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