1 /* 2 * Check decoding of readv and writev syscalls. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * Copyright (c) 2016-2017 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "tests.h" 32 33 #include <assert.h> 34 #include <stdio.h> 35 #include <unistd.h> 36 #include <sys/uio.h> 37 38 int 39 main(void) 40 { 41 tprintf("%s", ""); 42 43 int fds[2]; 44 pipe_maxfd(fds); 45 46 static const char w0_c[] = "012"; 47 const char *w0_d = hexdump_strdup(w0_c); 48 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c)); 49 50 const void *efault = w0 + LENGTH_OF(w0_c); 51 52 static const char w1_c[] = "34567"; 53 const char *w1_d = hexdump_strdup(w1_c); 54 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c)); 55 56 static const char w2_c[] = "89abcde"; 57 const char *w2_d = hexdump_strdup(w2_c); 58 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c)); 59 long rc; 60 61 rc = writev(fds[1], efault, 42); 62 tprintf("writev(%d, %p, 42) = %ld %s (%m)\n", 63 fds[1], efault, rc, errno2name()); 64 65 rc = readv(fds[0], efault, 42); 66 tprintf("readv(%d, %p, 42) = %ld %s (%m)\n", 67 fds[0], efault, rc, errno2name()); 68 69 static const char r0_c[] = "01234567"; 70 const char *r0_d = hexdump_strdup(r0_c); 71 static const char r1_c[] = "89abcde"; 72 const char *r1_d = hexdump_strdup(r1_c); 73 74 const struct iovec w_iov_[] = { 75 { 76 .iov_base = w0, 77 .iov_len = LENGTH_OF(w0_c) 78 }, { 79 .iov_base = w1, 80 .iov_len = LENGTH_OF(w1_c) 81 }, { 82 .iov_base = w2, 83 .iov_len = LENGTH_OF(w2_c) 84 } 85 }; 86 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_)); 87 88 tprintf("writev(%d, [], 0) = %ld\n", 89 fds[1], (long) writev(fds[1], w_iov, 0)); 90 91 rc = writev(fds[1], w_iov + ARRAY_SIZE(w_iov_) - 1, 2); 92 tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}, %p], 2)" 93 " = %ld %s (%m)\n", 94 fds[1], w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_), 95 rc, errno2name()); 96 97 const unsigned int w_len = 98 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c); 99 100 assert(writev(fds[1], w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len); 101 close(fds[1]); 102 tprintf("writev(%d, [{iov_base=\"%s\", iov_len=%u}" 103 ", {iov_base=\"%s\", iov_len=%u}" 104 ", {iov_base=\"%s\", iov_len=%u}], %u) = %u\n" 105 " * %u bytes in buffer 0\n" 106 " | 00000 %-49s %-16s |\n" 107 " * %u bytes in buffer 1\n" 108 " | 00000 %-49s %-16s |\n" 109 " * %u bytes in buffer 2\n" 110 " | 00000 %-49s %-16s |\n", 111 fds[1], w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c), 112 w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len, 113 LENGTH_OF(w0_c), w0_d, w0_c, 114 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c); 115 116 const unsigned int r_len = (w_len + 1) / 2; 117 void *r0 = tail_alloc(r_len); 118 const struct iovec r0_iov_[] = { 119 { 120 .iov_base = r0, 121 .iov_len = r_len 122 } 123 }; 124 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_)); 125 126 assert(readv(fds[0], r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len); 127 tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}], %u) = %u\n" 128 " * %u bytes in buffer 0\n" 129 " | 00000 %-49s %-16s |\n", 130 fds[0], r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_), 131 r_len, r_len, r0_d, r0_c); 132 133 void *r1 = tail_alloc(r_len); 134 void *r2 = tail_alloc(w_len); 135 const struct iovec r1_iov_[] = { 136 { 137 .iov_base = r1, 138 .iov_len = r_len 139 }, 140 { 141 .iov_base = r2, 142 .iov_len = w_len 143 } 144 }; 145 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_)); 146 147 assert(readv(fds[0], r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - (int) r_len); 148 tprintf("readv(%d, [{iov_base=\"%s\", iov_len=%u}" 149 ", {iov_base=\"\", iov_len=%u}], %u) = %u\n" 150 " * %u bytes in buffer 0\n" 151 " | 00000 %-49s %-16s |\n", 152 fds[0], r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_), 153 w_len - r_len, w_len - r_len, r1_d, r1_c); 154 close(fds[0]); 155 156 tprintf("+++ exited with 0 +++\n"); 157 return 0; 158 } 159
