NAME
bindresvport() — bind socket to privileged IP port
SYNOPSIS
#include <sys/types.h>
#include <netinet/in.h>
int bindresvport(int sd, struct sockaddr_in *sin);
DESCRIPTION
The
bindresvport()
function binds a socket descriptor to a privileged IP port;
that is, a port number in the range 0 to 1023.
sd
is a socket descriptor that was previously defined by a successful call to
socket()
(see
socket(2)).
Upon successful completion of
bindresvport(),
the
sin_port
field in the
struct
pointed to by
sin
contains the number of the privileged port bound to the
sd
socket.
Due to the need to protect the port numbers
used by various networking commands,
bindresvport()
only returns a port number within a smaller subrange
in the range of 0 to 1023.
Only superuser
can bind to a privileged port.
RETURN VALUE
bindresvport()
returns the following values:
- 0
Successful completion.
- -1
Failure.
errno
is set to indicate the error.
ERRORS
If
bindresvport()
fails,
errno
is set to one of the following values:
- [EACCES]
The requested address is protected,
and the current user has inadequate permission to access it.
- [EADDRINUSE]
The specified address is already in use.
- [EADDRNOTAVAIL]
The specified address is bad or not available from the local machine.
- [EAFNOSUPPORT]
Requested address does not match the address family of this socket.
- [EBADF]
sd
is not a valid descriptor.
- [EINVAL]
The socket is already bound to an address,
or the socket has been shut down.
- [ENOBUFS]
Insufficient buffer memory is available.
- [ENOTSOCK]
sd
is not a socket.
- [EOPNOTSUPP]
The socket whose descriptor is
sd
is of a type that does not support address binding.
- [EPFNOSUPPORT]
The value specified in the
sin_family
field of the
sockaddr_in
struct was not
AF_INET.
AUTHOR
bindresvport()
was developed by Sun Microsystems, Inc.
