You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
172 lines
3.2 KiB
172 lines
3.2 KiB
#define _GNU_SOURCE
|
|
#include<stdio.h>
|
|
#include<stdlib.h>
|
|
#include<string.h>
|
|
#include<unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include<sys/mman.h>
|
|
#include<fcntl.h>
|
|
|
|
#define FILEMODE S_IRWXU | S_IRGRP | S_IROTH
|
|
|
|
#include <map.h>
|
|
|
|
__attribute__((pure, nonnull(1)))
|
|
static inline int _map(mmap_t* restrict map)
|
|
{
|
|
//TODO: Based on map->len, choose (or calculate) appropriate `MAP_HUGE_*` flag
|
|
return (map->ptr = mmap(NULL, map->len, PROT_READ | PROT_WRITE, MAP_SHARED, map->fd, 0)) != MAP_FAILED;
|
|
}
|
|
//#define _map(...) _map(__VA_ARGS__, 0)
|
|
|
|
int map_advise_rand(mmap_t* restrict ptr, int need)
|
|
{
|
|
int flags = MADV_RANDOM | (need ? MADV_WILLNEED : 0);
|
|
if(madvise(ptr->ptr, ptr->len, flags)) {
|
|
perror("madvise() failed");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int map_raw_fd(int fd, mmap_t* restrict ptr, const size_t sz[static 1])
|
|
{
|
|
if(fd < 0) return 0;
|
|
struct stat st;
|
|
|
|
|
|
if(sz && ftruncate(fd, *sz)) {
|
|
perror("Failed to allocate");
|
|
return 0;
|
|
} else if(fstat(fd, &st) < 0) {
|
|
perror("Failed to stat file");
|
|
return 0;
|
|
}
|
|
|
|
struct mmap map = { .fd = fd, .ptr = NULL, .len = sz ? *sz : st.st_size };
|
|
|
|
if (!_map(&map)) {
|
|
perror("mmap() failed");
|
|
return 0;
|
|
}
|
|
|
|
*ptr = map;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
int open_and_map(const char* file, mmap_t* restrict ptr)
|
|
{
|
|
int fd;
|
|
struct stat st;
|
|
if ((fd = open(file, O_RDWR, FILEMODE)) < 0) {
|
|
perror("Failed to open file");
|
|
return 0;
|
|
}
|
|
|
|
if (fstat(fd, &st) < 0) {
|
|
perror("Failed to stat file");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
struct mmap map = { .fd = fd, .ptr = NULL, .len = st.st_size };
|
|
|
|
if (!_map(&map)) {
|
|
perror("mmap() failed");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
*ptr = map;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int open_and_alloc(const char* file, mmap_t* restrict ptr, size_t sz)
|
|
{
|
|
int fd;
|
|
if ((fd = open(file, O_CREAT | O_RDWR, FILEMODE)) < 0) {
|
|
perror("Failed to open file");
|
|
return 0;
|
|
}
|
|
|
|
if(ftruncate(fd, sz))
|
|
{
|
|
perror("Failed to allocate");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
struct mmap map = { .fd = fd, .ptr = NULL, .len = sz };
|
|
|
|
if (!_map(&map)) {
|
|
perror("mmap() failed");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
*ptr = map;
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
inline
|
|
int unmap_and_close_s(mmap_t map, int flags)
|
|
{
|
|
register int rval=1;
|
|
if (map.fd && msync(map.ptr, map.len, flags))
|
|
perror("msync() failed");
|
|
if (munmap(map.ptr, map.len) < 0) {
|
|
perror("munmap() failed");
|
|
rval=0;
|
|
}
|
|
if (close(map.fd) <0) {
|
|
perror("Failed to close fd");
|
|
rval=0;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
|
|
int unmap_and_close(mmap_t map)
|
|
{
|
|
return unmap_and_close_s(map, MS_SYNC /* | MS_INVALIDATE XXX: I don't think this is needed, we son't be using the mapping anymore*/);
|
|
}
|
|
|
|
__attribute__((nonnull(1)))
|
|
int dup_map(const mmap_t *in, mmap_t* restrict ptr, const size_t *new_size, enum map_flags flags)
|
|
{
|
|
int fd;
|
|
if ( (fd = dup(in->fd)) < 0 )
|
|
{
|
|
perror("dup() failed");
|
|
return 0;
|
|
}
|
|
|
|
size_t sz;
|
|
if(new_size) {
|
|
if(ftruncate(fd, sz = *new_size))
|
|
{
|
|
perror("Failed to set cloned map size");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
} else sz = in->len;
|
|
|
|
struct mmap map = { .fd = fd, .ptr = NULL, .len = sz };
|
|
|
|
if ((map.ptr = mmap(NULL, map.len, PROT_READ | (flags & MMF_READONLY ? 0 : PROT_WRITE), (flags & MMF_PRIVATE) ? MAP_PRIVATE : MAP_SHARED,fd, 0)) == MAP_FAILED) {
|
|
perror("mmap() failed");
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
*ptr = map;
|
|
return 1;
|
|
}
|