NAME
getnetconfig,
setnetconfig, endnetconfig,
getnetconfigent,
freenetconfigent, nc_perror,
nc_sperror —
get network configuration database
entry
LIBRARY
library “libc”
SYNOPSIS
#include
<netconfig.h>
struct netconfig *
getnetconfig(void
*handlep);
void *
setnetconfig(void);
int
endnetconfig(void
*handlep);
struct netconfig *
getnetconfigent(const
char *netid);
void
freenetconfigent(struct
netconfig *netconfigp);
void
nc_perror(const
char *msg);
char *
nc_sperror(void);
DESCRIPTION
The library routines described on this page provide the application access to the system network configuration database, /etc/netconfig.struct netconfig {
char *nc_netid; /* Network ID */
unsigned long nc_semantics; /* Semantics */
unsigned long nc_flag; /* Flags */
char *nc_protofmly; /* Protocol family */
char *nc_proto; /* Protocol name */
char *nc_device; /* Network device pathname */
unsigned long nc_nlookups; /* Number of directory lookup libs */
char **nc_lookups; /* Names of the libraries */
};
getnetconfig()
returns a pointer to the current entry in the
netconfig database, formatted as a struct netconfig.
Successive calls will return successive netconfig entries in the netconfig
database. getnetconfig() can be used to search the
entire netconfig file. getnetconfig() returns
NULL at the end of the file.
handlep is the handle obtained through
setnetconfig().
A call to
setnetconfig()
has the effect of ``binding'' to or ``rewinding'' the netconfig database.
setnetconfig() must be called before the first call
to getnetconfig() and may be called at any other
time. setnetconfig() need not be called before a
call to getnetconfigent().
setnetconfig() returns a unique handle to be used by
getnetconfig().
endnetconfig()
should be called when processing is complete to release resources for reuse.
handlep is the handle obtained through
setnetconfig(). Programmers should be aware,
however, that the last call to endnetconfig() frees
all memory allocated by getnetconfig() for the
struct netconfig data structure. endnetconfig() may
not be called before setnetconfig().
getnetconfigent()
returns a pointer to the netconfig structure corresponding to
netid. It returns NULL if
netid is invalid (that is, does not name an entry in
the netconfig database).
freenetconfigent()
frees the netconfig structure pointed to by netconfigp
(previously returned by getnetconfigent()).
nc_perror()
prints a message to the standard error indicating why any of the above
routines failed. The message is prepended with the string
msg and a colon. A newline character is appended at
the end of the message.
nc_sperror()
is similar to nc_perror() but instead of sending the
message to the standard error, will return a pointer to a string that
contains the error message.
nc_perror()
and nc_sperror() can also be used with the
NETPATH access routines defined in
getnetpath(3).
RETURN VALUES
setnetconfig() returns a unique handle to
be used by getnetconfig(). In the case of an error,
setnetconfig() returns NULL and
nc_perror() or nc_sperror()
can be used to print the reason for failure.
getnetconfig() returns a pointer to the
current entry in the netconfig database, formatted as a struct netconfig.
getnetconfig() returns NULL at the end of the file,
or upon failure.
endnetconfig() returns 0 on success and -1
on failure (for example, if setnetconfig() was not
called previously).
On success, getnetconfigent() returns a
pointer to the struct netconfig structure
corresponding to netid; otherwise it returns
NULL.
nc_sperror() returns a pointer to a buffer
which contains the error message string. This buffer is overwritten on each
call. In multithreaded applications, this buffer is implemented as
thread-specific data.
FILES
/etc/netconfig