add more user-defined signals Post: 302438624

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Top Forums Programming add more user-defined signals Post 302438624 by JohnGraham on Tuesday 20th of July 2010 08:15:55 AM

07-20-2010

Registered User

Quote:

Originally Posted by naamabm

1) In case I "take over" SIGHUP signal, can I use the "kill" function in order to raise it?
kill(pid, SIGHUP);
and the signal function in order to catch it on the other side?
signal(SIGHUP, sig_handler)

Yes - there is no real difference between SIGUSR1/SIGUSR2 and SIGHUP - you can kill() them in exactly the same way, and you set up the signal handler with signal() in the same way.

Quote:

Originally Posted by naamabm

2) Just to make sure I understand the second you were talking about (IPC messages / named pipe) it requires both processes to "pull" from the shared memory the details and don't have something to wake the process (or in other words- it doesn't signal the process) right?
If so, that doesn't help me...

I'm not sure about what you mean by "pull" from shared memory - there's certainly no requirement to actually use any shared memory. Both processes will need to know the name of the pipe. While it doesn't technically speaking "signal" the process, you can make a blocking read() from the pipe, and you're blocked until someone writes to it/there's an error, so your program will sit dormant until there's something to do.

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LEARN ABOUT LINUX

ddi_can_receive_sig

ddi_can_receive_sig(9F) 				   Kernel Functions for Drivers 				   ddi_can_receive_sig(9F)

NAME

       ddi_can_receive_sig - Test for ability to receive signals

SYNOPSIS

       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       boolean_t ddi_can_receive_sig(void);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       None.

DESCRIPTION

       The  ddi_can_receive_sig() function returns a boolean value	indicating whether the current thread can receive signals sent by kill(2).
       If the return value is  B_FALSE, then the calling  thread  cannot receive  signals, and any  call  to  qwait_sig(9F),  cv_wait_sig(9F),	or
       cv_timedwait_sig(9F)  implicitly  becomes  qwait(9F),  cv_wait(9F), or  cv_timedwait(9F), respectively. Drivers that can block indefinitely
       awaiting an event should use this function to determine if additional means (such as timeout(9F)) may be necessary to avoid creating unkil-
       lable threads.

RETURN VALUES

       B_FALSE		       The   calling thread is in a state in which signals	      cannot be  received. For	example, the thread is not
			       associated with a user process or is in the midst of exit(2) handling.

       B_TRUE		       The calling thread may receive a signal while blocked		on a condition variable. Note that  this  function
			       does not check to  determine whether signals are blocked (see sigprocmask(2)).

CONTEXT

       The ddi_can_receive_sig() function  may be called from user, kernel, or interrupt context.

SEE ALSO

       close(9E), cv_wait(9F), qwait(9F)

SunOS 5.10							    15 Dec 2003 					   ddi_can_receive_sig(9F)