From 095353ff1a4f611922dfc4c98b0c4bd55d9f6d4f Mon Sep 17 00:00:00 2001 From: Mark Kettenis Date: Sat, 23 Jan 2016 17:29:32 +0100 Subject: [PATCH] Increase unix socket send buffer to at least 64KB Some systems (e.g. OpenBSD) have a rather small default socket send buffer size of 4KB. The result is that sending requests with a largish payload requires serveral writev(2) system calls. Make sure the socket send buffer is at least 64KB such that we're likely to succeed with a single system call for most requests. A similar change was made to the xtrans code some time ago. Signed-off-by: Mark Kettenis Reviewed-by: Matthieu Herrb --- src/xcb_util.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/xcb_util.c b/src/xcb_util.c index ba0f108..a3357ef 100644 --- a/src/xcb_util.c +++ b/src/xcb_util.c @@ -428,6 +428,8 @@ static int _xcb_open_unix(char *protocol, const char *file) { int fd; struct sockaddr_un addr; + socklen_t len = sizeof(int); + int val; if (protocol && strcmp("unix",protocol)) return -1; @@ -440,6 +442,11 @@ static int _xcb_open_unix(char *protocol, const char *file) fd = _xcb_socket(AF_UNIX, SOCK_STREAM, 0); if(fd == -1) return -1; + if(getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0 && val < 64 * 1024) + { + val = 64 * 1024; + setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int)); + } if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) { close(fd); return -1;