pppHookLib.c
上传用户:nvosite88
上传日期:2007-01-17
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文件大小:6k
- /* pppHookLib.c - PPP hook library */
- /* Copyright 1995 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01d,14mar99,jdi doc: removed refs to config.h and/or configAll.h (SPR 25663).
- 01c,20aug98,fle doc : removed tab from func headers
- 01b,19dec95,vin doc changes.
- 01a,29nov95,vin written.
- */
- /*
- DESCRIPTION
- This library provides routines to add and delete connect and disconnect
- routines. The connect routine, added on a unit basis, is called before the
- initial phase of link option negotiation. The disconnect routine, added on
- a unit basis is called before the PPP connection is closed. These connect
- and disconnect routines can be used to hook up additional software.
- If either connect or disconnect hook returns ERROR, the connection is
- terminated immediately.
- This library is automatically linked into the VxWorks system image when
- the configuration macro INCLUDE_PPP is defined.
- INCLUDE FILES: pppLib.h
- SEE ALSO: pppLib,
- .pG "Network"
- */
- /* includes */
- #include "vxWorks.h"
- #include "string.h"
- #include "stdlib.h"
- #include "stdio.h"
- #include "errnoLib.h"
- #include "semLib.h"
- #include "pppLib.h"
- /* externs */
- IMPORT PPP_HOOK_RTNS * pppHookRtns []; /* declared in pppLib.c */
- /* locals */
- LOCAL SEM_ID pppHookSemId = NULL; /* protect access to table */
- /*******************************************************************************
- *
- * pppHookLibInit - initialize the PPP hook connect and disconnect facility
- *
- * This routine is initilaizes the connect and disconnect facility
- * It is called from usrNetwork.c when the configuration macro INCLUDE_PPP
- * is defined.
- *
- * RETURNS: N/A
- *
- * NOMANUAL
- */
- STATUS pppHookLibInit (void)
- {
- int ix; /* index variable */
- if (pppHookSemId == NULL) /* already initialized? */
- {
- for (ix = 0; ix < NPPP; ix++)
- pppHookRtns [ix] = NULL;
- if ((pppHookSemId = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE))
- == NULL)
- return (ERROR);
- }
- return (OK);
- }
- /*******************************************************************************
- *
- * pppHookAdd - add a hook routine on a unit basis
- *
- * This routine adds a hook to the Point-to-Point Protocol (PPP) channel.
- * The parameters to this routine specify the unit number (<unit>) of the
- * PPP interface, the hook routine (<hookRtn>), and the type of hook
- * specifying either a connect hook or a disconnect hook (<hookType>).
- * The following hook types can be specified for the <hookType> parameter:
- * .iP PPP_HOOK_CONNECT
- * Specify a connect hook.
- * .iP PPP_HOOK_DISCONNECT
- * Specify a disconnect hook.
- *
- * RETURNS: OK, or ERROR if the hook cannot be added to the unit.
- *
- * SEE ALSO: pppHookDelete()
- */
- STATUS pppHookAdd
- (
- int unit, /* unit number */
- FUNCPTR hookRtn, /* hook routine */
- int hookType /* hook type connect/disconnect */
- )
- {
- PPP_HOOK_RTNS * pPPPHookRtns;
- if (pppHookSemId == NULL)
- {
- errno = S_pppHookLib_NOT_INITIALIZED;
- return (ERROR);
- }
- if (unit < 0 || unit > NPPP)
- {
- errno = S_pppHookLib_INVALID_UNIT;
- return (ERROR);
- }
- if ((hookType != PPP_HOOK_CONNECT) && (hookType != PPP_HOOK_DISCONNECT))
- {
- errno = S_pppHookLib_HOOK_UNKNOWN;
- return (ERROR);
- }
- if ((pPPPHookRtns = pppHookRtns[unit]) == NULL)
- {
- /* allocate it, the first time it is called. */
-
- if ((pPPPHookRtns =
- (PPP_HOOK_RTNS *) calloc (1, sizeof (PPP_HOOK_RTNS))) == NULL)
- return (ERROR);
- }
- else /* check for adding the hook over again */
- {
- if (((hookType == PPP_HOOK_CONNECT) &&
- (pppHookRtns[unit]->connectHook != NULL)) ||
- ((hookType == PPP_HOOK_DISCONNECT) &&
- (pppHookRtns[unit]->disconnectHook != NULL)))
- {
- errno = S_pppHookLib_HOOK_ADDED;
- return (ERROR);
- }
- }
- semTake (pppHookSemId, WAIT_FOREVER); /* exclusive access to list */
-
- pppHookRtns [unit] = pPPPHookRtns;
- if (hookType == PPP_HOOK_CONNECT)
- pPPPHookRtns->connectHook = hookRtn;
- else
- pPPPHookRtns->disconnectHook = hookRtn;
-
- semGive (pppHookSemId); /* give up access */
- return (OK);
- }
- /*******************************************************************************
- *
- * pppHookDelete - delete a hook routine on a unit basis
- *
- * This routine deletes a hook added previously to the
- * Point-to-Point Protocol (PPP) channel. The parameters to this routine
- * specify the unit number (<unit>) of the PPP interface and the type of
- * hook specifying either a connect hook or a disconnect hook (<hookType>).
- * The following hook types can be specified for the <hookType> parameter:
- * .iP PPP_HOOK_CONNECT
- * Specify a connect hook.
- * .iP PPP_HOOK_DISCONNECT
- * Specify a disconnect hook.
- *
- * RETURNS: OK, or ERROR if the hook cannot be deleted for the unit.
- *
- * SEE ALSO: pppHookAdd()
- */
- STATUS pppHookDelete
- (
- int unit, /* unit number */
- int hookType /* hook type connect/disconnect */
- )
- {
- if (pppHookSemId == NULL)
- {
- errno = S_pppHookLib_NOT_INITIALIZED;
- return (ERROR);
- }
- if (unit < 0 || unit > NPPP)
- {
- errno = S_pppHookLib_INVALID_UNIT;
- return (ERROR);
- }
- if ((hookType != PPP_HOOK_CONNECT) && (hookType != PPP_HOOK_DISCONNECT))
- {
- errno = S_pppHookLib_HOOK_UNKNOWN;
- return (ERROR);
- }
- if ((pppHookRtns[unit] == NULL) || (((hookType == PPP_HOOK_CONNECT) &&
- (pppHookRtns[unit]->connectHook
- == NULL)) ||
- ((hookType == PPP_HOOK_DISCONNECT) &&
- (pppHookRtns[unit]->disconnectHook
- == NULL))))
- {
- errno = S_pppHookLib_HOOK_DELETED;
- return (ERROR);
- }
- else
- {
- semTake (pppHookSemId, WAIT_FOREVER); /* exclusive access to list */
-
- if (hookType == PPP_HOOK_CONNECT)
- pppHookRtns[unit]->connectHook = NULL;
- else
- pppHookRtns[unit]->disconnectHook = NULL;
- if ((pppHookRtns[unit]->connectHook == NULL) &&
- (pppHookRtns[unit]->disconnectHook == NULL))
- {
- free (pppHookRtns[unit]); /* free if both hooks are deleted */
- pppHookRtns [unit] = NULL;
- }
- semGive (pppHookSemId); /* give up access */
- }
- return (OK);
- }