1d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes/* 2d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Check decoding of readv and writev syscalls. 3d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 4d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 577c3ff8e0644f1e120e4b2ebc7222150b0446f3bElliott Hughes * Copyright (c) 2016-2017 The strace developers. 6d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * All rights reserved. 7d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 8d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * Redistribution and use in source and binary forms, with or without 9d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * modification, are permitted provided that the following conditions 10d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * are met: 11d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 1. Redistributions of source code must retain the above copyright 12d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * notice, this list of conditions and the following disclaimer. 13d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 2. Redistributions in binary form must reproduce the above copyright 14d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * notice, this list of conditions and the following disclaimer in the 15d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * documentation and/or other materials provided with the distribution. 16d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 3. The name of the author may not be used to endorse or promote products 17d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * derived from this software without specific prior written permission. 18d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * 19d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes */ 30d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 31d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include "tests.h" 32d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 33d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <assert.h> 34d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <stdio.h> 35d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <unistd.h> 36d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes#include <sys/uio.h> 37d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 38d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesint 39d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughesmain(void) 40d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes{ 41d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("%s", ""); 42d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 43d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes int fds[2]; 44d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes pipe_maxfd(fds); 45d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 46d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char w0_c[] = "012"; 47d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const char *w0_d = hexdump_strdup(w0_c); 48d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c)); 49d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 50d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const void *efault = w0 + LENGTH_OF(w0_c); 51d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 52d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char w1_c[] = "34567"; 53d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const char *w1_d = hexdump_strdup(w1_c); 54d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c)); 55d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 56d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char w2_c[] = "89abcde"; 57d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const char *w2_d = hexdump_strdup(w2_c); 58d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c)); 59d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes long rc; 60d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 61d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = writev(fds[1], efault, 42); 62d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("writev(%d, %p, 42) = %ld %s (%m)\n", 63d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fds[1], efault, rc, errno2name()); 64d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 65d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = readv(fds[0], efault, 42); 66d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("readv(%d, %p, 42) = %ld %s (%m)\n", 67d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fds[0], efault, rc, errno2name()); 68d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 69d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char r0_c[] = "01234567"; 70d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const char *r0_d = hexdump_strdup(r0_c); 71d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes static const char r1_c[] = "89abcde"; 72d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const char *r1_d = hexdump_strdup(r1_c); 73d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 74d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct iovec w_iov_[] = { 75d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes { 76d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = w0, 77d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = LENGTH_OF(w0_c) 78d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }, { 79d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = w1, 80d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = LENGTH_OF(w1_c) 81d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }, { 82d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = w2, 83d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = LENGTH_OF(w2_c) 84d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 85d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }; 86d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_)); 87d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 88d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("writev(%d, [], 0) = %ld\n", 89d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fds[1], (long) writev(fds[1], w_iov, 0)); 90d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 91d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc = writev(fds[1], w_iov + ARRAY_SIZE(w_iov_) - 1, 2); 92d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}, %p], 2)" 93d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " = %ld %s (%m)\n", 94d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fds[1], w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_), 95d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes rc, errno2name()); 96d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 97d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const unsigned int w_len = 98d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c); 99d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 100d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes assert(writev(fds[1], w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len); 101d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes close(fds[1]); 102d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}" 103d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes ", {iov_base=\"%s\", iov_len=%u}" 104d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes ", {iov_base=\"%s\", iov_len=%u}], %u) = %u\n" 105d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " * %u bytes in buffer 0\n" 106d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " | 00000 %-49s %-16s |\n" 107d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " * %u bytes in buffer 1\n" 108d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " | 00000 %-49s %-16s |\n" 109d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " * %u bytes in buffer 2\n" 110d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " | 00000 %-49s %-16s |\n", 111d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes fds[1], w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c), 112dc75b01004a0588c1eb3bc26d7248a6e473b2cddElliott Hughes w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len, 113d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes LENGTH_OF(w0_c), w0_d, w0_c, 114d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c); 115d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 116d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const unsigned int r_len = (w_len + 1) / 2; 117d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *r0 = tail_alloc(r_len); 118d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct iovec r0_iov_[] = { 119d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes { 120d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = r0, 121d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = r_len 122d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 123d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }; 124d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_)); 125d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 126d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes assert(readv(fds[0], r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len); 127d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}], %u) = %u\n" 128d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " * %u bytes in buffer 0\n" 129d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " | 00000 %-49s %-16s |\n", 130dc75b01004a0588c1eb3bc26d7248a6e473b2cddElliott Hughes fds[0], r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_), 131dc75b01004a0588c1eb3bc26d7248a6e473b2cddElliott Hughes r_len, r_len, r0_d, r0_c); 132d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 133d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *r1 = tail_alloc(r_len); 134d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes void *r2 = tail_alloc(w_len); 135d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes const struct iovec r1_iov_[] = { 136d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes { 137d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = r1, 138d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = r_len 139d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }, 140d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes { 141d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_base = r2, 142d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes .iov_len = w_len 143d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes } 144d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes }; 145d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_)); 146d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 147d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes assert(readv(fds[0], r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - (int) r_len); 148d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}" 149d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes ", {iov_base=\"\", iov_len=%u}], %u) = %u\n" 150d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " * %u bytes in buffer 0\n" 151d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes " | 00000 %-49s %-16s |\n", 152dc75b01004a0588c1eb3bc26d7248a6e473b2cddElliott Hughes fds[0], r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_), 153dc75b01004a0588c1eb3bc26d7248a6e473b2cddElliott Hughes w_len - r_len, w_len - r_len, r1_d, r1_c); 154d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes close(fds[0]); 155d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes 156d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes tprintf("+++ exited with 0 +++\n"); 157d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes return 0; 158d35df493b4e7684c50d2d2fa032ee3a7ac228009Elliott Hughes} 159