--- /dev/null
+/*
+ * Check decoding of recvmsg and sendmsg syscalls.
+ *
+ * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+int
+main(void)
+{
+ tprintf("%s", "");
+
+ int fds[2];
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
+ perror_msg_and_skip("socketpair");
+ assert(0 == fds[0]);
+ assert(1 == fds[1]);
+
+ static const char w0_c[] = "012";
+ const char *w0_d = hexdump_strdup(w0_c);
+ void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
+
+ static const char w1_c[] = "34567";
+ const char *w1_d = hexdump_strdup(w1_c);
+ void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
+
+ static const char w2_c[] = "89abcde";
+ const char *w2_d = hexdump_strdup(w2_c);
+ void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
+
+ static const char r0_c[] = "01234567";
+ const char *r0_d = hexdump_strdup(r0_c);
+ static const char r1_c[] = "89abcde";
+ const char *r1_d = hexdump_strdup(r1_c);
+
+ const struct iovec w_iov_[] = {
+ {
+ .iov_base = w0,
+ .iov_len = LENGTH_OF(w0_c)
+ }, {
+ .iov_base = w1,
+ .iov_len = LENGTH_OF(w1_c)
+ }, {
+ .iov_base = w2,
+ .iov_len = LENGTH_OF(w2_c)
+ }
+ };
+ struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
+ const unsigned int w_len =
+ LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
+
+ const struct msghdr w_mh_ = {
+ .msg_iov = w_iov,
+ .msg_iovlen = ARRAY_SIZE(w_iov_)
+ };
+ const struct msghdr *w_mh = tail_memdup(&w_mh_, sizeof(w_mh_));
+
+ assert(sendmsg(1, w_mh, 0) == (int) w_len);
+ close(1);
+ tprintf("sendmsg(1, {msg_name(0)=NULL, msg_iov(%u)="
+ "[{\"%s\", %u}, {\"%s\", %u}, {\"%s\", %u}]"
+ ", msg_controllen=0, msg_flags=0}, 0) = %u\n"
+ " * %u bytes in buffer 0\n"
+ " | 00000 %-49s %-16s |\n"
+ " * %u bytes in buffer 1\n"
+ " | 00000 %-49s %-16s |\n"
+ " * %u bytes in buffer 2\n"
+ " | 00000 %-49s %-16s |\n",
+ ARRAY_SIZE(w_iov_), w0_c, LENGTH_OF(w0_c),
+ w1_c, LENGTH_OF(w1_c), w2_c, LENGTH_OF(w2_c), w_len,
+ LENGTH_OF(w0_c), w0_d, w0_c, LENGTH_OF(w1_c), w1_d, w1_c,
+ LENGTH_OF(w2_c), w2_d, w2_c);
+
+ const unsigned int r_len = (w_len + 1) / 2;
+ void *r0 = tail_alloc(r_len);
+ const struct iovec r0_iov_[] = {
+ {
+ .iov_base = r0,
+ .iov_len = r_len
+ }
+ };
+ struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
+
+ const struct msghdr r_mh_ = {
+ .msg_iov = r_iov,
+ .msg_iovlen = ARRAY_SIZE(r0_iov_)
+ };
+ struct msghdr *r_mh = tail_memdup(&r_mh_, sizeof(r_mh_));
+
+ assert(recvmsg(0, r_mh, 0) == (int) r_len);
+ tprintf("recvmsg(0, {msg_name(0)=NULL, msg_iov(%u)="
+ "[{\"%s\", %u}], msg_controllen=0, msg_flags=0}, 0) = %u\n"
+ " * %u bytes in buffer 0\n"
+ " | 00000 %-49s %-16s |\n",
+ ARRAY_SIZE(r0_iov_), r0_c, r_len, r_len, r_len, r0_d, r0_c);
+
+ void *r1 = tail_alloc(r_len);
+ void *r2 = tail_alloc(w_len);
+ const struct iovec r1_iov_[] = {
+ {
+ .iov_base = r1,
+ .iov_len = r_len
+ },
+ {
+ .iov_base = r2,
+ .iov_len = w_len
+ }
+ };
+ r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
+ r_mh->msg_iov = r_iov;
+ r_mh->msg_iovlen = ARRAY_SIZE(r1_iov_);
+
+ assert(recvmsg(0, r_mh, 0) == (int) w_len - r_len);
+ tprintf("recvmsg(0, {msg_name(0)=NULL, msg_iov(%u)="
+ "[{\"%s\", %u}, {\"\", %u}], msg_controllen=0"
+ ", msg_flags=0}, 0) = %u\n"
+ " * %u bytes in buffer 0\n"
+ " | 00000 %-49s %-16s |\n",
+ ARRAY_SIZE(r1_iov_), r1_c, r_len, w_len, w_len - r_len,
+ w_len - r_len, r1_d, r1_c);
+ close(0);
+
+ tprintf("+++ exited with 0 +++\n");
+ return 0;
+}
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