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