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, int);
  47 static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
  48                                   char * const *, char * const *,
  49                                   int, int, int, int,
  50                                   const char **, int *);
  51 static int pex_djgpp_close (struct pex_obj *, int);
  52 static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, 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, int append)
  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   if (append)
  98     return -1;
  99   return open (name,
 100                (O_WRONLY | O_CREAT | O_TRUNC
 101                 | (binary ? O_BINARY : O_TEXT)),
 102                S_IRUSR | S_IWUSR);
 103 }
 104
 105 /* Close a file.  */
 106
 107 static int
 108 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
 109 {
 110   return close (fd);
 111 }
 112
 113 /* Execute a child.  */
 114
 115 static pid_t
 116 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
 117                       char * const * argv, char * const * env,
 118                       int in, int out, int errdes,
 119                       int toclose ATTRIBUTE_UNUSED, const char **errmsg,
 120                       int *err)
 121 {
 122   int org_in, org_out, org_errdes;
 123   int status;
 124   int *statuses;
 125
 126   org_in = -1;
 127   org_out = -1;
 128   org_errdes = -1;
 129
 130   if (in != STDIN_FILE_NO)
 131     {
 132       org_in = dup (STDIN_FILE_NO);
 133       if (org_in < 0)
 134         {
 135           *err = errno;
 136           *errmsg = "dup";
 137           return (pid_t) -1;
 138         }
 139       if (dup2 (in, STDIN_FILE_NO) < 0)
 140         {
 141           *err = errno;
 142           *errmsg = "dup2";
 143           return (pid_t) -1;
 144         }
 145       if (close (in) < 0)
 146         {
 147           *err = errno;
 148           *errmsg = "close";
 149           return (pid_t) -1;
 150         }
 151     }
 152
 153   if (out != STDOUT_FILE_NO)
 154     {
 155       org_out = dup (STDOUT_FILE_NO);
 156       if (org_out < 0)
 157         {
 158           *err = errno;
 159           *errmsg = "dup";
 160           return (pid_t) -1;
 161         }
 162       if (dup2 (out, STDOUT_FILE_NO) < 0)
 163         {
 164           *err = errno;
 165           *errmsg = "dup2";
 166           return (pid_t) -1;
 167         }
 168       if (close (out) < 0)
 169         {
 170           *err = errno;
 171           *errmsg = "close";
 172           return (pid_t) -1;
 173         }
 174     }
 175
 176   if (errdes != STDERR_FILE_NO
 177       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 178     {
 179       org_errdes = dup (STDERR_FILE_NO);
 180       if (org_errdes < 0)
 181         {
 182           *err = errno;
 183           *errmsg = "dup";
 184           return (pid_t) -1;
 185         }
 186       if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
 187                  STDERR_FILE_NO) < 0)
 188         {
 189           *err = errno;
 190           *errmsg = "dup2";
 191           return (pid_t) -1;
 192         }
 193       if (errdes != STDERR_FILE_NO)
 194         {
 195           if (close (errdes) < 0)
 196             {
 197               *err = errno;
 198               *errmsg = "close";
 199               return (pid_t) -1;
 200             }
 201         }
 202     }
 203
 204   if (env)
 205     status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
 206               (P_WAIT, executable, argv, env));
 207   else
 208     status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
 209               (P_WAIT, executable, argv));
 210
 211   if (status == -1)
 212     {
 213       *err = errno;
 214       *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
 215     }
 216
 217   if (in != STDIN_FILE_NO)
 218     {
 219       if (dup2 (org_in, STDIN_FILE_NO) < 0)
 220         {
 221           *err = errno;
 222           *errmsg = "dup2";
 223           return (pid_t) -1;
 224         }
 225       if (close (org_in) < 0)
 226         {
 227           *err = errno;
 228           *errmsg = "close";
 229           return (pid_t) -1;
 230         }
 231     }
 232
 233   if (out != STDOUT_FILE_NO)
 234     {
 235       if (dup2 (org_out, STDOUT_FILE_NO) < 0)
 236         {
 237           *err = errno;
 238           *errmsg = "dup2";
 239           return (pid_t) -1;
 240         }
 241       if (close (org_out) < 0)
 242         {
 243           *err = errno;
 244           *errmsg = "close";
 245           return (pid_t) -1;
 246         }
 247     }
 248
 249   if (errdes != STDERR_FILE_NO
 250       || (flags & PEX_STDERR_TO_STDOUT) != 0)
 251     {
 252       if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
 253         {
 254           *err = errno;
 255           *errmsg = "dup2";
 256           return (pid_t) -1;
 257         }
 258       if (close (org_errdes) < 0)
 259         {
 260           *err = errno;
 261           *errmsg = "close";
 262           return (pid_t) -1;
 263         }
 264     }
 265
 266   /* Save the exit status for later.  When we are called, obj->count
 267      is the number of children which have executed before this
 268      one.  */
 269   statuses = (int *) obj->sysdep;
 270   statuses = XRESIZEVEC (int, statuses, obj->count + 1);
 271   statuses[obj->count] = status;
 272   obj->sysdep = (void *) statuses;
 273
 274   return (pid_t) obj->count;
 275 }
 276
 277 /* Wait for a child process to complete.  Actually the child process
 278    has already completed, and we just need to return the exit
 279    status.  */
 280
 281 static pid_t
 282 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
 283                 struct pex_time *time, int done ATTRIBUTE_UNUSED,
 284                 const char **errmsg ATTRIBUTE_UNUSED,
 285                 int *err ATTRIBUTE_UNUSED)
 286 {
 287   int *statuses;
 288
 289   if (time != NULL)
 290     memset (time, 0, sizeof *time);
 291
 292   statuses = (int *) obj->sysdep;
 293   *status = statuses[pid];
 294
 295   return 0;
 296 }