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Function getservbyport

Get service information from a port number and a protocol name.

struct servent { 
   const char *   s_name;     // official name of the service 
   const char * * s_aliases;  // alternative names (will be NULL) 
   int            s_port;     // port number in network byte order 
   const char *   s_proto;    // name of the protocol 
}; 

struct servent * getservbyport(int port, char * proto);

Parameters

port

Port number of service to query (e.g. 80 for www or 21 for ftp, etc).

proto

Pointer to protocol name (e.g. "tcp", "udp").

return value

Returns a pointer to a servent structure if successful, otherwise NULL. If an error occurred, call xn_getlasterror and xn_geterror_string to return the error value. Section Error Codes further describes each error. Possible values for this function are:

Socket API

Function getservbyname

Function getsockname