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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-11-10 09:28:00 -0200
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-11-16 15:53:58 -0200
commitafcf3cd8ebff8fed79238a2d1b95338c4606b1ee (patch)
tree0e21226d1c0fac1db0af0c829c093d59b121eb85 /include/unistd.h
parent530862a63e0929128dc98fbbd463b120934434fb (diff)
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New internal function __access_noerrno
Implement an internal version of __access called __access_noerrno that
avoids setting errno.  This is useful to check accessibility of files
very early on in process startup i.e. before TLS setup.  This allows
tunables to replace MALLOC_CHECK_ safely (i.e. check existence of
/etc/suid-debug to enable/disable MALLOC_CHECK) and at the same time
initialize very early so that it can override IFUNCs.

Checked on x86_64.

	* hurd/hurd.h (__hurd_fail_noerrno): New function.
	* include/unistd.h [IS_IN (rtld) || !defined SHARED]: Declare
	__access_noerrno.
	* io/access.c (__access_noerrno): New function.
	* sysdeps/mach/hurd/access.c (hurd_fail_seterrno): New function.
	(hurd_fail_seterrno): Likewise.
	(access_common): Likewise.
	(__access_noerrno): Likewise.
	* sysdeps/nacl/access.c (__access_noerrno): Likewise.
	* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
	* sysdeps/nacl/nacl-interfaces.h (NACL_CALL_NOERRNO): New
	macro.
Diffstat (limited to 'include/unistd.h')
-rw-r--r--include/unistd.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
index d2802b2b3e..6144f411aa 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -181,6 +181,12 @@ extern int __getlogin_r_loginuid (char *name, size_t namesize)
 #   include <dl-unistd.h>
 #  endif
 
+#  if IS_IN (rtld) || !defined SHARED
+/* __access variant that does not set errno.  Used in very early initialization
+   code in libc.a and ld.so.  */
+extern __typeof (__access) __access_noerrno attribute_hidden;
+#  endif
+
 __END_DECLS
 # endif