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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdint.h>
#include "code-manager.h"
#include "list.h"
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
typedef struct file_t file_t;
typedef struct block_t block_t;
/* List of *files*;
* List of *segments*, each of which has a name and a pointer into a file
*/
#define FILENAME_SIZE 128
#define FUNCTION_NAME_SIZE 128
struct file_t
{
link_t link;
char name[FILENAME_SIZE];
size_t map_size;
uint8_t * writable;
uint8_t * executable;
size_t position;
};
static bool_t
get_tmp_file (char *template, size_t size,
uint8_t **writable, uint8_t **executable)
{
uint8_t *w, *x;
int fd;
w = NULL;
x = NULL;
if ((fd = mkstemp (template)) == -1)
goto out_error;
unlink (template);
if (ftruncate (fd, size) == -1)
goto out_error;
w = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (!w)
goto out_error;
x = mmap (NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0);
if (!x)
goto out_error;
*writable = w;
*executable = x;
close (fd);
return TRUE;
out_error:
if (w)
munmap (w, size);
if (x)
munmap (x, size);
if (fd != -1)
close (fd);
return FALSE;
}
static file_t *
file_new (const char *prefix, size_t n_bytes)
{
char names[2][FILENAME_SIZE];
file_t *file = malloc (sizeof *file);
size_t page_mask;
int i;
if (!file)
return NULL;
snprintf (names[0], FILENAME_SIZE - 1, "/tmp/%s-XXXXXX", prefix);
snprintf (names[1], FILENAME_SIZE - 1, "/var/tmp/%s-XXXXXX", prefix);
page_mask = getpagesize() - 1;
n_bytes = (n_bytes + page_mask) & ~page_mask;
for (i = 0; i < sizeof (names) / sizeof (names[0]); ++i)
{
uint8_t *writable = NULL;
uint8_t *executable = NULL;
if (get_tmp_file (names[i], n_bytes, &writable, &executable))
{
strcpy (file->name, names[i]);
file->writable = writable;
file->executable = executable;
file->map_size = n_bytes;
file->position = 0;
return file;
}
}
free (file);
return NULL;
}
static bool_t
file_alloc (file_t *file, int n_bytes,
size_t align_bits, size_t align_mask,
uint8_t **writable, uint8_t **executable)
{
file->position += (align_bits - file->position) & align_mask;
if (file->position + n_bytes > file->map_size)
return FALSE;
*writable = file->writable + file->position;
*executable = file->executable + file->position;
file->position += n_bytes;
return TRUE;
}
static void
file_free (file_t *file)
{
munmap (file->writable, file->map_size);
munmap (file->executable, file->map_size);
free (file);
}
struct code_manager_t
{
char prefix[32];
list_t files;
};
code_manager_t *
code_manager_new (const char *prefix)
{
code_manager_t *man;
if (!(man = malloc (sizeof *man)))
return NULL;
memset (man->prefix, 0, sizeof man->prefix);
strncpy (man->prefix, prefix, sizeof man->prefix - 1);
list_init (&man->files);
return man;
}
#define MIN_FILE_SIZE (1024 * 1024)
bool_t
code_manager_alloc (code_manager_t *manager,
const char *name, size_t n_bytes,
size_t align_bits, size_t align_mask,
uint8_t **writable, uint8_t **executable)
{
file_t *file = NULL;
if (!list_is_empty (&manager->files))
file = CONTAINER_OF (file_t, link, manager->files.head);
while (!file || !file_alloc (
file, n_bytes, align_bits, align_mask, writable, executable))
{
size_t fsize = (n_bytes > MIN_FILE_SIZE)? n_bytes : MIN_FILE_SIZE;
if (!(file = file_new (manager->prefix, fsize)))
return FALSE;
list_prepend (&manager->files, &file->link);
}
return TRUE;
}
void
code_manager_free (code_manager_t *manager)
{
link_t *link;
LIST_FOREACH (&manager->files, link)
{
file_t *file = CONTAINER_OF (file_t, link, link);
file_free (file);
}
free (manager);
}
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