In this way, I could control it from the command line by typing "kill -SIGUSR1 nnnn".) 3.1. Catching Signals for Fun and Profit! As you can guess the Unix "kill" command is one way to send signals to a process. By sheer unbelievable coincidence, there is a system call called kill() which does the same thing.

Re: Kill doesn't send SIGUSR1 Maybe it should, but in your example it seems not to. If you send the same signal from a wide variety of sources, and you are recieving it in only one destination, and you observe the signal is not making the full trip - why conclude that *all* sources are failing? Because of this capability, kill() can also be considered as a communication mechanism among processes with signals SIGUSR1 and SIGUSR2. The pid argument can also be zero or negative to indicate that the signal should be sent to a group of processes. View license @staticmethod def _TestRealProcess(): signal.signal(signal.SIGUSR1, signal.SIG_DFL) if utils.IsProcessHandlingSignal(os.getpid(), signal.SIGUSR1): raise Exception("SIGUSR1 is handled when it should not be") signal.signal(signal.SIGUSR1, lambda signum, frame: None) if not utils.IsProcessHandlingSignal(os.getpid(), signal.SIGUSR1): raise Exception("SIGUSR1 is not handled when it May 09, 2012 · SIGUSR1 is a user defined signal. That means if the process that receives a SIGUSR1 has been coded to handle it, it will do whatever action has been programmed for that signal. SIGUSR1 and SIGUSR2 are basically special signals that you can use for any defined purpose as opposed to the more commonly used signals like SIGINT, SIGQUIT and SIGKILL. And you wanted to kill the firefox process by its process id, then you'd do: kill -1 7667 Then you'd re-run the same ps command and check if the process was still running. If it is still running, then do a . kill -2 7667 working your way up to -9. To kill all processes started by your account, enter kill -1. kill -l 1) sighup 2) sigint 3) sigquit 4) sigill 5) sigtrap 6) sigabrt 7) sigbus 8) sigfpe 9) sigkill 10) sigusr1 11) sigsegv 12) sigusr2 13) sigpipe 14) sigalrm 15) sigterm 17) sigchld 18) sigcont 19) sigstop 20) sigtstp 21) sigttin 22) sigttou 23) sigurg 24) sigxcpu 25) sigxfsz 26) sigvtalrm 27) sigprof 28) sigwinch 29) sigio 30) sigpwr 31) sigsys 34) sigrtmin 35) sigrtmin+1 36) sigrtmin+2 kill -s [signal] [pid] For example, if a process isn't responding to the TERM signal (which allows the process to do final cleanup before quitting), you can go for the KILL signal (which doesn't let process do any cleanup). Following is the command you need to run in that case. kill -s KILL [pid] Q3. What all signals you can send using kill?

SIGUSR1 and SIGUSR2 The SIGUSR1 and SIGUSR2 signals are sent to a process to indicate user-defined conditions. SIGXCPU The SIGXCPU signal is sent to a process when it has used up the CPU for a duration that exceeds a certain predetermined user-settable value.

Oct 05, 2017 · SIGUSR1 signal is sent to the mongod process and performs log rotation. Another way doing log rotation is to enter mongo console by typing 'mongo' in command line. Then in database console execute

kill -l has showed the signal and kill -SIGUSR2 has sent the signal (killing the process). Check if you are running Bash or some other shell (e.g., dash, busybox, etc.)

The kill command is a wrapper around the kill() system call, which sends signals to processes or process groups on the system, referenced by their numeric process IDs (PIDs) or process group IDs (PGIDs). kill is always provided as a standalone utility as defined by the POSIX standard. The command kill sends the specified signal to the specified process or process group. If no signal is specified, the TERM signal is sent. The TERM signal will kill processes which do not catch this signal. For other processes, it may be necessary to use the KILL (9) signal, since this signal cannot be caught. kill(2) Sends a signal to a SIGUSR1 P1990 Term User-defined signal 1 SIGUSR2 P1990 Term User-defined signal 2 SIGVTALRM P2001 Term Virtual alarm clock (4.2BSD