| BINDRESVPORT(3) | Library Functions Manual | BINDRESVPORT(3) | 
bindresvport, bindresvport_sa
  —
#include <sys/types.h>
#include <rpc/rpc.h>
int
  
  bindresvport(int
    sd, struct sockaddr_in
    *sin);
int
  
  bindresvport_sa(int
    sd, struct sockaddr
    *sa);
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.
EPFNOSUPPORT]bindresvport() may also fail and set
    errno for any of the errors specified for the calls
    bind(2),
    getsockopt(2), or
    setsockopt(2).
| January 27, 2007 | NetBSD 9.3 |