1 /* 2 * Check decoding of preadv and pwritev 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 #if defined HAVE_PREADV && defined HAVE_PWRITEV 34 35 # include <fcntl.h> 36 # include <stdio.h> 37 # include <sys/uio.h> 38 # include <unistd.h> 39 40 int 41 main(void) 42 { 43 tprintf("%s", ""); 44 45 static char tmp[] = "preadv-pwritev-tmpfile"; 46 if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0) 47 perror_msg_and_fail("creat: %s", tmp); 48 if (open(tmp, O_WRONLY) != 1) 49 perror_msg_and_fail("open: %s", tmp); 50 if (unlink(tmp)) 51 perror_msg_and_fail("unlink: %s", tmp); 52 53 static const char w0_c[] = "012"; 54 const char *w0_d = hexdump_strdup(w0_c); 55 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c)); 56 57 const void *efault = w0 + LENGTH_OF(w0_c); 58 59 static const char w1_c[] = "34567"; 60 const char *w1_d = hexdump_strdup(w1_c); 61 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c)); 62 63 static const char w2_c[] = "89abcde"; 64 const char *w2_d = hexdump_strdup(w2_c); 65 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c)); 66 67 long rc; 68 69 rc = pwritev(1, efault, 42, 0); 70 tprintf("pwritev(1, %p, 42, 0) = %ld %s (%m)\n", 71 efault, rc, errno2name()); 72 73 rc = preadv(0, efault, 42, 0); 74 tprintf("preadv(0, %p, 42, 0) = %ld %s (%m)\n", 75 efault, rc, errno2name()); 76 77 static const char r0_c[] = "01234567"; 78 const char *r0_d = hexdump_strdup(r0_c); 79 static const char r1_c[] = "89abcde"; 80 const char *r1_d = hexdump_strdup(r1_c); 81 82 const struct iovec w_iov_[] = { 83 { 84 .iov_base = w0, 85 .iov_len = LENGTH_OF(w0_c) 86 }, { 87 .iov_base = w1, 88 .iov_len = LENGTH_OF(w1_c) 89 }, { 90 .iov_base = w2, 91 .iov_len = LENGTH_OF(w2_c) 92 } 93 }; 94 const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_)); 95 96 rc = pwritev(1, w_iov, 0, 0); 97 if (rc) 98 perror_msg_and_fail("pwritev: expected 0, returned %ld", rc); 99 tprintf("pwritev(1, [], 0, 0) = 0\n"); 100 101 rc = pwritev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0); 102 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}, %p], 2, 0)" 103 " = %ld %s (%m)\n", 104 w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_), 105 rc, errno2name()); 106 107 const unsigned int w_len = 108 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c); 109 110 rc = pwritev(1, w_iov, ARRAY_SIZE(w_iov_), 0); 111 if (rc != (int) w_len) 112 perror_msg_and_fail("pwritev: expected %u, returned %ld", 113 w_len, rc); 114 close(1); 115 tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}" 116 ", {iov_base=\"%s\", iov_len=%u}" 117 ", {iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n" 118 " * %u bytes in buffer 0\n" 119 " | 00000 %-49s %-16s |\n" 120 " * %u bytes in buffer 1\n" 121 " | 00000 %-49s %-16s |\n" 122 " * %u bytes in buffer 2\n" 123 " | 00000 %-49s %-16s |\n", 124 w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c), 125 w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len, 126 LENGTH_OF(w0_c), w0_d, w0_c, 127 LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c); 128 129 const unsigned int r_len = (w_len + 1) / 2; 130 void *r0 = tail_alloc(r_len); 131 const struct iovec r0_iov_[] = { 132 { 133 .iov_base = r0, 134 .iov_len = r_len 135 } 136 }; 137 const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_)); 138 139 rc = preadv(0, r_iov, ARRAY_SIZE(r0_iov_), 0); 140 if (rc != (int) r_len) 141 perror_msg_and_fail("preadv: expected %u, returned %ld", 142 r_len, rc); 143 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n" 144 " * %u bytes in buffer 0\n" 145 " | 00000 %-49s %-16s |\n", 146 r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_), 147 r_len, r_len, r0_d, r0_c); 148 149 void *r1 = tail_alloc(r_len); 150 void *r2 = tail_alloc(w_len); 151 const struct iovec r1_iov_[] = { 152 { 153 .iov_base = r1, 154 .iov_len = r_len 155 }, 156 { 157 .iov_base = r2, 158 .iov_len = w_len 159 } 160 }; 161 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_)); 162 163 rc = preadv(0, r_iov, ARRAY_SIZE(r1_iov_), r_len); 164 if (rc != (int) w_len - (int) r_len) 165 perror_msg_and_fail("preadv: expected %d, returned %ld", 166 (int) w_len - r_len, rc); 167 tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}" 168 ", {iov_base=\"\", iov_len=%u}], %u, %u) = %u\n" 169 " * %u bytes in buffer 0\n" 170 " | 00000 %-49s %-16s |\n", 171 r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_), 172 r_len, w_len - r_len, 173 w_len - r_len, r1_d, r1_c); 174 close(0); 175 176 tprintf("+++ exited with 0 +++\n"); 177 return 0; 178 } 179 180 #else 181 182 SKIP_MAIN_UNDEFINED("HAVE_PREADV && HAVE_PWRITEV") 183 184 #endif 185
