From bdf0d0f0392b2438a1424fb869937d769e5a4552 Mon Sep 17 00:00:00 2001
From: Xavier de Gaye <xdegaye@users.sourceforge.net>
Date: Thu, 22 Dec 2016 10:38:59 +0100
Subject: [PATCH] Issue #28762: lockf() is available on Android API level 24,
 but the F_LOCK macro is not defined in android-ndk-r13.

---
 Misc/NEWS     |  3 +++
 configure     | 31 ++++++++++++++++++++++++++++++-
 configure.ac  | 11 ++++++++++-
 pyconfig.h.in |  4 ++--
 4 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index 85e7823eb38..b9644df9721 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -84,6 +84,9 @@ Tests
 Build
 -----
 
+- Issue #28762: lockf() is available on Android API level 24, but the F_LOCK
+  macro is not defined in android-ndk-r13.
+
 - Issue #28538: Fix the compilation error that occurs because if_nameindex() is
   available on Android API level 24, but the if_nameindex structure is not
   defined.
diff --git a/configure b/configure
index a05009a1da9..e10510df28c 100755
--- a/configure
+++ b/configure
@@ -11198,7 +11198,7 @@ for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
  futimens futimes gai_strerror getentropy \
  getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
- initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
+ initgroups kill killpg lchmod lchown linkat lstat lutimes mmap \
  memrchr mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
  posix_fallocate posix_fadvise pread \
@@ -12686,6 +12686,35 @@ else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+# Issue #28762: lockf() is available on Android API level 24, but the F_LOCK
+# macro is not defined in android-ndk-r13.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for lockf" >&5
+$as_echo_n "checking for lockf... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <unistd.h>
+int
+main ()
+{
+lockf(0, F_LOCK, 0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+
+$as_echo "#define HAVE_LOCKF 1" >>confdefs.h
+
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
diff --git a/configure.ac b/configure.ac
index 8099e27c776..9ffdfdfd5a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3384,7 +3384,7 @@ AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
  futimens futimes gai_strerror getentropy \
  getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
- initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
+ initgroups kill killpg lchmod lchown linkat lstat lutimes mmap \
  memrchr mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
  posix_fallocate posix_fadvise pread \
@@ -3761,6 +3761,15 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
   [AC_MSG_RESULT(no)
 ])
 
+# Issue #28762: lockf() is available on Android API level 24, but the F_LOCK
+# macro is not defined in android-ndk-r13.
+AC_MSG_CHECKING(for lockf)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h> ]],[[lockf(0, F_LOCK, 0);]])],
+  [AC_DEFINE(HAVE_LOCKF, 1, Define to 1 if you have the 'lockf' function and the F_LOCK macro.)
+   AC_MSG_RESULT(yes)],
+  [AC_MSG_RESULT(no)
+])
+
 # On OSF/1 V5.1, getaddrinfo is available, but a define
 # for [no]getaddrinfo in netdb.h.
 AC_MSG_CHECKING(for getaddrinfo)
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 6b376a646f3..b10c57f85de 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -472,7 +472,7 @@
 /* Define to 1 if you have the <ieeefp.h> header file. */
 #undef HAVE_IEEEFP_H
 
-/* Define to 1 if you have the `if_nameindex' function. */
+/* Define to 1 if you have the 'if_nameindex' function. */
 #undef HAVE_IF_NAMEINDEX
 
 /* Define if you have the 'inet_aton' function. */
@@ -574,7 +574,7 @@
 /* Define to 1 if you have the <linux/tipc.h> header file. */
 #undef HAVE_LINUX_TIPC_H
 
-/* Define to 1 if you have the `lockf' function. */
+/* Define to 1 if you have the 'lockf' function and the F_LOCK macro. */
 #undef HAVE_LOCKF
 
 /* Define to 1 if you have the `log1p' function. */