snmp4lptp: Added function for data collection from ptp4l program.

General function to use for sending signals for data collection
from ptp4l program.

Signed-off-by: Anders Selhammer <anders.selhammer@est.tech>

snmp4lptp.c

@@ -17,6 +17,9 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
+#include <errno.h>
+#include <poll.h>
+
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
 #include <net-snmp/agent/net-snmp-agent-includes.h>
@@ -24,10 +27,44 @@
 #include "config.h"
 #include "pmc_common.h"
 #include "print.h"
+#include "snmp4lptp_mib.h"
 #include "util.h"
 
+#define SNMP_NFD 1
 static struct pmc *pmc;
 
+struct ptp_message* snmp4lptp_run_pmc(char *cmd)
+{
+	struct pollfd pollfd[SNMP_NFD];
+	int cnt, tmo = 100;
+
+	pollfd[0].fd = pmc_get_transport_fd(pmc);
+	pollfd[0].events = POLLIN | POLLPRI;
+
+	if (cmd && pmc_do_command(pmc, cmd)) {
+		pr_err("bad command: %s", cmd);
+	}
+
+	while (is_running()) {
+		cnt = poll(pollfd, SNMP_NFD, tmo);
+		if (cnt < 0) {
+			if (EINTR == errno) {
+				continue;
+			} else {
+				pr_emerg("poll failed");
+				break;
+			}
+		} else if (!cnt) {
+			break;
+		}
+
+		if (pollfd[0].revents & (POLLIN|POLLPRI)) {
+			return pmc_recv(pmc);
+		}
+	}
+	return NULL;
+}
+
 static int open_pmc(struct config *cfg)
 {
 	char uds_local[MAX_IFNAME_SIZE + 1];

snmp4lptp_mib.h

@@ -0,0 +1,30 @@
+/**
+ * @file snmp4lptp_mib.h
+ * @brief Common header file for all supported mibs in linuxptp
+ * @note Copyright (C) 2018 Anders Selhammer <anders.selhammer@est.tech>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef HAVE_SNMP4LPTP_MIB_H
+#define HAVE_SNMP4LPTP_MIB_H
+
+#include "msg.h"
+
+/*
+ * function declarations
+ */
+struct ptp_message* snmp4lptp_run_pmc(char *cmd);
+
+#endif /* HAVE_SNMP4LPTP_MIB_H */