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      1 /*
      2  * Copyright (c) 2014-2016 Dmitry V. Levin <ldv (at) altlinux.org>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "tests.h"
     29 
     30 #ifdef HAVE_PWRITEV
     31 
     32 # include <fcntl.h>
     33 # include <stdio.h>
     34 # include <sys/uio.h>
     35 # include <unistd.h>
     36 
     37 # define LEN 8
     38 # define LIM (LEN - 1)
     39 
     40 static void
     41 print_iov(const struct iovec *iov)
     42 {
     43 	unsigned int i;
     44 	unsigned char *buf = iov->iov_base;
     45 
     46 	fputs("{iov_base=\"", stdout);
     47 	for (i = 0; i < iov->iov_len; ++i) {
     48 		if (i < LIM)
     49 			printf("\\%d", (int) buf[i]);
     50 	}
     51 	printf("\"%s, iov_len=%u}",
     52 	       i > LIM ? "..." : "", (unsigned) iov->iov_len);
     53 }
     54 
     55 static void
     56 print_iovec(const struct iovec *iov, unsigned int cnt, unsigned int size)
     57 {
     58 	if (!size) {
     59 		printf("%p", iov);
     60 		return;
     61 	}
     62 	unsigned int i;
     63 	putchar('[');
     64 	for (i = 0; i < cnt; ++i) {
     65 		if (i)
     66 			fputs(", ", stdout);
     67 		if (i == size) {
     68 			printf("%p", &iov[i]);
     69 			break;
     70 		}
     71 		if (i == LIM) {
     72 			fputs("...", stdout);
     73 			break;
     74 		}
     75 		print_iov(&iov[i]);
     76 	}
     77 	putchar(']');
     78 }
     79 
     80 int
     81 main(void)
     82 {
     83 	(void) close(0);
     84 	if (open("/dev/null", O_WRONLY))
     85 		perror_msg_and_fail("open");
     86 
     87 	char *buf = tail_alloc(LEN);
     88 	unsigned i;
     89 	for (i = 0; i < LEN; ++i)
     90 		buf[i] = i;
     91 
     92 	struct iovec *iov = tail_alloc(sizeof(*iov) * LEN);
     93 	for (i = 0; i < LEN; ++i) {
     94 		buf[i] = i;
     95 		iov[i].iov_base = &buf[i];
     96 		iov[i].iov_len = LEN - i;
     97 	}
     98 
     99 	const off_t offset = 0xdefaceddeadbeefLL;
    100 	long rc;
    101 	int written = 0;
    102 	for (i = 0; i < LEN; ++i) {
    103 		written += iov[i].iov_len;
    104 		if (pwritev(0, iov, i + 1, offset + i) != written)
    105 			perror_msg_and_fail("pwritev");
    106 		fputs("pwritev(0, ", stdout);
    107 		print_iovec(iov, i + 1, LEN);
    108 		printf(", %u, %lld) = %d\n",
    109 		       i + 1, (long long) offset + i, written);
    110 	}
    111 
    112 	for (i = 0; i <= LEN; ++i) {
    113 		unsigned int n = LEN + 1 - i;
    114 		fputs("pwritev(0, ", stdout);
    115 		print_iovec(iov + i, n, LEN - i);
    116 		rc = pwritev(0, iov + i, n, offset + LEN + i);
    117 		printf(", %u, %lld) = %ld %s (%m)\n",
    118 		       n, (long long) offset + LEN + i, rc, errno2name());
    119 	}
    120 
    121 	iov->iov_base = iov + LEN * 2;
    122 	rc = pwritev(0, iov, 1, -1);
    123 	printf("pwritev(0, [{iov_base=%p, iov_len=%d}], 1, -1) = %ld %s (%m)\n",
    124 	       iov->iov_base, LEN, rc, errno2name());
    125 
    126 	iov += LEN;
    127 	rc = pwritev(0, iov, 42, -2);
    128 	printf("pwritev(0, %p, 42, -2) = %ld %s (%m)\n",
    129 	       iov, rc, errno2name());
    130 
    131 	rc = pwritev(0, NULL, 1, -3);
    132 	printf("pwritev(0, NULL, 1, -3) = %ld %s (%m)\n",
    133 	       rc, errno2name());
    134 
    135 	rc = pwritev(0, iov, 0, -4);
    136 	printf("pwritev(0, [], 0, -4) = %ld %s (%m)\n",
    137 	       rc, errno2name());
    138 
    139 	puts("+++ exited with 0 +++");
    140 	return 0;
    141 }
    142 
    143 #else
    144 
    145 SKIP_MAIN_UNDEFINED("HAVE_PWRITEV")
    146 
    147 #endif
    148