86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* Support for dynamic linking code in static libc.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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/* This file defines some things that for the dynamic linker are defined in
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rtld.c and dl-sysdep.c in ways appropriate to bootstrap dynamic linking. */
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extern char *__progname;
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char **_dl_argv = &__progname; /* This is checked for some error messages. */
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/* This defines the default search path for libraries.
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For the dynamic linker it is set by -rpath when linking. */
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const char *_dl_rpath = DEFAULT_RPATH;
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/* This is the only dl-sysdep.c function that is actually needed at run-time
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by _dl_map_object. */
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int
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_dl_sysdep_open_zero_fill (void)
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{
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return __open ("/dev/zero", O_RDONLY);
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}
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/* This should never be called. */
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void
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_dl_sysdep_fatal (void)
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{
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assert (! "_dl_sysdep_fatal called");
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}
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/* Read the whole contents of FILE into new mmap'd space with given
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protections. *SIZEP gets the size of the file. */
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void *
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_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
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{
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void *result;
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struct stat st;
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int fd = __open (file, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (__fstat (fd, &st) < 0)
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result = NULL;
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else
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{
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/* Map a copy of the file contents. */
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result = __mmap (0, st.st_size, prot,
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#ifdef MAP_COPY
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MAP_COPY
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#else
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MAP_PRIVATE
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#endif
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#ifdef MAP_FILE
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| MAP_FILE
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#endif
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, fd, 0);
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if (result == (void *) -1)
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result = NULL;
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else
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*sizep = st.st_size;
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}
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__close (fd);
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return result;
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}
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