Change in osmo-ggsn[master]: ggsn: Log tun fd write errors

[pespin]

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ggsn/+/24494 )


Change subject: ggsn: Log tun fd write errors
......................................................................

ggsn: Log tun fd write errors

Change-Id: I5f681b5edcc4cf525629d2078ae0c0ffd7ebb72d
---
M ggsn/ggsn.h
M lib/tun.c
M lib/tun.h
3 files changed, 11 insertions(+), 4 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/94/24494/1

diff --git a/ggsn/ggsn.h b/ggsn/ggsn.h
index 82984a0..132d059 100644
--- a/ggsn/ggsn.h
+++ b/ggsn/ggsn.h
@@ -167,6 +167,3 @@
 	LOGP(DGGSN, level, "GGSN(%s): " fmt, (ggsn)->cfg.name, ## args)
 
 #define LOGPPDP(level, pdp, fmt, args...) LOGPDPX(DGGSN, level, pdp, fmt, ## args)
-
-#define LOGTUN(level, tun, fmt, args...) \
-	LOGP(DTUN, level, "TUN(%s): " fmt, (tun)->devname, ## args)
diff --git a/lib/tun.c b/lib/tun.c
index c771b92..cb66fef 100644
--- a/lib/tun.c
+++ b/lib/tun.c
@@ -318,7 +318,14 @@
 
 int tun_encaps(struct tun_t *tun, void *pack, unsigned len)
 {
-	return write(tun->fd, pack, len);
+	int rc;
+	rc = write(tun->fd, pack, len);
+	if (rc < 0) {
+		SYS_ERR(DTUN, LOGL_ERROR, errno, "TUN(%s): write() failed", tun->devname);
+	} else if (rc < len) {
+		LOGTUN(LOGL_ERROR, tun, "short write() %d < %u\n", rc, len);
+	}
+	return rc;
 }
 
 int tun_runscript(struct tun_t *tun, char *script)
diff --git a/lib/tun.h b/lib/tun.h
index 07ca04a..36a4f7e 100644
--- a/lib/tun.h
+++ b/lib/tun.h
@@ -59,4 +59,7 @@
 int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list,
 		     size_t prefix_size, int flags);
 
+#define LOGTUN(level, tun, fmt, args...) \
+	LOGP(DTUN, level, "TUN(%s): " fmt, (tun)->devname, ## args)
+
 #endif /* !_TUN_H */

-- 
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Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Change-Id: I5f681b5edcc4cf525629d2078ae0c0ffd7ebb72d
Gerrit-Change-Number: 24494
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newchange
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