Libgenders(3pm)
NAME
Libgenders - Perl extension for libgenders
SYNOPSIS
use Libgenders; Libgenders::GENDERS_ERR_SUCCESS Libgenders::GENDERS_ERR_NULLHANDLE Libgenders::GENDERS_ERR_OPEN Libgenders::GENDERS_ERR_READ Libgenders::GENDERS_ERR_PARSE Libgenders::GENDERS_ERR_NOTLOADED Libgenders::GENDERS_ERR_ISLOADED Libgenders::GENDERS_ERR_OVERFLOW Libgenders::GENDERS_ERR_PARAMETERS Libgenders::GENDERS_ERR_NULLPTR Libgenders::GENDERS_ERR_NOTFOUND Libgenders::GENDERS_ERR_SYNTAX Libgenders::GENDERS_ERR_QUERYINPUT Libgenders::GENDERS_ERR_OUTMEM Libgenders::GENDERS_ERR_MAGIC Libgenders::GENDERS_ERR_INTERNAL Libgenders::GENDERS_ERR_ERRNUMRANGE Libgenders::GENDERS_DEFAULT_FILE $handle = Libgenders->genders_handle_create(); $handle->genders_load_data([$filename]); $handle->genders_errnum() $handle->genders_strerror($errnum) $handle->genders_errormsg() $handle->genders_perror($msg) $handle->genders_getnumnodes() $handle->genders_getnumattrs() $handle->genders_getnodename() $handle->genders_getnodes([$attr, [$val]]) $handle->genders_getattr([$node]) $handle->genders_getattr_all() $handle->genders_getattrval($attr, [$node]) $handle->genders_testattr($attr, [$node]) $handle->genders_testattrval($attr, $val, [$node]) $handle->genders_isnode([$node]) $handle->genders_isattr($attr) $handle->genders_isattrval($attr, $val) $handle->genders_index_attrvals($attr) $handle->genders_query($query) $handle->genders_testquery($query, [$node]) $handle->genders_parse([$filename]);
DESCRIPTION
- This package provides an OO perl interface to the genders C API (see
libgenders(3)). The perl interface is simliar to the genders C API, with some necessary changes due to the inherent differences between C
and perl. Some of the functions from the C API cannot be accessed via this perl interface, some new functions were created, the behavior of
some functions was modified, and the parameters passed into some
functions has been changed. Please read the instructions below so to
understand how to use the Libgenders package. - Initialization
- Libgenders->genders_handle_create
Returns a genders object on success, undef on error.
- $handle->genders_load_data([$filename])
Opens, reads, and parses the genders file specified by $filename.
If $filename is not specified, the default genders file is parsed. Returns 0 on success, -1 on error. - Error Messages
- Similarly to the C API, an error code is stored in the genders object
after an error has occurred. The following can be used to retrieve the error code and output information about the error. - $handle->ggeennddeerrss__eerrrrnnuumm(())
Returns the error code most recently set.
- $handle->genders_strerror($errnum)
Returns a string describing the error code $errnum.
- $handle->ggeennddeerrss__eerrrroorrmmssgg(())
Returns a string describing the most recent error.
- $handle->genders_perror([$msg])
Outputs $msg and a string describing the most recent error to
standard error. If $msg is not specified, only a description of
the most recent error will be output to standard error. - Utility Functions
- $handle->ggeennddeerrss__ggeettnnuummnnooddeess(())
Returns the number of nodes listed in the genders file. Returns -1 on error.
- $handle->ggeennddeerrss__ggeettnnuummaattttrrss(())
Returns the number of attributes listed in the genders file.
Returns -1 on error. - $handle->ggeennddeerrss__ggeettnnooddeennaammee(())
Returns the shortened hostname of the current node. Returns undef on error.
- Parsing Functions
- $handle->genders_getnodes([$attr, [$val]])
Returns a reference to a list of nodes that have the specified
attribute and value. If $val is not specified, only $attr is
considered. If both $attr and $val are not specified, all nodes
listed in the genders file are returned. Returns undef on error. - $handle->genders_getattr([$node])
Returns a reference to an array that holds references to two lists. The first list is a reference to an array of attributes for the
specified node. The second list is a reference to an array of
values for the specified node. If $node is not specified, the
local node is used. Returns undef on error. - $handle->ggeennddeerrss__ggeettaattttrr__aallll(())
Returns a reference to a list of all the attributes listed in the
genders file. Returns undef on error. - $handle->genders_getattrval($attr, [$node])
Returns the value of an attribute listed in a node. Returns the
empty string if the attribute has no value. If $node is not
specified, local node is used. Returns undef on error. - $handle->genders_testattr($attr, [$node])
Tests if a node has a specified attribute. If $node is not
specified, local node is used. Returns 1 if the node contains the attribute, 0 if not, -1 on error. - $handle->genders_testattrval($attr, $$vvaall, [$node])
Tests if a node has a specified attribute=value pair. If $node is not specified, local node is used. Returns 1 if the node contains the attribute=value pair, 0 if not, -1 on error.
- $handle->genders_isnode([$node])
Tests if a node is listed in the genders file. If $node is not
specified, local node is used. Returns 1 if the node is listed, 0 if it is not, -1 on error. - $handle->genders_isattr($attr)
Tests if the attribute $attr is listed in the genders file.
Returns 1 if the attribute is listed, 0 if it is not, -1 on error. - $handle->genders_isattrval($attr, $$vvaall)
Tests if the attribute=value pair is listed in the genders file.
Returns 1 if the pair is listed, 0 if it is not, -1 on error. - $handle->genders_index_attrvals($attr)
Internally adds indexing to decrease search times for genders
attribute value combinations. Will specifically aid performance of the genders_getnodes and genders_isattrval functions. Only one
attribute can be indexed at a time. Subsequent calls to this
function with a different attribute will overwrite earlier indexes. - $handle->genders_query($query)
Returns a reference to a list of nodes specified by a genders
query. A genders query is based on the union, intersection, set
difference, or complement between genders attributes and values.
Union is represented by two pipe symbols ('||'), intersection by
two ampersand symbols ('&&'), difference by two minus symbols
('--'), and complement by a tilde ('~') Operations are performed
from left to right. Parentheses may be used to change the order of operations. For example, the following query would retrieve all
nodes other than management or login nodes: "all-(mgmt+login)". If $query is not specified, all nodes listed in the genders file are
returned. Returns undef on error. - $handle->genders_testquery($query, [$node])
Tests if a node meets the conditions specified in the query. If
$node is not specified, local node is used. Returns 1 if the node is contained within the query, 0 if not, -1 on error. - $handle->genders_parse([$filename])
Parse a genders file and output parse errors to standard error. If $filename is not specified, the default genders file is parsed.
Returns the number of errors (0 if no parse errors were found) on
success, -1 on error. - Error Codes/Constants
- The same error codes and constants listed in /usr/include/genders.h can
be accessed through the following functions:
Libgenders::GENDERS_ERR_SUCCESS
Libgenders::GENDERS_ERR_NULLHANDLE
Libgenders::GENDERS_ERR_OPEN
Libgenders::GENDERS_ERR_READ
Libgenders::GENDERS_ERR_PARSE
Libgenders::GENDERS_ERR_NOTLOADED
Libgenders::GENDERS_ERR_ISLOADED
Libgenders::GENDERS_ERR_OVERFLOW
Libgenders::GENDERS_ERR_PARAMETERS
Libgenders::GENDERS_ERR_NULLPTR
Libgenders::GENDERS_ERR_NOTFOUND
Libgenders::GENDERS_ERR_OUTMEM
Libgenders::GENDERS_ERR_SYNTAX
Libgenders::GENDERS_ERR_QUERYINPUT
Libgenders::GENDERS_ERR_MAGIC
Libgenders::GENDERS_ERR_INTERNAL
Libgenders::GENDERS_ERR_ERRNUMRANGE
Libgenders::GENDERS_DEFAULT_FILE
AUTHOR
Albert Chu <chu11@llnl.gov>
SEE ALSO
- libgenders