Hi Experts, I have a system in which there is a only 1 user process and a corresponding kernel module (driver) associated with it to send and receive data to the user process. In the kernel module, i have a semaphore to protect a critical section of code during the rx and tx paths. However, at some instance of code execution, the down_interruptible returns EINTR, which means that the user process has received some interrupt due to which the process has come out of sleep due to the signal it received, due to which the kernel module has not got the semaphore. At this point of time, i have no idea as to which signal has triggered the user process to come out of the sleep. Is there a way in which we can know which signal has a process received, without registering any user defined handler to it? Any thoughts/ideas on debugging this problem can be of great help. Also please correct me if i am wrong in any of my understanding regarding down_interruptible. Regards, Vijay