1 From 0cb66c0c5aafd48b63a755860746e70afb332c8d Mon Sep 17 00:00:00 2001
2 From: Tanu Kaskinen <tanuk@iki.fi>
3 Date: Wed, 24 Jan 2018 03:51:49 +0200
4 Subject: [PATCH] memfd-wrappers: only define memfd_create() if not already
7 glibc 2.27 is to be released soon, and it will provide memfd_create().
8 If glibc provides the function, we must not define it ourselves,
9 otherwise building fails due to conflict between the two implementations
12 BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=104733
14 Upstream-Status: Submitted [https://bugs.freedesktop.org/attachment.cgi?id=136927]
15 Signed-off-by: Khem Raj <raj.khem@gmail.com>
18 src/pulsecore/memfd-wrappers.h | 7 ++++---
19 2 files changed, 7 insertions(+), 3 deletions(-)
21 diff --git a/configure.ac b/configure.ac
22 index 77b5ff5..3a71fd8 100644
25 @@ -607,6 +607,9 @@ AS_IF([test "x$enable_memfd" = "xyes" && test "x$HAVE_MEMFD" = "x0"],
26 [AC_MSG_ERROR([*** Your Linux kernel does not support memfd shared memory.
27 *** Use linux v3.17 or higher for such a feature.])])
29 +AS_IF([test "x$HAVE_MEMFD" = "x1"],
30 + AC_CHECK_FUNCS([memfd_create]))
33 AM_CONDITIONAL([HAVE_MEMFD], [test "x$HAVE_MEMFD" = x1])
34 AS_IF([test "x$HAVE_MEMFD" = "x1"], AC_DEFINE([HAVE_MEMFD], 1, [Have memfd shared memory.]))
35 diff --git a/src/pulsecore/memfd-wrappers.h b/src/pulsecore/memfd-wrappers.h
36 index 3bed9b2..c7aadfd 100644
37 --- a/src/pulsecore/memfd-wrappers.h
38 +++ b/src/pulsecore/memfd-wrappers.h
40 License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
44 +#if defined(HAVE_MEMFD) && !defined(HAVE_MEMFD_CREATE)
46 #include <sys/syscall.h>
50 - * No glibc wrappers exist for memfd_create(2), so provide our own.
51 + * Before glibc version 2.27 there was no wrapper for memfd_create(2),
52 + * so we have to provide our own.
54 * Also define memfd fcntl sealing macros. While they are already
55 * defined in the kernel header file <linux/fcntl.h>, that file as
56 @@ -63,6 +64,6 @@ static inline int memfd_create(const char *name, unsigned int flags) {
57 #define F_SEAL_WRITE 0x0008 /* prevent writes */
60 -#endif /* HAVE_MEMFD */
61 +#endif /* HAVE_MEMFD && !HAVE_MEMFD_CREATE */