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/*---------------------------------------------------------------------------*/
/*trans.c*/
/*---------------------------------------------------------------------------*/
/*Facilities to keep track of dynamic translators.*/
/*---------------------------------------------------------------------------*/
/*Copyright (C) 2008, 2009 Free Software Foundation, Inc. Written by
Sergiu Ivanov <unlimitedscolobb@gmail.com>.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or * (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
#define _GNU_SOURCE 1
/*---------------------------------------------------------------------------*/
#include <stdlib.h>
#include <hurd/fsys.h>
#include <sys/wait.h>
/*---------------------------------------------------------------------------*/
#include "trans.h"
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/*---------Variables---------------------------------------------------------*/
/*The list of dynamic translators */
trans_el_t * dyntrans = NULL;
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/*---------Functions---------------------------------------------------------*/
/*Adds a translator to the list of translators. One should use only
this function to add a new element to the list. */
error_t
trans_register (fsys_t cntl, pid_t pid, trans_el_t ** new_trans)
{
/*The new entry in the list */
trans_el_t * el;
el = malloc (sizeof (trans_el_t));
if (!el)
return ENOMEM;
el->cntl = cntl;
el->pid = pid;
el->prev = NULL;
el->next = dyntrans;
dyntrans = el;
*new_trans = el;
return 0;
} /*trans_register */
/*---------------------------------------------------------------------------*/
/*Removes a translator from the list. One should use only this
function to remove an element from the list. This function does not
shut down the translator. */
void
trans_unregister (trans_el_t * trans)
{
if (trans->prev)
trans->prev->next = trans->next;
if(trans->next)
trans->next->prev = trans->prev;
free(trans);
} /*trans_unregister */
/*---------------------------------------------------------------------------*/
/*Gracefully shuts down all the translators registered in the list
with `flags`. If wait is nonzero, waits for each translator to
finish. */
error_t
trans_shutdown_all (int flags, int wait)
{
error_t err;
/*The element being dealt with now. */
trans_el_t * el;
/*The exit status of the dynamic translator, in case we are waiting
for it to finish. */
int exit_status;
for (el = dyntrans; el; el = el->next)
{
err = fsys_goaway (el->cntl, flags);
if (err)
{
/*The error cannot happen because the translators are being
shut down in the incorrect order, so something is
wrong. Stop and update dyntrans. */
dyntrans = el;
return err;
}
if (wait)
{
/*Wait for the translator process to stop, if needed. */
waitpid (el->pid, &exit_status, 0);
}
}
dyntrans = NULL;
return 0;
} /*trans_shutdown_all */
/*---------------------------------------------------------------------------*/
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