.\" from: @(#)bindresvport.3n 2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI .\" $Id: bindresvport.3,v 1.1 1999/04/13 23:15:36 wsanchez Exp $ .\" .Dd November 22, 1987 .Dt BINDRESVPORT 3 .Os .Sh NAME .Nm bindresvport .Nd bind a socket to a privileged IP port .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd include <netinet/in.h> .Ft int .Fn bindresvport "int sd" "struct sockaddr_in **sin" .Sh DESCRIPTION .Fn bindresvport is used to bind a socket descriptor to a privileged .Tn IP port, that is, a port number in the range 0-1023. The routine returns 0 if it is successful, otherwise -1 is returned and .Va errno set to reflect the cause of the error. .Pp Only root can bind to a privileged port; this call will fail for any other users.