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 * $FreeBSD$ 27 */ 28 29 /* 30 * Very simple regression test. 31 * 32 * Future tests that might be of interest: 33 * 34 * - Make sure we get EISDIR on a directory. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/event.h> 39 #include <sys/socket.h> 40 #include <sys/stat.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <inttypes.h> 46 #include <limits.h> 47 #include <stdio.h> 48 #include <unistd.h> 49 50 /* 51 * Select various potentially interesting lengths at and around power of 2 52 * edges. 53 */ 54 static off_t lengths[] = {0, 1, 2, 3, 4, 127, 128, 129, 511, 512, 513, 1023, 55 1024, 1025, 2047, 2048, 2049, 4095, 4096, 4097, 8191, 8192, 8193, 16383, 56 16384, 16385}; 57 static int lengths_count = sizeof(lengths) / sizeof(off_t); 58 59 int 60 main(void) 61 { 62 int error, fd, fds[2], i, read_only_fd; 63 char path[] = "ftruncate_file"; 64 struct stat sb; 65 ssize_t size; 66 off_t len; 67 char ch; 68 69 /* 70 * Tests using a writable file: grow and then shrink a file 71 * using ftruncate and various lengths. Make sure that a negative 72 * file length is rejected. Make sure that when we grow the file, 73 * bytes now in the range of the file size return 0. 74 * 75 * Save a read-only reference to the file to use later for read-only 76 * descriptor tests. 77 */ 78 fd = open(path, O_RDWR|O_CREAT, 0600); 79 if (fd < 0) 80 err(1, "open(%s, O_RDWR|O_CREAT, 0600)", path); 81 read_only_fd = open(path, O_RDONLY); 82 if (read_only_fd < 0) { 83 error = errno; 84 (void)unlink(path); 85 errno = error; 86 err(1, "open(%s, O_RDONLY)", path); 87 } 88 (void)unlink(path); 89 90 if (ftruncate(fd, -1) == 0) 91 errx(1, "ftruncate(fd, -1) succeeded unexpectedly"); 92 if (errno != EINVAL) 93 err(1, "ftruncate(fd, -1) returned wrong error"); 94 95 for (i = 0; i < lengths_count; i++) { 96 len = lengths[i]; 97 if (ftruncate(fd, len) < 0) 98 err(1, "ftruncate(%jd) up", (intmax_t)len); 99 if (fstat(fd, &sb) < 0) 100 err(1, "stat"); 101 if (sb.st_size != len) 102 errx(-1, "fstat with len=%jd returned len %jd up", 103 (intmax_t)len, (intmax_t)sb.st_size); 104 if (len != 0) { 105 size = pread(fd, &ch, sizeof(ch), len - 1); 106 if (size < 0) 107 err(1, "pread on len %jd up", (intmax_t)len); 108 if (size != sizeof(ch)) 109 errx(-1, "pread len %jd size %jd up", 110 (intmax_t)len, (intmax_t)size); 111 if (ch != 0) 112 errx(-1, 113 "pread length %jd size %jd ch %d up", 114 (intmax_t)len, (intmax_t)size, ch); 115 } 116 } 117 118 for (i = lengths_count - 1; i >= 0; i--) { 119 len = lengths[i]; 120 if (ftruncate(fd, len) < 0) 121 err(1, "ftruncate(%jd) down", (intmax_t)len); 122 if (fstat(fd, &sb) < 0) 123 err(1, "stat"); 124 if (sb.st_size != len) 125 errx(-1, "fstat(%jd) returned %jd down", (intmax_t)len, 126 sb.st_size); 127 } 128 close(fd); 129 130 /* 131 * Make sure that a read-only descriptor can't be truncated. 132 */ 133 if (ftruncate(read_only_fd, 0) == 0) 134 errx(-1, "ftruncate(read_only_fd) succeeded"); 135 if (errno != EINVAL) 136 err(1, "ftruncate(read_only_fd) returned wrong error"); 137 close(read_only_fd); 138 139 /* 140 * Make sure that ftruncate on sockets doesn't work. 141 */ 142 fd = socket(PF_UNIX, SOCK_STREAM, 0); 143 if (fd < 0) 144 err(1, "socket(PF_UNIX, SOCK_STREAM, 0)"); 145 if (ftruncate(fd, 0) == 0) 146 errx(-1, "ftruncate(socket) succeeded"); 147 if (errno != EINVAL) 148 err(1, "ftruncate(socket) returned wrong error"); 149 close(fd); 150 151 /* 152 * Make sure that ftruncate on pipes doesn't work. 153 */ 154 if (pipe(fds) < 0) 155 err(1, "pipe"); 156 if (ftruncate(fds[0], 0) == 0) 157 errx(-1, "ftruncate(pipe) succeeded"); 158 if (errno != EINVAL) 159 err(1, "ftruncate(pipe) returned wrong error"); 160 close(fds[0]); 161 close(fds[1]); 162 163 /* 164 * Make sure that ftruncate on kqueues doesn't work. 165 */ 166 fd = kqueue(); 167 if (fd < 0) 168 err(1, "kqueue"); 169 if (ftruncate(fds[0], 0) == 0) 170 errx(-1, "ftruncate(kqueue) succeeded"); 171 if (errno != EINVAL) 172 err(1, "ftruncate(kqueue) returned wrong error"); 173 close(fd); 174 175 return (0); 176 } 177