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/* wait.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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include "util.h"
#include "context.h"
#include "ops.h"
#include "wait.h"
#include "sema.h"
#include "priv-io.h"
#include "engine.h"
#include "debug.h"
void
_gpgme_fd_table_init (fd_table_t fdt)
{
fdt->fds = NULL;
fdt->size = 0;
}
void
_gpgme_fd_table_deinit (fd_table_t fdt)
{
if (fdt->fds)
free (fdt->fds);
}
/* XXX We should keep a marker and roll over for speed. */
static gpgme_error_t
fd_table_put (fd_table_t fdt, int fd, int dir, void *opaque, int *idx)
{
unsigned int i, j;
struct io_select_fd_s *new_fds;
for (i = 0; i < fdt->size; i++)
{
if (fdt->fds[i].fd == -1)
break;
}
if (i == fdt->size)
{
#define FDT_ALLOCSIZE 10
new_fds = realloc (fdt->fds, (fdt->size + FDT_ALLOCSIZE)
* sizeof (*new_fds));
if (!new_fds)
return gpg_error_from_errno (errno);
fdt->fds = new_fds;
fdt->size += FDT_ALLOCSIZE;
for (j = 0; j < FDT_ALLOCSIZE; j++)
fdt->fds[i + j].fd = -1;
}
fdt->fds[i].fd = fd;
fdt->fds[i].for_read = (dir == 1);
fdt->fds[i].for_write = (dir == 0);
fdt->fds[i].frozen = 0;
fdt->fds[i].signaled = 0;
fdt->fds[i].opaque = opaque;
*idx = i;
return 0;
}
/* Register the file descriptor FD with the handler FNC (which gets
FNC_DATA as its first argument) for the direction DIR. DATA should
be the context for which the fd is added. R_TAG will hold the tag
that can be used to remove the fd. */
gpgme_error_t
_gpgme_add_io_cb (void *data, int fd, int dir, gpgme_io_cb_t fnc,
void *fnc_data, void **r_tag)
{
gpgme_error_t err;
gpgme_ctx_t ctx = (gpgme_ctx_t) data;
fd_table_t fdt;
struct wait_item_s *item;
struct tag *tag;
assert (fnc);
assert (ctx);
fdt = &ctx->fdt;
assert (fdt);
tag = malloc (sizeof *tag);
if (!tag)
return gpg_error_from_errno (errno);
tag->ctx = ctx;
/* Allocate a structure to hold information about the handler. */
item = calloc (1, sizeof *item);
if (!item)
{
int saved_errno = errno;
free (tag);
return gpg_error_from_errno (saved_errno);
}
item->ctx = ctx;
item->dir = dir;
item->handler = fnc;
item->handler_value = fnc_data;
err = fd_table_put (fdt, fd, dir, item, &tag->idx);
if (err)
{
free (tag);
free (item);
return err;
}
*r_tag = tag;
return 0;
}
void
_gpgme_remove_io_cb (void *data)
{
struct tag *tag = data;
gpgme_ctx_t ctx;
fd_table_t fdt;
int idx;
assert (tag);
ctx = tag->ctx;
assert (ctx);
fdt = &ctx->fdt;
assert (fdt);
idx = tag->idx;
DEBUG2 ("setting fd %d (item=%p) done", fdt->fds[idx].fd,
fdt->fds[idx].opaque);
free (fdt->fds[idx].opaque);
free (tag);
/* Free the table entry. */
fdt->fds[idx].fd = -1;
fdt->fds[idx].for_read = 0;
fdt->fds[idx].for_write = 0;
fdt->fds[idx].opaque = NULL;
}
/* This is slightly embarrassing. The problem is that running an I/O
callback _may_ influence the status of other file descriptors. Our
own event loops could compensate for that, but the external event
loops cannot. FIXME: We may still want to optimize this a bit when
we are called from our own event loops. So if CHECKED is 1, the
check is skipped. */
gpgme_error_t
_gpgme_run_io_cb (struct io_select_fd_s *an_fds, int checked)
{
struct wait_item_s *item;
item = (struct wait_item_s *) an_fds->opaque;
assert (item);
if (!checked)
{
int nr;
struct io_select_fd_s fds;
fds = *an_fds;
fds.signaled = 0;
/* Just give it a quick poll. */
nr = _gpgme_io_select (&fds, 1, 1);
assert (nr <= 1);
if (nr < 0)
return errno;
else if (nr == 0)
/* The status changed in the meantime, there is nothing left
to do. */
return 0;
}
return item->handler (item->handler_value, an_fds->fd);
}
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