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- /*
- *
- * 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 <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <errno.h>
- #include <ctype.h>
- #include <unistd.h>
- #include <sys/mman.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <fcntl.h>
- 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;
- }
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