dear all:
There is a demo for kqueue and signal, Under FreeBSD4.9, I can get the
output of "got SIGCHLD by kqueue". But I can't get the same result under
FreeBSD5.4. I'd appreciate that if anyone can let me know why this
happend. Here is my code:
#include <unistd.h>
#include <string.h>
#include <sys/event.h>
#include <stdio.h>
#include <signal.h>
#define DEBUG(x...) fprintf(stderr, x)
int main()
{
int kq, res;
struct kevent ke;
kq = kqueue();
if ( kq < 0 )
{
DEBUG("init kqueue failed %s : %d\n", __FILE__, __LINE__);
return -1;
}
//when remove this code, everything is ok....what diffence with 4.9 and 5.4?
if ( signal(SIGCHLD, SIG_IGN) == SIG_ERR )
{
DEBUG("signal failed %s : %d\n", __FILE__, __LINE__);
}
EV_SET(&ke, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if ( kevent(kq, &ke, 1, NULL, 0, NULL) < 0 )
{
DEBUG("kevent failed %s : %d\n", __FILE__, __LINE__);
return -1;
}
EV_SET(&ke, 1, EVFILT_TIMER, EV_ADD, 0, 1000, NULL);
if ( kevent(kq, &ke, 1, NULL, 0, NULL) < 0 )
{
return -1;
}
while(1)
{
bzero(&ke, sizeof( struct kevent) );
res = kevent(kq, NULL, 0, &ke, 1, NULL);
if ( res == 0 )
continue;
if ( res < 0 )
{
DEBUG("kevent failed %s : %d\n", __FILE__, __LINE__);
return -1;
}
if (ke.ident == SIGCHLD )
{
DEBUG("got SIGCHLD by kqueue\n");
}
else if ( ke.ident == 1 && ke.filter == EVFILT_TIMER )
{
DEBUG("time out\n");
res = fork();
if ( res < 0 )
{
DEBUG("Fork Error\n");
return -1;
}
else if ( res == 0 )
{
DEBUG("Child ...\n");
return 0;
}
else
{
DEBUG("Father ...\n");
}
}
}
return 0;
}
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