Hello,
I introduced fasync to the file_operations of a char driver.
==================================================
My driver code is like:
static struct fasync_struct* fasync_data = NULL;
int func_fasync(int fd, struct file *filp, int on)
{
int result = 0;
result = fasync_helper(fd, filp, on, &fasync_data);
if( result < 0 ) return( result );
else return( 0 );
}
When sending a signal, call:
kill_fasync( &fasync_data, SIGIO, POLL_IN );
========================================================
In my application:
Declaration:
static struct sigaction _sigAction;
Init signal:
_sigAction.sa_flags = 0;
sigemptyset(&_sigAction.sa_mask);
sigaddset(&_sigAction.sa_mask, SIGCHLD);
sigaddset(&_sigAction.sa_mask, SIGUSR1);
sigaddset(&_sigAction.sa_mask, SIGIO);
_sigAction.sa_handler = sigio_handler;
if ( sigaction(SIGIO, &_sigAction, NULL) < 0 )
{
PRINT( ("Error!! setting sigio_handler\n") );
}
Setting Async of file descriptor:
fcntl( _fd, F_SETOWN, getpid() );
int oflags = fcntl( _fd, F_GETFL );
fcntl( _fd, F_SETFL, oflags | FASYNC);
===========================================================
kill_fasync is called from interrupt routine.
after kill_fasync is called, my sigio_handler is executed, however
after a lot of kill_fasync calls, my application is killed (by uclinux?).
With
uClinux prompt info:
> sh xx Child yy died
>
Note: without calling kill_fasync, my appl funs forever.
Question? What signal cause dying of my appl?? How can I debug this??
With strace?? (is not compiling in my distr 2.6.17-uc0)
Thanks for your info.
Regards
Teun Grinwis
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