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