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Mark internal unistd functions hidden in ld.so

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Since internal unistd functions are only used internally in ld.so and
libc.so, they can be made hidden.  __close, __getcwd, __getpid,
__libc_read and __libc_write can't be hidden in ld.so on Hurd since they
will be preempted by the ones in libc.so after bootstrap.

	[BZ #19122]
	* include/unistd.h [IS_IN (rtld)]: Include <dl-unistd.h>.
	* sysdeps/generic/dl-unistd.h: New file.
	* sysdeps/mach/hurd/dl-unistd.h: Likewise.
This commit is contained in:
H.J. Lu 2016-01-06 12:37:04 -08:00
parent 38acf35697
commit 730bbab2c3
4 changed files with 70 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2016-01-05 H.J. Lu <hongjiu.lu@intel.com>
[BZ #19122]
* include/unistd.h [IS_IN (rtld)]: Include <dl-unistd.h>.
* sysdeps/generic/dl-unistd.h: New file.
* sysdeps/mach/hurd/dl-unistd.h: Likewise.
2016-01-05 H.J. Lu <hongjiu.lu@intel.com>
[BZ #19122]

6
include/unistd.h
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@ -158,7 +158,7 @@ rtld_hidden_proto (__libc_enable_secure)
/* Various internal function. */
extern void __libc_check_standard_fds (void);
extern void __libc_check_standard_fds (void) attribute_hidden;
/* Internal name for fork function. */
@ -176,6 +176,10 @@ extern int __have_dup3 attribute_hidden;
extern int __getlogin_r_loginuid (char *name, size_t namesize)
attribute_hidden;
# if IS_IN (rtld)
# include <dl-unistd.h>
# endif
__END_DECLS
# endif

30
sysdeps/generic/dl-unistd.h Normal file
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@ -0,0 +1,30 @@
/* Functions with hidden attribute internal to ld.so, which are declared
in include/unistd.h. Generic version.
Copyright (C) 2015 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
extern __typeof (__access) __access attribute_hidden;
extern __typeof (__brk) __brk attribute_hidden;
extern __typeof (__close) __close attribute_hidden;
extern __typeof (__getcwd) __getcwd attribute_hidden;
extern __typeof (__getpid) __getpid attribute_hidden;
extern __typeof (__libc_read) __libc_read attribute_hidden;
extern __typeof (__libc_write) __libc_write attribute_hidden;
extern __typeof (__lseek) __lseek attribute_hidden;
extern __typeof (__profil) __profil attribute_hidden;
extern __typeof (__read) __read attribute_hidden;
extern __typeof (__sbrk) __sbrk attribute_hidden;

28
sysdeps/mach/hurd/dl-unistd.h Normal file
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@ -0,0 +1,28 @@
/* Functions with hidden attribute internal to ld.so, which are declared
in include/unistd.h. Hurd version.
Copyright (C) 2015 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* __close, __getcwd, __getpid, __libc_read and __libc_write can't be
hidden in ld.so on Hurd since they will be preempted by the ones in
libc.so after bootstrap. */
extern __typeof (__access) __access attribute_hidden;
extern __typeof (__brk) __brk attribute_hidden;
extern __typeof (__lseek) __lseek attribute_hidden;
extern __typeof (__profil) __profil attribute_hidden;
extern __typeof (__read) __read attribute_hidden;
extern __typeof (__sbrk) __sbrk attribute_hidden;