#ifdef OS_solaris
* This is all for Solaris 2.6.
*
* Sun defined a new API in Solaris2.6 to be used when manipulating large
* (>2Gbyte) files. This API isn't present in 2.5.x, so we can't simply
* call it -- that would mean two binaries, one for 2.5.x and the other for
* 2.6. Not pretty. So, what we do here is determine the OS on which we're
* running at runtime, and adjust the underlying Berkeley DB calls to use
* the new API if it's there.
*/
/* This must match the definition of stat64 in Solaris2.6 */
struct our_stat64 {
dev_t st_dev;
long st_pad1[3]; /* reserve for dev expansion */
u_longlong_t st_ino;
mode_t st_mode;
nlink_t st_nlink;
uid_t st_uid;
gid_t st_gid;
dev_t st_rdev;
long st_pad2[2];
longlong_t st_size;
timestruc_t mst_atime;
timestruc_t mst_mtime;
timestruc_t mst_ctime;
long st_blksize;
longlong_t st_blocks; /* large file support */
char st_fstype[_ST_FSTYPSZ];
long st_pad4[8]; /* expansion area */
};
#define MEGABYTE (1024 * 1024)
typedef int (*open_fn)(const char *path, int flags, ...);
typedef longlong_t (*lseek64_fn)(int fildes, longlong_t offset, int whence);
typedef longlong_t (*fstat64_fn)(int fildes, struct our_stat64 *s);
typedef void* (*mmap64_fn)(void* addr, size_t len, int prot, int flags,
int filedes, longlong_t off);
static fstat64_fn os_fstat64_fn = NULL;
static lseek64_fn os_lseek64_fn = NULL;
static mmap64_fn os_mmap64_fn = NULL;
static open_fn os_open64_fn = NULL;
static int dblayer_load_largefile_fns()
{
void *lib_handle = NULL;
void *function_found = NULL;
int ret = 0;
lib_handle = dlopen(NULL, RTLD_NOW);
if (NULL == lib_handle)
return (-1);
function_found = dlsym(lib_handle,"open64");
if (NULL == function_found)
return (-1);
os_open64_fn = (open_fn)function_found;
function_found = dlsym(lib_handle,"lseek64");
if (NULL == function_found)
return (-1);
os_lseek64_fn = (lseek64_fn)function_found;
function_found = dlsym(lib_handle,"fstat64");
if (NULL == function_found)
return (-1);
os_fstat64_fn = (fstat64_fn)function_found;
function_found = dlsym(lib_handle,"mmap64");
if (NULL == function_found)
return (-1);
os_mmap64_fn = (mmap64_fn)function_found;
return 0;
}
/* Helper function for large seeks */
static int dblayer_seek_fn_solaris(int fd,
size_t pgsize, db_pgno_t pageno, u_long relative, int whence)
{
longlong_t offset = 0;
longlong_t ret = 0;
if (NULL == os_lseek64_fn) {
return -1;
}
offset = (longlong_t)pgsize * pageno + relative;
ret = (*os_lseek64_fn)(fd,offset,whence);
return (ret == -1) ? errno : 0;
}
/* Helper function for large file mmap */
static int dblayer_map_solaris(fd, len, is_private, is_rdonly, addr)
int fd, is_private, is_rdonly;
size_t len;
void **addr;
{
void *p;
int flags, prot;
flags = is_private ? MAP_PRIVATE : MAP_SHARED;
prot = PROT_READ | (is_rdonly ? 0 : PROT_WRITE);
if ((p = (*os_mmap64_fn)(NULL,
len, prot, flags, fd, (longlong_t)0)) == (void *)MAP_FAILED)
return (errno);
*addr = p;
return (0);
}
/* Helper function for large fstat */
static int dblayer_ioinfo_solaris(const char *path,
int fd, u_int32_t *mbytesp, u_int32_t *bytesp, u_int32_t *iosizep)
{
struct our_stat64 sb;
if (NULL == os_fstat64_fn) {
return -1;
}
if ((*os_fstat64_fn)(fd, &sb) == -1)
return (errno);
/* Return the size of the file. */
if (mbytesp != NULL)
*mbytesp = (u_int32_t) (sb.st_size / (longlong_t)MEGABYTE);
if (bytesp != NULL)
*bytesp = (u_int32_t) (sb.st_size % (longlong_t)MEGABYTE);
/*
* Return the underlying filesystem blocksize, if available. Default
* to 8K on the grounds that most OS's use less than 8K as their VM
* page size.
*/
if (iosizep != NULL)
*iosizep = sb.st_blksize;
return (0);
}
#endif
#ifdef irix
* A similar mess to Solaris: a new API added in IRIX6.2 to support large
* files. We always build on 6.2 or later, so no need to do the same song
* and dance as on Solaris -- we always have the header files for the
* 64-bit API.
*/
/* Helper function for large seeks */
static int dblayer_seek_fn_irix(int fd,
size_t pgsize, db_pgno_t pageno, u_long relative, int whence)
{
off64_t offset = 0;
off64_t ret = 0;
offset = (off64_t)pgsize * pageno + relative;
ret = lseek64(fd,offset,whence);
return (ret == -1) ? errno : 0;
}
/* Helper function for large fstat */
static int dblayer_ioinfo_irix(const char *path,
int fd, u_int32_t *mbytesp, u_int32_t *bytesp, u_int32_t *iosizep)
{
struct stat64 sb;
if (fstat64(fd, &sb) == -1) {
return (errno);
}
/* Return the size of the file. */
if (mbytesp != NULL)
*mbytesp = (u_int32_t) (sb.st_size / (off64_t)MEGABYTE);
if (bytesp != NULL)
*bytesp = (u_int32_t) (sb.st_size % (off64_t)MEGABYTE);
if (iosizep != NULL)
*iosizep = sb.st_blksize;
return (0);
}
#endif /* irix */
static int dblayer_override_libdb_functions(dblayer_private *priv)
{
#if defined(OS_solaris)
int ret = 0;
ret = dblayer_load_largefile_fns();
if (0 != ret) {
Debug("Not Solaris2.6: no large file support enabled\n");
} else {
/* Means we did get the XXX64 functions, so let's use them */
db_jump_set((void*)os_open64_fn, DB_FUNC_OPEN);
db_jump_set((void*)dblayer_seek_fn_solaris, DB_FUNC_SEEK);
db_jump_set((void*)dblayer_ioinfo_solaris, DB_FUNC_IOINFO);
db_jump_set((void*)dblayer_map_solaris, DB_FUNC_MAP);
Debug("Solaris2.6: selected 64-bit file handling.\n");
}
#else
#if defined (irix)
db_jump_set((void*)dblayer_seek_fn_irix, DB_FUNC_SEEK);
db_jump_set((void*)dblayer_ioinfo_irix, DB_FUNC_IOINFO);
#endif /* irix */
#endif /* OS_solaris */
return 0;
}