nvdimm: implement NVDIMM device abstract
[qemu/ar7.git] / iohandler.c
blobeb680835597532279de2e2d7e1464d699b6fafee
1 /*
2 * QEMU System Emulator - managing I/O handler
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
25 #include "config-host.h"
26 #include "qemu-common.h"
27 #include "qemu/queue.h"
28 #include "block/aio.h"
29 #include "qemu/main-loop.h"
31 #ifndef _WIN32
32 #include <sys/wait.h>
33 #endif
35 /* This context runs on top of main loop. We can't reuse qemu_aio_context
36 * because iohandlers mustn't be polled by aio_poll(qemu_aio_context). */
37 static AioContext *iohandler_ctx;
39 static void iohandler_init(void)
41 if (!iohandler_ctx) {
42 iohandler_ctx = aio_context_new(&error_abort);
46 GSource *iohandler_get_g_source(void)
48 iohandler_init();
49 return aio_get_g_source(iohandler_ctx);
52 void qemu_set_fd_handler(int fd,
53 IOHandler *fd_read,
54 IOHandler *fd_write,
55 void *opaque)
57 iohandler_init();
58 aio_set_fd_handler(iohandler_ctx, fd, false,
59 fd_read, fd_write, opaque);
62 /* reaping of zombies. right now we're not passing the status to
63 anyone, but it would be possible to add a callback. */
64 #ifndef _WIN32
65 typedef struct ChildProcessRecord {
66 int pid;
67 QLIST_ENTRY(ChildProcessRecord) next;
68 } ChildProcessRecord;
70 static QLIST_HEAD(, ChildProcessRecord) child_watches =
71 QLIST_HEAD_INITIALIZER(child_watches);
73 static QEMUBH *sigchld_bh;
75 static void sigchld_handler(int signal)
77 qemu_bh_schedule(sigchld_bh);
80 static void sigchld_bh_handler(void *opaque)
82 ChildProcessRecord *rec, *next;
84 QLIST_FOREACH_SAFE(rec, &child_watches, next, next) {
85 if (waitpid(rec->pid, NULL, WNOHANG) == rec->pid) {
86 QLIST_REMOVE(rec, next);
87 g_free(rec);
92 static void qemu_init_child_watch(void)
94 struct sigaction act;
95 sigchld_bh = qemu_bh_new(sigchld_bh_handler, NULL);
97 memset(&act, 0, sizeof(act));
98 act.sa_handler = sigchld_handler;
99 act.sa_flags = SA_NOCLDSTOP;
100 sigaction(SIGCHLD, &act, NULL);
103 int qemu_add_child_watch(pid_t pid)
105 ChildProcessRecord *rec;
107 if (!sigchld_bh) {
108 qemu_init_child_watch();
111 QLIST_FOREACH(rec, &child_watches, next) {
112 if (rec->pid == pid) {
113 return 1;
116 rec = g_malloc0(sizeof(ChildProcessRecord));
117 rec->pid = pid;
118 QLIST_INSERT_HEAD(&child_watches, rec, next);
119 return 0;
121 #endif