Constant SYS_IPC_TRY_RECV 

pub const SYS_IPC_TRY_RECV: usize = 207; // 207usize

Non-blocking receive from an IPC port.

• port_handle: capability handle of the port
• buf_ptr: buffer to receive the message
• buf_len: size of the buffer

Returns the number of bytes received, or 0 if no message is available (does not block). Returns -EAGAIN if the port is empty.