hesiod(3) [centos man page]

HESIOD(3)						     Library Functions Manual							 HESIOD(3)

NAME

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

SYNOPSIS

       #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

DESCRIPTION

       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 context 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 match-
       ing name and type.  The last element of the list is followed by a NULL pointer.	It is the caller's responsibility to call hesiod_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.

RETURN VALUES

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

ENVIRONMENT

       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.

SEE ALSO

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

ERRORS

       Hesiod calls may fail because of:

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

       ENOEXEC
	      hesiod_init failed because the Hesiod configuration file was invalid.

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

       EMSGSIZE
	      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 internationalized domain name.

AUTHOR

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

BUGS

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

								 30 November 1996							 HESIOD(3)

HESIOD(3)						     Library Functions Manual							 HESIOD(3)

NAME

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

SYNOPSIS

       #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

DESCRIPTION

       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 context 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 match-
       ing name and type.  The last element of the list is followed by a NULL pointer.	It is the caller's responsibility to call hesiod_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.

RETURN VALUES

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

ENVIRONMENT

       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.

SEE ALSO

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

ERRORS

       Hesiod calls may fail because of:

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

       ENOEXEC
	      hesiod_init failed because the Hesiod configuration file was invalid.

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

       EMSGSIZE
	      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 internationalized domain name.

AUTHOR

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

BUGS

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

								 30 November 1996							 HESIOD(3)