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f3926945c8
iohandler.c shares the same interface with aio, but with duplicated code. It's better to rebase iohandler, also because that aio is a more friendly interface to multi-threads. Create a global AioContext instance and let its GSource handle the iohandler events. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <1441596538-4412-1-git-send-email-famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*
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* QEMU System Emulator - managing I/O handler
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h"
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#include "qemu-common.h"
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#include "qemu/queue.h"
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#include "block/aio.h"
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#include "qemu/main-loop.h"
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#ifndef _WIN32
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#include <sys/wait.h>
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#endif
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/* This context runs on top of main loop. We can't reuse qemu_aio_context
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* because iohandlers mustn't be polled by aio_poll(qemu_aio_context). */
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static AioContext *iohandler_ctx;
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static void iohandler_init(void)
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{
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if (!iohandler_ctx) {
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iohandler_ctx = aio_context_new(&error_abort);
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}
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}
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GSource *iohandler_get_g_source(void)
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{
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iohandler_init();
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return aio_get_g_source(iohandler_ctx);
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}
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void qemu_set_fd_handler(int fd,
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IOHandler *fd_read,
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IOHandler *fd_write,
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void *opaque)
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{
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iohandler_init();
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aio_set_fd_handler(iohandler_ctx, fd, fd_read, fd_write, opaque);
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}
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/* reaping of zombies. right now we're not passing the status to
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anyone, but it would be possible to add a callback. */
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#ifndef _WIN32
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typedef struct ChildProcessRecord {
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int pid;
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QLIST_ENTRY(ChildProcessRecord) next;
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} ChildProcessRecord;
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static QLIST_HEAD(, ChildProcessRecord) child_watches =
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QLIST_HEAD_INITIALIZER(child_watches);
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static QEMUBH *sigchld_bh;
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static void sigchld_handler(int signal)
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{
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qemu_bh_schedule(sigchld_bh);
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}
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static void sigchld_bh_handler(void *opaque)
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{
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ChildProcessRecord *rec, *next;
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QLIST_FOREACH_SAFE(rec, &child_watches, next, next) {
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if (waitpid(rec->pid, NULL, WNOHANG) == rec->pid) {
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QLIST_REMOVE(rec, next);
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g_free(rec);
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}
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}
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}
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static void qemu_init_child_watch(void)
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{
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struct sigaction act;
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sigchld_bh = qemu_bh_new(sigchld_bh_handler, NULL);
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memset(&act, 0, sizeof(act));
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act.sa_handler = sigchld_handler;
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act.sa_flags = SA_NOCLDSTOP;
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sigaction(SIGCHLD, &act, NULL);
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}
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int qemu_add_child_watch(pid_t pid)
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{
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ChildProcessRecord *rec;
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if (!sigchld_bh) {
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qemu_init_child_watch();
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}
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QLIST_FOREACH(rec, &child_watches, next) {
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if (rec->pid == pid) {
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return 1;
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}
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}
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rec = g_malloc0(sizeof(ChildProcessRecord));
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rec->pid = pid;
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QLIST_INSERT_HEAD(&child_watches, rec, next);
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return 0;
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}
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#endif
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