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

NAME
       getnetentr,  getnetbynamer, getnetbyaddrr - get network entry (reen‐
       trant)

SYNOPSIS
       #include 

       int getnetentr(struct netent *resultbuf, char *buf,
                       sizet buflen, struct netent **result,
                       int *herrnop);

       int getnetbynamer(const char *name,
                       struct netent *resultbuf, char *buf,
                       sizet buflen, struct netent **result,
                       int *herrnop);

       int getnetbyaddrr(uint32t net, int type,
                       struct netent *resultbuf, char *buf,
                       sizet buflen, struct netent **result,
                       int *herrnop);

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

       getnetentr(), getnetbynamer(), getnetbyaddrr():
           BSDSOURCE || SVIDSOURCE

DESCRIPTION
       The getnetentr(), getnetbynamer(), and getnetbyaddrr() 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 resultbuf.

       The  buf  array  is  used  to store the string fields pointed to by the
       returned netent structure.  (The nonreentrant 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 resultbuf; otherwise, *result is set to
       NULL.

       The buffer pointed to by herrnop is used  to  return  the  value  that
       would be stored in the global variable herrno by the nonreentrant ver‐
       sions of these functions.

RETURN VALUE
       On success, these functions return 0.  On error, they return one of the
       positive error numbers listed in ERRORS.

       On error, record not found (getnetbynamer(), getnetbyaddrr()), or end
       of input (getnetentr()) result is set to NULL.

ERRORS
       ENOENT (getnetentr()) No more records in database.

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

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

SEE ALSO
       getnetent(3), networks(5)

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               2010-09-10                    GETNETENTR(3)