@@ -237,8 +237,8 @@ sysdep_routines += cmsg_nxthdr
CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables
-tests += tst-recvmsg
-tests-time64 += tst-recvmsg-time64
+tests += tst-recvmsg tst-recvmmsg
+tests-time64 += tst-recvmsg-time64 tst-recvmmsg-time64
tests-special += $(objpfx)tst-socket-consts.out
$(objpfx)tst-socket-consts.out: ../sysdeps/unix/sysv/linux/tst-socket-consts.py
new file mode 100644
@@ -0,0 +1 @@
+#include "tst-recvmmsg.c"
new file mode 100644
@@ -0,0 +1,185 @@
+/* Check recvmmsg timestamp support.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <array_length.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/xunistd.h>
+#include <support/xsocket.h>
+#include <sys/mman.h>
+
+/* Some extra space added for ancillary data, it might be used to convert
+ 32-bit timestamp to 64-bit for _TIME_BITS=64 on older kernels. */
+static const int slack[] = { 0, 4, 8, 16, 32, 64 };
+
+static size_t pagesize;
+
+static int
+do_test_send (const struct sockaddr_in *addr, int nmsgs)
+{
+ int s = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+ xconnect (s, (const struct sockaddr *) addr, sizeof (*addr));
+
+ for (int i = 0; i < nmsgs; i++)
+ xsendto (s, &i, sizeof (i), 0, (const struct sockaddr *) addr,
+ sizeof (*addr));
+
+ return 0;
+}
+
+#define NMSGS 5
+
+static void
+do_recvmmsg (int s, bool support_64_timestamp, void *cmsg[], size_t slack,
+ size_t tsize)
+{
+ /* A timestamp is expected if 32-bit timestamp are used (support in every
+ configuration) or if underlying kernel support 64-bit timestamps.
+ Otherwise recvmsg will need extra space do add the 64-bit timestamp. */
+ bool exp_timestamp;
+ if (sizeof (time_t) == 4 || support_64_timestamp)
+ exp_timestamp = true;
+ else
+ exp_timestamp = slack >= CMSG_SPACE (tsize);
+
+ int msg[5];
+ struct iovec iov[NMSGS];
+ for (int i = 0; i < NMSGS; i++)
+ {
+ iov[i].iov_base = &msg[i];
+ iov[i].iov_len = sizeof (msg[i]);
+ }
+ struct mmsghdr msghdr[NMSGS];
+ size_t msgs = CMSG_SPACE (tsize + slack);
+ for (int i = 0; i < NMSGS; i++)
+ {
+ msghdr[i].msg_hdr.msg_name = NULL;
+ msghdr[i].msg_hdr.msg_namelen = 0;
+ msghdr[i].msg_hdr.msg_iov = &iov[i];
+ msghdr[i].msg_hdr.msg_iovlen = 1;
+ msghdr[i].msg_hdr.msg_controllen = msgs,
+ msghdr[i].msg_hdr.msg_control = cmsg[i] != NULL
+ ? cmsg[i] + pagesize - msgs : NULL;
+ }
+
+ TEST_COMPARE (recvmmsg (s, msghdr, NMSGS, 0, NULL), NMSGS);
+ for (int i = 0; i < NMSGS; i++)
+ {
+ if (msghdr[i].msg_len == 0)
+ continue;
+
+ TEST_COMPARE (msg[i], i);
+
+ int timestamp = false;
+ for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msghdr[i].msg_hdr);
+ cmsg != NULL;
+ cmsg = CMSG_NXTHDR (&msghdr[i].msg_hdr, cmsg))
+ {
+ if (cmsg->cmsg_level != SOL_SOCKET)
+ continue;
+ if (cmsg->cmsg_type == SCM_TIMESTAMP
+ && cmsg->cmsg_len == CMSG_LEN (sizeof (struct timeval)))
+ {
+ struct timeval tv;
+ memcpy (&tv, CMSG_DATA (cmsg), sizeof (tv));
+ printf ("SCM_TIMESTAMP: {%jd, %jd}\n", (intmax_t)tv.tv_sec,
+ (intmax_t)tv.tv_usec);
+ timestamp = true;
+ }
+ else if (cmsg->cmsg_type == SCM_TIMESTAMPNS
+ && cmsg->cmsg_len == CMSG_LEN (sizeof (struct timespec)))
+ {
+ struct timespec ts;
+ memcpy (&ts, CMSG_DATA (cmsg), sizeof (ts));
+ printf ("SCM_TIMESTAMPNS: {%jd, %jd}\n", (intmax_t)ts.tv_sec,
+ (intmax_t)ts.tv_nsec);
+ timestamp = true;
+ }
+ }
+
+ /* If there is not timestamp in the ancilliary data, recvmsg should set
+ the flag inidcating it. */
+ if (exp_timestamp && !timestamp)
+ TEST_VERIFY (msghdr[i].msg_hdr.msg_flags & MSG_TRUNC);
+ else
+ TEST_COMPARE (exp_timestamp, timestamp);
+ }
+}
+
+static int
+do_test (void)
+{
+ int srv = xsocket (AF_INET, SOCK_DGRAM, 0);
+ struct sockaddr_in srv_addr =
+ {
+ .sin_family = AF_INET,
+ .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) },
+ };
+ xbind (srv, (struct sockaddr *) &srv_addr, sizeof (srv_addr));
+ {
+ socklen_t sa_len = sizeof (srv_addr);
+ xgetsockname (srv, (struct sockaddr *) &srv_addr, &sa_len);
+ TEST_VERIFY (sa_len == sizeof (srv_addr));
+ }
+
+ TEST_COMPARE (recvmmsg (-1, NULL, 0, 0, NULL), -1);
+ TEST_COMPARE (errno, EBADF);
+
+ /* Setup the ancillary data buffer with an extra page with PROT_NONE to
+ check the possible timestamp conversion on some systems. */
+ pagesize = sysconf (_SC_PAGESIZE);
+ if (pagesize == -1)
+ FAIL_EXIT1 ("sysconf (_SC_PAGESIZE): %m\n");
+ void *msgbuf[NMSGS];
+ for (int i = 0; i < NMSGS; i++)
+ {
+ msgbuf[i] = xmmap (0, 2 * pagesize, PROT_NONE,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1);
+ xmprotect (msgbuf[i], pagesize, PROT_READ | PROT_WRITE);
+ }
+
+ /* If underlying kernel does not support */
+ bool support_64_timestamp = support_socket_time64_timestamp (srv);
+
+ /* Enable the timestamp using struct timeval precision. */
+ xsetsockopt (srv, SOL_SOCKET, SO_TIMESTAMP, &(int){1}, sizeof (int));
+ for (int s = 0; s < array_length (slack); s++)
+ {
+ do_test_send (&srv_addr, NMSGS);
+ do_recvmmsg (srv, support_64_timestamp, msgbuf, slack[s],
+ sizeof (struct timeval));
+ }
+
+ /* Now enable timestamp using a higher precision, it overwrites the previous
+ precision. */
+ xsetsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS, &(int){1}, sizeof (int));
+ for (int s = 0; s < array_length (slack); s++)
+ {
+ do_test_send (&srv_addr, NMSGS);
+ do_recvmmsg (srv, support_64_timestamp, msgbuf, slack[s],
+ sizeof (struct timespec));
+ }
+
+ return 0;
+}
+
+#include <support/test-driver.c>