Add memfd functionality

3 files changed, 24 insertions, 0 deletions

diff --git a/src/sys/memfd.rs b/src/sys/memfd.rs
new file mode 100644
index 00000000..e142218f
--- /dev/null
+++ b/src/sys/memfd.rs
@@ -0,0 +1,18 @@
+use libc;
+use std::os::unix::io::RawFd;
+use {Error, Result};
+use std::ffi::CStr;
+
+bitflags!(
+    flags MemFdCreateFlag: libc::c_uint {
+        const MFD_CLOEXEC       = 0x0001,
+        const MFD_ALLOW_SEALING = 0x0002,
+    }
+);
+
+pub fn memfd_create(name: &CStr, flags: MemFdCreateFlag) -> Result<RawFd> {
+    use sys::syscall::{syscall, MEMFD_CREATE};
+    let res = unsafe { syscall(MEMFD_CREATE, name.as_ptr(), flags.bits()) };
+    if res == -1 { Err(Error::last()) }
+    else { Ok(res as RawFd) }
+}
diff --git a/src/sys/mod.rs b/src/sys/mod.rs
index c124359d..3df06c44 100644
--- a/src/sys/mod.rs
+++ b/src/sys/mod.rs
@@ -9,6 +9,9 @@ pub mod event;
 #[cfg(feature = "eventfd")]
 pub mod eventfd;
 
+#[cfg(target_os = "linux")]
+pub mod memfd;
+
 #[cfg(not(any(target_os = "ios", target_os = "freebsd")))]
 pub mod ioctl;
 
diff --git a/src/sys/syscall.rs b/src/sys/syscall.rs
index 0f6a5e0b..c80defa2 100644
--- a/src/sys/syscall.rs
+++ b/src/sys/syscall.rs
@@ -11,6 +11,7 @@ mod arch {
     pub type Syscall = c_long;
 
     pub static SYSPIVOTROOT: Syscall = 155;
+    pub static MEMFD_CREATE: Syscall = 319;
 }
 
 #[cfg(target_arch = "x86")]
@@ -20,6 +21,7 @@ mod arch {
     pub type Syscall = c_long;
 
     pub static SYSPIVOTROOT: Syscall = 217;
+    pub static MEMFD_CREATE: Syscall = 356;
 }
 
 #[cfg(target_arch = "arm")]
@@ -29,6 +31,7 @@ mod arch {
     pub type Syscall = c_long;
 
     pub static SYSPIVOTROOT: Syscall = 218;
+    pub static MEMFD_CREATE: Syscall = 385;
 }