2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
107 lines
2.3 KiB
Groff
107 lines
2.3 KiB
Groff
.\" @(#)bindresvport.3n 2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI
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.\" $NetBSD: bindresvport.3,v 1.13 2007/01/27 07:58:47 cbiere Exp $
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.\"
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.Dd January 27, 2007
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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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.Nd bind a socket to a reserved privileged IP port
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In 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 reserved 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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The routine returns 0 if it is successful,
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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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.Pp
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If
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.Fa sin
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is a pointer to a
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.Ft "struct sockaddr_in"
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then the appropriate fields in the structure should be defined.
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Note that
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.Fa sin-\*[Gt]sin_family
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must be initialized to the address family of the socket, passed by
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.Fa sd .
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If
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.Fa sin-\*[Gt]sin_port
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is
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.Sq 0
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then a port (in the range 600-1023) will be
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chosen, and if
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.Xr bind 2
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is successful, the
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.Fa sin-\*[Gt]sin_port
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will be updated to contain the allocated port.
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.Pp
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If
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.Fa sin
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is the
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.Dv NULL
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pointer,
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a port will be allocated (as above).
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However, there is no way for
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.Fn bindresvport
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to return the allocated port in this case.
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.Xr getsockname 2
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can be used to determine the assigned port.
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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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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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If the bind is successful, a 0 value is returned.
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A return value of -1 indicates an error, which is
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further specified in the global
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.Va errno .
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EPFNOSUPPORT
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If second argument was supplied,
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and address family did not match between arguments.
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.El
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.Pp
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.Fn bindresvport
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may also fail and set
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.Va errno
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for any of the errors specified for the calls
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.Xr bind 2 ,
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.Xr getsockopt 2 ,
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or
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.Xr setsockopt 2 .
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.Sh SEE ALSO
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.Xr bind 2 ,
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.Xr getsockname 2 ,
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.Xr getsockopt 2 ,
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.Xr setsockopt 2 ,
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.Xr ip 4
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