martin/aqhomecontrol
Public Access
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ipc2: improved flush code in tty object.

Browse Source 
we still occasionally see problems with partially flushed serial port
especially when using /dev/ttyACM0.
This commit is contained in:
Martin Preuss
2026-06-01 15:57:43 +02:00
parent 6117ce5cad
commit b5c9557671
1 changed files with 45 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
aqhome/ipc2/tty_object.c
View File

@@ -38,6 +38,7 @@ static int _cbFlush(AQH_OBJECT *o);
static int _getAttn(int fd);
static int _setAttn(int fd, int val);
static int _fdSetBlocking(int sk, int fl);
static int _fdFlush(int fd);
//static int _msleep(long int msec);
@@ -50,19 +51,13 @@ static int _fdSetBlocking(int sk, int fl);
AQH_OBJECT *AQH_TtyObject_new(AQH_EVENT_LOOP *eventLoop, int fd, int fdMode)
{
AQH_OBJECT *o;
int rv;
o=AQH_FdObject_new(eventLoop, fd, fdMode);
AQH_FdObject_SetStartMsgFn(o, _cbStartMsg);
AQH_FdObject_SetEndMsgFn(o, _cbEndMsg);
AQH_FdObject_SetFlushFn(o, _cbFlush);
rv=tcflush(fd, TCIOFLUSH);
if (rv<0) {
if (errno!=EINTR && errno!=EWOULDBLOCK && errno!=EAGAIN) {
DBG_ERROR(AQH_LOGDOMAIN, "Error on tcflush: %s (%d)", strerror(errno), errno);
}
}
_fdFlush(fd);
return o;
}
@@ -123,23 +118,54 @@ int _cbFlush(AQH_OBJECT *o)
int fd;
fd=AQH_FdObject_GetFd(o);
if (fd>=0) {
int rv;
return (fd>=0)?_fdFlush(fd):0;
}
DBG_ERROR(AQH_LOGDOMAIN, "Flushing");
rv=tcflush(fd, TCIFLUSH);
if (rv<0) {
if (errno!=EINTR && errno!=EWOULDBLOCK && errno!=EAGAIN) {
DBG_ERROR(AQH_LOGDOMAIN, "Error on tcflush: %s (%d)", strerror(errno), errno);
return GWEN_ERROR_IO;
}
int _fdFlush(int fd)
{
#if 0
int rv;
usleep(1000);
rv=ioctl(fd, TCFLSH, 0); // flush receive
if (rv!=0) {
if (errno!=EINTR && errno!=EWOULDBLOCK && errno!=EAGAIN) {
DBG_ERROR(AQH_LOGDOMAIN, "Error on ioctl: %s (%d)", strerror(errno), errno);
return GWEN_ERROR_IO;
}
}
else {
DBG_ERROR(AQH_LOGDOMAIN, "Previous error");
return GWEN_ERROR_IO;
#else
int rv;
usleep(1000);
rv=ioctl(fd, TCFLSH, 0); // flush receive
if (rv!=0) {
if (errno!=EINTR && errno!=EWOULDBLOCK && errno!=EAGAIN) {
DBG_ERROR(AQH_LOGDOMAIN, "Error on ioctl: %s (%d)", strerror(errno), errno);
return GWEN_ERROR_IO;
}
}
for (;;) {
uint8_t buffer[32];
rv=read(fd, buffer, sizeof(buffer));
if (rv==0) {
DBG_ERROR(AQH_LOGDOMAIN, "EOF met");
return GWEN_ERROR_EOF;
}
else if (rv<0) {
if (errno!=EINTR && errno!=EWOULDBLOCK && errno!=EAGAIN) {
DBG_ERROR(AQH_LOGDOMAIN, "Error on read: %s (%d)", strerror(errno), errno);
return GWEN_ERROR_IO;
}
else
break;
}
}
#endif
return 0;
}