elf/dl-misc.c

   1 /* Miscellaneous support functions for dynamic linker
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <assert.h>
  21 #include <fcntl.h>
  22 #include <unistd.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include <sys/mman.h>
  26 #include <sys/stat.h>
  27
  28 #ifndef MAP_ANON
  29 /* This is the only dl-sysdep.c function that is actually needed at run-time
  30    by _dl_map_object.  */
  31
  32 int
  33 _dl_sysdep_open_zero_fill (void)
  34 {
  35   return __open ("/dev/zero", O_RDONLY);
  36 }
  37 #endif
  38
  39 /* Read the whole contents of FILE into new mmap'd space with given
  40    protections.  *SIZEP gets the size of the file.  */
  41
  42 void *
  43 _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
  44 {
  45   void *result;
  46   struct stat st;
  47   int fd = __open (file, O_RDONLY);
  48   if (fd < 0)
  49     return NULL;
  50   if (__fxstat (_STAT_VER, fd, &st) < 0)
  51     result = NULL;
  52   else
  53     {
  54       /* Map a copy of the file contents.  */
  55       result = __mmap (0, st.st_size, prot,
  56 #ifdef MAP_COPY
  57                        MAP_COPY
  58 #else
  59                        MAP_PRIVATE
  60 #endif
  61 #ifdef MAP_FILE
  62                        | MAP_FILE
  63 #endif
  64                        , fd, 0);
  65       if (result == MAP_FAILED)
  66         result = NULL;
  67       else
  68         *sizep = st.st_size;
  69     }
  70   __close (fd);
  71   return result;
  72 }
  73
  74
  75 void
  76 _dl_sysdep_fatal (const char *msg, ...)
  77 {
  78   va_list ap;
  79
  80   va_start (ap, msg);
  81   do
  82     {
  83       size_t len = strlen (msg);
  84       __write (STDERR_FILENO, msg, len);
  85       msg = va_arg (ap, const char *);
  86     } while (msg);
  87   va_end (ap);
  88
  89   _exit (127);
  90 }
  91
  92
  93 void
  94 _dl_sysdep_error (const char *msg, ...)
  95 {
  96   va_list ap;
  97
  98   va_start (ap, msg);
  99   do
 100     {
 101       size_t len = strlen (msg);
 102       __write (STDERR_FILENO, msg, len);
 103       msg = va_arg (ap, const char *);
 104     } while (msg);
 105   va_end (ap);
 106 }
 107
 108
 109 void
 110 _dl_sysdep_message (const char *msg, ...)
 111 {
 112   va_list ap;
 113
 114   va_start (ap, msg);
 115   do
 116     {
 117       size_t len = strlen (msg);
 118       __write (STDOUT_FILENO, msg, len);
 119       msg = va_arg (ap, const char *);
 120     } while (msg);
 121   va_end (ap);
 122 }