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 pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
  58                                   char * const *, char * const *,
  59                                   int, int, int, int,
  60                                   int, const char **, int *);
  61 static int pex_msdos_close (struct pex_obj *, int);
  62 static int pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
  63                            int, const char **, int *);
  64 static void pex_msdos_cleanup (struct pex_obj *);
  65
  66 /* The list of functions we pass to the common routines.  */
  67
  68 const struct pex_funcs funcs =
  69 {
  70   pex_msdos_open,
  71   pex_msdos_open,
  72   pex_msdos_exec_child,
  73   pex_msdos_close,
  74   pex_msdos_wait,
  75   NULL, /* pipe */
  76   NULL, /* fdopenr */
  77   NULL, /* fdopenw */
  78   pex_msdos_cleanup
  79 };
  80
  81 /* Return a newly initialized pex_obj structure.  */
  82
  83 struct pex_obj *
  84 pex_init (int flags, const char *pname, const char *tempbase)
  85 {
  86   struct pex_obj *ret;
  87   int i;
  88
  89   /* MSDOS does not support pipes.  */
  90   flags &= ~ PEX_USE_PIPES;
  91
  92   ret = pex_init_common (flags, pname, tempbase, funcs);
  93
  94   ret->sysdep = XNEW (struct pex_msdos);
  95   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
  96     ret->files[i] = NULL;
  97   ret->statuses = NULL;
  98
  99   return ret;
 100 }
 101
 102 /* Open a file.  FIXME: We ignore the binary argument, since we have
 103    no way to handle it.  */
 104
 105 static int
 106 pex_msdos_open (struct pex_obj *obj, const char *name,
 107                 int binary ATTRIBUTE_UNUSED)
 108 {
 109   struct pex_msdos *ms;
 110   int i;
 111
 112   ms = (struct pex_msdos *) obj->sysdep;
 113
 114   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
 115     {
 116       if (ms->files[i] == NULL)
 117         {
 118           ms->files[i] = xstrdup (name);
 119           return i + PEX_MSDOS_FD_OFFSET;
 120         }
 121     }
 122
 123   abort ();
 124 }
 125
 126 /* Get the index into msdos->files associated with an open file
 127    descriptor.  */
 128
 129 static int
 130 pex_msdos_fdindex (struct pex_msdos *ms, int fd)
 131 {
 132   fd -= PEX_MSDOS_FD_OFFSET;
 133   if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
 134     abort ();
 135   return fd;
 136 }
 137
 138
 139 /* Close a file.  */
 140
 141 static int
 142 pex_msdos_close (struct pex_obj *obj, int fd)
 143 {
 144   struct pex_msdos *ms;
 145   int fdinex;
 146
 147   ms = (struct pex_msdos *) obj->sysdep;
 148   fdindex = pe_msdos_fdindex (ms, fd);
 149   free (ms->files[fdindex]);
 150   ms->files[fdindex] = NULL;
 151 }
 152
 153 /* Execute a child.  */
 154
 155 static pid_t
 156 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
 157                       char * const * argv, char * const * env, int in, int out,
 158                       int toclose ATTRIBUTE_UNUSED,
 159                       int errdes ATTRIBUTE_UNUSED, const char **errmsg,
 160                       int *err)
 161 {
 162   struct pex_msdos *ms;
 163   char *temp_base;
 164   int temp_base_allocated;
 165   char *rf;
 166   int inindex;
 167   char *infile;
 168   int outindex;
 169   char *outfile;
 170   char *scmd;
 171   FILE *argfile;
 172   int i;
 173   int status;
 174
 175   ms = (struct pex_msdos *) obj->sysdep;
 176
 177   /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
 178      and PEX_STDERR_TO_STDOUT.  */
 179
 180   temp_base = obj->temp_base;
 181   if (temp_base != NULL)
 182     temp_base_allocated = 0;
 183   else
 184     {
 185       temp_base = choose_temp_base ();
 186       temp_base_allocated = 1;
 187     }
 188
 189   rf = concat (temp_base, ".gp", NULL);
 190
 191   if (temp_base_allocated)
 192     free (temp_base);
 193
 194   if (in == STDIN_FILE_NO)
 195     {
 196       inindex = -1;
 197       infile = "";
 198     }
 199   else
 200     {
 201       inindex = pex_msdos_fdindex (ms, in);
 202       infile = ms->files[inindex];
 203     }
 204
 205   if (out == STDOUT_FILE_NO)
 206     {
 207       outindex = -1;
 208       outfile = "";
 209     }
 210   else
 211     {
 212       outindex = pex_msdos_fdindex (ms, out);
 213       outfile = ms->files[outindex];
 214     }
 215
 216   scmd = XNEWVEC (char, strlen (program)
 217                   + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
 218                   + strlen (rf)
 219                   + strlen (infile)
 220                   + strlen (outfile)
 221                   + 10);
 222   sprintf (scmd, "%s%s @%s%s%s%s%s",
 223            program,
 224            (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
 225            rf,
 226            inindex != -1 ? " <" : "",
 227            infile,
 228            outindex != -1 ? " >" : "",
 229            outfile);
 230
 231   argfile = fopen (rf, "w");
 232   if (argfile == NULL)
 233     {
 234       *err = errno;
 235       free (scmd);
 236       free (rf);
 237       *errmsg = "cannot open temporary command file";
 238       return (pid_t) -1;
 239     }
 240
 241   for (i = 1; argv[i] != NULL; ++i)
 242     {
 243       char *p;
 244
 245       for (p = argv[i]; *p != '\0'; ++p)
 246         {
 247           if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
 248             putc ('\\', argfile);
 249           putc (*p, argfile);
 250         }
 251       putc ('\n', argfile);
 252     }
 253
 254   fclose (argfile);
 255
 256   status = system (scmd);
 257
 258   if (status == -1)
 259     {
 260       *err = errno;
 261       remove (rf);
 262       free (scmd);
 263       free (rf);
 264       *errmsg = "system";
 265       return (pid_t) -1;
 266     }
 267
 268   remove (rf);
 269   free (scmd);
 270   free (rf);
 271
 272   /* Save the exit status for later.  When we are called, obj->count
 273      is the number of children which have executed before this
 274      one.  */
 275   ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
 276   ms->statuses[obj->count] = status;
 277
 278   return (pid_t) obj->count;
 279 }
 280
 281 /* Wait for a child process to complete.  Actually the child process
 282    has already completed, and we just need to return the exit
 283    status.  */
 284
 285 static int
 286 pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status,
 287                 struct pex_time *time, int done ATTRIBUTE_UNUSED,
 288                 const char **errmsg ATTRIBUTE_UNUSED,
 289                 int *err ATTRIBUTE_UNUSED)
 290 {
 291   struct pex_msdos *ms;
 292
 293   ms = (struct pex_msdos *) obj->sysdep;
 294
 295   if (time != NULL)
 296     memset (time, 0, sizeof *time);
 297
 298   *status = ms->statuses[pid];
 299
 300   return 0;
 301 }
 302
 303 /* Clean up the pex_msdos structure.  */
 304
 305 static void
 306 pex_msdos_cleanup (struct pex_obj  *obj)
 307 {
 308   struct pex_msdos *ms;
 309   int i;
 310
 311   ms = (struct pex_msdos *) obj->sysdep;
 312   for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
 313     if (msdos->files[i] != NULL)
 314       free (msdos->files[i]);
 315   if (msdos->statuses != NULL)
 316     free (msdos->statuses);
 317   free (msdos);
 318   obj->sysdep = NULL;
 319 }