149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/*
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* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2018 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#ifdef HAVE_PWRITEV
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# include <fcntl.h>
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# include <stdio.h>
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# include <sys/uio.h>
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# include <unistd.h>
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# define LEN 8
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# define LIM (LEN - 1)
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static void
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print_iov(const struct iovec *iov)
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{
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unsigned int i;
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unsigned char *buf = iov->iov_base;
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fputs("{iov_base=\"", stdout);
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for (i = 0; i < iov->iov_len; ++i) {
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if (i < LIM)
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printf("\\%d", (int) buf[i]);
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}
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printf("\"%s, iov_len=%u}",
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i > LIM ? "..." : "", (unsigned) iov->iov_len);
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}
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static void
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print_iovec(const struct iovec *iov, unsigned int cnt, unsigned int size)
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{
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if (!size) {
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printf("%p", iov);
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return;
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}
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unsigned int i;
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putchar('[');
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for (i = 0; i < cnt; ++i) {
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if (i)
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fputs(", ", stdout);
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if (i == size) {
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printf("... /* %p */", &iov[i]);
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break;
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}
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if (i == LIM) {
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fputs("...", stdout);
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break;
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}
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print_iov(&iov[i]);
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}
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putchar(']');
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}
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int
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main(void)
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{
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(void) close(0);
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if (open("/dev/null", O_WRONLY))
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perror_msg_and_fail("open");
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char *buf = tail_alloc(LEN);
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unsigned i;
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for (i = 0; i < LEN; ++i)
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buf[i] = i;
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struct iovec *iov = tail_alloc(sizeof(*iov) * LEN);
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for (i = 0; i < LEN; ++i) {
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buf[i] = i;
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iov[i].iov_base = &buf[i];
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iov[i].iov_len = LEN - i;
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}
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const off_t offset = 0xdefaceddeadbeefLL;
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long rc;
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int written = 0;
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for (i = 0; i < LEN; ++i) {
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written += iov[i].iov_len;
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if (pwritev(0, iov, i + 1, offset + i) != written)
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perror_msg_and_fail("pwritev");
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fputs("pwritev(0, ", stdout);
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print_iovec(iov, i + 1, LEN);
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printf(", %u, %lld) = %d\n",
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i + 1, (long long) offset + i, written);
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}
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for (i = 0; i <= LEN; ++i) {
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unsigned int n = LEN + 1 - i;
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fputs("pwritev(0, ", stdout);
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print_iovec(iov + i, n, LEN - i);
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rc = pwritev(0, iov + i, n, offset + LEN + i);
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printf(", %u, %lld) = %ld %s (%m)\n",
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n, (long long) offset + LEN + i, rc, errno2name());
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}
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iov->iov_base = iov + LEN * 2;
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rc = pwritev(0, iov, 1, -1);
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printf("pwritev(0, [{iov_base=%p, iov_len=%d}], 1, -1) = %ld %s (%m)\n",
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iov->iov_base, LEN, rc, errno2name());
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iov += LEN;
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rc = pwritev(0, iov, 42, -2);
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printf("pwritev(0, %p, 42, -2) = %ld %s (%m)\n",
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iov, rc, errno2name());
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rc = pwritev(0, NULL, 1, -3);
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printf("pwritev(0, NULL, 1, -3) = %ld %s (%m)\n",
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rc, errno2name());
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rc = pwritev(0, iov, 0, -4);
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printf("pwritev(0, [], 0, -4) = %ld %s (%m)\n",
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rc, errno2name());
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puts("+++ exited with 0 +++");
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return 0;
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}
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#else
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SKIP_MAIN_UNDEFINED("HAVE_PWRITEV")
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#endif
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