| .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
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| .\" permission notice identical to this one. |
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| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
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| .\" Formatted or processed versions of this manual, if unaccompanied by |
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| .\" References consulted: |
| .\" Linux libc source code |
| .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) |
| .\" 386BSD man pages |
| .\" Modified Sat Jul 24 21:48:06 1993 by Rik Faith (faith@cs.unc.edu) |
| .TH GETNETENT 3 1993-05-15 "BSD" "Linux Programmer's Manual" |
| .SH NAME |
| getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent \- |
| get network entry |
| .SH SYNOPSIS |
| .nf |
| .B #include <netdb.h> |
| .sp |
| .B struct netent *getnetent(void); |
| .sp |
| .BI "struct netent *getnetbyname(const char *" name ); |
| .sp |
| .BI "struct netent *getnetbyaddr(long " net ", int " type ); |
| .sp |
| .BI "void setnetent(int " stayopen ); |
| .sp |
| .B void endnetent(void); |
| .fi |
| .SH DESCRIPTION |
| The \fBgetnetent\fP() function reads the next line from the file |
| \fI/etc/networks\fP and returns a structure \fInetent\fP containing |
| the broken out fields from the line. The \fI/etc/networks\fP file |
| is opened if necessary. |
| .PP |
| The \fBgetnetbyname\fP() function returns a \fInetent\fP structure |
| for the line from \fI/etc/networks\fP that matches the network |
| \fIname\fP. |
| .PP |
| The \fBgetnetbyaddr\fP() function returns a \fInetent\fP structure |
| for the line that matches the network number \fInet\fP of type |
| \fItype\fP. |
| .PP |
| The \fBsetnetent\fP() function opens and rewinds the |
| \fI/etc/networks\fP file. If \fIstayopen\fP is true (1), then the |
| file will not be closed between calls to \fBgetnetbyname\fP() and |
| \fBgetnetbyaddr\fP(). |
| .PP |
| The \fBendnetent\fP() function closes \fI/etc/networks\fP. |
| .PP |
| The \fInetent\fP structure is defined in \fI<netdb.h>\fP as follows: |
| .sp |
| .RS |
| .nf |
| .ne 6 |
| .ta 8n 16n 34n |
| struct netent { |
| char *n_name; /* official network name */ |
| char **n_aliases; /* alias list */ |
| int n_addrtype; /* net address type */ |
| unsigned long int n_net; /* network number */ |
| } |
| .ta |
| .fi |
| .RE |
| .PP |
| The members of the \fInetent\fP structure are: |
| .TP |
| .I n_name |
| The official name of the network. |
| .TP |
| .I n_aliases |
| A zero terminated list of alternative names for the network. |
| .TP |
| .I n_addrtype |
| The type of the network number; always AF_INET. |
| .TP |
| .I n_net |
| The network number in host byte order. |
| .SH "RETURN VALUE" |
| The \fBgetnetent\fP(), \fBgetnetbyname\fP() and \fBgetnetbyaddr\fP() |
| functions return the \fInetent\fP structure, or a NULL pointer if an |
| error occurs or the end of the file is reached. |
| .SH FILES |
| .TP |
| .I /etc/networks |
| networks database file |
| .SH "CONFORMING TO" |
| 4.3BSD |
| .SH "SEE ALSO" |
| .BR getprotoent (3), |
| .BR getservent (3), |
| .BR networks (5) |
| .br |
| RFC\ 1101 |