commit 8a2d9073e959356808ce1685822b839d880e6498
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Sep 14 17:27:35 2012 +0200
Replace most calls to select(2) with poll(2)
select(2) limits the number of file descriptor in a process to
FD_SETSIZE (typically 1023). Process creation and certain socket
operations fail because they call select(2) on a file descriptor outside
the FD_SETSIZE range.
The remaining select(2) calls are used for timeouts only, or are in the
traditional event loop. The glib-based event loop does not use
select(2), so this should be sufficient.
This change adds a poll emulation for VxWorks, which only offers
select(2).
Change-Id: I9b0cf5bec81da70b29c501c62d14fb57df87fa61
diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index e159bf8..bb8a3ae 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -134,13 +134,6 @@ static void qt_sa_sigchld_handler(int signum)
oldAction(signum);
}
-static inline void add_fd(int &nfds, int fd, fd_set *fdset)
-{
- FD_SET(fd, fdset);
- if ((fd) > nfds)
- nfds = fd;
-}
-
struct QProcessInfo {
QProcess *process;
int deathPipe;
@@ -235,9 +228,9 @@ QProcessManager::~QProcessManager()
void QProcessManager::run()
{
forever {
- fd_set readset;
- FD_ZERO(&readset);
- FD_SET(qt_qprocess_deadChild_pipe[0], &readset);
+ pollfd fd;
+ fd.fd = qt_qprocess_deadChild_pipe[0];
+ fd.events = POLLIN;
#if defined (QPROCESS_DEBUG)
qDebug() << "QProcessManager::run() waiting for children to die";
@@ -246,8 +239,8 @@ void QProcessManager::run()
// block forever, or until activity is detected on the dead child
// pipe. the only other peers are the SIGCHLD signal handler, and the
// QProcessManager destructor.
- int nselect = select(qt_qprocess_deadChild_pipe[0] + 1, &readset, 0, 0, 0);
- if (nselect < 0) {
+ int ret = qt_safe_poll(&fd, 1, -1, /* retry_eintr */ false);
+ if (ret < 0) {
if (errno == EINTR)
continue;
break;
@@ -996,17 +989,6 @@ void QProcessPrivate::killProcess()
::kill(pid_t(pid), SIGKILL);
}
-static int select_msecs(int nfds, fd_set *fdread, fd_set *fdwrite, int timeout)
-{
- if (timeout < 0)
- return qt_safe_select(nfds, fdread, fdwrite, 0, 0);
-
- struct timeval tv;
- tv.tv_sec = timeout / 1000;
- tv.tv_usec = (timeout % 1000) * 1000;
- return qt_safe_select(nfds, fdread, fdwrite, 0, &tv);
-}
-
/*
Returns the difference between msecs and elapsed. If msecs is -1,
however, -1 is returned.
@@ -1029,10 +1011,10 @@ bool QProcessPrivate::waitForStarted(int msecs)
childStartedPipe[0]);
#endif
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(childStartedPipe[0], &fds);
- if (select_msecs(childStartedPipe[0] + 1, &fds, 0, msecs) == 0) {
+ pollfd fd;
+ fd.fd = childStartedPipe[0];
+ fd.events = POLLIN;
+ if (qt_safe_poll(&fd, 1, msecs) == 0) {
processError = QProcess::Timedout;
q->setErrorString(QProcess::tr("Process operation timed out"));
#if defined (QPROCESS_DEBUG)
@@ -1048,6 +1030,47 @@ bool QProcessPrivate::waitForStarted(int msecs)
return startedEmitted;
}
+class QProcessFDSet {
+ pollfd fds[5];
+
+ static size_t size()
+ {
+ return sizeof(fds)/sizeof(fds[0]);
+ }
+
+public:
+ QProcessFDSet(QProcessPrivate &proc)
+ {
+ for (size_t i = 0; i < size(); ++i) {
+ fds[i].fd = -1;
+ fds[i].events = POLLIN;
+ }
+ death().fd = proc.deathPipe[0];
+
+ if (proc.processState == QProcess::Starting)
+ started().fd = proc.childStartedPipe[0];
+
+ stdout().fd = proc.stdoutChannel.pipe[0];
+ stderr().fd = proc.stderrChannel.pipe[0];
+
+ if (!proc.writeBuffer.isEmpty()) {
+ stdin().fd = proc.stdinChannel.pipe[1];
+ stdin().events = POLLOUT;
+ }
+ }
+
+ int poll(int timeout)
+ {
+ return qt_safe_poll(fds, size(), timeout);
+ }
+
+ pollfd &death() { return fds[0]; }
+ pollfd &started() { return fds[1]; }
+ pollfd &stdout() { return fds[2]; }
+ pollfd &stderr() { return fds[3]; }
+ pollfd &stdin() { return fds[4]; }
+};
+
bool QProcessPrivate::waitForReadyRead(int msecs)
{
Q_Q(QProcess);
@@ -1059,28 +1082,9 @@ bool QProcessPrivate::waitForReadyRead(int msecs)
stopWatch.start();
forever {
- fd_set fdread;
- fd_set fdwrite;
-
- FD_ZERO(&fdread);
- FD_ZERO(&fdwrite);
-
- int nfds = deathPipe[0];
- FD_SET(deathPipe[0], &fdread);
-
- if (processState == QProcess::Starting)
- add_fd(nfds, childStartedPipe[0], &fdread);
-
- if (stdoutChannel.pipe[0] != -1)
- add_fd(nfds, stdoutChannel.pipe[0], &fdread);
- if (stderrChannel.pipe[0] != -1)
- add_fd(nfds, stderrChannel.pipe[0], &fdread);
-
- if (!writeBuffer.isEmpty() && stdinChannel.pipe[1] != -1)
- add_fd(nfds, stdinChannel.pipe[1], &fdwrite);
-
+ QProcessFDSet fdset(*this);
int timeout = qt_timeout_value(msecs, stopWatch.elapsed());
- int ret = select_msecs(nfds + 1, &fdread, &fdwrite, timeout);
+ int ret = fdset.poll(timeout);
if (ret < 0) {
break;
}
@@ -1090,18 +1094,18 @@ bool QProcessPrivate::waitForReadyRead(int msecs)
return false;
}
- if (childStartedPipe[0] != -1 && FD_ISSET(childStartedPipe[0], &fdread)) {
+ if (qt_readable(fdset.started())) {
if (!_q_startupNotification())
return false;
}
bool readyReadEmitted = false;
- if (stdoutChannel.pipe[0] != -1 && FD_ISSET(stdoutChannel.pipe[0], &fdread)) {
+ if (qt_readable(fdset.stdout())) {
bool canRead = _q_canReadStandardOutput();
if (processChannel == QProcess::StandardOutput && canRead)
readyReadEmitted = true;
}
- if (stderrChannel.pipe[0] != -1 && FD_ISSET(stderrChannel.pipe[0], &fdread)) {
+ if (qt_readable(fdset.stderr())) {
bool canRead = _q_canReadStandardError();
if (processChannel == QProcess::StandardError && canRead)
readyReadEmitted = true;
@@ -1109,13 +1113,13 @@ bool QProcessPrivate::waitForReadyRead(int msecs)
if (readyReadEmitted)
return true;
- if (stdinChannel.pipe[1] != -1 && FD_ISSET(stdinChannel.pipe[1], &fdwrite))
+ if (qt_writable(fdset.stdin()))
_q_canWrite();
- if (deathPipe[0] == -1 || FD_ISSET(deathPipe[0], &fdread)) {
+ if (qt_readable(fdset.death())) {
if (_q_processDied())
return false;
- }
+ }
}
return false;
}
@@ -1131,29 +1135,9 @@ bool QProcessPrivate::waitForBytesWritten(int msecs)
stopWatch.start();
while (!writeBuffer.isEmpty()) {
- fd_set fdread;
- fd_set fdwrite;
-
- FD_ZERO(&fdread);
- FD_ZERO(&fdwrite);
-
- int nfds = deathPipe[0];
- FD_SET(deathPipe[0], &fdread);
-
- if (processState == QProcess::Starting)
- add_fd(nfds, childStartedPipe[0], &fdread);
-
- if (stdoutChannel.pipe[0] != -1)
- add_fd(nfds, stdoutChannel.pipe[0], &fdread);
- if (stderrChannel.pipe[0] != -1)
- add_fd(nfds, stderrChannel.pipe[0], &fdread);
-
-
- if (!writeBuffer.isEmpty() && stdinChannel.pipe[1] != -1)
- add_fd(nfds, stdinChannel.pipe[1], &fdwrite);
-
+ QProcessFDSet fdset(*this);
int timeout = qt_timeout_value(msecs, stopWatch.elapsed());
- int ret = select_msecs(nfds + 1, &fdread, &fdwrite, timeout);
+ int ret = fdset.poll(timeout);
if (ret < 0) {
break;
}
@@ -1164,24 +1148,24 @@ bool QProcessPrivate::waitForBytesWritten(int msecs)
return false;
}
- if (childStartedPipe[0] != -1 && FD_ISSET(childStartedPipe[0], &fdread)) {
+ if (qt_readable(fdset.started())) {
if (!_q_startupNotification())
return false;
}
- if (stdinChannel.pipe[1] != -1 && FD_ISSET(stdinChannel.pipe[1], &fdwrite))
+ if (qt_writable(fdset.stdin()))
return _q_canWrite();
- if (stdoutChannel.pipe[0] != -1 && FD_ISSET(stdoutChannel.pipe[0], &fdread))
+ if (qt_readable(fdset.stdout()))
_q_canReadStandardOutput();
- if (stderrChannel.pipe[0] != -1 && FD_ISSET(stderrChannel.pipe[0], &fdread))
+ if (qt_readable(fdset.stderr()))
_q_canReadStandardError();
- if (deathPipe[0] == -1 || FD_ISSET(deathPipe[0], &fdread)) {
- if (_q_processDied())
- return false;
- }
+ if (qt_readable(fdset.death())) {
+ if (_q_processDied())
+ return false;
+ }
}
return false;
@@ -1198,29 +1182,9 @@ bool QProcessPrivate::waitForFinished(int msecs)
stopWatch.start();
forever {
- fd_set fdread;
- fd_set fdwrite;
- int nfds = -1;
-
- FD_ZERO(&fdread);
- FD_ZERO(&fdwrite);
-
- if (processState == QProcess::Starting)
- add_fd(nfds, childStartedPipe[0], &fdread);
-
- if (stdoutChannel.pipe[0] != -1)
- add_fd(nfds, stdoutChannel.pipe[0], &fdread);
- if (stderrChannel.pipe[0] != -1)
- add_fd(nfds, stderrChannel.pipe[0], &fdread);
-
- if (processState == QProcess::Running)
- add_fd(nfds, deathPipe[0], &fdread);
-
- if (!writeBuffer.isEmpty() && stdinChannel.pipe[1] != -1)
- add_fd(nfds, stdinChannel.pipe[1], &fdwrite);
-
+ QProcessFDSet fdset(*this);
int timeout = qt_timeout_value(msecs, stopWatch.elapsed());
- int ret = select_msecs(nfds + 1, &fdread, &fdwrite, timeout);
+ int ret = fdset.poll(timeout);
if (ret < 0) {
break;
}
@@ -1230,20 +1194,20 @@ bool QProcessPrivate::waitForFinished(int msecs)
return false;
}
- if (childStartedPipe[0] != -1 && FD_ISSET(childStartedPipe[0], &fdread)) {
+ if (qt_readable(fdset.started())) {
if (!_q_startupNotification())
return false;
}
- if (stdinChannel.pipe[1] != -1 && FD_ISSET(stdinChannel.pipe[1], &fdwrite))
+ if (qt_writable(fdset.stdin()))
_q_canWrite();
- if (stdoutChannel.pipe[0] != -1 && FD_ISSET(stdoutChannel.pipe[0], &fdread))
+ if (qt_readable(fdset.stdout()))
_q_canReadStandardOutput();
- if (stderrChannel.pipe[0] != -1 && FD_ISSET(stderrChannel.pipe[0], &fdread))
+ if (qt_readable(fdset.stderr()))
_q_canReadStandardError();
- if (deathPipe[0] == -1 || FD_ISSET(deathPipe[0], &fdread)) {
+ if (qt_readable(fdset.death())) {
if (_q_processDied())
return true;
}
@@ -1253,10 +1217,10 @@ bool QProcessPrivate::waitForFinished(int msecs)
bool QProcessPrivate::waitForWrite(int msecs)
{
- fd_set fdwrite;
- FD_ZERO(&fdwrite);
- FD_SET(stdinChannel.pipe[1], &fdwrite);
- return select_msecs(stdinChannel.pipe[1] + 1, 0, &fdwrite, msecs < 0 ? 0 : msecs) == 1;
+ pollfd fd;
+ fd.fd = stdinChannel.pipe[1];
+ fd.events = POLLIN;
+ return qt_safe_poll(&fd, 1, msecs);
}
void QProcessPrivate::findExitCode()
diff --git a/src/corelib/kernel/qcore_unix.cpp b/src/corelib/kernel/qcore_unix.cpp
index cc54798..ca178bb 100644
--- a/src/corelib/kernel/qcore_unix.cpp
+++ b/src/corelib/kernel/qcore_unix.cpp
@@ -103,4 +103,165 @@ int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
}
}
+#ifndef Q_OS_VXWORKS
+
+int qt_safe_poll(struct pollfd *fds, int nfds, int timeout_ms, bool retry_eintr)
+{
+ if (nfds == 0)
+ return 0;
+ if (nfds < 0) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ // Retry on ret == 0 if the deadline has not yet passed because
+ // Linux can return early from the syscall, without setting EINTR.
+ if (timeout_ms < 0) {
+ forever {
+ int ret = ::poll(fds, nfds, -1);
+ if (ret > 0)
+ return ret;
+ if (retry_eintr) {
+ if (ret == 0 || ret == -1 && errno == EINTR) {
+ continue;
+ } else {
+ return -1;
+ }
+ }
+ if (ret == 0) {
+ errno = EINTR;
+ return -1;
+ }
+ return ret;
+ }
+ }
+
+ timeval previous = qt_gettime();
+ timeval deadline = previous;
+ deadline.tv_sec += timeout_ms / 1000;
+ deadline.tv_usec += (timeout_ms % 1000) * 1000;
+ if (deadline.tv_usec >= 1000000) {
+ ++deadline.tv_sec;
+ deadline.tv_usec -= 1000000;
+ }
+ int remaining = timeout_ms;
+
+ forever {
+ int ret = ::poll(fds, nfds, remaining);
+ if (ret > 0)
+ return ret;
+ timeval now = qt_gettime();
+ if ((now.tv_sec > deadline.tv_sec // past deadline
+ || (now.tv_sec == deadline.tv_sec
+ && now.tv_usec >= deadline.tv_usec))
+ || (now.tv_sec < previous.tv_sec // time warp
+ || (now.tv_sec == previous.tv_sec
+ && now.tv_usec < previous.tv_usec))
+ || (ret < 0 && (errno != EINTR || !retry_eintr))) // other error
+ return ret;
+ if (ret == 0 && !retry_eintr) {
+ errno = EINTR;
+ return -1;
+ }
+ remaining = (deadline.tv_sec - now.tv_sec) * 1000
+ + (deadline.tv_usec - now.tv_usec) / 1000;
+ previous = now;
+ }
+}
+
+#else
+
+// Poll emulation for VxWorks.
+
+static int mark_bad_descriptors(pollfd *fds, int nfds)
+{
+ fd_set r;
+ FD_ZERO(&r);
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ int ret = 0;
+
+ // Check each descriptor invidually for badness.
+ for (int i = 0; i < nfds; ++i) {
+ pollfd &fd(fds[i]);
+ if (fd.fd >= 0) {
+ FD_SET(fd.fd, &r);
+ int ret = qt_safe_select(fd.fd + 1, &r, NULL, NULL, &tv);
+ FD_CLR(fd.fd, &r);
+ if (ret < 0 && errno == EBADF) {
+ fd.revents = POLLNVAL;
+ ++ret;
+ }
+ }
+ }
+ Q_ASSERT(ret > 0);
+ return ret;
+}
+
+int qt_safe_poll(pollfd *fds, int nfds, int timeout, bool retry_eintr)
+{
+ fd_set r, w;
+ FD_ZERO(&r);
+ FD_ZERO(&w);
+ int maxfd = -1;
+
+ // Extract the watched descriptors.
+ for (int i = 0; i < nfds; ++i) {
+ pollfd &fd(fds[i]);
+ if (fd.fd >= 0 && fd.fd < FD_SETSIZE) {
+ if (fd.events & POLLIN) {
+ FD_SET(fd.fd, &r);
+ if (fd.fd > maxfd)
+ maxfd = fd.fd;
+ }
+ if (fd.events & POLLOUT) {
+ FD_SET(fd.fd, &w);
+ if (fd.fd > maxfd)
+ maxfd = fd.fd;
+ }
+ }
+ }
+
+ // If timeout is negative, wait indefinitely for activity.
+ timeval tv;
+ timeval *ptv;
+ if (timeout >= 0) {
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000) * 1000;
+ ptv = &tv;
+ } else
+ ptv = NULL;
+
+ int ret;
+ if (retry_eintr)
+ ret = qt_safe_select(maxfd + 1, &r, &w, NULL, ptv);
+ else
+ ret = ::select(maxfd + 1, &r, &w, NULL, ptv);
+ if (ret < 0 && errno == EBADF) {
+ return mark_bad_descriptors(fds, nfds);
+ }
+ if (ret <= 0)
+ return ret;
+
+ // Set the revents flags.
+ ret = 0;
+ for (int i = 0; i < nfds; ++i) {
+ pollfd &fd(fds[i]);
+ fd.revents = 0;
+ if (fd.fd >= 0 && fd.fd < FD_SETSIZE) {
+ if ((fd.events & POLLIN) && FD_ISSET(fd.fd, &r))
+ fd.revents |= POLLIN;
+ if ((fd.events & POLLOUT) && FD_ISSET(fd.fd, &w))
+ fd.revents |= POLLOUT;
+ if (fd.revents)
+ ++ret;
+ }
+ }
+ Q_ASSERT(ret > 0);
+ return ret;
+}
+
+#endif // Q_OS_VXWORKS
+
QT_END_NAMESPACE
diff --git a/src/corelib/kernel/qcore_unix_p.h b/src/corelib/kernel/qcore_unix_p.h
index 6342b03..f7f4767 100644
--- a/src/corelib/kernel/qcore_unix_p.h
+++ b/src/corelib/kernel/qcore_unix_p.h
@@ -71,6 +71,8 @@
#if defined(Q_OS_VXWORKS)
# include <ioLib.h>
+#else
+# include <poll.h>
#endif
struct sockaddr;
@@ -341,6 +343,36 @@ void qt_nanosleep(timespec amount);
Q_CORE_EXPORT int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
const struct timeval *tv);
+#ifdef Q_OS_VXWORKS
+// Poll emulation for VxWorks. Provided by <poll.h> on other systems.
+
+struct pollfd {
+ int fd;
+ short events;
+ short revents;
+};
+
+#define POLLIN 1
+#define POLLOUT 2
+#define POLLERR 4
+#define POLLHUP 8
+#define POLLNVAL 16
+#endif
+
+inline bool qt_readable(const pollfd &fd)
+{
+ return fd.fd >= 0 && (fd.revents & (POLLIN | POLLHUP | POLLERR | POLLNVAL)) != 0;
+}
+
+inline bool qt_writable(const pollfd &fd)
+{
+ return fd.fd >= 0 && (fd.revents & (POLLOUT | POLLHUP | POLLERR | POLLNVAL)) != 0;
+}
+
+// Deprecated due to FD_SETSIZE limitation, use qt_safe_poll instead.
+Q_CORE_EXPORT int qt_safe_poll(pollfd *fds, int nfds, int timeout,
+ bool retry_eintr = true);
+
// according to X/OPEN we have to define semun ourselves
// we use prefix as on some systems sem.h will have it
struct semid_ds;
diff --git a/src/network/socket/qlocalserver_unix.cpp b/src/network/socket/qlocalserver_unix.cpp
index 2bcf1ac..efb8128 100644
--- a/src/network/socket/qlocalserver_unix.cpp
+++ b/src/network/socket/qlocalserver_unix.cpp
@@ -293,16 +293,11 @@ void QLocalServerPrivate::_q_onNewConnection()
void QLocalServerPrivate::waitForNewConnection(int msec, bool *timedOut)
{
- fd_set readfds;
- FD_ZERO(&readfds);
- FD_SET(listenSocket, &readfds);
+ struct pollfd fd;
+ fd.fd = listenSocket;
+ fd.events = POLLIN;
- timeval timeout;
- timeout.tv_sec = msec / 1000;
- timeout.tv_usec = (msec % 1000) * 1000;
-
- int result = -1;
- result = qt_safe_select(listenSocket + 1, &readfds, 0, 0, (msec == -1) ? 0 : &timeout);
+ int result = qt_safe_poll(&fd, 1, msec);
if (-1 == result) {
setError(QLatin1String("QLocalServer::waitForNewConnection"));
closeServer();
diff --git a/src/network/socket/qlocalsocket_unix.cpp b/src/network/socket/qlocalsocket_unix.cpp
index 49eb71a..c598c2b 100644
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@@ -56,10 +56,6 @@
#include <qdebug.h>
#include <qelapsedtimer.h>
-#ifdef Q_OS_VXWORKS
-# include <selectLib.h>
-#endif
-
#define QT_CONNECT_TIMEOUT 30000
QT_BEGIN_NAMESPACE
@@ -524,25 +520,16 @@ bool QLocalSocket::waitForConnected(int msec)
if (state() != ConnectingState)
return (state() == ConnectedState);
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(d->connectingSocket, &fds);
-
- timeval timeout;
- timeout.tv_sec = msec / 1000;
- timeout.tv_usec = (msec % 1000) * 1000;
+ pollfd fd;
+ fd.fd = d->connectingSocket;
+ fd.events = POLLIN | POLLOUT;
- // timeout can not be 0 or else select will return an error.
- if (0 == msec)
- timeout.tv_usec = 1000;
-
- int result = -1;
- // on Linux timeout will be updated by select, but _not_ on other systems.
+ int result;
QElapsedTimer timer;
+ int remaining = msec > 0 ? msec : 1000;
timer.start();
- while (state() == ConnectingState
- && (-1 == msec || timer.elapsed() < msec)) {
- result = ::select(d->connectingSocket + 1, &fds, 0, 0, &timeout);
+ while (state() == ConnectingState) {
+ result = qt_safe_poll(&fd, 1, remaining, /* retry_eintr */ false);
if (-1 == result && errno != EINTR) {
d->errorOccurred( QLocalSocket::UnknownSocketError,
QLatin1String("QLocalSocket::waitForConnected"));
@@ -550,6 +537,11 @@ bool QLocalSocket::waitForConnected(int msec)
}
if (result > 0)
d->_q_connectToSocket();
+ if (msec >= 0) {
+ remaining = timer.elapsed() - msec;
+ if (remaining < 0)
+ break;
+ }
}
return (state() == ConnectedState);
diff --git a/src/network/socket/qnativesocketengine_unix.cpp b/src/network/socket/qnativesocketengine_unix.cpp
index 4f3408b..a1bb298 100644
--- a/src/network/socket/qnativesocketengine_unix.cpp
+++ b/src/network/socket/qnativesocketengine_unix.cpp
@@ -1122,48 +1122,40 @@ qint64 QNativeSocketEnginePrivate::nativeRead(char *data, qint64 maxSize)
int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) const
{
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(socketDescriptor, &fds);
-
- struct timeval tv;
- tv.tv_sec = timeout / 1000;
- tv.tv_usec = (timeout % 1000) * 1000;
-
- int retval;
- if (selectForRead)
- retval = qt_safe_select(socketDescriptor + 1, &fds, 0, 0, timeout < 0 ? 0 : &tv);
- else
- retval = qt_safe_select(socketDescriptor + 1, 0, &fds, 0, timeout < 0 ? 0 : &tv);
-
- return retval;
+ struct pollfd fd;
+ fd.fd = socketDescriptor;
+ if (selectForRead) {
+ fd.events = POLLIN;
+ } else {
+ fd.events = POLLOUT;
+ }
+ return qt_safe_poll(&fd, 1, timeout);
}
int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool checkWrite,
bool *selectForRead, bool *selectForWrite) const
{
- fd_set fdread;
- FD_ZERO(&fdread);
+ struct pollfd fd;
+ fd.fd = socketDescriptor;
if (checkRead)
- FD_SET(socketDescriptor, &fdread);
-
- fd_set fdwrite;
- FD_ZERO(&fdwrite);
+ fd.events = POLLIN;
+ else
+ fd.events = 0;
if (checkWrite)
- FD_SET(socketDescriptor, &fdwrite);
-
- struct timeval tv;
- tv.tv_sec = timeout / 1000;
- tv.tv_usec = (timeout % 1000) * 1000;
-
- int ret;
- ret = qt_safe_select(socketDescriptor + 1, &fdread, &fdwrite, 0, timeout < 0 ? 0 : &tv);
-
+ fd.events |= POLLOUT;
+ int ret = qt_safe_poll(&fd, 1, timeout);
if (ret <= 0)
- return ret;
- *selectForRead = FD_ISSET(socketDescriptor, &fdread);
- *selectForWrite = FD_ISSET(socketDescriptor, &fdwrite);
-
+ return ret;
+ bool r = (fd.revents & (POLLIN | POLLHUP | POLLERR)) != 0;
+ bool w = (fd.revents & (POLLOUT | POLLHUP | POLLERR)) != 0;
+ // Emulate the return value from select(2).
+ ret = 0;
+ if (r)
+ ++ret;
+ if (w)
+ ++ret;
+ *selectForRead = r;
+ *selectForWrite = w;
return ret;
}