sigaction : using "void (*sa_sigaction)(int, siginfo_t *, void *);"

[hpandey]

sigaction : using "void (*sa_sigaction) (int, siginfo_t *, void *);"
--------------------------------------------------------------------------------

hello,

in sigaction manpage it's written :

sa_sigaction also specifies the action to be associated with signum.
This function receives the signal number as its first argument, a
pointer to a siginfo_t as its second argument and a pointer to a ucon-
text_t (cast to void *) as its third argument.

so we can pass arguments to the signal handler (throught "void*"), but I
can't find the way...
no way to put it anywhere...

example :

void ping(int sig, siginfo_t *siginf, void *ptr)
{
....
}

int main()
{
struct sigaction sa_ping;
int foo;

foo = 3;

sa_ping.sa_siga ction = ping;
sigemptyset(&sa _ping.sa_mask);
sa_ping.sa_flag s = 0;
sigaction(SIGUS R1, &sa_ping, 0);
....
}

where I can pass foo value in argument in ping (with a cast in (int *) )???


if someone has an idea, I'll be thankfull

Harish

[horace1]

have a look at the opengroup documentation on sigaction()
http://www.opengroup.o rg/onlinepubs/009695399/functions/sigaction.html

It shows an example which may help