getnetpath(3) - NetBSD Manual Pages

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GETNETPATH(3)             NetBSD Programmer's Manual             GETNETPATH(3)


NAME

     getnetpath, setnetpath, endnetpath - get /etc/netconfig entry correspond-
     ing to NETPATH component


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <netconfig.h>

     struct netconfig *
     getnetpath(void *handlep);

     void *
     setnetpath(void);

     int
     endnetpath(void *handlep);


DESCRIPTION

     The routines described in this page provide the application access to the
     system network configuration database, /etc/netconfig, as it is
     ``filtered'' by the NETPATH environment variable (see environ(7)).  See
     getnetconfig(3) for other routines that also access the network configu-
     ration database directly.  The NETPATH variable is a list of colon-sepa-
     rated network identifiers.

     getnetpath() returns a pointer to the netconfig database entry corre-
     sponding to the first valid NETPATH component.  The netconfig entry is
     formatted as a struct netconfig.  On each subsequent call, getnetpath()
     returns a pointer to the netconfig entry that corresponds to the next
     valid NETPATH component.  getnetpath() can thus be used to search the
     netconfig database for all networks included in the NETPATH variable.
     When NETPATH has been exhausted, getnetpath() returns NULL.

     A call to setnetpath() ``binds'' to or ``rewinds'' NETPATH.  setnetpath()
     must be called before the first call to getnetpath() and may be called at
     any other time. It returns a handle that is used by getnetpath().

     getnetpath() silently ignores invalid NETPATH components.  A NETPATH com-
     ponent is invalid if there is no corresponding entry in the netconfig
     database.

     If the NETPATH variable is unset, getnetpath() behaves as if NETPATH were
     set to the sequence of ``default'' or ``visible'' networks in the netcon-
     fig database, in the order in which they are listed.

     endnetpath() may be called to ``unbind'' from NETPATH when processing is
     complete, releasing resources for reuse.  Programmers should be aware,
     however, that endnetpath() frees all memory allocated by getnetpath() for
     the struct netconfig data structure.


RETURN VALUES

     setnetpath() returns a handle that is used by getnetpath().  In case of
     an error, setnetpath() returns NULL.

     endnetpath() returns 0 on success and -1 on failure (for example, if
     setnetpath() was not called previously).  nc_perror() or nc_sperror() can
     be used to print out the reason for failure.  See getnetconfig(3).

     When first called, getnetpath() returns a pointer to the netconfig
     database entry corresponding to the first valid NETPATH component. When
     NETPATH has been exhausted, getnetpath() returns NULL.


SEE ALSO

     getnetconfig(3), netconfig(5), environ(7)

NetBSD 1.5.2                    April 22, 2000                               2