Проект OpenNet: MAN bindresvport_sa (3) Библиотечные вызовы (FreeBSD и Linux)

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bindresvport_sa (3)

>> bindresvport_sa (3) ( FreeBSD man: Библиотечные вызовы )

BSD mandoc

NAME



bindresvport

 
bindresvport_sa

 - bind a socket to a privileged IP port

LIBRARY

Lb libc

SYNOPSIS

#include <sys/types.h>
#include <rpc/rpc.h>
int bindresvport (int sd struct sockaddr_in *sin);
int bindresvport_sa (int sd struct sockaddr *sa);

DESCRIPTION

The bindresvport ();
and bindresvport_sa ();
functions are used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023.

If Fa sin is a pointer to a struct sockaddr_in then the appropriate fields in the structure should be defined. Note that Fa sin->sin_family must be initialized to the address family of the socket, passed by Fa sd . If Fa sin->sin_port is `0' then an anonymous port (in the range 600-1023) will be chosen, and if bind(2) is successful, the Fa sin->sin_port will be updated to contain the allocated port.

If Fa sin is the NULL pointer, an anonymous port will be allocated (as above). However, there is no way for bindresvport ();
to return the allocated port in this case.

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

Function prototype of bindresvport ();
is biased to AF_INET socket. The bindresvport_sa ();
function acts exactly the same, with more neutral function prototype. Note that both functions behave exactly the same, and both support AF_INET6 sockets as well as AF_INET sockets.