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#include <stdlib.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/fcntl.h>
#include <unistd.h>
#include <litmus/rt_param.h>
#include "color.h"
#define LITMUS_COLOR_ALLOC "/dev/litmus/color_alloc"
#define LITMUS_COLOR_CTRL "/dev/litmus/color_ctrl"
static int map_file(const char* filename, void **addr, size_t size)
{
int error = 0;
int fd;
if (size > 0) {
fd = open(filename, O_RDWR);
if (fd >= 0) {
*addr = mmap(NULL, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE,
fd, 0);
if (*addr == MAP_FAILED)
error = -1;
close(fd);
} else
error = fd;
} else
*addr = NULL;
return error;
}
int map_color_ctrl(void **addr)
{
return map_file(LITMUS_COLOR_CTRL, addr, PAGE_SIZE);
}
void* color_malloc(size_t size)
{
int err;
void *mem;
err = map_file(LITMUS_COLOR_ALLOC, &mem, size);
if (err)
mem = NULL;
return mem;
}
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