"Linux Advanced Programming" (tenth) Linux asynchronous signal processing mechanism

Send Signal

Kill the current terminal with the KILL command at the terminal

R

As above, when using kill-sigcont 2563 , the terminal ignores the signal

When using kill-sigabrt 2563 , the terminal exits. Need to re-enter user name password login.

int Kill (__pid_t __pid, int __sig) : Sends a signal to the specified process . The first parameter is the process number to pass the signal, and the second parameter is the signal value to send.

int raise (int __sig) : Sends a signal to the current process that wakes up a process. Returns 0 successfully, otherwise returns-1.

Equivalent to

if int __sig) = =-1)    perror ("raise");

Using the Raise function

if 0 )    perror ("Failed to raise SIGUSR1");

unsigned int alarm (unsigned int __seconds) : Generates a SIGALRM signal to the current process within a specified time. Each time this function is called, a signal is generated, not a loop that generates a signal. The process terminates execution when the signal is received by default.

"Linux Advanced Programming" (tenth) Linux asynchronous signal processing mechanism