fusd/examples/mmap-test.c

147 lines
3.9 KiB
C

/*
*
* 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 example creates a a mmap-able buffer.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/mman.h>
#include "fusd.h"
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define BUFFER_SIZE 4096
static char *mmap_buffer;
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("-------------------------------------------------------------------------------------");
}
ssize_t mmaptest_read(struct fusd_file_info *file, char *user_buffer,
size_t user_length, loff_t *offset)
{
int len;
if (*offset > BUFFER_SIZE) {
return 0;
}
len = MIN(user_length + (*offset), BUFFER_SIZE);
memcpy(user_buffer, mmap_buffer + (*offset), len);
*offset += len;
return len;
}
int tester_mmap(struct fusd_file_info *file, int offset, size_t length, int prot, int flags,
void **addr, size_t *out_length)
{
printf("Got a mmap request from PID:%d [offset=%d, size=%d, prot=%X, flags=%X, addr=%p]\n",
file->pid, offset, length, prot, flags, *addr);
if (length <= BUFFER_SIZE) {
*addr = mmap_buffer;
*out_length = BUFFER_SIZE;
return 0;
}
return -1;
}
int do_open(struct fusd_file_info *file)
{
/* opens and closes always succeed */
return 0;
}
int do_close(struct fusd_file_info *file)
{
/* Show content of the buffer */
hexdump(mmap_buffer, 512);
return 0;
}
struct fusd_file_operations drums_fops = {
open: do_open,
read: mmaptest_read,
mmap: tester_mmap,
close: do_close
};
int main(int argc, char *argv[])
{
int i;
mmap_buffer = (char *)mmap(NULL, BUFFER_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (fusd_register("mmap-tester", "mmaptest", "mmap-tester", 0666, NULL, &drums_fops) < 0) {
fprintf(stderr, "mmap-tester register failed: %m\n");
return -1;
}
memset(mmap_buffer, 0xAA, BUFFER_SIZE);
fprintf(stderr, "calling fusd_run...\n");
fusd_run();
return 0;
}