--- /dev/null
+/*
+ * Check decoding of preadv2 and pwritev2 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 <sys/syscall.h>
+
+#if defined __NR_preadv2 && defined __NR_pwritev2
+
+# include <errno.h>
+# include <fcntl.h>
+# include <stdio.h>
+# include <sys/uio.h>
+# include <unistd.h>
+
+static int
+pr(const int fd, const struct iovec *const vec,
+ const unsigned long vlen, const unsigned long pos)
+{
+ return syscall(__NR_preadv2, fd, vec, vlen, pos, 0L, 0L);
+}
+
+static int
+pw(const int fd, const struct iovec *const vec,
+ const unsigned long vlen, const unsigned long pos)
+{
+ return syscall(__NR_pwritev2, fd, vec, vlen, pos, 0L, 0L);
+}
+
+static void
+dumpio(void)
+{
+ static char tmp[] = "preadv2-pwritev2-tmpfile";
+ if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
+ perror_msg_and_fail("creat: %s", tmp);
+ if (open(tmp, O_WRONLY) != 1)
+ perror_msg_and_fail("open: %s", tmp);
+ if (unlink(tmp))
+ perror_msg_and_fail("unlink: %s", tmp);
+
+ 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));
+
+ long rc;
+
+ 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)
+ }
+ };
+ const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
+
+ rc = pw(1, w_iov, 0, 0);
+ if (rc)
+ perror_msg_and_fail("pwritev2: expected 0, returned %ld", rc);
+ tprintf("pwritev2(1, [], 0, 0, 0) = 0\n");
+
+ rc = pw(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0);
+ tprintf("pwritev2(1, [{\"%s\", %u}, %p], 2, 0, 0) = %ld %s (%m)\n",
+ w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
+ rc, errno2name());
+
+ const unsigned int w_len =
+ LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
+
+ rc = pw(1, w_iov, ARRAY_SIZE(w_iov_), 0);
+ if (rc != (int) w_len)
+ perror_msg_and_fail("pwritev2: expected %u, returned %ld",
+ w_len, rc);
+ close(1);
+ tprintf("pwritev2(1, [{\"%s\", %u}, {\"%s\", %u}"
+ ", {\"%s\", %u}], %u, 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",
+ w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
+ w2_c, LENGTH_OF(w2_c), ARRAY_SIZE(w_iov_), 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
+ }
+ };
+ const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
+
+ rc = pr(0, r_iov, ARRAY_SIZE(r0_iov_), 0);
+ if (rc != (int) r_len)
+ perror_msg_and_fail("preadv2: expected %u, returned %ld",
+ r_len, rc);
+ tprintf("preadv2(0, [{\"%s\", %u}], %u, 0, 0) = %u\n"
+ " * %u bytes in buffer 0\n"
+ " | 00000 %-49s %-16s |\n",
+ r0_c, r_len, ARRAY_SIZE(r0_iov_), 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_));
+
+ rc = pr(0, r_iov, ARRAY_SIZE(r1_iov_), r_len);
+ if (rc != (int) w_len - r_len)
+ perror_msg_and_fail("preadv2: expected %d, returned %ld",
+ (int) w_len - r_len, rc);
+ tprintf("preadv2(0, [{\"%s\", %u}, {\"\", %u}], %u, %u, 0) = %u\n"
+ " * %u bytes in buffer 0\n"
+ " | 00000 %-49s %-16s |\n",
+ r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_),
+ r_len, w_len - r_len,
+ w_len - r_len, r1_d, r1_c);
+ close(0);
+}
+
+int
+main(void)
+{
+ const unsigned long vlen = (unsigned long) 0xfac1fed2dad3bef4;
+ const unsigned long long pos = 0xfac5fed6dad7bef8;
+ const unsigned long pos_l = (unsigned long) pos;
+ const unsigned long pos_h = (sizeof(long) == sizeof(long long)) ?
+ (unsigned long) 0xbadc0deddeadbeef : 0xfac5fed6UL;
+ int test_dumpio = 1;
+
+ tprintf("%s", "");
+
+ syscall(__NR_preadv2, -1, NULL, vlen, pos_l, pos_h, 1);
+ if (ENOSYS == errno)
+ test_dumpio = 0;
+ tprintf("preadv2(-1, NULL, %lu, %lld, RWF_HIPRI) = -1 %s (%m)\n",
+ vlen, pos, errno2name());
+
+ syscall(__NR_pwritev2, -1, NULL, vlen, pos_l, pos_h, 1);
+ if (ENOSYS == errno)
+ test_dumpio = 0;
+ tprintf("pwritev2(-1, NULL, %lu, %lld, RWF_HIPRI) = -1 %s (%m)\n",
+ vlen, pos, errno2name());
+
+ if (test_dumpio)
+ dumpio();
+
+ tprintf("%s\n", "+++ exited with 0 +++");
+ return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_preadv2 && __NR_pwritev2")
+
+#endif
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