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ntp: add support for recvmmsg()

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This is used to read multiple packets with one system call. It should
work on Linux and NetBSD.
This commit is contained in:
Miroslav Lichvar 2016-08-02 12:17:15 +02:00
parent 895c15d677
commit e306199588
3 changed files with 29 additions and 3 deletions
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14
configure vendored
View file

@ -589,6 +589,20 @@ if test_code 'arc4random_buf()' 'stdlib.h' '' '' 'arc4random_buf(NULL, 0);'; the
add_def HAVE_ARC4RANDOM
fi
RECVMMSG_CODE='
struct mmsghdr hdr;
return !recvmmsg(0, &hdr, 1, MSG_DONTWAIT, 0);'
if test_code 'recvmmsg()' 'sys/socket.h' '' "$EXTRA_LIBS" "$RECVMMSG_CODE"; then
add_def HAVE_RECVMMSG
else
if test_code 'recvmmsg() with _GNU_SOURCE' 'sys/socket.h' '-D_GNU_SOURCE' \
"$EXTRA_LIBS" "$RECVMMSG_CODE"
then
add_def _GNU_SOURCE
add_def HAVE_RECVMMSG
fi
fi
timepps_h=""
if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
if test_code '<sys/timepps.h>' 'sys/timepps.h' '' '' ''; then

14
ntp_io.c
View file

@ -60,12 +60,18 @@ struct Message {
struct cmsghdr cmsgbuf[CMSGBUF_SIZE / sizeof (struct cmsghdr)];
};
#ifdef HAVE_RECVMMSG
#define MAX_RECV_MESSAGES 4
#define MessageHeader mmsghdr
#else
/* Compatible with mmsghdr */
struct MessageHeader {
struct msghdr msg_hdr;
unsigned int msg_len;
};
#define MAX_RECV_MESSAGES 1
#endif
/* Arrays of Message and MessageHeader */
static ARR_Instance recv_messages;
@ -609,7 +615,7 @@ static void
read_from_socket(int sock_fd, int event, void *anything)
{
/* This should only be called when there is something
to read, otherwise it will block */
to read, otherwise it may block */
struct MessageHeader *hdr;
unsigned int i, n;
@ -619,10 +625,16 @@ read_from_socket(int sock_fd, int event, void *anything)
n = ARR_GetSize(recv_headers);
assert(n >= 1);
#ifdef HAVE_RECVMMSG
status = recvmmsg(sock_fd, hdr, n, MSG_DONTWAIT, NULL);
if (status >= 0)
n = status;
#else
n = 1;
status = recvmsg(sock_fd, &hdr[0].msg_hdr, 0);
if (status >= 0)
hdr[0].msg_len = status;
#endif
if (status < 0) {
DEBUG_LOG(LOGF_NtpIO, "Could not receive from fd %d : %s", sock_fd,

4
sys_linux.c
View file

@ -468,8 +468,8 @@ SYS_Linux_EnableSystemCallFilter(int level)
SCMP_SYS(unlink),
/* Socket */
SCMP_SYS(bind), SCMP_SYS(connect), SCMP_SYS(getsockname),
SCMP_SYS(recvfrom), SCMP_SYS(recvmsg), SCMP_SYS(sendmmsg),
SCMP_SYS(sendmsg), SCMP_SYS(sendto),
SCMP_SYS(recvfrom), SCMP_SYS(recvmmsg), SCMP_SYS(recvmsg),
SCMP_SYS(sendmmsg), SCMP_SYS(sendmsg), SCMP_SYS(sendto),
/* TODO: check socketcall arguments */
SCMP_SYS(socketcall),
/* General I/O */