Manpage of GETNETENT_R

GETNETENT_R

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

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():
    Since glibc 2.19:
        _DEFAULT_SOURCE
    Glibc 2.19 and earlier:
        _BSD_SOURCE || _SVID_SOURCE  

DESCRIPTION

The getnetent_r(), getnetbyname_r(), and getnetbyaddr_r() functions are the reentrant equivalents of, respectively, getnetent(3), getnetbyname(3), and getnetbynumber(3). They differ in the way that the netentstructure is returned, and in the function calling signature and return value. This manual page describes just the differences from the nonreentrant functions.

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

The bufarray is used to store the string fields pointed to by the returned netentstructure. (The nonreentrant functions allocate these strings in static storage.) The size of this array is specified in buflen. If bufis 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 *resultis set pointing to result_buf; otherwise, *resultis set to NULL.

The buffer pointed to by h_errnopis used to return the value that would be stored in the global variable h_errnoby the nonreentrant versions 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 (getnetbyname_r(), getnetbyaddr_r()), or end of input (getnetent_r()) resultis set to NULL.  

ERRORS

ENOENT
(getnetent_r()) No more records in database.
ERANGE
bufis too small. Try again with a larger buffer (and increased buflen).
 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
getnetent_r(), getnetbyname_r(), getnetbyaddr_r() Thread safetyMT-Safe locale

 

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:28:01 GMT, June 20, 2016