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242 lines
5.8 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of GETNETENT_R</TITLE>
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</HEAD><BODY>
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<H1>GETNETENT_R</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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getnetent_r, getnetbyname_r, getnetbyaddr_r - get
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network entry (reentrant)
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/netdb.h">netdb.h</A>></B>
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<B>int getnetent_r(struct netent *</B><I>result_buf</I><B>, char *</B><I>buf</I><B>,</B>
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<B> size_t </B><I>buflen</I><B>, struct netent **</B><I>result</I><B>,</B>
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<B> int *</B><I>h_errnop</I><B>);</B>
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<B>int getnetbyname_r(const char *</B><I>name</I><B>,</B>
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<B> struct netent *</B><I>result_buf</I><B>, char *</B><I>buf</I><B>,</B>
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<B> size_t </B><I>buflen</I><B>, struct netent **</B><I>result</I><B>,</B>
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<B> int *</B><I>h_errnop</I><B>);</B>
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<B>int getnetbyaddr_r(uint32_t </B><I>net</I><B>, int </B><I>type</I><B>,</B>
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<B> struct netent *</B><I>result_buf</I><B>, char *</B><I>buf</I><B>,</B>
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<B> size_t </B><I>buflen</I><B>, struct netent **</B><I>result</I><B>,</B>
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<B> int *</B><I>h_errnop</I><B>);</B>
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</PRE>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>getnetent_r</B>(),
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<B>getnetbyname_r</B>(),
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<B>getnetbyaddr_r</B>():
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<BR> Since glibc 2.19:
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<BR> _DEFAULT_SOURCE
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<BR> Glibc 2.19 and earlier:
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<BR> _BSD_SOURCE || _SVID_SOURCE
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>getnetent_r</B>(),
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<B>getnetbyname_r</B>(),
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and
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<B>getnetbyaddr_r</B>()
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functions are the reentrant equivalents of, respectively,
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<B><A HREF="/cgi-bin/man/man2html?3+getnetent">getnetent</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+getnetbyname">getnetbyname</A></B>(3),
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and
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<B><A HREF="/cgi-bin/man/man2html?3+getnetbynumber">getnetbynumber</A></B>(3).
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They differ in the way that the
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<I>netent</I>
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structure is returned,
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and in the function calling signature and return value.
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This manual page describes just the differences from
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the nonreentrant functions.
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<P>
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Instead of returning a pointer to a statically allocated
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<I>netent</I>
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structure as the function result,
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these functions copy the structure into the location pointed to by
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<I>result_buf</I>.
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<P>
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The
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<I>buf</I>
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array is used to store the string fields pointed to by the returned
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<I>netent</I>
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structure.
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(The nonreentrant functions allocate these strings in static storage.)
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The size of this array is specified in
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<I>buflen</I>.
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If
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<I>buf</I>
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is too small, the call fails with the error
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<B>ERANGE</B>,
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and the caller must try again with a larger buffer.
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(A buffer of length 1024 bytes should be sufficient for most applications.)
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<P>
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If the function call successfully obtains a network record, then
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<I>*result</I>
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is set pointing to
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<I>result_buf</I>;
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otherwise,
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<I>*result</I>
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is set to NULL.
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<P>
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The buffer pointed to by
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<I>h_errnop</I>
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is used to return the value that would be stored in the global variable
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<I>h_errno</I>
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by the nonreentrant versions of these functions.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, these functions return 0.
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On error, they return one of the positive error numbers listed in ERRORS.
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<P>
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On error, record not found
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(<B>getnetbyname_r</B>(),
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<B>getnetbyaddr_r</B>()),
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or end of input
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(<B>getnetent_r</B>())
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<I>result</I>
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is set to NULL.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>ENOENT</B>
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<DD>
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(<B>getnetent_r</B>())
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No more records in database.
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<DT id="2"><B>ERANGE</B>
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<DD>
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<I>buf</I>
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is too small.
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Try again with a larger buffer
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(and increased
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<I>buflen</I>).
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</DL>
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<A NAME="lbAG"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>getnetent_r</B>(),
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<B>getnetbyname_r</B>(),
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<B>getnetbyaddr_r</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe locale<BR></TD></TR>
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</TABLE>
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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These functions are GNU extensions.
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Functions with similar names exist on some other systems,
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though typically with different calling signatures.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+getnetent">getnetent</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?5+networks">networks</A></B>(5)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="3"><A HREF="#lbAB">NAME</A><DD>
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<DT id="4"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="5"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="6"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="7"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="8"><A HREF="#lbAG">ATTRIBUTES</A><DD>
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<DT id="9"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="10"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="11"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:44 GMT, March 31, 2021
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