bindresvport(3R)                  SDK R4.11                 bindresvport(3R)


NAME
       bindresvport - bind a socket to a privileged IP port

SYNOPSIS
       #include <sys/types.h>
       #include <netinet/in.h>

       int bindresvport(sd, sin)
       int sd;
       struct sockaddrin *sin;

DESCRIPTION
       Bindresvport(3R) is used to bind a socket descriptor to a privileged
       Internet Protocol (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 errno set to reflect the cause of the error.  This
       routine differs with rresvport (see rcmd(3X)) in that this works for
       any IP socket, whereas rresvport() only works for TCP.

       Only a user with appropriate privilege can bind to a privileged port;
       this call will fail for any other users.  For systems supporting the
       DG/UX Capability Option, appropriate privilege is defined as having
       one or more specific capabilities enabled in the effective capability
       set of the user.  See capdefaults(5) for the default capabilities
       for this command.

       On systems without the DG/UX Capability Option, appropriate privilege
       means that your process has an effective UID of root.  See the
       appropriateprivilege(5) man page for more information.

SEE ALSO
       rcmd(3X), appropriateprivilege(5).
       capdefaults(5).


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