[mesos] 01/04: Exposed `memfd_create` syscall via `memfd::create` function.

[josephwu]

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josephwu pushed a commit to branch 1.7.x
in repository https://gitbox.apache.org/repos/asf/mesos.git

commit f6ec8e565e8a84cd54cd2bd27a76c493d89420a5
Author: Andrei Budnik <abud...@mesosphere.com>
AuthorDate: Fri Feb 22 16:37:38 2019 -0800

    Exposed `memfd_create` syscall via `memfd::create` function.
    
    This patch exposes a wrapper function for `memfd_create` system call.
    This function can be used to create an anonymous in-memory files on
    Linux.
    
    Review: https://reviews.apache.org/r/70009/
---
 src/linux/memfd.cpp | 12 +++---------
 src/linux/memfd.hpp | 12 ++++++++++++
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/src/linux/memfd.cpp b/src/linux/memfd.cpp
index 348d0ce..2cd6195 100644
--- a/src/linux/memfd.cpp
+++ b/src/linux/memfd.cpp
@@ -26,15 +26,9 @@
 #include <stout/os/open.hpp>
 #include <stout/os/stat.hpp>
 
-using std::string;
-
-#if !defined(MFD_CLOEXEC)
-#define MFD_CLOEXEC 0x0001U
-#endif
+#include "linux/memfd.hpp"
 
-#if !defined(MFD_ALLOW_SEALING)
-#define MFD_ALLOW_SEALING 0x0002U
-#endif
+using std::string;
 
 #if !defined(F_ADD_SEALS)
 #define F_ADD_SEALS 1033
@@ -64,7 +58,7 @@ namespace mesos {
 namespace internal {
 namespace memfd {
 
-static Try<int_fd> create(const string& name, unsigned int flags)
+Try<int_fd> create(const string& name, unsigned int flags)
 {
 #ifdef __NR_memfd_create
   int_fd fd = ::syscall(__NR_memfd_create, name.c_str(), flags);
diff --git a/src/linux/memfd.hpp b/src/linux/memfd.hpp
index 4cf9906..b2630d2 100644
--- a/src/linux/memfd.hpp
+++ b/src/linux/memfd.hpp
@@ -23,10 +23,22 @@
 
 #include <stout/os/int_fd.hpp>
 
+#if !defined(MFD_CLOEXEC)
+#define MFD_CLOEXEC 0x0001U
+#endif
+
+#if !defined(MFD_ALLOW_SEALING)
+#define MFD_ALLOW_SEALING 0x0002U
+#endif
+
 namespace mesos {
 namespace internal {
 namespace memfd {
 
+// Creates an anonymous in-memory file via `memfd_create`.
+Try<int_fd> create(const std::string& name, unsigned int flags);
+
+
 // Clone a file into a sealed private copy such that any attempt to
 // modify it will not modify the original binary. Returns the memfd of
 // the sealed copy.