NAME
getnetpath,
setnetpath, endnetpath
— get /etc/netconfig entry
corresponding to NETPATH component
LIBRARY
library “libc”
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.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 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.
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.