int get_fd_from_cache(FDcache fd_cache, const char path[], off_t* pst_size) {
struct pathfd_t* p;
int fd;
struct stat stat_buf;
if (fd_cache == NULL) return -1;
if (strlen(path) >= FD_CACHE_MAX_PATH_LEN - 1) return -1;
for (p = fd_cache->a; p != fd_cache->aend; ++p) {
if (!strcmp(p->path, path)) {
*pst_size = p->st_size;
return p->fd;
}
}
if ((fd = add_fd_to_cache(fd_cache, path, pst_size)) == -1) {
if ((fd = open(fd_cache->dir_prefix_buf, O_RDONLY|O_NONBLOCK)) == -1)
return -1;
if (fstat(fd, &stat_buf) == -1) {
logfl(fd_cache->logger, "fstat error: %s", strerror(errno));
return -1;
}
*pst_size = stat_buf.st_size;
return fd;
} else {
return fd;
}
}
void e820::print(const char* who) const
{
unsigned long avl_size = 0, resv_size = 0;
logfl("%s provided E820 memory map with %u entries:", who, nr_entries);
for (int i = 0; i < nr_entries; ++i) {
logfl("memory [%016lx - %016lx) %s",
map[i].addr,
map[i].addr + map[i].len,
type_to_string(map[i].type));
if (map[i].type == E820_AVAILABLE)
avl_size += map[i].len;
else
resv_size += map[i].len;
}
logfl("available memory: %u MiB reserved memory: %u KiB",
avl_size / 1MiB, resv_size / 1KiB);
}
FDcache newFDcache(const char dir_prefix[], Logger errl) {
FILE* filog;
FDcache fd_cache;
if (strlen(dir_prefix) >
FD_CACHE_DIR_PREFIX_LEN - FD_CACHE_MAX_PATH_LEN) return NULL;
if ((fd_cache = (FDcache)malloc(sizeof(struct fd_cache_t))) == NULL) {
logfl(errl, "malloc error: %s", strerror(errno));
exit(1);
}
strcpy(fd_cache->dir_prefix_buf, dir_prefix);
fd_cache->dir_prefix_pend = fd_cache->dir_prefix_buf + strlen(dir_prefix);
fd_cache->aend = fd_cache->a;
fd_cache->logger = errl;
return fd_cache;
}
static int add_fd_to_cache(FDcache fd_cache,
const char path[], off_t* pst_size) {
struct stat stat_buf;
if (fd_cache == NULL) return -1;
strcpy(fd_cache->dir_prefix_pend, path);
if (fd_cache->aend - fd_cache->a == FD_CACHE_LEN) return -1;
if ((fd_cache->aend->fd = open(fd_cache->dir_prefix_buf, O_RDONLY|O_NONBLOCK)) == -1)
return -1;
if (fstat(fd_cache->aend->fd, &stat_buf) == -1) {
logfl(fd_cache->logger, "fstat error: %s", strerror(errno));
return -1;
}
*pst_size = fd_cache->aend->st_size = stat_buf.st_size;
strcpy(fd_cache->aend->path, path);
fd_cache->aend++;
return (fd_cache->aend - 1)->fd;
}
