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CentOS 7.0 - man page for ipsec_setportof (centos section 3)

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IPSEC_PORTOF(3) 								  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 prin-
       ciple subject to change.  Avoid using them unless really necessary.

					   8 Sept 2000				  IPSEC_PORTOF(3)
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