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authorUlrich Drepper <drepper@redhat.com>2008-07-24 18:33:44 +0000
committerUlrich Drepper <drepper@redhat.com>2008-07-24 18:33:44 +0000
commit0e077a7eea286a8efd63460d0ea5d99e44a86b71 (patch)
tree38d71e27469168c43fd230adeb20b206eb156b39 /sysdeps
parent579cdf5a473e1e14e67539103b4cb525f8b7cf6e (diff)
* elf/elf.h: Define AT_EXECFN.
* elf/rtld.c [!__ASSUME_AT_EXECFN] (process_envvars): Don't handle LD_ORIGIN_PATH. * elf/dl-sysdep.c (_dl_sysdep_start): Handle AT_EXECFN. * elf/dl-support.c: Define _dl_execfn. Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined. (_dl_aux_init): Handle AT_EXECFN. * sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_EXECFN for 2.6.27 and up. * sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_execfn. Don't define _dl_origin_path if __ASSUME_AT_EXECFN is defined. * sysdeps/unix/sysv/linux/dl-origin.c (_dl_get_origin): Use _dl_execfn if available and avoid compatibility code if __ASSUME_AT_EXECFN is defined.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/ldsodefs.h6
-rw-r--r--sysdeps/unix/sysv/linux/dl-origin.c53
-rw-r--r--sysdeps/unix/sysv/linux/kernel-features.h7
3 files changed, 47 insertions, 19 deletions
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 9d1ebdf615..27c8fb620d 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -38,6 +38,7 @@
#include <bits/libc-lock.h>
#include <hp-timing.h>
#include <tls.h>
+#include <kernel-features.h>
__BEGIN_DECLS
@@ -592,8 +593,13 @@ struct rtld_global_ro
/* Names of shared object for which the RPATH should be ignored. */
EXTERN const char *_dl_inhibit_rpath;
+#ifndef __ASSUME_AT_EXECFN
/* Location of the binary. */
EXTERN const char *_dl_origin_path;
+#endif
+
+ /* If set, points to the file name of the executable. */
+ EXTERN const char *_dl_execfn;
/* -1 if the dynamic linker should honor library load bias,
0 if not, -2 use the default (honor biases for normal
diff --git a/sysdeps/unix/sysv/linux/dl-origin.c b/sysdeps/unix/sysv/linux/dl-origin.c
index a7fa53ea1d..5dacec60d9 100644
--- a/sysdeps/unix/sysv/linux/dl-origin.c
+++ b/sysdeps/unix/sysv/linux/dl-origin.c
@@ -1,5 +1,5 @@
/* Find path of executable.
- Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
+ Copyright (C) 1998-2000, 2002, 2004, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
@@ -35,30 +35,32 @@
const char *
_dl_get_origin (void)
{
+#ifndef __ASSUME_AT_EXECFN
char linkval[PATH_MAX];
- char *result;
+#endif
+ char *str;
+ char *result = (char *) -1l;
int len;
- INTERNAL_SYSCALL_DECL (err);
- len = INTERNAL_SYSCALL (readlink, err, 3, "/proc/self/exe", linkval,
- sizeof (linkval));
- if (! INTERNAL_SYSCALL_ERROR_P (len, err) && len > 0 && linkval[0] != '[')
+ str = GLRO(dl_execfn);
+#ifndef __ASSUME_AT_EXECFN
+ if (str == NULL)
{
- /* We can use this value. */
- assert (linkval[0] == '/');
- while (len > 1 && linkval[len - 1] != '/')
- --len;
- result = (char *) malloc (len + 1);
- if (result == NULL)
- result = (char *) -1;
- else if (len == 1)
- memcpy (result, "/", 2);
- else
- *((char *) __mempcpy (result, linkval, len - 1)) = '\0';
+ INTERNAL_SYSCALL_DECL (err);
+
+ len = INTERNAL_SYSCALL (readlink, err, 3, "/proc/self/exe", linkval,
+ sizeof (linkval));
+ if (! INTERNAL_SYSCALL_ERROR_P (len, err)
+ && len > 0 && linkval[0] != '[')
+ str = linkval;
}
else
+#endif
+ len = strlen (str);
+
+#ifndef __ASSUME_AT_EXECFN
+ if (str == NULL)
{
- result = (char *) -1;
/* We use the environment variable LD_ORIGIN_PATH. If it is set make
a copy and strip out trailing slashes. */
if (GLRO(dl_origin_path) != NULL)
@@ -76,6 +78,21 @@ _dl_get_origin (void)
}
}
}
+ else
+#endif
+ {
+ /* We can use this value. */
+ assert (str[0] == '/');
+ while (len > 1 && str[len - 1] != '/')
+ --len;
+ result = (char *) malloc (len + 1);
+ if (result == NULL)
+ result = (char *) -1;
+ else if (len == 1)
+ memcpy (result, "/", 2);
+ else
+ *((char *) __mempcpy (result, str, len - 1)) = '\0';
+ }
return result;
}
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 01baab0903..5b41429f16 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -1,6 +1,6 @@
/* Set flags signalling availability of kernel features based on given
kernel version number.
- Copyright (C) 1999-2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1999-2006, 2007, 2008 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
@@ -492,3 +492,8 @@
#if __LINUX_KERNEL_VERSION >= 0x020618
# define __ASSUME_ADJ_OFFSET_SS_READ 1
#endif
+
+/* Support for AT_EXECFN was added in 2.6.27. */
+#if __LINUX_KERNEL_VERSION >= 0x02061b
+# define __ASSUME_AT_EXECFN 1
+#endif