getnetpath, setnetpath, endnetpath - get /etc/netconfig entry corresponding
to NETPATH component
Standard C Library (libc, -lc)
struct netconfig *
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
getnetpath() 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. 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 component
is invalid if there is no corresponding entry in the netconfig
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.
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.
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.
getnetconfig(3), netconfig(5), environ(7)
BSD April 22, 2000 BSD
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