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



NAME
       getnetent_r, getnetbyname_r, getnetbyaddr_r - get network entry (reentrant)

SYNOPSIS
       #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 || _SVID_SOURCE

DESCRIPTION
       The  getnetent_r(),  getnetbyname_r(), and getnetbyaddr_r() functions are the reentrant equivalents of, respec-
       tively, getnetent(3), getnetbyname(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 dif-
       ferences from the non-reentrant functions.

       Instead of returning a pointer to a statically allocated netent structure as the function result,  these  func-
       tions 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-reen-
       trant 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;  other-
       wise, *result is set to NULL.

       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.

RETURN VALUE
       On success, these functions return 0.  On error, a positive error number is returned.

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

ERRORS
       ENOENT (getnetent_r()) 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 signatures.

SEE ALSO
       getnetent(3), networks(5)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2009-02-21                    GETNETENT_R(3)