1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
|
/* wait.c
Copyright (C) 2000 Werner Koch (dd9jn)
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#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_syserror ();
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].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_syserror ();
tag->ctx = ctx;
/* Allocate a structure to hold information about the handler. */
item = calloc (1, sizeof *item);
if (!item)
{
free (tag);
return gpg_error_from_syserror ();
}
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;
}
TRACE3 (DEBUG_CTX, "_gpgme_add_io_cb", ctx,
"fd %d, dir=%d -> tag=%p", fd, dir, tag);
*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;
TRACE2 (DEBUG_CTX, "_gpgme_remove_io_cb", data,
"setting fd 0x%x (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,
gpgme_error_t *op_err)
{
struct wait_item_s *item;
struct io_cb_data iocb_data;
gpgme_error_t err;
item = (struct wait_item_s *) an_fds->opaque;
assert (item);
if (!checked)
{
int nr;
struct io_select_fd_s fds;
TRACE0 (DEBUG_CTX, "_gpgme_run_io_cb", item, "need to check");
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;
}
TRACE2 (DEBUG_CTX, "_gpgme_run_io_cb", item, "handler (%p, %d)",
item->handler_value, an_fds->fd);
iocb_data.handler_value = item->handler_value;
iocb_data.op_err = 0;
err = item->handler (&iocb_data, an_fds->fd);
*op_err = iocb_data.op_err;
return err;
}
|