diff options
Diffstat (limited to 'src/wait.c')
| -rw-r--r-- | src/wait.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/wait.c b/src/wait.c new file mode 100644 index 0000000..a552b54 --- /dev/null +++ b/src/wait.c @@ -0,0 +1,223 @@ +/* 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_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].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; + } + + 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; +} |