getservent, getservbyname, getservbyport, setservent, end
servent - 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/services and returns a structure servent con
taining 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/ser
vices file. If stayopen is true (1), then the file will
not be closed between calls to getservbyname() and get
servbyport().
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.
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
BSD 4.3
SEE ALSO
getprotoent(3), getnetent(3), services(5)
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