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Full Discussion: Multiple Signals
Top Forums Programming Multiple Signals Post 34033 by S.P.Prasad on Friday 31st of January 2003 01:37:35 AM
Old 01-31-2003
First ,by Default , output to a terminal is line buffered and all other input/output is fully buffered.Hence I think it is not mandatory to call setvbuf ( ).

Secondly, I don't think the statement
printf ( " Finished Sleeping\n" ) was necessary cause the code will definitely print
"Called" as many times as you will send signal externally.

Thirdly If we send signals at intervals definitely the handler will be called that number of times.

I will explictly state my problem definition :
After we compiled and excuted this code , we opened up another teminal window and find out the pid of the executable. Assuming the pid to be 1234 we issued the following command at the prompt :

# kill -USR1 1234 ; kill -USR1 1234 ; kill -USR1 1234 ; kill -USR1 1234 ; kill -USR1 1234 ; kill -USR1 1234 ;kill -USR1 1234 \n

The desired output should be that the handler should be called 7 times but it was called only ONCE ???

Why ?
 

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LEARN ABOUT NETBSD

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 process(es) 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]
	     Display the name of the signal corresponding to exit_status.  exit_status may be the exit status of a command killed by a signal (see
	     the special sh(1) parameter '?') or a signal number.

	     If no operand is given, display the names of all the signals.

     -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.
     0	     Broadcast the signal to all processes in the current process group 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)

     kill is a built-in to csh(1); it allows job specifiers of the form ``%...'' as arguments so process id's are not as often used as kill argu-
     ments.  See csh(1) for details.

SEE ALSO

     csh(1), pgrep(1), pkill(1), ps(1), kill(2), sigaction(2), signal(7)

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.

BSD
								  April 28, 1995							       BSD
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