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GETSERVENT(3) Linux Programmer's Manual GETSERVENT(3)
NAME
getservent, getservbyname, getservbyport, setservent, endservent - get
service entry
SYNOPSIS
#include <netdb.h>
struct servent *getservent(void);
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() function reads the next line from the file /etc/ser
vices and returns a structure servent containing the broken out fields
from the line. The /etc/services file is opened if necessary.
The getservbyname() function returns a servent structure for the line
from /etc/services that matches the service name using protocol proto.
If proto is NULL, any protocol will be matched.
The getservbyport() function returns a servent structure for the line
that matches the port port given in network byte order using protocol
proto. If proto is NULL, any protocol will be matched.
The setservent() function opens and rewinds the /etc/services file. If
stayopen is true (1), then the file will not be closed between calls to
getservbyname() and getservbyport().
The endservent() function closes /etc/services.
The servent structure is defined in <netdb.h> as follows:
struct servent {
char *s_name; /* official service name */
char **s_aliases; /* alias list */
int s_port; /* port number */
char *s_proto; /* protocol to use */
}
The members of the servent structure are:
s_name The official name of the service.
s_aliases
A zero terminated list of alternative names for the service.
s_port The port number for the service given in network byte order.
s_proto
The name of the protocol to use with this service.
RETURN VALUE
The getservent(), getservbyname() and getservbyport() functions return
the servent structure, or a NULL pointer if an error occurs or the end
of the file is reached.
FILES
/etc/services
services database file
CONFORMING TO
4.3BSD
SEE ALSO
getnetent(3), getprotoent(3), services(5)
BSD 2001-07-25 GETSERVENT(3)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:18:14 GMT 2007
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