add memfd

Author: Susurrus

libc-test/build.rs

@@ -221,6 +221,7 @@ fn main() {
         cfg.header("sys/personality.h");
         cfg.header("sys/swap.h");
         cfg.header("pty.h");
+        cfg.header("linux/memfd.h");
         if !uclibc {
             cfg.header("sys/sysinfo.h");
         }

src/unix/notbsd/mod.rs

@@ -803,6 +803,9 @@ pub const POLLNVAL: ::c_short = 0x20;
 pub const POLLRDNORM: ::c_short = 0x040;
 pub const POLLRDBAND: ::c_short = 0x080;
 
+pub const MFD_CLOEXEC: ::c_uint = 0x0001;
+pub const MFD_ALLOW_SEALING: ::c_uint = 0x0002;
+
 f! {
     pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> () {
         let fd = fd as usize;
@@ -992,6 +995,7 @@ extern {
     pub fn fexecve(fd: ::c_int, argv: *const *const ::c_char,
                    envp: *const *const ::c_char)
                    -> ::c_int;
+    pub fn memfd_create(name: *const ::c_char, flags: ::c_uint) -> ::c_int;
 }
 
 cfg_if! {