mirror of https://github.com/mkerrisk/man-pages
109 lines
3.5 KiB
Groff
109 lines
3.5 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 21:48:06 1993 by Rik Faith (faith@cs.unc.edu)
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.TH GETNETENT 3 1993-05-15 "BSD" "Linux Programmer's Manual"
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.SH NAME
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getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent \-
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get network entry
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.SH SYNOPSIS
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.nf
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.B #include <netdb.h>
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.sp
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.B struct netent *getnetent(void);
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.sp
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.BI "struct netent *getnetbyname(const char *" name );
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.sp
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.BI "struct netent *getnetbyaddr(long " net ", int " type );
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.sp
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.BI "void setnetent(int " stayopen );
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.sp
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.B void endnetent(void);
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.fi
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.SH DESCRIPTION
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The \fBgetnetent\fP() function reads the next line from the file
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\fI/etc/networks\fP and returns a structure \fInetent\fP containing
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the broken out fields from the line. The \fI/etc/networks\fP file
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is opened if necessary.
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.PP
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The \fBgetnetbyname\fP() function returns a \fInetent\fP structure
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for the line from \fI/etc/networks\fP that matches the network
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\fIname\fP.
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.PP
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The \fBgetnetbyaddr\fP() function returns a \fInetent\fP structure
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for the line that matches the network number \fInet\fP of type
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\fItype\fP.
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.PP
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The \fBsetnetent\fP() function opens and rewinds the
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\fI/etc/networks\fP file. If \fIstayopen\fP is true (1), then the
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file will not be closed between calls to \fBgetnetbyname\fP() and
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\fBgetnetbyaddr\fP().
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.PP
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The \fBendnetent\fP() function closes \fI/etc/networks\fP.
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.PP
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The \fInetent\fP structure is defined in \fI<netdb.h>\fP as follows:
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.sp
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.in +0.5i
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.nf
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struct netent {
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char *n_name; /* official network name */
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char **n_aliases; /* alias list */
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int n_addrtype; /* net address type */
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unsigned long n_net; /* network number */
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}
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.fi
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.in -0.5i
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.PP
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The members of the \fInetent\fP structure are:
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.TP
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.I n_name
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The official name of the network.
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.TP
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.I n_aliases
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A zero terminated list of alternative names for the network.
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.TP
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.I n_addrtype
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The type of the network number; always AF_INET.
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.TP
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.I n_net
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The network number in host byte order.
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.SH "RETURN VALUE"
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The \fBgetnetent\fP(), \fBgetnetbyname\fP() and \fBgetnetbyaddr\fP()
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functions return the \fInetent\fP 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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.SH FILES
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.TP
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.I /etc/networks
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networks database file
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.SH "CONFORMING TO"
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4.3BSD, POSIX.1-2001.
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.SH "SEE ALSO"
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.BR getprotoent (3),
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.BR getservent (3),
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.BR networks (5)
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.br
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RFC\ 1101
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