nsdispatch man page on DigitalUNIX

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nsdispatch(3)							 nsdispatch(3)

       nsdispatch - name service switch dispatcher routine

       #include <nsswitch.h>

       int nsdispatch(
	       void  *retval,  constns_dtabdtab[],const	 char*	database const
       char *method const ns_src defaults[], ...  );

       The nsdispatch() function invokes the callback functions	 specified  in
       dtab  in the order given in /etc/nsswitch.conf for the database until a
       successful entry is found.

       retval is passed to each callback function to modify as	necessary  (to
       pass back to the caller of nsdispatch())

       dtab  is	 an array of ns_dtab structures, which have the following for‐

	typedef struct {
			  const char *src;
			  int (*cb)(void *retval, void *cb_data, va_list ap);
			  void *cb_data;
			   } ns_dtab;

       For each source type that is implemented, an entry with src set to  the
       name of the source, cb defined as a function which handles that source,
       and cb_data is used to pass arbitrary data to  the  callback  function.
       The  last  entry	 in  dtab  should contain NULL values for src, cb, and

       defaults contains a list of default sources to try in  the  case	 of  a
       missing or corrupt nsswitch.conf(5), or if there isn't a relevant entry
       for database.  It is an array of ns_src structures, which have the fol‐
       lowing format:

       typedef struct {
			  const char *src;
			  u_int32_t flags;
			     } ns_src;

       For  each default source type, an entry with src set to the name of the
       source, and flags set to the relevant flags (usually  NS_SUCCESS; refer
       to  Callback  return  values for more information).	      The last
       entry in defaults should have src set to NULL and flags set to 0.

       For convenience, a global variable  defined  as:	 extern	 const	ns_src
       __nsdefaultsrc[];   exists  which  contains  a single default entry for
       `files' for use by callers  which  don't	 require  complicated  default

       `...' are optional extra arguments, which are passed to the appropriate
       callback function as a variable argument list of the type va_list.

   Valid Source Types
       Whilst there is support for arbitrary sources, the  following  #defines
       for commonly implemented sources are available:

       #define			   value
		  NSSRC_FILES  "files"
		  NSSRC_DNS    "dns"
		  NSSRC_NIS    "nis"
		  NSSRC_COMPAT "compat"

       Refer  to  nsswitch.conf(5)  for	 a  complete  description of what each
       source type is.

   Callback Return Values
       The callback functions  should  return  one  of	the  following	values
       depending upon status of the lookup:

		  Return value	 Status code
		  NS_SUCCESS	 success
		  NS_NOTFOUND	 notfound
		  NS_UNAVAIL	 unavail
		  NS_TRYAGAIN	 tryagain

       Refer  to  nsswitch.conf(5)  for	 a  complete  description of what each
       source type is.

       Statements about third-party trademarks, copyrights, documentation dis‐
       tribution  rights, and so forth go here if these statements must appear
       in formatted output.

       Functions:stdarg(3), ypclnt(3)

       Others: nsswitch.conf(5)


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