1994-08-07 18:36:12 +00:00
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.\" @(#)bindresvport.3n 2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI
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1996-12-21 22:56:48 +00:00
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.Dd "22 november 1987"
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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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.Ndbind a socket to a privileged IP port
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <netinet/in.h>
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.Ft int
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1996-12-30 14:12:36 +00:00
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.Fn bindresvport "int sd" "struct sockaddr_in **sin"
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1996-12-21 22:56:48 +00:00
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.Sh DESCRIPTION
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.Nm Bindresvport
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1994-08-07 18:36:12 +00:00
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is used to bind a socket descriptor to a privileged
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1996-12-30 14:12:36 +00:00
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.Tn IP
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1994-08-07 18:36:12 +00:00
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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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1996-12-21 22:56:48 +00:00
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otherwise -1 is returned and
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.Va errno
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1994-08-07 18:36:12 +00:00
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set to reflect the cause of the error.
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1996-12-21 22:56:48 +00:00
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.Pp
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1994-08-07 18:36:12 +00:00
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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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1996-12-30 14:12:36 +00:00
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.Pp
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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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