libiberty/pex-msdos.c

   1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
   2    with other subprocesses), and wait for it.  Generic MSDOS 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_STRING_H
  30 #include <string.h>
  31 #endif
  32 #ifdef HAVE_STDLIB_H
  33 #include <stdlib.h>
  34 #endif
  35
  36 #include "safe-ctype.h"
  37 #include <process.h>
  38
  39 /* The structure we keep in obj->sysdep.  */
  40
  41 #define PEX_MSDOS_FILE_COUNT 3
  42
  43 #define PEX_MSDOS_FD_OFFSET 10
  44
  45 struct pex_msdos
  46 {
  47   /* An array of file names.  We refer to these using file descriptors
  48      of 10 + array index.  */
  49   const char *files[PEX_MSDOS_FILE_COUNT];
  50   /* Exit statuses of programs which have been run.  */
  51   int *statuses;
  52 };
  53
  54 static int pex_msdos_open (struct pex_obj *, const char *, int);
  55 static int pex_msdos_open (struct pex_obj *, const char *, int);
  56 static int pex_msdos_fdindex (struct pex_msdos *, int);
  57 static long pex_msdos_exec_child (struct pex_obj *, int, const char *,
  58                                   char * const *, int, int, int,
  59                                   const char **, int *);
  60 static int pex_msdos_close (struct pex_obj *, int);
  61 static int pex_msdos_wait (struct pex_obj *, long, int *, struct pex_time *,
  62                            int, const char **, int *);
  63 static void pex_msdos_cleanup (struct pex_obj *);
  64
  65 /* The list of functions we pass to the common routines.  */
  66
  67 const struct pex_funcs funcs =
  68 {
  69   pex_msdos_open,
  70   pex_msdos_open,
  71   pex_msdos_exec_child,
  72   pex_msdos_close,
  73   pex_msdos_wait,
  74   NULL, /* pipe */
  75   NULL, /* fdopenr */
  76   NULL, /* fdopenw */
  77   pex_msdos_cleanup
  78 };
  79
  80 /* Return a newly initialized pex_obj structure.  */
  81
  82 struct pex_obj *
  83 pex_init (int flags, const char *pname, const char *tempbase)
  84 {
  85   struct pex_obj *ret;
  86   int i;
  87
  88   /* MSDOS does not support pipes.  */
  89   flags &= ~ PEX_USE_PIPES;
  90
  91   ret = pex_init_common (flags, pname, tempbase, funcs);
  92
  93   ret->sysdep = XNEW (struct pex_msdos);
  94   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
  95     ret->files[i] = NULL;
  96   ret->statuses = NULL;
  97
  98   return ret;
  99 }
 100
 101 /* Open a file.  FIXME: We ignore the binary argument, since we have
 102    no way to handle it.  */
 103
 104 static int
 105 pex_msdos_open (struct pex_obj *obj, const char *name,
 106                 int binary ATTRIBUTE_UNUSED)
 107 {
 108   struct pex_msdos *ms;
 109   int i;
 110
 111   ms = (struct pex_msdos *) obj->sysdep;
 112
 113   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
 114     {
 115       if (ms->files[i] == NULL)
 116         {
 117           ms->files[i] = xstrdup (name);
 118           return i + PEX_MSDOS_FD_OFFSET;
 119         }
 120     }
 121
 122   abort ();
 123 }
 124
 125 /* Get the index into msdos->files associated with an open file
 126    descriptor.  */
 127
 128 static int
 129 pex_msdos_fdindex (struct pex_msdos *ms, int fd)
 130 {
 131   fd -= PEX_MSDOS_FD_OFFSET;
 132   if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
 133     abort ();
 134   return fd;
 135 }
 136
 137
 138 /* Close a file.  */
 139
 140 static int
 141 pex_msdos_close (struct pex_obj *obj, int fd)
 142 {
 143   struct pex_msdos *ms;
 144   int fdinex;
 145
 146   ms = (struct pex_msdos *) obj->sysdep;
 147   fdindex = pe_msdos_fdindex (ms, fd);
 148   free (ms->files[fdindex]);
 149   ms->files[fdindex] = NULL;
 150 }
 151
 152 /* Execute a child.  */
 153
 154 static long
 155 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
 156                       char * const * argv, int in, int out,
 157                       int errdes ATTRIBUTE_UNUSED, const char **errmsg,
 158                       int *err)
 159 {
 160   struct pex_msdos *ms;
 161   char *temp_base;
 162   int temp_base_allocated;
 163   char *rf;
 164   int inindex;
 165   char *infile;
 166   int outindex;
 167   char *outfile;
 168   char *scmd;
 169   FILE *argfile;
 170   int i;
 171   int status;
 172
 173   ms = (struct pex_msdos *) obj->sysdep;
 174
 175   /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
 176      and PEX_STDERR_TO_STDOUT.  */
 177
 178   temp_base = obj->temp_base;
 179   if (temp_base != NULL)
 180     temp_base_allocated = 0;
 181   else
 182     {
 183       temp_base = choose_temp_base ();
 184       temp_base_allocated = 1;
 185     }
 186
 187   rf = concat (temp_base, ".gp", NULL);
 188
 189   if (temp_base_allocated)
 190     free (temp_base);
 191
 192   if (in == STDIN_FILE_NO)
 193     {
 194       inindex = -1;
 195       infile = "";
 196     }
 197   else
 198     {
 199       inindex = pex_msdos_fdindex (ms, in);
 200       infile = ms->files[inindex];
 201     }
 202
 203   if (out == STDOUT_FILE_NO)
 204     {
 205       outindex = -1;
 206       outfile = "";
 207     }
 208   else
 209     {
 210       outindex = pex_msdos_fdindex (ms, out);
 211       outfile = ms->files[outindex];
 212     }
 213
 214   scmd = XNEWVEC (char, strlen (program)
 215                   + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
 216                   + strlen (rf)
 217                   + strlen (infile)
 218                   + strlen (outfile)
 219                   + 10);
 220   sprintf (scmd, "%s%s @%s%s%s%s%s",
 221            program,
 222            (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
 223            rf,
 224            inindex != -1 ? " <" : "",
 225            infile,
 226            outindex != -1 ? " >" : "",
 227            outfile);
 228
 229   argfile = fopen (rf, "w");
 230   if (argfile == NULL)
 231     {
 232       *err = errno;
 233       free (scmd);
 234       free (rf);
 235       *errmsg = "cannot open temporary command file";
 236       return -1;
 237     }
 238
 239   for (i = 1; argv[i] != NULL; ++i)
 240     {
 241       char *p;
 242
 243       for (p = argv[i]; *p != '\0'; ++p)
 244         {
 245           if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
 246             putc ('\\', argfile);
 247           putc (*p, argfile);
 248         }
 249       putc ('\n', argfile);
 250     }
 251
 252   fclose (argfile);
 253
 254   status = system (scmd);
 255
 256   if (status == -1)
 257     {
 258       *err = errno;
 259       remove (rf);
 260       free (scmd);
 261       free (rf);
 262       *errmsg = "system";
 263       return -1;
 264     }
 265
 266   remove (rf);
 267   free (scmd);
 268   free (rf);
 269
 270   /* Save the exit status for later.  When we are called, obj->count
 271      is the number of children which have executed before this
 272      one.  */
 273   ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
 274   ms->statuses[obj->count] = status;
 275
 276   return obj->count;
 277 }
 278
 279 /* Wait for a child process to complete.  Actually the child process
 280    has already completed, and we just need to return the exit
 281    status.  */
 282
 283 static int
 284 pex_msdos_wait (struct pex_obj *obj, long pid, int *status,
 285                 struct pex_time *time, int done ATTRIBUTE_UNUSED,
 286                 const char **errmsg ATTRIBUTE_UNUSED,
 287                 int *err ATTRIBUTE_UNUSED)
 288 {
 289   struct pex_msdos *ms;
 290
 291   ms = (struct pex_msdos *) obj->sysdep;
 292
 293   if (time != NULL)
 294     memset (time, 0, sizeof *time);
 295
 296   *status = ms->statuses[pid];
 297
 298   return 0;
 299 }
 300
 301 /* Clean up the pex_msdos structure.  */
 302
 303 static void
 304 pex_msdos_cleanup (struct pex_obj  *obj)
 305 {
 306   struct pex_msdos *ms;
 307   int i;
 308
 309   ms = (struct pex_msdos *) obj->sysdep;
 310   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
 311     if (msdos->files[i] != NULL)
 312       free (msdos->files[i]);
 313   if (msdos->statuses != NULL)
 314     free (msdos->statuses);
 315   free (msdos);
 316   obj->sysdep = NULL;
 317 }