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>GETSERVENT(3)           System Library Functions Manual          GETSERVENT(3)
 
NAME
     getservent, getservbyport, getservbyname, setservent, endservent - get
     service entry
 
SYNOPSIS
     #include &lt;netdb.h&#62;
 
     struct servent *
     getservent(void);
 
     struct servent *
     getservbyname(char *name, char *proto);
 
     struct servent *
     getservbyport(int port, char *proto);
 
     void
     setservent(int stayopen);
 
     void
     endservent(void);
 
DESCRIPTION
     The getservent(), getservbyname(), and getservbyport() functions each
     return a pointer to an object with the following structure containing the
     broken-out fields of a line in the network services database,
     /etc/services.
 
           struct  servent {
                   char    *s_name;        /* official name of service */
                   char    **s_aliases;    /* alias list */
                   int     s_port;         /* port service resides at */
                   char    *s_proto;       /* protocol to use */
           };
 
     The members of this structure are:
 
     s_name     The official name of the service.
 
     s_aliases  A zero-terminated list of alternate names for the service.
 
     s_port     The port number at which the service resides.  Port numbers
                are returned in network byte order.
 
     s_proto    The name of the protocol to use when contacting the service.
 
     The getservent() function reads the next line of the file, opening the
     file if necessary.
 
     The setservent() function opens and rewinds the file.  If the stayopen
     flag is non-zero, the net database will not be closed after each call to
     getservbyname() or getservbyport().
 
     The endservent() function closes the file.
 
     The getservbyname() and getservbyport() functions sequentially search
     from the beginning of the file until a matching protocol name or port
     number (specified in network byte order) is found, or until EOF is
     encountered.  If a protocol name is also supplied (non-null), searches
     must also match the protocol.
 
FILES
     /etc/services
 
DIAGNOSTICS
     Null pointer (0) returned on EOF or error.
 
SEE ALSO
     getprotoent(3), services(5)
 
HISTORY
     The getservent(), getservbyport(), getservbyname(), setservent(), and
     endservent() functions appeared in 4.2BSD.
 
BUGS
     These functions use static data storage; if the data is needed for future
     use, it should be copied before any subsequent calls overwrite it.
     Expecting port numbers to fit in a 32-bit quantity is probably naive.
 
BSD                            January 12, 1994                            BSD
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3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
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85			`NAME="NET-COMMON-TCPIP-MANPAGES-GETSERVENT">getservent</H1`
86			`><TABLE`
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88			`BGCOLOR="#E0E0F0"`
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93			`CLASS="SCREEN"`
94			`>GETSERVENT(3) System Library Functions Manual GETSERVENT(3)`
95
96			`NAME`
97			`getservent, getservbyport, getservbyname, setservent, endservent - get`
98			`service entry`
99
100			`SYNOPSIS`
101			`#include <netdb.h>`
102
103			`struct servent *`
104			`getservent(void);`
105
106			`struct servent *`
107			`getservbyname(char name, char proto);`
108
109			`struct servent *`
110			`getservbyport(int port, char *proto);`
111
112			`void`
113			`setservent(int stayopen);`
114
115			`void`
116			`endservent(void);`
117
118			`DESCRIPTION`
119			`The getservent(), getservbyname(), and getservbyport() functions each`
120			`return a pointer to an object with the following structure containing the`
121			`broken-out fields of a line in the network services database,`
122			`/etc/services.`
123
124			`struct servent {`
125			`char s_name; / official name of service */`
126			`char *s_aliases; / alias list */`
127			`int s_port; /* port service resides at */`
128			`char s_proto; / protocol to use */`
129			`};`
130
131			`The members of this structure are:`
132
133			`s_name The official name of the service.`
134
135			`s_aliases A zero-terminated list of alternate names for the service.`
136
137			`s_port The port number at which the service resides. Port numbers`
138			`are returned in network byte order.`
139
140			`s_proto The name of the protocol to use when contacting the service.`
141
142			`The getservent() function reads the next line of the file, opening the`
143			`file if necessary.`
144
145			`The setservent() function opens and rewinds the file. If the stayopen`
146			`flag is non-zero, the net database will not be closed after each call to`
147			`getservbyname() or getservbyport().`
148
149			`The endservent() function closes the file.`
150
151			`The getservbyname() and getservbyport() functions sequentially search`
152			`from the beginning of the file until a matching protocol name or port`
153			`number (specified in network byte order) is found, or until EOF is`
154			`encountered. If a protocol name is also supplied (non-null), searches`
155			`must also match the protocol.`
156
157			`FILES`
158			`/etc/services`
159
160			`DIAGNOSTICS`
161			`Null pointer (0) returned on EOF or error.`
162
163			`SEE ALSO`
164			`getprotoent(3), services(5)`
165
166			`HISTORY`
167			`The getservent(), getservbyport(), getservbyname(), setservent(), and`
168			`endservent() functions appeared in 4.2BSD.`
169
170			`BUGS`
171			`These functions use static data storage; if the data is needed for future`
172			`use, it should be copied before any subsequent calls overwrite it.`
173			`Expecting port numbers to fit in a 32-bit quantity is probably naive.`
174
175			`BSD January 12, 1994 BSD`
176			`</PRE`
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