/* * * Copyright (c) 2003 The Regents of the University of California. All * rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /* * FUSD - The Framework for UserSpace Devices - Example program * * This mmap a file/device and change it a bit. */ #include #include #include #include #include #include #include #include #include #include #include #include static void hexdump(void *ptr_r, int size) { int J, I; unsigned char *ptr = ptr_r; unsigned long Addr = 0; if (ptr == NULL) { puts("NULL POINTER"); puts("-------------------------------------------------------------------------------------"); return; } while (Addr <= size) { for (J = 0; J < 2; J++) { printf("%08p: ", Addr + ptr); for (I = 0; I < 16; I++, Addr++) { if (Addr <= size) { printf("%02lX ", (unsigned char) ptr[Addr]); } else { printf(" "); } } printf(" | "); Addr -= 16; for (I = 0; I < 16; I++, Addr++) { if (Addr <= size) { putchar(isprint(ptr[Addr]) ? ptr[Addr] : '.'); } else { putchar(' '); } } puts(""); } } puts("-------------------------------------------------------------------------------------"); } int main(int argc, char *argv[]) { int fd, i; char *ptr; int size = 0; struct stat FileStat; srand((unsigned int) time(NULL)); if (argc != 3) { printf("Usage: %s file size"); } fd = open(argv[1], O_RDWR); size = atoi(argv[2]); ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); printf("ptr = %p\n", ptr); if ((ptr != NULL) && (ptr != MAP_FAILED)) { hexdump(ptr, size); /* Let's do some changes */ for (i = 0; i < 128; i++) { ptr[i] ^= rand() % 0x100; } msync(ptr, size, MS_SYNC|MS_INVALIDATE); hexdump(ptr, size); } close(fd); return 0; }