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/* wait-private.c
Copyright (C) 2000 Werner Koch (dd9jn)
Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
This file is part of GPGME.
GPGME is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
GPGME 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <errno.h>
#include "gpgme.h"
#include "context.h"
#include "wait.h"
#include "ops.h"
#include "priv-io.h"
#include "util.h"
#include "debug.h"
/* The private event loops are used for all blocking operations, and
for the key and trust item listing operations. They are completely
separated from each other. */
/* Internal I/O callback functions. */
/* The add_io_cb and remove_io_cb handlers are shared with the global
event loops. */
void
_gpgme_wait_private_event_cb (void *data, gpgme_event_io_t type,
void *type_data)
{
switch (type)
{
case GPGME_EVENT_START:
/* Nothing to do here, as the wait routine is called after the
initialization is finished. */
break;
case GPGME_EVENT_DONE:
break;
case GPGME_EVENT_NEXT_KEY:
_gpgme_op_keylist_event_cb (data, type, type_data);
break;
case GPGME_EVENT_NEXT_TRUSTITEM:
_gpgme_op_trustlist_event_cb (data, type, type_data);
break;
}
}
/* If COND is a null pointer, wait until the blocking operation in CTX
finished and return its error value. Otherwise, wait until COND is
satisfied or the operation finished. */
gpgme_error_t
_gpgme_wait_on_condition (gpgme_ctx_t ctx, volatile int *cond,
gpgme_error_t *op_err_p)
{
gpgme_error_t err = 0;
int hang = 1;
if (op_err_p)
*op_err_p = 0;
do
{
int nr = _gpgme_io_select (ctx->fdt.fds, ctx->fdt.size, 0);
unsigned int i;
if (nr < 0)
{
/* An error occurred. Close all fds in this context, and
signal it. */
err = gpg_error_from_syserror ();
_gpgme_cancel_with_err (ctx, err, 0);
return err;
}
for (i = 0; i < ctx->fdt.size && nr; i++)
{
if (ctx->fdt.fds[i].fd != -1 && ctx->fdt.fds[i].signaled)
{
gpgme_error_t op_err = 0;
ctx->fdt.fds[i].signaled = 0;
assert (nr);
nr--;
LOCK (ctx->lock);
if (ctx->canceled)
err = gpg_error (GPG_ERR_CANCELED);
UNLOCK (ctx->lock);
if (!err)
err = _gpgme_run_io_cb (&ctx->fdt.fds[i], 0, &op_err);
if (err)
{
/* An error occurred. Close all fds in this context,
and signal it. */
_gpgme_cancel_with_err (ctx, err, 0);
return err;
}
else if (op_err)
{
/* An operational error occurred. Cancel the current
operation but not the session, and signal it. */
_gpgme_cancel_with_err (ctx, 0, op_err);
/* NOTE: This relies on the operational error being
generated after the operation really has
completed, for example after no further status
line output is generated. Otherwise the
following I/O will spill over into the next
operation. */
if (op_err_p)
*op_err_p = op_err;
return 0;
}
}
}
for (i = 0; i < ctx->fdt.size; i++)
if (ctx->fdt.fds[i].fd != -1)
break;
if (i == ctx->fdt.size)
{
struct gpgme_io_event_done_data data;
data.err = 0;
data.op_err = 0;
_gpgme_engine_io_event (ctx->engine, GPGME_EVENT_DONE, &data);
hang = 0;
}
if (cond && *cond)
hang = 0;
}
while (hang);
return 0;
}
/* Wait until the blocking operation in context CTX has finished and
return the error value. This variant can not be used for
session-based protocols. */
gpgme_error_t
_gpgme_wait_one (gpgme_ctx_t ctx)
{
return _gpgme_wait_on_condition (ctx, NULL, NULL);
}
/* Wait until the blocking operation in context CTX has finished and
return the error value. This is the right variant to use for
sesion-based protocols. */
gpgme_error_t
_gpgme_wait_one_ext (gpgme_ctx_t ctx, gpgme_error_t *op_err)
{
return _gpgme_wait_on_condition (ctx, NULL, op_err);
}

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