signal in process communication Post: 23394

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Top Forums Programming signal in process communication Post 23394 by Perderabo on Saturday 22nd of June 2002 11:02:29 AM

06-22-2002

Administrator Emeritus

There are several "families" of signal system calls. This is a very confusing situation. sighold(), sigset(), and sigrelse() all originated on System 5 Release 3. They were also documented in the SVID (System V Interface Definition).

I don't have access to a freeBSD system, but I just reviewed the online docs for freeBSD. It has two signal families available: the Berkeley family, and the Posix family. You are going to need to switch families. And I suggest that you switch to the Posix family. It is especially important that you pick a family. Don't mix system calls from different families in the same program.

I saw FreeBSD man pages for the following Posix signal system calls:
sigaction()
sigsuspend()
sigaltstack() (you will rarely need to use this one)
sigpending()
sigprocmask()

These system calls are probably going to be found more often than the other families. They will work on Suns. If you start using these calls, you will maximize the portability of your code.

Perderabo

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killall

killall(1M)															       killall(1M)

NAME

       killall - kill all active processes

SYNOPSIS

       [signal]

DESCRIPTION

       is a procedure used by to kill all active processes not directly related to the shutdown procedure.

       is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted.  sends
       the specified signal to all user processes in the system, with the following exceptions:

	      the process;

	      all processes (including background processes) associated with the terminal from which was invoked;

	      any process, if owned by

	      any process, if owned by

	      any process;

	      any process;

	      any process.

       obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).

       If no signal is specified, a default of (kill) is used.

       is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).

FILES

SEE ALSO

       fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).

STANDARDS CONFORMANCE

																       killall(1M)

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