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CentOS 7.0 - man page for hesiod_init (centos section 3)

HESIOD(3)			     Library Functions Manual				HESIOD(3)

       hesiod, hesiod_init, hesiod_resolve, hesiod_free_list, hesiod_to_bind, hesiod_free_string,
       hesiod_end - Hesiod name server interface library

       #include <hesiod.h>

       int hesiod_init(void **context)
       char **hesiod_resolve(void *context, const char *name,
	    const char *type)
       void hesiod_free_list(void *context, char **list);
       char *hesiod_to_bind(void *context, const char *name,
	    const char *type)
       void hesiod_free_string(void *context, char *str);
       char **hesiod_parse_result(void *context,
       unsigned const char *result, int rlen)
       void hesiod_end(void *context)

       cc file.c -lhesiod

       This family of functions allows you to perform lookups of  Hesiod  information,	which  is
       stored  as  text  records  in the Domain Name Service.  To perform lookups, you must first
       initialize a context, an opaque object which stores information	used  internally  by  the
       library	between  calls.  hesiod_init initializes a context, storing a pointer to the con-
       text in the location pointed to by the context argument.  hesiod_end frees  the	resources
       used by a context.

       hesiod_resolve  is the primary interface to the library.  If successful, it returns a list
       of one or more strings giving the records matching name and type.  The last element of the
       list  is  followed  by  a  NULL	pointer.   It is the caller's responsibility to call hes-
       iod_free_list to free the resources used by the returned list.

       hesiod_to_bind converts name and type into the DNS name used by hesiod_resolve.	It is the
       caller's responsibility to free the returned string using hesiod_free_string.

       hesiod_parse_result parses the result of a name server query into text records.	It is the
       caller's responsibility to call	hesiod_free_list  to  free  the  resources  used  by  the
       returned list.

       If  successful,	hesiod_init returns 0; otherwise it returns -1 and sets errno to indicate
       the error.  On failure, hesiod_resolve and hesiod_to_bind return NULL and set  the  global
       variable errno to indicate the error.

       If  the	environment variable HES_DOMAIN is set, it will override the domain in the Hesiod
       configuration file.  If the environment variable HESIOD_CONFIG is set,  it  specifies  the
       location of the Hesiod configuration file.

       `Hesiod - Project Athena Technical Plan -- Name Service', named(8), hesiod.conf(5)

       Hesiod calls may fail because of:

       ENOMEM Insufficient memory was available to carry out the requested operation.

	      hesiod_init failed because the Hesiod configuration file was invalid.

	      hesiod_resolve  failed  because  no  name  server  could be contacted to answer the

	      hesiod_resolve or hesiod_to_bind failed because the query or response was  too  big
	      to fit into the packet buffers.

       ENOENT hesiod_resolve failed because the name server had no text records matching name and
	      type, or hesiod_to_bind failed because the name argument	had  a	domain	extension
	      which could not be resolved with type ``rhs-extension'' in the local Hesiod domain.

       EINVAL hesiod_to_bind  failed to convert the resulting domain name from UTF-8 to an inter-
	      nationalized domain name.

       Steve Dyer, IBM/Project Athena
       Greg Hudson, MIT Team Athena
       Copyright 1987, 1988, 1995, 1996, 2000 by the Massachusetts Institute of Technology.

       The strings corresponding to the errno values set by the Hesiod functions are not particu-
       larly indicative of what went wrong, especially for ENOEXEC and ENOENT.

					 30 November 1996				HESIOD(3)

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