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-rw-r--r--util/iohandler.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/util/iohandler.c b/util/iohandler.c
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+++ b/util/iohandler.c
@@ -0,0 +1,136 @@
+/*
+ * QEMU System Emulator - managing I/O handler
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu-common.h"
+#include "qemu/queue.h"
+#include "block/aio.h"
+#include "qemu/main-loop.h"
+
+#ifndef _WIN32
+#include <sys/wait.h>
+#endif
+
+/* This context runs on top of main loop. We can't reuse qemu_aio_context
+ * because iohandlers mustn't be polled by aio_poll(qemu_aio_context). */
+static AioContext *iohandler_ctx;
+
+static void iohandler_init(void)
+{
+ if (!iohandler_ctx) {
+ iohandler_ctx = aio_context_new(&error_abort);
+ }
+}
+
+AioContext *iohandler_get_aio_context(void)
+{
+ iohandler_init();
+ return iohandler_ctx;
+}
+
+GSource *iohandler_get_g_source(void)
+{
+ iohandler_init();
+ return aio_get_g_source(iohandler_ctx);
+}
+
+void qemu_set_fd_handler(int fd,
+ IOHandler *fd_read,
+ IOHandler *fd_write,
+ void *opaque)
+{
+ iohandler_init();
+ aio_set_fd_handler(iohandler_ctx, fd, false,
+ fd_read, fd_write, NULL, opaque);
+}
+
+void event_notifier_set_handler(EventNotifier *e,
+ EventNotifierHandler *handler)
+{
+ iohandler_init();
+ aio_set_event_notifier(iohandler_ctx, e, false,
+ handler, NULL);
+}
+
+/* reaping of zombies. right now we're not passing the status to
+ anyone, but it would be possible to add a callback. */
+#ifndef _WIN32
+typedef struct ChildProcessRecord {
+ int pid;
+ QLIST_ENTRY(ChildProcessRecord) next;
+} ChildProcessRecord;
+
+static QLIST_HEAD(, ChildProcessRecord) child_watches =
+ QLIST_HEAD_INITIALIZER(child_watches);
+
+static QEMUBH *sigchld_bh;
+
+static void sigchld_handler(int signal)
+{
+ qemu_bh_schedule(sigchld_bh);
+}
+
+static void sigchld_bh_handler(void *opaque)
+{
+ ChildProcessRecord *rec, *next;
+
+ QLIST_FOREACH_SAFE(rec, &child_watches, next, next) {
+ if (waitpid(rec->pid, NULL, WNOHANG) == rec->pid) {
+ QLIST_REMOVE(rec, next);
+ g_free(rec);
+ }
+ }
+}
+
+static void qemu_init_child_watch(void)
+{
+ struct sigaction act;
+ sigchld_bh = qemu_bh_new(sigchld_bh_handler, NULL);
+
+ memset(&act, 0, sizeof(act));
+ act.sa_handler = sigchld_handler;
+ act.sa_flags = SA_NOCLDSTOP;
+ sigaction(SIGCHLD, &act, NULL);
+}
+
+int qemu_add_child_watch(pid_t pid)
+{
+ ChildProcessRecord *rec;
+
+ if (!sigchld_bh) {
+ qemu_init_child_watch();
+ }
+
+ QLIST_FOREACH(rec, &child_watches, next) {
+ if (rec->pid == pid) {
+ return 1;
+ }
+ }
+ rec = g_malloc0(sizeof(ChildProcessRecord));
+ rec->pid = pid;
+ QLIST_INSERT_HEAD(&child_watches, rec, next);
+ return 0;
+}
+#endif