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