int
mgmt_ipc_listen(void)
{
int fd, err, addr_len;
struct sockaddr_un addr;
/* first check if we have fd handled by systemd */
fd = mgmt_ipc_systemd();
if (fd >= 0)
return fd;
/* manually establish a socket */
fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (fd < 0) {
log_error("Can not create IPC socket");
return fd;
}
addr_len = setup_abstract_addr(&addr, ISCSIADM_NAMESPACE);
if ((err = bind(fd, (struct sockaddr *) &addr, addr_len)) < 0 ) {
log_error("Can not bind IPC socket");
close(fd);
return err;
}
if ((err = listen(fd, 32)) < 0) {
log_error("Can not listen IPC socket");
close(fd);
return err;
}
return fd;
}
static int ipc_connect(int *fd, char *unix_sock_name, int start_iscsid)
{
int nsec, addr_len;
struct sockaddr_un addr;
*fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (*fd < 0) {
log_error("can not create IPC socket (%d)!", errno);
return ISCSI_ERR_ISCSID_NOTCONN;
}
addr_len = setup_abstract_addr(&addr, unix_sock_name);
/*
* Trying to connect with exponential backoff
*/
for (nsec = 1; nsec <= MAXSLEEP; nsec <<= 1) {
if (connect(*fd, (struct sockaddr *) &addr, addr_len) == 0)
/* Connection established */
return ISCSI_SUCCESS;
/* If iscsid isn't there, there's no sense
* in retrying. */
if (errno == ECONNREFUSED) {
if (start_iscsid && nsec == 1)
iscsid_startup();
else
break;
}
/*
* Delay before trying again
*/
if (nsec <= MAXSLEEP/2)
sleep(nsec);
}
log_error("can not connect to iSCSI daemon (%d)!", errno);
return ISCSI_ERR_ISCSID_NOTCONN;
}