getprotobynumber

Searches the protocols database until a matching protocol number is found or until an EOF is encountered.

#include  <netdb.h>

struct protoent *getprotobynumber  (int *proto);

This routine returns a pointer to a protoent structure containing the broken-out fields of the requested line from the protocols database.

See the <netdb.h> header file for a description of the protoent structure.

See also getprotoent and getprotobyname in this section.

NULL	Indicates EOF or an error.
x	A pointer to a protoent structure.