linux: Add missing Linux-specific fcntls

Also move F_DUPFD_CLOEXEC up a level as it is available on Android.

This commit leaves file sealing related fcntls and bitflag constants out
of "plain" Linux, as they are defined in `linux/fcntl.h` rather than
`fcntl.h`. They can be included once an approach for verification has
been figured out. Android and musl both include them in `fcntl.h`
however. See #235 for more detail.

Author: kamalmarhubi

src/unix/notbsd/android/mod.rs

@@ -544,6 +544,15 @@ pub const RTLD_GLOBAL: ::c_int = 0x2;
 pub const RTLD_NOLOAD: ::c_int = 0x4;
 pub const RTLD_NOW: ::c_int = 0;
 
+// TODO(#235): Move these to unix::notbsd once verification is figured out.
+pub const F_ADD_SEALS: ::c_int = 1033;
+pub const F_GET_SEALS: ::c_int = 1034;
+
+pub const F_SEAL_SEAL: ::c_int = 0x0001;
+pub const F_SEAL_SHRINK: ::c_int = 0x0002;
+pub const F_SEAL_GROW: ::c_int = 0x0004;
+pub const F_SEAL_WRITE: ::c_int = 0x0008;
+
 f! {
     pub fn sigemptyset(set: *mut sigset_t) -> ::c_int {
         *set = 0;

src/unix/notbsd/linux/mod.rs

@@ -315,8 +315,6 @@ pub const RTLD_NOW: ::c_int = 0x2;
 
 pub const TCP_MD5SIG: ::c_int = 14;
 
-pub const F_DUPFD_CLOEXEC: ::c_int = 1030;
-
 pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
     __align: [],
     size: [0; __SIZEOF_PTHREAD_MUTEX_T],

src/unix/notbsd/linux/musl/mod.rs

@@ -148,6 +148,15 @@ pub const TIOCINQ: ::c_ulong = ::FIONREAD;
 pub const RTLD_GLOBAL: ::c_int = 0x100;
 pub const RTLD_NOLOAD: ::c_int = 0x4;
 
+// TODO(#235): Move these to unix::notbsd once verification is figured out.
+pub const F_ADD_SEALS: ::c_int = 1033;
+pub const F_GET_SEALS: ::c_int = 1034;
+
+pub const F_SEAL_SEAL: ::c_int = 0x0001;
+pub const F_SEAL_SHRINK: ::c_int = 0x0002;
+pub const F_SEAL_GROW: ::c_int = 0x0004;
+pub const F_SEAL_WRITE: ::c_int = 0x0008;
+
 extern {
     pub fn getnameinfo(sa: *const ::sockaddr,
                        salen: ::socklen_t,

src/unix/notbsd/mod.rs

@@ -161,6 +161,16 @@ pub const F_SETFD: ::c_int = 2;
 pub const F_GETFL: ::c_int = 3;
 pub const F_SETFL: ::c_int = 4;
 
+// Linux-specific fcntls
+pub const F_SETLEASE: ::c_int = 1024;
+pub const F_GETLEASE: ::c_int = 1025;
+pub const F_NOTIFY: ::c_int = 1026;
+pub const F_DUPFD_CLOEXEC: ::c_int = 1030;
+pub const F_SETPIPE_SZ: ::c_int = 1031;
+pub const F_GETPIPE_SZ: ::c_int = 1032;
+
+// TODO(#235): Include file sealing fcntls once we have a way to verify them.
+
 pub const SIGTRAP: ::c_int = 5;
 
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;