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jeremybenn |
/* Optional code to distinguish library flavours.
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Copyright (C) 1998, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _DL_LIBRECON_H
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#define _DL_LIBRECON_H 1
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#define DISTINGUISH_LIB_VERSIONS \
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do \
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{ \
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/* We have to find out whether the binary is linked against \
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libc 5 or glibc. We do this by looking at all the DT_NEEDED \
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entries. If one is libc.so.5 this is a libc 5 linked binary. */ \
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if (_dl_loaded->l_info[DT_NEEDED]) \
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{ \
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/* We have dependencies. */ \
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const ElfW(Dyn) *d; \
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const char *strtab; \
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\
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strtab = (const char *) D_PTR (_dl_loaded, l_info[DT_STRTAB]); \
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\
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for (d = _dl_loaded->l_ld; d->d_tag != DT_NULL; ++d) \
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if (d->d_tag == DT_NEEDED \
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&& strcmp (strtab + d->d_un.d_val, "libc.so.5") == 0) \
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break; \
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\
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/* We print a `5' or `6' depending on the outcome. */ \
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_dl_printf (d->d_tag != DT_NULL ? "5\n" : "6\n"); \
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} \
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} \
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while (0)
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/* Recognizing extra environment variables. */
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#define EXTRA_LD_ENVVARS \
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case 13: \
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if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \
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{ \
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unsigned long int i, j, osversion = 0; \
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char *p = &envline[14], *q; \
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\
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for (i = 0; i < 3; i++, p = q + 1) \
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{ \
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j = __strtoul_internal (p, &q, 0, 0); \
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if (j >= 255 || p == q || (i < 2 && *q && *q != '.')) \
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{ \
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osversion = 0; \
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break; \
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} \
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osversion |= j << (16 - 8 * i); \
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if (!*q) \
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break; \
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} \
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if (osversion) \
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_dl_osversion = osversion; \
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break; \
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} \
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\
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case 15: \
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if (memcmp (envline, "LIBRARY_VERSION", 15) == 0) \
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{ \
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_dl_correct_cache_id = envline[16] == '5' ? 2 : 3; \
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break; \
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}
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/* Extra unsecure variables. The names are all stuffed in a single
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string which means they have to be terminated with a '\0' explicitly. */
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#define EXTRA_UNSECURE_ENVVARS \
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"LD_AOUT_LIBRARY_PATH\0" \
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"LD_AOUT_PRELOAD\0"
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#endif /* dl-librecon.h */
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