pespin has uploaded this change for review.

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gsmtap_util: Set source_fd RCVBUF to minimum

We never expect to receive anything on this socket, so set its RCVBUF to
the minimum possible to save some memory.

Change-Id: If82b3edf11dea1a124035d4eb0e6aa44f4223555
---
M src/core/gsmtap_util.c
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/15/41715/1

diff --git a/src/core/gsmtap_util.c b/src/core/gsmtap_util.c
index 3fab7ac..0a920e3 100644
--- a/src/core/gsmtap_util.c
+++ b/src/core/gsmtap_util.c
@@ -501,6 +501,7 @@
 {
 	struct gsmtap_inst *gti;
 	int fd;
+	int buflen;
 
 	fd = gsmtap_source_init_fd2(local_host, local_port, rem_host, rem_port);
 	if (fd < 0)
@@ -522,6 +523,11 @@
 		osmo_iofd_set_txqueue_max_length(gti->out, 1024);
 	}
 
+	/* We never read from this socket, so tell the kernel
+	 * to set the RCVBUF to the minimum possible value */
+	buflen = 0;
+	setsockopt(gti->source_fd, SOL_SOCKET, SO_RCVBUF, &buflen, sizeof(buflen));
+
 	return gti;
 
 err_cleanup:

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