2 Copyright (C) 2000 Werner Koch (dd9jn)
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
5 This file is part of GPGME.
7 GPGME is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of
10 the License, or (at your option) any later version.
12 GPGME is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
29 #include <sys/types.h>
42 _gpgme_fd_table_init (fd_table_t fdt)
49 _gpgme_fd_table_deinit (fd_table_t fdt)
56 /* XXX We should keep a marker and roll over for speed. */
58 fd_table_put (fd_table_t fdt, int fd, int dir, void *opaque, int *idx)
61 struct io_select_fd_s *new_fds;
63 for (i = 0; i < fdt->size; i++)
65 if (fdt->fds[i].fd == -1)
70 #define FDT_ALLOCSIZE 10
71 new_fds = realloc (fdt->fds, (fdt->size + FDT_ALLOCSIZE)
74 return gpg_error_from_errno (errno);
77 fdt->size += FDT_ALLOCSIZE;
78 for (j = 0; j < FDT_ALLOCSIZE; j++)
79 fdt->fds[i + j].fd = -1;
83 fdt->fds[i].for_read = (dir == 1);
84 fdt->fds[i].for_write = (dir == 0);
85 fdt->fds[i].signaled = 0;
86 fdt->fds[i].opaque = opaque;
92 /* Register the file descriptor FD with the handler FNC (which gets
93 FNC_DATA as its first argument) for the direction DIR. DATA should
94 be the context for which the fd is added. R_TAG will hold the tag
95 that can be used to remove the fd. */
97 _gpgme_add_io_cb (void *data, int fd, int dir, gpgme_io_cb_t fnc,
98 void *fnc_data, void **r_tag)
101 gpgme_ctx_t ctx = (gpgme_ctx_t) data;
103 struct wait_item_s *item;
112 tag = malloc (sizeof *tag);
114 return gpg_error_from_errno (errno);
117 /* Allocate a structure to hold information about the handler. */
118 item = calloc (1, sizeof *item);
121 int saved_errno = errno;
123 return gpg_error_from_errno (saved_errno);
128 item->handler_value = fnc_data;
130 err = fd_table_put (fdt, fd, dir, item, &tag->idx);
138 TRACE3 (DEBUG_CTX, "_gpgme_add_io_cb", ctx,
139 "fd %d, dir=%d -> tag=%p", fd, dir, tag);
147 _gpgme_remove_io_cb (void *data)
149 struct tag *tag = data;
161 TRACE2 (DEBUG_CTX, "_gpgme_remove_io_cb", data,
162 "setting fd 0x%x (item=%p) done", fdt->fds[idx].fd,
163 fdt->fds[idx].opaque);
165 free (fdt->fds[idx].opaque);
168 /* Free the table entry. */
169 fdt->fds[idx].fd = -1;
170 fdt->fds[idx].for_read = 0;
171 fdt->fds[idx].for_write = 0;
172 fdt->fds[idx].opaque = NULL;
176 /* This is slightly embarrassing. The problem is that running an I/O
177 callback _may_ influence the status of other file descriptors. Our
178 own event loops could compensate for that, but the external event
179 loops cannot. FIXME: We may still want to optimize this a bit when
180 we are called from our own event loops. So if CHECKED is 1, the
183 _gpgme_run_io_cb (struct io_select_fd_s *an_fds, int checked,
184 gpgme_error_t *op_err)
186 struct wait_item_s *item;
187 struct io_cb_data iocb_data;
190 item = (struct wait_item_s *) an_fds->opaque;
196 struct io_select_fd_s fds;
198 TRACE0 (DEBUG_CTX, "_gpgme_run_io_cb", item, "need to check");
201 /* Just give it a quick poll. */
202 nr = _gpgme_io_select (&fds, 1, 1);
207 /* The status changed in the meantime, there is nothing left
212 TRACE2 (DEBUG_CTX, "_gpgme_run_io_cb", item, "handler (%p, %d)",
213 item->handler_value, an_fds->fd);
215 iocb_data.handler_value = item->handler_value;
216 iocb_data.op_err = 0;
217 err = item->handler (&iocb_data, an_fds->fd);
219 *op_err = iocb_data.op_err;