status for later.  When we are called, obj->count
 264      is the number of children which have executed before this
 265      one.  */
 266   statuses = (int *) obj->sysdep;
 267   statuses = XRESIZEVEC (int, statuses, obj->count + 1);
 268   statuses[obj->count] = status;
 269   obj->sysdep = (void *) statuses;
 270
 271   return obj->count;
 272 }
 273
 274 /* Wait for a child process to complete.  Actually the child process
 275    has already completed, and we just need to return the exit
 276    status.  */
 277
 278 static int
 279 pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
 280                 struct pex_time *time, int done ATTRIBUTE_UNUSED,
 281                 const char **errmsg ATTRIBUTE_UNUSED,
 282                 int *err ATTRIBUTE_UNUSED)
 283 {
 284   int *statuses;
 285
 286   if (time != NULL)
 287     memset (time, 0, sizeof *time);
 288
 289   statuses = (int *) obj->sysdep;
 290   *status = statuses[pid];
 291
 292   return 0;
 293 }