NAME | | DESCRIPTION | FILES | DIAGNOSTICS | ATTRIBUTES | SEE ALSO
#include <netdb.h>struct servent * getservent(void);
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:
The official name of the service.
A zero-terminated list of alternate names for the service.
The port number at which the service resides. Port numbers are returned in network byte order.
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.
/etc/services
Null pointer ( 0 ) returned on EOF or error.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
---|---|
Interface Stability | Evolving |
NAME | | DESCRIPTION | FILES | DIAGNOSTICS | ATTRIBUTES | SEE ALSO