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f11a166425
Updated date. 1987 was a while ago. Removed trailing comma in NAME section. Uncapitalised Bindresvport and Bindresvport_sa in DESCRIPTION section. Don't use .Nm there either. Added bindresvport_sa() to the RETURN VALUES and ERROR sections.
107 lines
2.5 KiB
Groff
107 lines
2.5 KiB
Groff
.\" @(#)bindresvport.3n 2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI
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.\" $FreeBSD$
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.\"
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.Dd January 27, 2000
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.Dt BINDRESVPORT 3
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.Os
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.Sh NAME
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.Nm bindresvport ,
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.Nm bindresvport_sa
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.Ndbind a socket to a privileged IP port
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.Sh SYNOPSIS
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.Fd #include <rpc/rpc.h>
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.Ft int
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.Fn bindresvport "int sd" "struct sockaddr_in *sin"
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.Ft int
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.Fn bindresvport_sa "int sd" "struct sockaddr *sa"
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.Sh DESCRIPTION
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.Fn bindresvport
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and
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.Fn bindresvport_sa
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are used to bind a socket descriptor to a privileged
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.Tn IP
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port, that is, a
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port number in the range 0-1023.
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.Pp
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Only root can bind to a privileged port; this call will fail for any
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other users.
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.Pp
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When
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.Va sin
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is not null,
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.Va sin->sin_family
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must be initialized to the address family of the socket, passed by
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.Va sd .
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If the value of sin->sin_port is non-zero
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.Fn bindresvport
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will attempt to use that specific port. If it fails, it chooses another
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privileged port automatically.
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.Pp
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It is legal to pass null pointer to
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.Va sin .
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In this case, the caller cannot get the port number
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.Fn bindresvport
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has picked.
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.Pp
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Function prototype of
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.Fn bindresvport
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is biased to
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.Dv AF_INET
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socket.
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.Fn bindresvport_sa
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acts exactly the same, with more neutral function prototype.
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Note that both functions behave exactly the same, and
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both support
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.Dv AF_INET6
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sockets as well as
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.Dv AF_INET
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sockets.
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.Sh RETURN VALUES
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.Fn bindresvport
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and
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.Fn bindresvport_sa
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return 0 if they are successful, otherwise \-1 is returned and
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.Va errno
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set to reflect the cause of the error.
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.Sh ERRORS
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The
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.Fn bindresvport
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and
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.Fn bindresvport_sa
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functions fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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.Fa sd
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is not a valid descriptor.
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.It Bq Er ENOTSOCK
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.Fa sd
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is not a socket.
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.It Bq Er EADDRNOTAVAIL
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The specified address is not available from the local machine.
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.It Bq Er EADDRINUSE
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The specified address is already in use.
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.It Bq Er EINVAL
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The socket is already bound to an address,
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or the socket family and the family of specified address mismatch.
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.It Bq Er EACCES
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The requested address is protected, and the current user
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has inadequate permission to access it.
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.It Bq Er EFAULT
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The
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.Fa name
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parameter is not in a valid part of the user
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address space.
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.It Bq Er ENOBUFS
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Insufficient resources were available in the system
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to perform the operation.
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.It Bq Er EPFNOSUPPORT
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The protocol family has not been configured into the
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system, no implementation for it exists,
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or address family did not match between arguments.
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.El
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.Sh "SEE ALSO"
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.Xr bind 2 ,
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.Xr socket 2 ,
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.Xr rresvport 3 ,
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.Xr rresvport_af 3
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