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BINDRESVPORT(3)	       FreeBSD Library Functions Manual	       BINDRESVPORT(3)

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

LIBRARY
     Standard C	Library	(libc, -lc)

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

     If	sin is the NULL	pointer, an anonymous port will	be allocated (as
     above).  However, there is	no way for bindresvport() to return the	allo-
     cated 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 func-
     tion prototype.  Note that	both functions behave exactly the same,	and
     both support AF_INET6 sockets as well as AF_INET sockets.

RETURN VALUES
     The bindresvport()	function returns the value 0 if	successful; otherwise
     the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS
     [EPFNOSUPPORT]	If second argument was supplied, and address family
			did not	match between arguments.

     The bindresvport()	function may also fail and set errno for any of	the
     errors specified for the calls bind(2), getsockopt(2), or setsockopt(2).

SEE ALSO
     bind(2), getsockopt(2), setsockopt(2), ip(4)

FreeBSD	11.2		       November	22, 1987		  FreeBSD 11.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO

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