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GETNETENT_R(3)		   Linux Programmer's Manual		GETNETENT_R(3)

       getnetent_r,  getnetbyname_r, getnetbyaddr_r - get network entry (reen‐

       #include <netdb.h>

       int getnetent_r(struct netent *result_buf, char *buf,
		       size_t buflen, struct netent **result,
		       int *h_errnop);

       int getnetbyname_r(const char *name,
		       struct netent *result_buf, char *buf,
		       size_t buflen, struct netent **result,
		       int *h_errnop);

       int getnetbyaddr_r(uint32_t net, int type,
		       struct netent *result_buf, char *buf,
		       size_t buflen, struct netent **result,
		       int *h_errnop);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getnetent_r(), getnetbyname_r(), getnetbyaddr_r(): _BSD_SOURCE ||

       The getnetent_r(), getnetbyname_r(), and getnetbyaddr_r() functions are
       the reentrant equivalents  of,  respectively,  getnetent(3),  getnetby‐
       name(3), and getnetbynumber(3).	They differ in the way that the netent
       structure is returned, and in the function calling signature and return
       value.	This  manual page describes just the differences from the non-
       reentrant functions.

       Instead of returning a pointer to a statically allocated netent	struc‐
       ture  as	 the  function result, these functions copy the structure into
       the location pointed to by result_buf.

       The buf array is used to store the string  fields  pointed  to  by  the
       returned netent structure.  (The non-reentrant functions allocate these
       strings in static storage.)  The size of this  array  is	 specified  in
       buflen.	If buf is too small, the call fails with the error ERANGE, and
       the caller must try again with a larger buffer.	(A  buffer  of	length
       1024 bytes should be sufficient for most applications.)

       If  the	function  call	successfully  obtains  a  network record, then
       *result is set pointing to result_buf; otherwise,  *result  is  set  to

       The  buffer  pointed  to	 by  h_errnop is used to return the value that
       would be stored in the global variable  h_errno	by  the	 non-reentrant
       versions of these functions.

       On  success, these functions return 0.  On error, a positive error num‐
       ber is returned.

       On error, record not found (getnetbyname_r(), getnetbyaddr_r()), or end
       of input (getnetent_r()) result is set to NULL.

       ENOENT (getnetent_r()) No more records in database.

       ERANGE buf is too small.	 Try again with a larger buffer (and increased

       These functions are GNU extensions.  Functions with similar names exist
       on  some	 other systems, though typically with different calling signa‐

       getnetent(3), networks(5)

       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2009-02-21			GETNETENT_R(3)

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