From bb99a35a873c35e80b0b47fe045081022660374d Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 27 Jan 2012 18:57:37 +0100
Subject: [PATCH] log: increase socket buffers for logging by default

---
 src/journal/journal-send.c    |  8 +++++++-
 src/log.c                     |  4 ++++
 src/util.c                    | 36 +++++++++++++++++++++++++++++++++++
 src/util.h                    |  3 +++
 units/syslog.socket           |  1 +
 units/systemd-journald.socket |  1 +
 6 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/journal/journal-send.c b/src/journal/journal-send.c
index 00029fe0b..b5b4fbfa0 100644
--- a/src/journal/journal-send.c
+++ b/src/journal/journal-send.c
@@ -30,6 +30,8 @@
 #include "util.h"
 #include "socket-util.h"
 
+#define SNDBUF_SIZE (8*1024*1024)
+
 /* We open a single fd, and we'll share it with the current process,
  * all its threads, and all its subprocesses. This means we need to
  * initialize it atomically, and need to operate on it atomically
@@ -47,6 +49,8 @@ retry:
         if (fd < 0)
                 return -errno;
 
+        fd_inc_sndbuf(fd, SNDBUF_SIZE);
+
         if (!__sync_bool_compare_and_swap(&fd_plus_one, 0, fd+1)) {
                 close_nointr_nofail(fd);
                 goto retry;
@@ -219,7 +223,7 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
         if (k >= 0)
                 return 0;
 
-        if (errno != EMSGSIZE)
+        if (errno != EMSGSIZE && errno != ENOBUFS)
                 return -errno;
 
         /* Message doesn't fit... Let's dump the data in a temporary
@@ -294,6 +298,8 @@ _public_ int sd_journal_stream_fd(const char *identifier, int priority, int leve
                 return -errno;
         }
 
+        fd_inc_sndbuf(fd, SNDBUF_SIZE);
+
         if (!identifier)
                 identifier = "";
 
diff --git a/src/log.c b/src/log.c
index 0594f7fde..c37ab2264 100644
--- a/src/log.c
+++ b/src/log.c
@@ -33,6 +33,8 @@
 #include "macro.h"
 #include "socket-util.h"
 
+#define SNDBUF_SIZE (8*1024*1024)
+
 static LogTarget log_target = LOG_TARGET_CONSOLE;
 static int log_max_level = LOG_INFO;
 
@@ -127,6 +129,8 @@ static int create_log_socket(int type) {
         if (fd < 0)
                 return -errno;
 
+        fd_inc_sndbuf(fd, SNDBUF_SIZE);
+
         return fd;
 }
 
diff --git a/src/util.c b/src/util.c
index c9ad831c6..5fe22d2e5 100644
--- a/src/util.c
+++ b/src/util.c
@@ -6279,3 +6279,39 @@ void* memdup(const void *p, size_t l) {
         memcpy(r, p, l);
         return r;
 }
+
+int fd_inc_sndbuf(int fd, size_t n) {
+        int r, value;
+        socklen_t l = sizeof(value);
+
+        r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
+        if (r >= 0 &&
+            l == sizeof(value) &&
+            (size_t) value >= n*2)
+                return 0;
+
+        value = (int) n;
+        r = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value));
+        if (r < 0)
+                return -errno;
+
+        return 1;
+}
+
+int fd_inc_rcvbuf(int fd, size_t n) {
+        int r, value;
+        socklen_t l = sizeof(value);
+
+        r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
+        if (r >= 0 &&
+            l == sizeof(value) &&
+            (size_t) value >= n*2)
+                return 0;
+
+        value = (int) n;
+        r = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value));
+        if (r < 0)
+                return -errno;
+
+        return 1;
+}
diff --git a/src/util.h b/src/util.h
index 202d07a85..dcfc16d46 100644
--- a/src/util.h
+++ b/src/util.h
@@ -536,4 +536,7 @@ int rtc_open(int flags);
 
 int is_kernel_thread(pid_t pid);
 
+int fd_inc_sndbuf(int fd, size_t n);
+int fd_inc_rcvbuf(int fd, size_t n);
+
 #endif
diff --git a/units/syslog.socket b/units/syslog.socket
index 657e7913e..1c5485776 100644
--- a/units/syslog.socket
+++ b/units/syslog.socket
@@ -21,6 +21,7 @@ Wants=syslog.target
 ListenDatagram=/run/systemd/journal/syslog
 SocketMode=0666
 PassCredentials=yes
+ReceiveBuffer=8M
 
 # The default syslog implementation should make syslog.service a
 # symlink to itself, so that this socket activates the right actual
diff --git a/units/systemd-journald.socket b/units/systemd-journald.socket
index 1062390ff..c752505d9 100644
--- a/units/systemd-journald.socket
+++ b/units/systemd-journald.socket
@@ -23,3 +23,4 @@ ListenDatagram=/run/systemd/journal/socket
 ListenDatagram=/dev/log
 SocketMode=0666
 PassCredentials=yes
+ReceiveBuffer=8M
-- 
2.30.2