GETNETCONFIG(3) BSD Library Functions Manual GETNETCONFIG(3)NAME
getnetconfig, setnetconfig, endnetconfig, getnetconfigent,
freenetconfigent, nc_perror, nc_sperror — get network configuration data‐
base entry
LIBRARY
Standard C Library (libc, -lc)
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. The
getnetconfig() function 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. The
getnetconfig() function can be used to search the entire netconfig file.
The getnetconfig() function returns NULL at the end of the file. The
handlep argument is the handle obtained through setnetconfig().
A call to setnetconfig() has the effect of “binding” to or “rewinding”
the netconfig database. The setnetconfig() function must be called
before the first call to getnetconfig() and may be called at any other
time. The setnetconfig() function need not be called before a call to
getnetconfigent(). The setnetconfig() function returns a unique handle
to be used by getnetconfig().
The endnetconfig() function should be called when processing is complete
to release resources for reuse. The handlep argument 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. The
endnetconfig() function may not be called before setnetconfig().
The getnetconfigent() function returns a pointer to the netconfig struc‐
ture corresponding to netid. It returns NULL if netid is invalid (that
is, does not name an entry in the netconfig database).
The freenetconfigent() function frees the netconfig structure pointed to
by netconfigp (previously returned by getnetconfigent()).
The nc_perror() function prints a message to the standard error indicat‐
ing 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.
The nc_sperror() function is similar to nc_perror() but instead of send‐
ing the message to the standard error, will return a pointer to a string
that contains the error message.
The nc_perror() and nc_sperror() functions can also be used with the
NETPATH access routines defined in getnetpath(3).
RETURN VALUES
The setnetconfig() function 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.
The getnetconfig() function returns a pointer to the current entry in the
netconfig database, formatted as a struct netconfig. The getnetconfig()
function returns NULL at the end of the file, or upon failure.
The endnetconfig() function 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.
The nc_sperror() function 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
SEE ALSOgetnetpath(3), netconfig(5)BSD April 22, 2000 BSD
