diff --git a/src/call.rs b/src/call.rs
index baa6737..6ea8b2f 100644
--- a/src/call.rs
+++ b/src/call.rs
@@ -37,6 +37,10 @@ pub fn chdir(path: &str) -> Result<usize> {
     unsafe { syscall2(SYS_CHDIR, path.as_ptr() as usize, path.len()) }
 }
 
+pub fn chmod(path: &str, mode: usize) -> Result<usize> {
+    unsafe { syscall3(SYS_CHMOD, path.as_ptr() as usize, path.len(), mode) }
+}
+
 /// Produce a fork of the current process, or a new process thread
 pub unsafe fn clone(flags: usize) -> Result<usize> {
     syscall1_clobber(SYS_CLONE, flags)
diff --git a/src/flag.rs b/src/flag.rs
index 4f4f2a0..0d0f95a 100644
--- a/src/flag.rs
+++ b/src/flag.rs
@@ -21,12 +21,6 @@ pub const EVENT_WRITE: usize = 2;
 
 pub const F_GETFL: usize = 1;
 pub const F_SETFL: usize = 2;
-pub const F_GETMODE: usize = 3;
-pub const F_SETMODE: usize = 4;
-pub const F_GETUID: usize = 5;
-pub const F_SETUID: usize = 6;
-pub const F_GETGID: usize = 7;
-pub const F_SETGID: usize = 8;
 
 pub const FUTEX_WAIT: usize = 0;
 pub const FUTEX_WAKE: usize = 1;
diff --git a/src/number.rs b/src/number.rs
index 4768aa0..db90dcd 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -13,6 +13,7 @@ pub const SYS_RET_FILE: usize = 0x0010_0000;
 pub const SYS_LINK: usize =     SYS_CLASS_PATH | SYS_ARG_PATH | 9;
 pub const SYS_OPEN: usize =     SYS_CLASS_PATH | SYS_RET_FILE | 5;
 pub const SYS_MKDIR: usize =    SYS_CLASS_PATH | 39;
+pub const SYS_CHMOD: usize =    SYS_CLASS_PATH | 15;
 pub const SYS_RMDIR: usize =    SYS_CLASS_PATH | 84;
 pub const SYS_UNLINK: usize =   SYS_CLASS_PATH | 10;
 
diff --git a/src/scheme.rs b/src/scheme.rs
index c3111fb..73f9065 100644
--- a/src/scheme.rs
+++ b/src/scheme.rs
@@ -7,6 +7,7 @@ pub trait Scheme {
         packet.a = Error::mux(match packet.a {
             SYS_OPEN => self.open(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d, packet.uid, packet.gid),
             SYS_MKDIR => self.mkdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d as u16, packet.uid, packet.gid),
+            SYS_CHMOD => self.chmod(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d as u16, packet.uid, packet.gid),
             SYS_RMDIR => self.rmdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
             SYS_UNLINK => self.unlink(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
 
@@ -39,6 +40,11 @@ pub trait Scheme {
         Err(Error::new(ENOENT))
     }
 
+    #[allow(unused_variables)]
+    fn chmod(&self, path: &[u8], mode: u16, uid: u32, gid: u32) -> Result<usize> {
+        Err(Error::new(ENOENT))
+    }
+
     #[allow(unused_variables)]
     fn rmdir(&self, path: &[u8], uid: u32, gid: u32) -> Result<usize> {
         Err(Error::new(ENOENT))
@@ -116,6 +122,7 @@ pub trait SchemeMut {
         packet.a = Error::mux(match packet.a {
             SYS_OPEN => self.open(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d, packet.uid, packet.gid),
             SYS_MKDIR => self.mkdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d as u16, packet.uid, packet.gid),
+            SYS_CHMOD => self.chmod(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.d as u16, packet.uid, packet.gid),
             SYS_RMDIR => self.rmdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
             SYS_UNLINK => self.unlink(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
 
@@ -147,6 +154,11 @@ pub trait SchemeMut {
         Err(Error::new(ENOENT))
     }
 
+    #[allow(unused_variables)]
+    fn chmod(&self, path: &[u8], mode: u16, uid: u32, gid: u32) -> Result<usize> {
+        Err(Error::new(ENOENT))
+    }
+
     #[allow(unused_variables)]
     fn rmdir(&mut self, path: &[u8], uid: u32, gid: u32) -> Result<usize> {
         Err(Error::new(ENOENT))