diff --git a/core/sys/linux/constants.odin b/core/sys/linux/constants.odin
index f3e9f5ff9e4..129444d0f9a 100644
--- a/core/sys/linux/constants.odin
+++ b/core/sys/linux/constants.odin
@@ -1,5 +1,20 @@
 package linux
 
+/*
+	Standard input file descriptor
+*/
+STDIN_FILENO :: Fd(0)
+
+/*
+	Standard output file descriptor
+*/
+STDOUT_FILENO :: Fd(1)
+
+/*
+	Standard error file descriptor
+*/
+STDERR_FILENO :: Fd(2)
+
 /*
 	Special file descriptor to pass to `*at` functions to specify
 	that relative paths are relative to current directory.
diff --git a/core/sys/linux/sys.odin b/core/sys/linux/sys.odin
index ec7357c48d3..d729ab330f2 100644
--- a/core/sys/linux/sys.odin
+++ b/core/sys/linux/sys.odin
@@ -232,7 +232,18 @@ rt_sigprocmask :: proc "contextless" (mask_kind: Sig_Mask_Kind, new_set: ^Sig_Se
 	return Errno(-ret)
 }
 
-// TODO(flysand): ioctl
+/*
+	Control devices. The ioctl syscall is a bit special because
+	its argument is usually a pointer to some driver-specific structure.
+	The request value is device-specific. Consult your LibC implementation's
+	ioctls.h file to learn more. The returned value of ioctl *may* be an error
+	code value instead of a memory address depending on the request type.
+	Available since Linux 1.0.
+*/
+ioctl :: proc "contextless" (fd: Fd, request: u32, arg: uintptr) -> (uintptr) {
+	ret := syscall(SYS_ioctl, fd, request, arg)
+	return uintptr(ret)
+}
 
 /*
 	Read the file at a specified offset.