tor-android/external/badvpn_dns/system/BThreadSignal.c

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2015-01-25 11:08:34 +00:00
/**
* @file BThreadSignal.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <unistd.h>
#include <misc/debug.h>
#include <misc/nonblocking.h>
#include <base/BLog.h>
#include "BThreadSignal.h"
#include <generated/blog_channel_BThreadSignal.h>
static void bfd_handler (void *user, int events)
{
BThreadSignal *o = user;
DebugObject_Access(&o->d_obj);
char byte;
ssize_t res = read(o->pipe[0], &byte, sizeof(byte));
if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
return;
}
if (res < 0) {
BLog(BLOG_ERROR, "read failed");
return;
}
if (res != sizeof(byte)) {
BLog(BLOG_ERROR, "bad read");
return;
}
o->handler(o);
}
int BThreadSignal_Init (BThreadSignal *o, BReactor *reactor, BThreadSignal_handler handler)
{
o->reactor = reactor;
o->handler = handler;
if (pipe(o->pipe) < 0) {
BLog(BLOG_ERROR, "pipe failed");
goto fail0;
}
if (!badvpn_set_nonblocking(o->pipe[0]) || !badvpn_set_nonblocking(o->pipe[1])) {
BLog(BLOG_ERROR, "badvpn_set_nonblocking failed");
goto fail1;
}
BFileDescriptor_Init(&o->bfd, o->pipe[0], bfd_handler, o);
if (!BReactor_AddFileDescriptor(o->reactor, &o->bfd)) {
BLog(BLOG_ERROR, "BReactor_AddFileDescriptor failed");
goto fail1;
}
BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, BREACTOR_READ);
DebugObject_Init(&o->d_obj);
return 1;
fail1:
if (close(o->pipe[1]) < 0) {
BLog(BLOG_ERROR, "close failed");
}
if (close(o->pipe[0]) < 0) {
BLog(BLOG_ERROR, "close failed");
}
fail0:
return 0;
}
void BThreadSignal_Free (BThreadSignal *o)
{
DebugObject_Free(&o->d_obj);
BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
if (close(o->pipe[1]) < 0) {
BLog(BLOG_ERROR, "close failed");
}
if (close(o->pipe[0]) < 0) {
BLog(BLOG_ERROR, "close failed");
}
}
int BThreadSignal_Thread_Signal (BThreadSignal *o)
{
DebugObject_Access(&o->d_obj);
char byte = 0;
ssize_t res = write(o->pipe[1], &byte, sizeof(byte));
if (res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
return 0;
}
if (res < 0) {
BLog(BLOG_ERROR, "write failed");
} else if (res != sizeof(byte)) {
BLog(BLOG_ERROR, "bad write");
}
return 1;
}