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hdf5/src/H5Gtraverse.c
Quincey Koziol 9e5dbf6906 Trim trailing whitespace
2020-04-20 18:12:00 -05:00

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5Gtraverse.c
* Sep 13 2005
* Quincey Koziol <koziol@ncsa.uiuc.edu>
*
* Purpose: Functions for traversing group hierarchy
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5Gmodule.h" /* This source code file is part of the H5G module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5CXprivate.h" /* API Contexts */
#include "H5Dprivate.h" /* Datasets */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fprivate.h" /* File access */
#include "H5Gpkg.h" /* Groups */
#include "H5Iprivate.h" /* IDs */
#include "H5Lprivate.h" /* Links */
#include "H5MMprivate.h" /* Memory management */
#include "H5Ppublic.h" /* Property Lists */
#include "H5WBprivate.h" /* Wrapped Buffers */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/* User data for path traversal routine */
typedef struct {
/* down */
hbool_t chk_exists; /* Flag to indicate we are checking if object exists */
/* up */
H5G_loc_t *obj_loc; /* Object location */
hbool_t exists; /* Indicate if object exists */
} H5G_trav_slink_t;
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
static herr_t H5G__traverse_slink_cb(H5G_loc_t *grp_loc, const char *name,
const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
H5G_own_loc_t *own_loc/*out*/);
static herr_t H5G__traverse_ud(const H5G_loc_t *grp_loc, const H5O_link_t *lnk,
H5G_loc_t *obj_loc/*in,out*/, unsigned target, hbool_t *obj_exists);
static herr_t H5G__traverse_slink(const H5G_loc_t *grp_loc, const H5O_link_t *lnk,
H5G_loc_t *obj_loc/*in,out*/, unsigned target, hbool_t *obj_exists);
static herr_t H5G__traverse_real(const H5G_loc_t *loc, const char *name,
unsigned target, H5G_traverse_t op, void *op_data);
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5G__traverse_slink_cb
*
* Purpose: Callback for soft link traversal. This routine sets the
* correct information for the object location.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Tuesday, September 13, 2005
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__traverse_slink_cb(H5G_loc_t H5_ATTR_UNUSED *grp_loc, const char H5_ATTR_UNUSED *name,
const H5O_link_t H5_ATTR_UNUSED *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
H5G_own_loc_t *own_loc/*out*/)
{
H5G_trav_slink_t *udata = (H5G_trav_slink_t *)_udata; /* User data passed in */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Check for dangling soft link */
if(obj_loc == NULL) {
if(udata->chk_exists)
udata->exists = FALSE;
else
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "component not found")
} /* end if */
else {
/* Copy new location information for resolved object */
H5O_loc_copy_deep(udata->obj_loc->oloc, obj_loc->oloc);
/* Indicate that the object exists */
udata->exists = TRUE;
} /* end else */
done:
/* Indicate that this callback didn't take ownership of the group *
* location for the object */
*own_loc = H5G_OWN_NONE;
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__traverse_slink_cb() */
/*-------------------------------------------------------------------------
* Function: H5G__traverse_ud
*
* Purpose: Callback for user-defined link traversal. Sets up a
* location ID and passes it to the user traversal callback.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Tuesday, September 13, 2005
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__traverse_ud(const H5G_loc_t *grp_loc/*in,out*/, const H5O_link_t *lnk,
H5G_loc_t *obj_loc/*in,out*/, unsigned target, hbool_t *obj_exists)
{
const H5L_class_t *link_class; /* User-defined link class */
hid_t cb_return = -1; /* The ID the user-defined callback returned */
H5G_loc_t grp_loc_copy;
H5G_name_t grp_path_copy;
H5O_loc_t grp_oloc_copy;
H5G_loc_t new_loc; /* Group location for newly opened external object */
H5G_t *grp;
hid_t cur_grp = (-1);
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Sanity check */
HDassert(grp_loc);
HDassert(lnk);
HDassert(lnk->type >= H5L_TYPE_UD_MIN);
HDassert(obj_loc);
/* Get the link class for this type of link. */
if(NULL == (link_class = H5L_find_class(lnk->type)))
HGOTO_ERROR(H5E_SYM, H5E_NOTREGISTERED, FAIL, "unable to get UD link class")
/* Set up location for user-defined callback. Use a copy of our current
* grp_loc. */
grp_loc_copy.path = &grp_path_copy;
grp_loc_copy.oloc = &grp_oloc_copy;
H5G_loc_reset(&grp_loc_copy);
if(H5G_loc_copy(&grp_loc_copy, grp_loc, H5_COPY_DEEP) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, FAIL, "unable to copy object location")
/* Create a group ID to pass to the user-defined callback */
if(NULL == (grp = H5G_open(&grp_loc_copy)))
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")
if((cur_grp = H5VL_wrap_register(H5I_GROUP, grp, FALSE)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTREGISTER, FAIL, "unable to register group")
/* User-defined callback function */
#ifndef H5_NO_DEPRECATED_SYMBOLS
/* (Backwardly compatible with v0 H5L_class_t traverssal callback) */
if(link_class->version == H5L_LINK_CLASS_T_VERS_0)
cb_return = (((const H5L_class_0_t *)link_class)->trav_func)(lnk->name, cur_grp, lnk->u.ud.udata, lnk->u.ud.size, H5CX_get_lapl());
else
cb_return = (link_class->trav_func)(lnk->name, cur_grp, lnk->u.ud.udata, lnk->u.ud.size, H5CX_get_lapl(), H5CX_get_dxpl());
#else /* H5_NO_DEPRECATED_SYMBOLS */
cb_return = (link_class->trav_func)(lnk->name, cur_grp, lnk->u.ud.udata, lnk->u.ud.size, H5CX_get_lapl(), H5CX_get_dxpl());
#endif /* H5_NO_DEPRECATED_SYMBOLS */
/* Check for failing to locate the object */
if(cb_return < 0) {
/* Check if we just needed to know if the object exists */
if(target & H5G_TARGET_EXISTS) {
/* Clear any errors from the stack */
H5E_clear_stack(NULL);
/* Indicate that the object doesn't exist */
*obj_exists = FALSE;
/* Get out now */
HGOTO_DONE(SUCCEED);
} /* end if */
/* else, we really needed to open the object */
else
HGOTO_ERROR(H5E_SYM, H5E_BADATOM, FAIL, "traversal callback returned invalid ID")
} /* end if */
/* Get the object location information from the ID the user callback returned */
if(H5G_loc(cb_return, &new_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "unable to get object location from ID")
/* Release any previous location information for the object */
H5G_loc_free(obj_loc);
/* Copy new object's location information */
H5G_loc_copy(obj_loc, &new_loc, H5_COPY_DEEP);
/* Hold the file open until we free this object header (otherwise the
* object location will be invalidated when the file closes).
*/
if(H5O_loc_hold_file(obj_loc->oloc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to hold file open")
/* We have a copy of the location and we're holding the file open.
* Close the open ID the user passed back.
*/
if(H5I_dec_ref(cb_return) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close atom from UD callback")
cb_return = (hid_t)(-1);
done:
/* Close location given to callback. */
if(cur_grp > 0 && H5I_dec_ref(cur_grp) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close atom for current location")
if(ret_value < 0 && cb_return > 0 && H5I_dec_ref(cb_return) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close atom from UD callback")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__traverse_ud() */
/*-------------------------------------------------------------------------
* Function: H5G__traverse_slink
*
* Purpose: Traverses symbolic link. The link head appears in the group
* whose entry is GRP_LOC and the link tail entry is OBJ_LOC.
*
* Return: Success: Non-negative, OBJ_LOC will contain information
* about the object to which the link points
*
* Failure: Negative
*
* Programmer: Robb Matzke
* Friday, April 10, 1998
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__traverse_slink(const H5G_loc_t *grp_loc, const H5O_link_t *lnk,
H5G_loc_t *obj_loc/*in,out*/, unsigned target, hbool_t *obj_exists)
{
H5G_trav_slink_t udata; /* User data to pass to link traversal callback */
H5G_name_t tmp_obj_path; /* Temporary copy of object's path */
hbool_t tmp_obj_path_set = FALSE; /* Flag to indicate that tmp object path is initialized */
H5O_loc_t tmp_grp_oloc; /* Temporary copy of group entry */
H5G_name_t tmp_grp_path; /* Temporary copy of group's path */
H5G_loc_t tmp_grp_loc; /* Temporary copy of group's location */
hbool_t tmp_grp_loc_set = FALSE; /* Flag to indicate that tmp group location is initialized */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Sanity check */
HDassert(grp_loc);
HDassert(lnk);
HDassert(lnk->type == H5L_TYPE_SOFT);
/* Set up temporary location */
tmp_grp_loc.oloc = &tmp_grp_oloc;
tmp_grp_loc.path = &tmp_grp_path;
/* Portably initialize the temporary objects */
H5G_loc_reset(&tmp_grp_loc);
H5G_name_reset(&tmp_obj_path);
/* Clone the group location, so we can track the names properly */
/* ("tracking the names properly" means to ignore the effects of the
* link traversal on the object's & group's paths - QAK)
*/
H5G_loc_copy(&tmp_grp_loc, grp_loc, H5_COPY_DEEP);
tmp_grp_loc_set = TRUE;
/* Hold the object's group hier. path to restore later */
/* (Part of "tracking the names properly") */
H5G_name_copy(&tmp_obj_path, obj_loc->path, H5_COPY_SHALLOW);
tmp_obj_path_set = TRUE;
/* Set up user data for traversal callback */
udata.chk_exists = (target & H5G_TARGET_EXISTS) ? TRUE : FALSE;
udata.exists = FALSE;
udata.obj_loc = obj_loc;
/* Traverse the link */
if(H5G__traverse_real(&tmp_grp_loc, lnk->u.soft.name, target, H5G__traverse_slink_cb, &udata) < 0)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "unable to follow symbolic link")
/* Pass back information about whether the object exists */
*obj_exists = udata.exists;
done:
/* Restore object's group hier. path */
if(tmp_obj_path_set) {
H5G_name_free(obj_loc->path);
H5G_name_copy(obj_loc->path, &tmp_obj_path, H5_COPY_SHALLOW);
} /* end if */
/* Release cloned copy of group location */
if(tmp_grp_loc_set)
H5G_loc_free(&tmp_grp_loc);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__traverse_slink() */
/*-------------------------------------------------------------------------
* Function: H5G__traverse_special
*
* Purpose: Handle traversing special link situations
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* koziol@hdfgroup.org
* Nov 20 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5G__traverse_special(const H5G_loc_t *grp_loc, const H5O_link_t *lnk,
unsigned target, hbool_t last_comp, H5G_loc_t *obj_loc, hbool_t *obj_exists)
{
size_t nlinks; /* # of soft / UD links left to traverse */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_PACKAGE
/* Sanity check */
HDassert(grp_loc);
HDassert(lnk);
HDassert(obj_loc);
/* If we found a symbolic link then we should follow it. But if this
* is the last component of the name and the H5G_TARGET_SLINK bit of
* TARGET is set then we don't follow it.
*/
if(H5L_TYPE_SOFT == lnk->type &&
(0 == (target & H5G_TARGET_SLINK) || !last_comp)) {
/* Get the # of soft / UD links left to traverse */
if(H5CX_get_nlinks(&nlinks) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, FAIL, "unable to retrieve # of soft / UD links to traverse")
/* Decrement # of links and range check */
if((nlinks)-- <= 0)
HGOTO_ERROR(H5E_LINK, H5E_NLINKS, FAIL, "too many links")
/* Update the # of links in the API context */
if(H5CX_set_nlinks(nlinks) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTSET, FAIL, "can't update # of soft / UD links to traverse")
/* Traverse soft link */
if(H5G__traverse_slink(grp_loc, lnk, obj_loc, (target & H5G_TARGET_EXISTS), obj_exists) < 0)
HGOTO_ERROR(H5E_LINK, H5E_TRAVERSE, FAIL, "symbolic link traversal failed")
} /* end if */
/*
* If we found a user-defined link then we should follow it. But if this
* is the last component of the name and the H5G_TARGET_UDLINK bit of
* TARGET is set then we don't follow it.
*/
if(lnk->type >= H5L_TYPE_UD_MIN &&
(0 == (target & H5G_TARGET_UDLINK) || !last_comp) ) {
/* Get the # of soft / UD links left to traverse */
if(H5CX_get_nlinks(&nlinks) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, FAIL, "unable to retrieve # of soft / UD links to traverse")
/* Decrement # of links and range check */
if((nlinks)-- <= 0)
HGOTO_ERROR(H5E_LINK, H5E_NLINKS, FAIL, "too many links")
/* Update the # of links in the API context */
if(H5CX_set_nlinks(nlinks) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTSET, FAIL, "can't update # of soft / UD links to traverse")
/* Traverse user-defined link */
if(H5G__traverse_ud(grp_loc, lnk, obj_loc, (target & H5G_TARGET_EXISTS), obj_exists) < 0)
HGOTO_ERROR(H5E_LINK, H5E_TRAVERSE, FAIL, "user-defined link traversal failed")
} /* end if */
/*
* Resolve mount points to the mounted group. Do not do this step if
* the H5G_TARGET_MOUNT bit of TARGET is set and this is the last
* component of the name.
*
* (If this link is a hard link, try to perform mount point traversal)
*
* (Note that the soft and external link traversal above can change
* the status of the object (into a hard link), so don't use an 'else'
* statement here. -QAK)
*/
if(H5F_addr_defined(obj_loc->oloc->addr) &&
(0 == (target & H5G_TARGET_MOUNT) || !last_comp)) {
if(H5F_traverse_mount(obj_loc->oloc/*in,out*/) < 0)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "mount point traversal failed")
} /* end if */
/* If the grp_loc is the only thing holding an external file open
* and obj_loc is in the same file, obj_loc should also hold the
* file open so that closing the grp_loc doesn't close the file.
*/
if(grp_loc->oloc->holding_file && grp_loc->oloc->file == obj_loc->oloc->file)
if(H5O_loc_hold_file(obj_loc->oloc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to hold file open")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__traverse_special() */
/*-------------------------------------------------------------------------
* Function: H5G__traverse_real
*
* Purpose: Internal version of path traversal routine
*
* Return: Success: Non-negative if name can be fully resolved.
*
* Failure: Negative if the name could not be fully
* resolved.
*
* Programmer: Robb Matzke
* matzke@llnl.gov
* Aug 11 1997
*
*-------------------------------------------------------------------------
*/
static herr_t
H5G__traverse_real(const H5G_loc_t *_loc, const char *name, unsigned target,
H5G_traverse_t op, void *op_data)
{
H5G_loc_t loc; /* Location of start object */
H5O_loc_t grp_oloc; /* Object loc. for current group */
H5G_name_t grp_path; /* Path for current group */
H5G_loc_t grp_loc; /* Location of group */
H5O_loc_t obj_oloc; /* Object found */
H5G_name_t obj_path; /* Path for object found */
H5G_loc_t obj_loc; /* Location of object */
size_t nchars; /* component name length */
H5O_link_t lnk; /* Link information for object */
hbool_t link_valid = FALSE; /* Flag to indicate that the link information is valid */
hbool_t obj_loc_valid = FALSE; /* Flag to indicate that the object location is valid */
H5G_own_loc_t own_loc = H5G_OWN_NONE; /* Enum to indicate whether callback took ownership of locations*/
hbool_t group_copy = FALSE; /* Flag to indicate that the group entry is copied */
char comp_buf[1024]; /* Temporary buffer for path components */
char *comp; /* Pointer to buffer for path components */
H5WB_t *wb = NULL; /* Wrapped buffer for temporary buffer */
hbool_t last_comp = FALSE; /* Flag to indicate that a component is the last component in the name */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_STATIC
/* Check parameters */
HDassert(_loc);
HDassert(name);
HDassert(op);
/*
* Where does the searching start? For absolute names it starts at the
* root of the file; for relative names it starts at CWG.
*/
/* Check if we need to get the root group's entry */
if('/' == *name) {
H5G_t *root_grp; /* Temporary pointer to root group of file */
/* Look up root group for starting location */
root_grp = H5G_rootof(_loc->oloc->file);
HDassert(root_grp);
/* Set the location entry to the root group's info */
loc.oloc = &(root_grp->oloc);
loc.path = &(root_grp->path);
} /* end if */
else {
loc.oloc = _loc->oloc;
loc.path = _loc->path;
} /* end else */
/* Set up group & object locations */
grp_loc.oloc = &grp_oloc;
grp_loc.path = &grp_path;
obj_loc.oloc = &obj_oloc;
obj_loc.path = &obj_path;
#if defined(H5_USING_MEMCHECKER) || !defined(NDEBUG)
/* Clear group location */
if(H5G_loc_reset(&grp_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to reset location")
#endif /* H5_USING_MEMCHECKER */
/* Deep copy of the starting location to group location */
if(H5G_loc_copy(&grp_loc, &loc, H5_COPY_DEEP) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to copy location")
group_copy = TRUE;
/* Clear object location */
if(H5G_loc_reset(&obj_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to reset location")
/* Wrap the local buffer for serialized header info */
if(NULL == (wb = H5WB_wrap(comp_buf, sizeof(comp_buf))))
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't wrap buffer")
/* Get a pointer to a buffer that's large enough */
if(NULL == (comp = (char *)H5WB_actual(wb, (HDstrlen(name) + 1))))
HGOTO_ERROR(H5E_SYM, H5E_NOSPACE, FAIL, "can't get actual buffer")
/* Traverse the path */
while((name = H5G__component(name, &nchars)) && *name) {
const char *s; /* Temporary string pointer */
htri_t lookup_status; /* Status from object lookup */
hbool_t obj_exists; /* Whether the object exists */
/*
* Copy the component name into a null-terminated buffer so
* we can pass it down to the other symbol table functions.
*/
H5MM_memcpy(comp, name, nchars);
comp[nchars] = '\0';
/*
* The special name `.' is a no-op.
*/
if('.' == comp[0] && !comp[1]) {
name += nchars;
continue;
} /* end if */
/* Check if this is the last component of the name */
if(!((s = H5G__component(name + nchars, NULL)) && *s))
last_comp = TRUE;
/* If there's valid information in the link, reset it */
if(link_valid) {
H5O_msg_reset(H5O_LINK_ID, &lnk);
link_valid = FALSE;
} /* end if */
/* Get information for object in current group */
if((lookup_status = H5G__obj_lookup(grp_loc.oloc, comp, &lnk/*out*/)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't look up component")
obj_exists = FALSE;
/* If the lookup was OK, build object location and traverse special links, etc. */
if(lookup_status) {
/* Sanity check link and indicate it's valid */
HDassert(lnk.type >= H5L_TYPE_HARD);
HDassert(!HDstrcmp(comp, lnk.name));
link_valid = TRUE;
/* Build object location from the link */
if(H5G__link_to_loc(&grp_loc, &lnk, &obj_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "cannot initialize object location")
obj_loc_valid = TRUE;
/* Assume object exists */
obj_exists = TRUE;
/* Perform any special traversals that the link needs */
/* (soft links, user-defined links, file mounting, etc.) */
if(H5G__traverse_special(&grp_loc, &lnk, target, last_comp, &obj_loc, &obj_exists) < 0)
HGOTO_ERROR(H5E_LINK, H5E_TRAVERSE, FAIL, "special link traversal failed")
} /* end if */
/* Check for last component in name provided */
if(last_comp) {
H5O_link_t *cb_lnk; /* Pointer to link info for callback */
H5G_loc_t *cb_loc; /* Pointer to object location for callback */
/* Set callback parameters appropriately, based on link being found */
if(lookup_status) {
cb_lnk = &lnk;
if(obj_exists)
cb_loc = &obj_loc;
else
cb_loc = NULL;
} /* end if */
else {
HDassert(!obj_loc_valid);
cb_lnk = NULL;
cb_loc = NULL;
} /* end else */
/* Call 'operator' routine */
if((op)(&grp_loc, comp, cb_lnk, cb_loc, op_data, &own_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CALLBACK, FAIL, "traversal operator failed")
HGOTO_DONE(SUCCEED)
} /* end if */
/* Handle lookup failures now */
if(!lookup_status) {
/* If an intermediate group doesn't exist & flag is set, create the group */
if(target & H5G_CRT_INTMD_GROUP) {
const H5O_ginfo_t def_ginfo = H5G_CRT_GROUP_INFO_DEF; /* Default group info settings */
const H5O_linfo_t def_linfo = H5G_CRT_LINK_INFO_DEF; /* Default link info settings */
const H5O_pline_t def_pline = H5O_CRT_PIPELINE_DEF; /* Default filter pipeline settings */
H5O_ginfo_t par_ginfo; /* Group info settings for parent group */
H5O_linfo_t par_linfo; /* Link info settings for parent group */
H5O_pline_t par_pline; /* Filter pipeline settings for parent group */
H5O_linfo_t tmp_linfo; /* Temporary link info settings */
htri_t exists; /* Whether a group or link info message exists */
const H5O_ginfo_t *ginfo; /* Group info settings for new group */
const H5O_linfo_t *linfo; /* Link info settings for new group */
const H5O_pline_t *pline; /* Filter pipeline settings for new group */
H5G_obj_create_t gcrt_info; /* Group creation info */
/* Check for the parent group having a group info message */
/* (OK if not found) */
if((exists = H5O_msg_exists(grp_loc.oloc, H5O_GINFO_ID)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to read object header")
if(exists) {
/* Get the group info for parent group */
if(NULL == H5O_msg_read(grp_loc.oloc, H5O_GINFO_ID, &par_ginfo))
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "group info message not present")
/* Use parent group info settings */
ginfo = &par_ginfo;
} /* end if */
else
/* Use default group info settings */
ginfo = &def_ginfo;
/* Check for the parent group having a link info message */
/* (OK if not found) */
/* Get the link info for parent group */
if((exists = H5G__obj_get_linfo(grp_loc.oloc, &par_linfo)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to read object header")
if(exists) {
/* Only keep the creation order information from the parent
* group's link info
*/
H5MM_memcpy(&tmp_linfo, &def_linfo, sizeof(H5O_linfo_t));
tmp_linfo.track_corder = par_linfo.track_corder;
tmp_linfo.index_corder = par_linfo.index_corder;
linfo = &tmp_linfo;
} /* end if */
else
/* Use default link info settings */
linfo = &def_linfo;
/* Check for the parent group having a filter pipeline message */
/* (OK if not found) */
if((exists = H5O_msg_exists(grp_loc.oloc, H5O_PLINE_ID)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to read object header")
if(exists) {
/* Get the filter pipeline for parent group */
if(NULL == H5O_msg_read(grp_loc.oloc, H5O_PLINE_ID, &par_pline))
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "filter pipeline message not present")
/* Use parent filter pipeline settings */
pline = &par_pline;
} /* end if */
else
/* Use default filter pipeline settings */
pline = &def_pline;
/* Create the intermediate group */
/* XXX: Should we allow user to control the group creation params here? -QAK */
gcrt_info.gcpl_id = H5P_GROUP_CREATE_DEFAULT;
gcrt_info.cache_type = H5G_NOTHING_CACHED;
HDmemset(&gcrt_info.cache, 0, sizeof(gcrt_info.cache));
if(H5G__obj_create_real(grp_oloc.file, ginfo, linfo, pline, &gcrt_info, obj_loc.oloc/*out*/) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group entry")
/* Insert new group into current group's symbol table */
if(H5G__loc_insert(&grp_loc, comp, &obj_loc, H5O_TYPE_GROUP, &gcrt_info) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert intermediate group")
/* Decrement refcount on intermediate group's object header in memory */
if(H5O_dec_rc_by_loc(obj_loc.oloc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTDEC, FAIL, "unable to decrement refcount on newly created object")
/* Close new group */
if(H5O_close(obj_loc.oloc, NULL) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close")
/* If the parent group was holding the file open, the
* newly-created group should, as well.
*/
if(grp_loc.oloc->holding_file)
if(H5O_loc_hold_file(obj_loc.oloc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to hold file open")
/* Reset any non-default object header messages */
if(ginfo != &def_ginfo)
/* (Casting away const OK - QAK) */
if(H5O_msg_reset(H5O_GINFO_ID, (void *)ginfo) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to reset group info message")
if(linfo != &def_linfo)
/* (Casting away const OK - QAK) */
if(H5O_msg_reset(H5O_LINFO_ID, (void *)linfo) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to reset link info message")
if(pline != &def_pline)
/* (Casting away const OK - QAK) */
if(H5O_msg_reset(H5O_PLINE_ID, (void *)pline) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to reset I/O pipeline message")
} /* end if */
else
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "component not found")
} /* end if */
/*
* Advance to the next component of the path.
*/
/* Transfer "ownership" of the object's information to the group object */
H5G_loc_free(&grp_loc);
H5G_loc_copy(&grp_loc, &obj_loc, H5_COPY_SHALLOW);
H5G_loc_reset(&obj_loc);
obj_loc_valid = FALSE;
/* Advance to next component in string */
name += nchars;
} /* end while */
/* Call 'operator' routine */
/* If we've fallen through to here, the name must be something like just '.'
* and we should issue the callback on that. -QAK
* Since we don't have a group location or a link to the object we pass in
* NULL.
*/
HDassert(group_copy);
if((op)(NULL, ".", NULL, &grp_loc, op_data, &own_loc) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTNEXT, FAIL, "traversal operator failed")
/* If the callback took ownership of the object location, it actually has
* ownership of grp_loc. It shouldn't have tried to take ownership of
* the "group location", which was NULL. */
HDassert(!(own_loc & H5G_OWN_GRP_LOC));
if(own_loc & H5G_OWN_OBJ_LOC)
own_loc |= H5G_OWN_GRP_LOC;
done:
/* If there's been an error, the callback doesn't really get ownership of
* any location and we should close them both */
if(ret_value < 0)
own_loc = H5G_OWN_NONE;
/* Free all open locations. This also closes any open external files. */
if(obj_loc_valid && !(own_loc & H5G_OWN_OBJ_LOC))
H5G_loc_free(&obj_loc);
if(group_copy && !(own_loc & H5G_OWN_GRP_LOC))
H5G_loc_free(&grp_loc);
/* If there's valid information in the link, reset it */
if(link_valid)
if(H5O_msg_reset(H5O_LINK_ID, &lnk) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to reset link message")
/* Release temporary component buffer */
if(wb && H5WB_unwrap(wb) < 0)
HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't release wrapped buffer")
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__traverse_real() */
/*-------------------------------------------------------------------------
* Function: H5G_traverse
*
* Purpose: Traverse a path from a location & perform an operation when
* the last component of the name is reached.
*
* Return: Success: Non-negative if path can be fully traversed.
* Failure: Negative if the path could not be fully
* traversed.
*
* Programmer: Quincey Koziol
* koziol@ncsa.uiuc.edu
* Sep 13 2005
*
*-------------------------------------------------------------------------
*/
herr_t
H5G_traverse(const H5G_loc_t *loc, const char *name, unsigned target, H5G_traverse_t op,
void *op_data)
{
size_t orig_nlinks; /* Original value for # of soft / UD links able to traverse */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
/* Check args */
if(!name || !*name)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "no name given")
if(!loc)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "no starting location")
if(!op)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "no operation provided")
/* Retrieve the original # of soft / UD links that are able to be traversed
* (So that multiple calls to H5G_traverse don't incorrectly look
* like they've traversed too many. Nested calls, like in H5L_move(),
* may need their own mechanism to set & reset the # of links to traverse)
*/
if(H5CX_get_nlinks(&orig_nlinks) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to retrieve # of soft / UD links to traverse")
/* Set up invalid tag. This is a precautionary step only. Setting an invalid
* tag here will ensure that no metadata accessed while doing the traversal
* is given an improper tag, unless another one is specifically set up
* first. This will ensure we're not accidentally tagging something we
* shouldn't be during the traversal. Note that for best tagging assertion
* coverage, setting H5C_DO_TAGGING_SANITY_CHECKS is advised.
*/
H5_BEGIN_TAG(H5AC__INVALID_TAG);
/* Go perform "real" traversal */
if(H5G__traverse_real(loc, name, target, op, op_data) < 0)
HGOTO_ERROR_TAG(H5E_SYM, H5E_NOTFOUND, FAIL, "internal path traversal failed")
/* Reset tag after traversal */
H5_END_TAG
/* Reset the # of soft / UD links that can be traversed */
if(H5CX_set_nlinks(orig_nlinks) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTSET, FAIL, "can't reset # of soft / UD links to traverse")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_traverse() */
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