303 lines
5.8 KiB
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303 lines
5.8 KiB
HTML
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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</TITLE>
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</HEAD><BODY>
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<H1>GETNETENT</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, getnetbyname, getnetbyaddr, setnetent, endnetent -
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get network entry
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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>struct netent *getnetent(void);</B>
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<B>struct netent *getnetbyname(const char *</B><I>name</I><B>);</B>
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<B>struct netent *getnetbyaddr(uint32_t </B><I>net</I><B>, int </B><I>type</I><B>);</B>
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<B>void setnetent(int </B><I>stayopen</I><B>);</B>
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<B>void endnetent(void);</B>
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</PRE>
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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</B>()
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function reads the next entry from the networks database
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and returns a
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<I>netent</I>
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structure containing
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the broken-out fields from the entry.
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A connection is opened to the database if necessary.
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<P>
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The
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<B>getnetbyname</B>()
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function returns a
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<I>netent</I>
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structure
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for the entry from the database
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that matches the network
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<I>name</I>.
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<P>
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The
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<B>getnetbyaddr</B>()
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function returns a
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<I>netent</I>
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structure
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for the entry from the database
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that matches the network number
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<I>net</I>
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of type
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<I>type</I>.
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The
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<I>net</I>
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argument must be in host byte order.
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<P>
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The
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<B>setnetent</B>()
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function opens a connection to the database,
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and sets the next entry to the first entry.
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If
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<I>stayopen</I>
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is nonzero,
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then the connection to the database
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will not be closed between calls to one of the
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<B>getnet*</B>()
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functions.
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<P>
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The
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<B>endnetent</B>()
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function closes the connection to the database.
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<P>
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The
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<I>netent</I>
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structure is defined in
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<I><<A HREF="file:///usr/include/netdb.h">netdb.h</A>></I>
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as follows:
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<P>
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struct netent {
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<BR> char *n_name; /* official network name */
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<BR> char **n_aliases; /* alias list */
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<BR> int n_addrtype; /* net address type */
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<BR> uint32_t n_net; /* network number */
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}
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<P>
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The members of the
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<I>netent</I>
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structure are:
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<DL COMPACT>
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<DT id="1"><I>n_name</I>
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<DD>
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The official name of the network.
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<DT id="2"><I>n_aliases</I>
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<DD>
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A NULL-terminated list of alternative names for the network.
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<DT id="3"><I>n_addrtype</I>
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<DD>
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The type of the network number; always
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<B>AF_INET</B>.
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<DT id="4"><I>n_net</I>
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<DD>
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The network number in host byte order.
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</DL>
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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The
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<B>getnetent</B>(),
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<B>getnetbyname</B>()
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and
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<B>getnetbyaddr</B>()
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functions return a pointer to a
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statically allocated
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<I>netent</I>
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structure, or a null pointer if an
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error occurs or the end of the file is reached.
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<A NAME="lbAF"> </A>
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<H2>FILES</H2>
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<DL COMPACT>
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<DT id="5"><I>/etc/networks</I>
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<DD>
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networks database file
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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</B>()
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</TD><TD>Thread safety</TD><TD>
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MT-Unsafe race:netent
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<BR>
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race:netentbuf env locale
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>getnetbyname</B>()
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</TD><TD>Thread safety</TD><TD>
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MT-Unsafe race:netbyname
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<BR>
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env locale
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>getnetbyaddr</B>()
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</TD><TD>Thread safety</TD><TD>
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MT-Unsafe race:netbyaddr
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<BR>
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locale
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>setnetent</B>(),
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<BR>
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<B>endnetent</B>()
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</TD><TD>Thread safety</TD><TD>
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MT-Unsafe race:netent env
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<BR>
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locale
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<BR></TD></TR>
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</TABLE>
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<P>
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In the above table,
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<I>netent</I>
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in
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<I>race:netent</I>
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signifies that if any of the functions
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<B>setnetent</B>(),
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<B>getnetent</B>(),
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or
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<B>endnetent</B>()
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are used in parallel in different threads of a program,
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then data races could occur.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, 4.3BSD.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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In glibc versions before 2.2, the
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<I>net</I>
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argument of
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<B>getnetbyaddr</B>()
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was of type
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<I>long</I>.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+getnetent_r">getnetent_r</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+getprotoent">getprotoent</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+getservent">getservent</A></B>(3)
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<BR>
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RFC 1101
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<A NAME="lbAK"> </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="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="8"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="9"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="10"><A HREF="#lbAF">FILES</A><DD>
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<DT id="11"><A HREF="#lbAG">ATTRIBUTES</A><DD>
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<DT id="12"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="14"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="15"><A HREF="#lbAK">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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