To send a signal, the sending process must have permission to do so.(superuser can send signals to any process) The kill function sends the specified signal, sig, to the process whose identifier is given by pid. The call will fail if the program doesn’t have permission to send the signal, often because the target process is owned by another user. Returned to the default behavior of causing the program to exit.Ī process may send a signal to another process, including itself, by calling kill. When you type Ctrl+C again, the program ends because the behavior of SIGINT has Typing Ctrl+C (shown as ^C in the following output) for the first time causes the program to react and Printf("\nHi! You are here becz of signal:%d\n",num) Printf("You are here becoz of signal:%d\n",num) Non-Maskable signals or interrupts are those interrupts whick cannot be changed or ignored by the user. Maskable signals or interrupts in Linux are those signals which can be changed or ignonered by the user. There are two types of signals in linux – The function to be called when the specified signal is received is given as func. The signal to be caught or ignored is given as argument sig.
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