1 /* $OpenBSD: mmaptest.c,v 1.5 2004/10/10 03:08:30 mickey Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Niklas Hallqvist. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/mman.h> 31 #include <err.h> 32 #include <fcntl.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 37 #define TEMPL "test-fileXXXXXXXXXX" 38 #define MAGIC 0x1234 39 40 int 41 main(int argc, char **argv) 42 { 43 int fd; 44 void *v; 45 int i; 46 ssize_t n; 47 static char nm[] = TEMPL; 48 off_t sz; 49 50 fd = mkstemp(nm); 51 if (fd == -1) 52 err(1, "mkstemp"); 53 sz = sysconf(_SC_PAGESIZE); 54 if (sz == -1) 55 err(1, "sysconf"); 56 if (ftruncate(fd, sz) == -1) 57 err(1, "ftruncate"); 58 v = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 59 if (v == MAP_FAILED) 60 err(1, "mmap"); 61 *(int *)v = MAGIC; 62 if (msync(v, sz, MS_SYNC) == -1) 63 err(1, "msync"); 64 if (munmap(v, sz) == -1) 65 err(1, "munmap"); 66 if (close(fd) == -1) 67 err(1, "close"); 68 fd = open(nm, O_RDONLY); 69 if (fd == -1) 70 err(1, "open"); 71 if (unlink(nm) == -1) 72 err(1, "unlink"); 73 n = read(fd, &i, sizeof i); 74 if (n == -1) 75 err(1, "read"); 76 if (n != sizeof i) 77 errx(1, "short read"); 78 if (close(fd) == -1) 79 err(1, "close"); 80 exit(i != MAGIC); 81 } 82