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Linux: Introduce <bits/mman-shared.h>

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This header file enables sharing of portable declarations and
definitions across all Linux architectures, including hppa (which does
not use <bits/mman-linux.h>).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2017-11-24 17:55:59 +01:00
parent c45d78aac4
commit 7911dd47da
5 changed files with 56 additions and 16 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2017-11-24 Florian Weimer <fweimer@redhat.com>
* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
bits/mman-shared.h.
* sysdeps/unix/sysv/linux/bits/mman-linux.h: Include
<bits/mman-shared.h>.
(MFD_CLOEXEC, MFD_ALLOW_SEALING, MFD_HUGETLB, memfd_create): Move
to ...
* sysdeps/unix/sysv/linux/bits/mman-shared.h: ... this new file.
Add #ifndef guard for the MFD_* constants based on MFD_CLOEXEC.
* sysdeps/unix/sysv/linux/hppa/bits/mman.h: Include
<bits/mman-shared.h>.
2017-11-24 Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #22457]

2
sysdeps/unix/sysv/linux/Makefile
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@ -39,7 +39,7 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
sys/timerfd.h sys/fanotify.h bits/eventfd.h bits/inotify.h \
bits/signalfd.h bits/timerfd.h bits/epoll.h \
bits/socket_type.h bits/syscall.h bits/sysctl.h \
bits/mman-linux.h \
bits/mman-linux.h bits/mman-shared.h \
bits/siginfo-arch.h bits/siginfo-consts-arch.h
tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \

16
sysdeps/unix/sysv/linux/bits/mman-linux.h
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@ -112,18 +112,4 @@
faulted in. */
#endif
#ifdef __USE_GNU
/* Flags for memfd_create. */
# define MFD_CLOEXEC 1U
# define MFD_ALLOW_SEALING 2U
# define MFD_HUGETLB 4U
__BEGIN_DECLS
/* Create a new memory file descriptor. NAME is a name for debugging.
FLAGS is a combination of the MFD_* constants. */
int memfd_create (const char *__name, unsigned int __flags) __THROW;
__END_DECLS
#endif /* __USE_GNU */
#include <bits/mman-shared.h>

39
sysdeps/unix/sysv/linux/bits/mman-shared.h Normal file
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@ -0,0 +1,39 @@
/* Memory-mapping-related declarations/definitions, not architecture-specific.
Copyright (C) 2017 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/>. */
#ifndef _SYS_MMAN_H
# error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
#endif
#ifdef __USE_GNU
/* Flags for memfd_create. */
# ifndef MFD_CLOEXEC
# define MFD_CLOEXEC 1U
# define MFD_ALLOW_SEALING 2U
# define MFD_HUGETLB 4U
# endif
__BEGIN_DECLS
/* Create a new memory file descriptor. NAME is a name for debugging.
FLAGS is a combination of the MFD_* constants. */
int memfd_create (const char *__name, unsigned int __flags) __THROW;
__END_DECLS
#endif /* __USE_GNU */

2
sysdeps/unix/sysv/linux/hppa/bits/mman.h
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@ -110,3 +110,5 @@
# define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
# define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
#endif
#include <bits/mman-shared.h>