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BINDRESVPORT(3)          BSD Library Functions Manual          BINDRESVPORT(3)

NAME
     bindresvport -- bind a socket to a privileged IP port

SYNOPSIS
     #include <sys/types.h>
     include <netinet/in.h>

     int
     bindresvport(int sd, struct sockaddr_in **sin);

DESCRIPTION
     bindresvport() is used to bind a socket descriptor to a privileged 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 errno set to
     reflect the cause of the error.

     Only root can bind to a privileged port; this call will fail for any other users.

BSD                            November 22, 1987                           BSD