From f8dbc120c055fb61fa79f901cc2974d049d04f4f Mon Sep 17 00:00:00 2001
From: Nicolas Noble <nnoble@blizzard.com>
Date: Tue, 16 Jul 2013 11:14:34 -0700
Subject: Split the Socket class into Selectable, in order to let it work with
 other non-socket file descriptors.

---
 src/Selectable.cc | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/Selectable.cc

(limited to 'src/Selectable.cc')

diff --git a/src/Selectable.cc b/src/Selectable.cc
new file mode 100644
index 0000000..f716bb1
--- /dev/null
+++ b/src/Selectable.cc
@@ -0,0 +1,137 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include "Selectable.h"
+#include "Threads.h"
+#include "Printer.h"
+#include "Main.h"
+#include "Atomic.h"
+#include "Async.h"
+#include "Task.h"
+#include "TaskMan.h"
+
+#ifndef _WIN32
+namespace {
+
+class SigpipeBlocker : public Balau::AtStart {
+  public:
+      SigpipeBlocker() : AtStart(5) { }
+    virtual void doStart() {
+        struct sigaction new_actn, old_actn;
+        new_actn.sa_handler = SIG_IGN;
+        sigemptyset(&new_actn.sa_mask);
+        new_actn.sa_flags = 0;
+        sigaction(SIGPIPE, &new_actn, &old_actn);
+    }
+};
+
+static SigpipeBlocker sigpipeBlocker;
+
+};
+#endif
+
+void Balau::Selectable::SelectableEvent::gotOwner(Task * task) {
+    Printer::elog(E_SELECT, "Arming SelectableEvent at %p", this);
+    if (!m_task) {
+        Printer::elog(E_SELECT, "...with a new task (%p)", task);
+    } else if (task == m_task) {
+        Printer::elog(E_SELECT, "...with the same task, doing nothing.");
+        return;
+    } else {
+        Printer::elog(E_SELECT, "...with a new task (%p -> %p); stopping first", m_task, task);
+        m_evt.stop();
+    }
+    m_task = task;
+    m_evt.set(task->getLoop());
+    m_evt.start();
+}
+
+void Balau::Selectable::setFD(int fd) throw (GeneralException) {
+    if (m_fd >= 0)
+        throw GeneralException("FD already set.");
+    m_fd = fd;
+
+    m_evtR = new SelectableEvent(m_fd, ev::READ);
+    m_evtW = new SelectableEvent(m_fd, ev::WRITE);
+#ifdef _WIN32
+    u_long iMode = 1;
+    ioctlsocket(m_fd, FIONBIO, &iMode);
+#else
+    fcntl(m_fd, F_SETFL, O_NONBLOCK);
+#endif
+}
+
+Balau::Selectable::~Selectable() {
+    m_fd = -1;
+    delete m_evtR;
+    delete m_evtW;
+    m_evtR = m_evtW = NULL;
+}
+
+bool Balau::Selectable::isClosed() { return m_fd < 0; }
+bool Balau::Selectable::isEOF() { return isClosed(); }
+
+ssize_t Balau::Selectable::read(void * buf, size_t count) throw (GeneralException) {
+    if (count == 0)
+        return 0;
+
+    AAssert(m_fd >= 0, "You can't call read() on a closed selectable");
+
+    int spins = 0;
+
+    do {
+        ssize_t r = recv(m_fd, (char *) buf, count, 0);
+
+        if (r >= 0) {
+            if (r == 0)
+                close();
+            return r;
+        }
+
+        if ((errno == EAGAIN) || (errno == EINTR) || (errno == EWOULDBLOCK)) {
+            Task::operationYield(m_evtR, Task::INTERRUPTIBLE);
+        } else {
+            m_evtR->stop();
+            return r;
+        }
+    } while (spins++ < 2);
+
+    return -1;
+}
+
+ssize_t Balau::Selectable::write(const void * buf, size_t count) throw (GeneralException) {
+    if (count == 0)
+        return 0;
+
+    AAssert(m_fd >= 0, "You can't call write() on a closed selectable");
+
+    int spins = 0;
+
+    do {
+        ssize_t r = send(m_fd, (const char *) buf, count, 0);
+
+        EAssert(r != 0, "send() returned 0 (broken pipe ?)");
+
+        if (r > 0)
+            return r;
+
+#ifndef _WIN32
+        if (errno == EPIPE) {
+            close();
+            return 0;
+        }
+#endif
+
+        if ((errno == EAGAIN) || (errno == EINTR) || (errno == EWOULDBLOCK)) {
+            Task::operationYield(m_evtW, Task::INTERRUPTIBLE);
+        } else {
+            m_evtW->stop();
+            return r;
+        }
+    } while (spins++ < 2);
+
+    return -1;
+}
-- 
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