bindresvport.3n

早期freebsd实现

.\" @(#)bindresvport.3n	2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI
.TH BINDRESVPORT 3N  "22 november 1987"
.SH NAME
bindresvport \- bind a socket to a privileged IP port
.SH SYNOPSIS
.nf
.B #include <sys/types.h>
.B #include <netinet/in.h>
.LP
.B int bindresvport(sd, sin)
.B int sd;
.B struct sockaddr_in \(**sin;
.fi
.SH DESCRIPTION
.LP
.B bindresvport(\|)
is used to bind a socket descriptor to a privileged
.SM 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
.B errno
set to reflect the cause of the error.
.LP
Only root can bind to a privileged port; this call will fail for any
other users.