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Full Discussion: Some interesting questions
Top Forums UNIX for Dummies Questions & Answers Some interesting questions Post 64916 by Perderabo on Wednesday 2nd of March 2005 05:59:24 PM
Old 03-02-2005
For some of this, it's not clear what you want. For many signals, the default action is to terminate the process. This means the kernel kills it pretty much as if the process had called exit(). Some signals can be "caught". This means that a function runs instead. Well behaved processes catch signals and clean up temp files, release resources, etc. But a process cannot catch 9. 9 will instantly kill a process (if it's killable).

A pipe, you write data on one side and read the data from the other side. What else do you want here?

process1 | process2
Kill either process and nothing at all happens to the other process. However the pipe is broken. If process1 dies, the next time that process2 tries a read from the pipe, it will get eof. Many programs will decide to exit at this point. If process2 dies, process1 will get a SIGPIPE on the next write. The default action for SIGPIPE is exit. But a program can catch or ignore the signal. Both mechanisms depend on data flowing across the pipe.
 

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LEARN ABOUT OSX

kill

KILL(1) 						    BSD General Commands Manual 						   KILL(1)

NAME

     kill -- terminate or signal a process

SYNOPSIS

     kill [-s signal_name] pid ...
     kill -l [exit_status]
     kill -signal_name pid ...
     kill -signal_number pid ...

DESCRIPTION

     The kill utility sends a signal to the processes specified by the pid operand(s).

     Only the super-user may send signals to other users' processes.

     The options are as follows:

     -s signal_name
	     A symbolic signal name specifying the signal to be sent instead of the default TERM.

     -l [exit_status]
	     If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status.

     -signal_name
	     A symbolic signal name specifying the signal to be sent instead of the default TERM.

     -signal_number
	     A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.

     The following pids have special meanings:
     -1      If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.

     Some of the more commonly used signals:
     1	     HUP (hang up)
     2	     INT (interrupt)
     3	     QUIT (quit)
     6	     ABRT (abort)
     9	     KILL (non-catchable, non-ignorable kill)
     14      ALRM (alarm clock)
     15      TERM (software termination signal)

     Some shells may provide a builtin kill command which is similar or identical to this utility.  Consult the builtin(1) manual page.

SEE ALSO

     builtin(1), csh(1), killall(1), ps(1), kill(2), sigaction(2)

STANDARDS

     The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

     A kill command appeared in Version 6 AT&T UNIX.

BUGS

     A replacement for the command ``kill 0'' for csh(1) users should be provided.

BSD
								  April 28, 1995							       BSD
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