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NetBSD 6.1.5 - man page for bindresvport (netbsd section 3)

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

NAME
     bindresvport, bindresvport_sa -- bind a socket to a reserved 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
     bindresvport() and bindresvport_sa() are used to bind a socket descriptor to a reserved
     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.

     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 a 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, a port will be allocated (as above).  However, there is no way
     for bindresvport() to return the allocated port in this case.  getsockname(2) can be used to
     determine the assigned port.

     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.	bindresvport_sa() 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.

RETURN VALUES
     If the bind is successful, a 0 value is returned.	A return value of -1 indicates an error,
     which is further specified in the global errno.

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

     bindresvport() 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), getsockname(2), getsockopt(2), setsockopt(2), ip(4)

BSD					 January 27, 2007				      BSD
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