getservent(3POSIX)

NAME | | DESCRIPTION | FILES | DIAGNOSTICS | ATTRIBUTES | SEE ALSO

NAME

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

#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() , getservbyname() , 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 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 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 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 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.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

getprotoent(3POSIX) , services(4CC)

NAME | | DESCRIPTION | FILES | DIAGNOSTICS | ATTRIBUTES | SEE ALSO