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