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nc_perror (3)

>> nc_perror (3) ( FreeBSD man: Библиотечные вызовы )

BSD mandoc

NAME



getnetconfig

 
setnetconfig

 
endnetconfig

 
getnetconfigent

 
freenetconfigent

 
nc_perror

 
nc_sperror

 - get network configuration database entry

LIBRARY

Lb 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 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 Fa 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 Fa 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 structure corresponding to Fa netid . It returns NULL if Fa netid is invalid (that is, does not name an entry in the netconfig database).

The freenetconfigent ();
function frees the netconfig structure pointed to by Fa netconfigp (previously returned by getnetconfigent () .);

The nc_perror ();
function prints a message to the standard error indicating why any of the above routines failed. The message is prepended with the string Fa 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 sending 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 Fa 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.