Name

bindresvport — bind a socket to a privileged IP port

Synopsis

#include <sys/types.h>
#include <netinet/in.h>
int bindresvport( int   sd,
  struct sockaddr_in **  sin);

DESCRIPTION

bindresvport() is used to bind a socket descriptor to a privileged IP port, that is, a port number in the range 0-1023.

If in−>sin_port is 0 then an anonymous port in the range 600 to 1023 be chosen. If the bind(2) performed by bindresvport() is successful, then sin−>sin_port returns the port number actually allocated.

sin can be NULL, in which case sin−>sin_family is implicitly taken to be AF_INET, and an anonymous port is allocated (as above). However, in this case, bindresvport() has no way to return the port number actually allocated.

RETURN VALUE

bindresvport() returns 0 if it is successful, otherwise −1 is returned and errno set to indicate the cause of the error.

ERRORS

bindresvport() can fail for any of the same reasons as bind(2).

CONFORMING TO

Not in POSIX.1-2001. Present on the BSDs, Solaris, and many other systems.

NOTES

Only root can bind to a privileged port; this call will fail for any other users. In addition, the following error may occur:

EPFNOSUPPORT

sin is not NULL and sin−>sin_family is not AF_INET.

SEE ALSO

bind(2)

COLOPHON

This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  This page was initially taken from the 4.4BSD-Lite CDROM (BSD license)
with substantial updates
Copyright (C) 2007, Michael Kerrisk <mtk.manpagesgmail.com>

(#)bindresvport.3n 2.2 88/08/02 4.0 RPCSRC; from 1.7 88/03/14 SMI

2007-05-31, mtk: Rewrite and substantial additional text.