137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/**
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* @file BThreadSignal.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <misc/debug.h>
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#include <misc/nonblocking.h>
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#include <base/BLog.h>
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#include "BThreadSignal.h"
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#include <generated/blog_channel_BThreadSignal.h>
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static void bfd_handler (void *user, int events)
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{
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BThreadSignal *o = user;
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DebugObject_Access(&o->d_obj);
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char byte;
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ssize_t res = read(o->pipe[0], &byte, sizeof(byte));
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if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
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return;
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}
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if (res < 0) {
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BLog(BLOG_ERROR, "read failed");
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return;
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}
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if (res != sizeof(byte)) {
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BLog(BLOG_ERROR, "bad read");
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return;
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}
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o->handler(o);
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}
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int BThreadSignal_Init (BThreadSignal *o, BReactor *reactor, BThreadSignal_handler handler)
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{
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o->reactor = reactor;
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o->handler = handler;
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if (pipe(o->pipe) < 0) {
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BLog(BLOG_ERROR, "pipe failed");
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goto fail0;
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}
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if (!badvpn_set_nonblocking(o->pipe[0]) || !badvpn_set_nonblocking(o->pipe[1])) {
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BLog(BLOG_ERROR, "badvpn_set_nonblocking failed");
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goto fail1;
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}
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BFileDescriptor_Init(&o->bfd, o->pipe[0], bfd_handler, o);
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if (!BReactor_AddFileDescriptor(o->reactor, &o->bfd)) {
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BLog(BLOG_ERROR, "BReactor_AddFileDescriptor failed");
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goto fail1;
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}
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BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, BREACTOR_READ);
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DebugObject_Init(&o->d_obj);
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return 1;
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fail1:
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if (close(o->pipe[1]) < 0) {
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BLog(BLOG_ERROR, "close failed");
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}
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if (close(o->pipe[0]) < 0) {
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BLog(BLOG_ERROR, "close failed");
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}
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fail0:
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return 0;
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}
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void BThreadSignal_Free (BThreadSignal *o)
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{
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DebugObject_Free(&o->d_obj);
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BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
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if (close(o->pipe[1]) < 0) {
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BLog(BLOG_ERROR, "close failed");
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}
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if (close(o->pipe[0]) < 0) {
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BLog(BLOG_ERROR, "close failed");
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}
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}
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int BThreadSignal_Thread_Signal (BThreadSignal *o)
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{
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DebugObject_Access(&o->d_obj);
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char byte = 0;
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ssize_t res = write(o->pipe[1], &byte, sizeof(byte));
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if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
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return 0;
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}
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if (res < 0) {
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BLog(BLOG_ERROR, "write failed");
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} else if (res != sizeof(byte)) {
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BLog(BLOG_ERROR, "bad write");
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}
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return 1;
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}
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