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So, it turns out SIGCHLD is discarded by default, so we have to set up

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a dummy handler to make it interrupt an ioctl(2) or select(2).

This makes those short-lived iscsid(8) zombies disappear.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
trasz 2014-02-11 10:47:28 +00:00
parent 39c661e770
commit 14f5d801bf
1 changed files with 28 additions and 0 deletions
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28
usr.sbin/iscsid/iscsid.c
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@ -393,6 +393,32 @@ set_timeout(int timeout)
log_err(1, "setitimer");
}
static void
sigchld_handler(int dummy __unused)
{
/*
* The only purpose of this handler is to make SIGCHLD
* interrupt the ISCSIDWAIT ioctl(2), so we can call
* wait_for_children().
*/
}
static void
register_sigchld(void)
{
struct sigaction sa;
int error;
bzero(&sa, sizeof(sa));
sa.sa_handler = sigchld_handler;
sigfillset(&sa.sa_mask);
error = sigaction(SIGCHLD, &sa, NULL);
if (error != 0)
log_err(1, "sigaction");
}
static void
handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
{
@ -522,6 +548,8 @@ main(int argc, char **argv)
pidfile_write(pidfh);
register_sigchld();
for (;;) {
log_debugx("waiting for request from the kernel");