Linux specific definitions for library recognition.
authordrepper <drepper>
Sun, 29 Mar 1998 21:13:20 +0000 (21:13 +0000)
committerdrepper <drepper>
Sun, 29 Mar 1998 21:13:20 +0000 (21:13 +0000)
sysdeps/unix/sysv/linux/i386/dl-librecon.h [new file with mode: 0644]

diff --git a/sysdeps/unix/sysv/linux/i386/dl-librecon.h b/sysdeps/unix/sysv/linux/i386/dl-librecon.h
new file mode 100644 (file)
index 0000000..ef2c4bb
--- /dev/null
@@ -0,0 +1,57 @@
+/* Optional code to distinguish library flavours.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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.  */
+
+#ifndef _DL_LIBRECON_H
+#define _DL_LIBRECON_H 1
+
+#define DISTINGUISH_LIB_VERSIONS \
+  do                                                                         \
+    {                                                                        \
+      /* We have to find out whether the binary is linked against            \
+        libc 5 or glibc.  We do this by looking at all the DT_NEEDED         \
+        entries.  If one is libc.so.5 this is a libc 5 linked binary.  */    \
+      if (main_map->l_info[DT_NEEDED])                                       \
+       {                                                                     \
+         /* We have dependencies.  */                                        \
+         const char *strtab = ((void *) main_map->l_addr                     \
+                               + main_map->l_info[DT_STRTAB]->d_un.d_ptr);   \
+         const ElfW(Dyn) *d;                                                 \
+                                                                             \
+         for (d = main_map->l_ld; d->d_tag != DT_NULL; ++d)                  \
+           if (d->d_tag == DT_NEEDED                                         \
+               && strcmp (strtab + d->d_un.d_val, "libc.so.5") == 0)         \
+             break;                                                          \
+                                                                             \
+         /* We print a `5' or `6' depending on the outcome.  */              \
+         _dl_sysdep_message (d->d_tag != DT_NULL ? "5\n" : "6\n", NULL);     \
+       }                                                                     \
+    }                                                                        \
+  while (0)
+
+/* Recognizing extra environment variables.  */
+#define EXTRA_LD_ENVVARS \
+  case 15:                                                                   \
+    if (memcmp (&envline[3], "LIBRARY_VERSION", 15) == 0)                    \
+      {                                                                              \
+       _dl_correct_cache_id = envline[19] == '5' ? 2 : 3;                    \
+       break;                                                                \
+      }
+
+#endif /* dl-librecon.h */