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NetBSD 6.1.5 - man page for getservbyport (netbsd section 3)

GETSERVENT(3)			   BSD Library Functions Manual 		    GETSERVENT(3)

NAME
     getservent, getservbyport, getservbyname, setservent, endservent -- get service entry

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <netdb.h>

     struct servent *
     getservent();

     struct servent *
     getservbyname(const char *name, const char *proto);

     struct servent *
     getservbyport(int port, const 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 net-
     work services data base, /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 NULL terminated list of alternative names for the service.

     s_port	The port number at which the service resides.  Port numbers must be given and 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 data base 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 is found, or until EOF is encoun-
     tered.  If a protocol name is also supplied (non-NULL), searches must also match the proto-
     col.

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					   May 25, 1995 				      BSD


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