centos man page for ipsec_portof

IPSEC_PORTOF(3) 					     Library Functions Manual						   IPSEC_PORTOF(3)

NAME
       ipsec_portof,  ipsec_setportof,	ipsec_sockaddrof,  ipsec_sockaddrlenof - get port field of an ip_address, set port field of an ip_address,
       get pointer to internal sockaddr of an ip_address, get length of internal sockaddr of an ip_address

SYNOPSIS
       #include <libreswan.h>

       int portof(const ip_address *src);
       void setportof(int port, ip_address *dst);
       struct sockaddr *sockaddrof(ip_address *src);
       size_t sockaddrlenof(const ip_address *src);

DESCRIPTION
       The <libreswan.h> internal type ip_address contains one of the sockaddr types internally.  Reliance on this feature is discouraged, but	it
       may occasionally be necessary.  These functions provide low-level tools for this purpose.

       Portof and setportof respectively read and write the port-number field of the internal sockaddr.  The values are in network byte order.

       Sockaddrof returns a pointer to the internal sockaddr, for passing to other functions.

       Sockaddrlenof reports the size of the internal sockaddr, for use in storage allocation.

SEE ALSO
       inet(3), ipsec_initaddr(3)

DIAGNOSTICS
       Portof returns -1, sockaddrof returns NULL, and sockaddrlenof returns 0 if an unknown address family is found within the ip_address.

HISTORY
       Written for the FreeS/WAN project by Henry Spencer.

BUGS
       These  functions all depend on low-level details of the ip_address type, which are in principle subject to change.  Avoid using them unless
       really necessary.

								    8 Sept 2000 						   IPSEC_PORTOF(3)