ZX25RESET (3X) — ACC X.25

NAME

zx25reset - Request a virtual circuit reset

SYNOPSIS

#include <zcom/zcomsys.h>
#include <zcom/zcomx25.h>
 
int zx25reset (zxip, vzap, cause, diag)
 
zx25info_type  *zxip;
zaddr_type     *vzap;
int            cause;
int            diag;

DESCRIPTION

Routine zx25reset requests a virtual circuit reset. It is used to initiate an X.25 RESET Request on the logical channel of the supplied Virtual Circuit ZLU.

The libraries libzx25.a, libzcom_c.a and libpthread.a must be linked into the calling program by giving the "-lzx25 -lzcom_c -lpthread" options to cc(1) or ld(1).

Threads Considerations

This routine may be called from a multi-threaded application using the POSIX (1003.1c) kernel threads API package. It has the following characteristics when called by multi-threaded applications:

cancellation point: Thread cancellation can occur when a thread calls this routine.
async-cancel unsafe: The calling thread's cancelability type must be PTHREAD_CANCEL_DEFERRED if cancellation is enabled.
async-signal unsafe: It cannot be called from a signal handler.
fork unsafe: It cannot be called by a child process after fork(2) but before exec(2).

See the NOTES section that follows for more information on using this routine in a multi-threaded application.

PARAMETERS:

zxip: ZCOM X.25 access data structure (from zx25info call).
vzap: ZCOM address of the Virtual Circuit terminal.
cause: Cause code. The cause code supplied should conform to the CCITT specification for the X.25 protocol. The value must be in the range 0 to 255, but is not validated.
diag: Diagnostic code. The diagnostic code supplied should conform to the CCITT specification for the X.25 protocol. The value must be in the range 0 to 255, but is not validated.

RETURN VALUE

Routine zx25reset returns a 0 when successful. If there was a ZCOM error, it returns a negative value. See /opt/acc/include/zcom/zcomsys.h for the list of ZCOM error codes and their meanings. If zx25reset itself failed, one of the following positive error codes is returned:

ZxeUNKNOWN_L2_ZLU (02): Unable to find the X.25 link ZLU for this SVC ZLU.
ZxeREQ_TIMEOUT (04): The remote ZCOM system did not respond within 30 seconds.
ZxeINVALID_STATE (06): The ZLU specified is not in the correct state to issue a Reset Request.
ZxeLINK_IS_DOWN (11): The X.25 link is down. Unable to issue Reset.
ZxeUNKNOWN_VC_ZLU (13): The ZLU specified is not an X.25 Virtual Circuit ZLU.
ZxeMUST_CALL_ZX25INFO (17): The zx25info() routine has not been called. You must call zx25info before issuing any other zx25...() calls.
ZxeBAD_ZX25INFO_ADDR (18): The pointer to the zx25info_type structure does not contain the same address that was passed to the zx25info() routine.
ZxeX25_NOT_INITIALIZED (98): The ACC X.25 subsystem has not been initialized. You must run zx25d_init before issuing any zx25...() calls.
ZxeX25_TBL_FULL (99): The X.25 routines maintain an internal table for accessing remote ZCOM nodes. This table has room to access up to 20 different ZCOM nodes (including the local node). This request attempted to access the 21st ZCOM remote node and the internal table used had insufficient space to save the routing data.

NOTES

The calling program (or thread) must call zx25info before calling this routine. In a multi-threaded application, each thread must make a separate call to zx25info using a per-thread ZCOM X.25 access data buffer zxip. The per-thread data buffer can then be used to call this routine.

EXAMPLE

#include    <zcom/zcomsys.h>
#include    <zcom/zcomx25.h> 
 
int            ierr;
zx25info_type  zxi;
int            cause;
int            diag;
 
if (ierr = zx25reset (&zxi, &vzaddr, cause, diag)) {
    /* error return code */
}
else {
    /* good return code */
}

FILES

/opt/acc/include/zcom/zcomsys.h: ZCOM system general include file, containing data types, data structures, constants, error codes, masks, etc. Note that this must be the first include file before any other ZCOM include files.
/opt/acc/include/zcom/zcomx25.h: ZCOM X.25 access data structure declarations.