patch 8.2.0711: temp directory might be cleared
Problem: With a long running Vim the temp directory might be cleared on
some systems.
Solution: Lock the temp directory. (closes #6044)
diff --git a/src/configure.ac b/src/configure.ac
index 687bdf9..8751b2e 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -4060,6 +4060,21 @@
AC_MSG_RESULT(yes); AC_DEFINE(HAVE_RENAME),
AC_MSG_RESULT(no))
+dnl check for dirfd()
+AC_MSG_CHECKING(for dirfd)
+AC_TRY_COMPILE(
+[#include <sys/types.h>
+#include <dirent.h>],
+[DIR * dir=opendir("dirname"); dirfd(dir);],
+AC_MSG_RESULT(yes); AC_DEFINE(HAVE_DIRFD), AC_MSG_RESULT(not usable))
+
+dnl check for flock()
+AC_MSG_CHECKING(for flock)
+AC_TRY_COMPILE(
+[#include <sys/file.h>],
+[flock(10, LOCK_SH);],
+AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FLOCK), AC_MSG_RESULT(not usable))
+
dnl sysctl() may exist but not the arguments we use
AC_MSG_CHECKING(for sysctl)
AC_TRY_COMPILE(