Add example of use of mmap
This commit is contained in:
Godzil
parent
57ae74c803
commit
c37e562e5f
@ -1,23 +1,27 @@
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SRC = console-read.c drums3.c echo.c helloworld.c logring.c pager.c\
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drums2.c drums.c ioctl.c uid-filter.c
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OBJ = console-read.o drums3.o echo.o helloworld.o logring.o pager.o\
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drums2.o drums.o ioctl.o uid-filter.o
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drums2.o drums.o ioctl.o uid-filter.o mmap-test.o
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TARGETS = console-read drums3 echo helloworld logring pager\
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drums2 drums ioctl uid-filter
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drums2 drums ioctl uid-filter mmap-test
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default: $(TARGETS)
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default: $(TARGETS) mmap-read
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install: $(TARGETS)
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clean:
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rm -f *.o *.d $(TARGETS) gmon.out *~
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$(TARGETS): %: %.c
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mmap-read: mmap-read.c
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$(CC) $< -o $@
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$(TARGETS): %: %.c ../libfusd/libfusd.a
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$(CC) $(GCF) $< -o $@ ../libfusd/libfusd.a
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%.d: %.c
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$(CC) -M $(CFLAGS) $< > $@.$$$$; sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; rm -f $@.$$$$
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ifeq ($(MAKECMDGOALS),target)
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include $(SRC:.c=.d)
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endif
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110
examples/mmap-read.c
Normal file
110
examples/mmap-read.c
Normal file
@ -0,0 +1,110 @@
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/*
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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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146
examples/mmap-test.c
Normal file
146
examples/mmap-test.c
Normal file
@ -0,0 +1,146 @@
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/*
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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 example creates a a mmap-able buffer.
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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 <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 "fusd.h"
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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#define BUFFER_SIZE 1024
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static char *mmap_buffer;
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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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ssize_t mmaptest_read(struct fusd_file_info *file, char *user_buffer,
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size_t user_length, loff_t *offset)
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{
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int len;
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if (*offset > BUFFER_SIZE) {
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return 0;
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}
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len = MIN(user_length + (*offset), BUFFER_SIZE);
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memcpy(user_buffer, mmap_buffer + (*offset), len);
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*offset += len;
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return len;
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}
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int tester_mmap(struct fusd_file_info *file, int offset, size_t length, int prot, int flags,
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void **addr, size_t *out_length)
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{
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printf("Got a mmap request from PID:%d [offset=%d, size=%d, prot=%X, flags=%X, addr=%p]\n",
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file->pid, offset, length, prot, flags, *addr);
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if (length <= BUFFER_SIZE) {
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*addr = mmap_buffer;
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*out_length = BUFFER_SIZE;
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return 0;
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}
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return -1;
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}
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int do_open(struct fusd_file_info *file)
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{
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/* opens and closes always succeed */
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return 0;
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}
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int do_close(struct fusd_file_info *file)
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{
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/* Show content of the buffer */
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hexdump(mmap_buffer, 512);
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return 0;
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}
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struct fusd_file_operations drums_fops = {
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open: do_open,
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read: mmaptest_read,
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mmap: tester_mmap,
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close: do_close
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};
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int main(int argc, char *argv[])
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{
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int i;
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mmap_buffer = (char *)mmap(NULL, BUFFER_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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if (fusd_register("mmap-tester", "mmaptest", "mmap-tester", 0666, NULL, &drums_fops) < 0) {
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fprintf(stderr, "mmap-tester register failed: %m\n");
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return -1;
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}
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memset(mmap_buffer, 0xAA, BUFFER_SIZE);
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fprintf(stderr, "calling fusd_run...\n");
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fusd_run();
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return 0;
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}
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