1 /*- 2 * Copyright (c) 2006 Robert N. M. Watson 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * Very simple regression test. 29 * 30 * Future tests that might be of interest: 31 * 32 * - Make sure we get EISDIR on a directory. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/event.h> 37 #include <sys/socket.h> 38 #include <sys/stat.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <inttypes.h> 44 #include <limits.h> 45 #include <stdio.h> 46 #include <unistd.h> 47 48 /* 49 * Select various potentially interesting lengths at and around power of 2 50 * edges. 51 */ 52 static off_t lengths[] = {0, 1, 2, 3, 4, 127, 128, 129, 511, 512, 513, 1023, 53 1024, 1025, 2047, 2048, 2049, 4095, 4096, 4097, 8191, 8192, 8193, 16383, 54 16384, 16385}; 55 static int lengths_count = sizeof(lengths) / sizeof(off_t); 56 57 int 58 main(void) 59 { 60 int error, fd, fds[2], i, read_only_fd; 61 char path[] = "ftruncate_file"; 62 struct stat sb; 63 ssize_t size; 64 off_t len; 65 char ch; 66 67 /* 68 * Tests using a writable file: grow and then shrink a file 69 * using ftruncate and various lengths. Make sure that a negative 70 * file length is rejected. Make sure that when we grow the file, 71 * bytes now in the range of the file size return 0. 72 * 73 * Save a read-only reference to the file to use later for read-only 74 * descriptor tests. 75 */ 76 fd = open(path, O_RDWR|O_CREAT, 0600); 77 if (fd < 0) 78 err(1, "open(%s, O_RDWR|O_CREAT, 0600)", path); 79 read_only_fd = open(path, O_RDONLY); 80 if (read_only_fd < 0) { 81 error = errno; 82 (void)unlink(path); 83 errno = error; 84 err(1, "open(%s, O_RDONLY)", path); 85 } 86 (void)unlink(path); 87 88 if (ftruncate(fd, -1) == 0) 89 errx(1, "ftruncate(fd, -1) succeeded unexpectedly"); 90 if (errno != EINVAL) 91 err(1, "ftruncate(fd, -1) returned wrong error"); 92 93 for (i = 0; i < lengths_count; i++) { 94 len = lengths[i]; 95 if (ftruncate(fd, len) < 0) 96 err(1, "ftruncate(%jd) up", (intmax_t)len); 97 if (fstat(fd, &sb) < 0) 98 err(1, "stat"); 99 if (sb.st_size != len) 100 errx(-1, "fstat with len=%jd returned len %jd up", 101 (intmax_t)len, (intmax_t)sb.st_size); 102 if (len != 0) { 103 size = pread(fd, &ch, sizeof(ch), len - 1); 104 if (size < 0) 105 err(1, "pread on len %jd up", (intmax_t)len); 106 if (size != sizeof(ch)) 107 errx(-1, "pread len %jd size %jd up", 108 (intmax_t)len, (intmax_t)size); 109 if (ch != 0) 110 errx(-1, 111 "pread length %jd size %jd ch %d up", 112 (intmax_t)len, (intmax_t)size, ch); 113 } 114 } 115 116 for (i = lengths_count - 1; i >= 0; i--) { 117 len = lengths[i]; 118 if (ftruncate(fd, len) < 0) 119 err(1, "ftruncate(%jd) down", (intmax_t)len); 120 if (fstat(fd, &sb) < 0) 121 err(1, "stat"); 122 if (sb.st_size != len) 123 errx(-1, "fstat(%jd) returned %jd down", (intmax_t)len, 124 sb.st_size); 125 } 126 close(fd); 127 128 /* 129 * Make sure that a read-only descriptor can't be truncated. 130 */ 131 if (ftruncate(read_only_fd, 0) == 0) 132 errx(-1, "ftruncate(read_only_fd) succeeded"); 133 if (errno != EINVAL) 134 err(1, "ftruncate(read_only_fd) returned wrong error"); 135 close(read_only_fd); 136 137 /* 138 * Make sure that ftruncate on sockets doesn't work. 139 */ 140 fd = socket(PF_UNIX, SOCK_STREAM, 0); 141 if (fd < 0) 142 err(1, "socket(PF_UNIX, SOCK_STREAM, 0)"); 143 if (ftruncate(fd, 0) == 0) 144 errx(-1, "ftruncate(socket) succeeded"); 145 if (errno != EINVAL) 146 err(1, "ftruncate(socket) returned wrong error"); 147 close(fd); 148 149 /* 150 * Make sure that ftruncate on pipes doesn't work. 151 */ 152 if (pipe(fds) < 0) 153 err(1, "pipe"); 154 if (ftruncate(fds[0], 0) == 0) 155 errx(-1, "ftruncate(pipe) succeeded"); 156 if (errno != EINVAL) 157 err(1, "ftruncate(pipe) returned wrong error"); 158 close(fds[0]); 159 close(fds[1]); 160 161 /* 162 * Make sure that ftruncate on kqueues doesn't work. 163 */ 164 fd = kqueue(); 165 if (fd < 0) 166 err(1, "kqueue"); 167 if (ftruncate(fds[0], 0) == 0) 168 errx(-1, "ftruncate(kqueue) succeeded"); 169 if (errno != EINVAL) 170 err(1, "ftruncate(kqueue) returned wrong error"); 171 close(fd); 172 173 return (0); 174 } 175