getnetpath

GETNETPATH(3)             BSD Library Functions Manual             GETNETPATH(3)

NAME
     getnetpath, setnetpath, endnetpath — get /etc/netconfig entry corresponding
     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 configuration database
     directly.  The NETPATH variable is a list of colon-separated network
     identifiers.

     The getnetpath() function returns a pointer to the netconfig database entry
     corresponding 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.  The getnetpath() function 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.  The setnetpath()
     function 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().

     The getnetpath() function silently ignores invalid NETPATH components.  A
     NETPATH component 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 netconfig
     database, in the order in which they are listed.

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

     The endnetpath() function returns 0 on success and -1 on failure (for
     example, if setnetpath() was not called previously).  The nc_perror() or
     nc_sperror() function 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)

BSD                              April 22, 2000                              BSD