hw/arm/virt: pass VirtMachineState instead of VirtGuestInfo
[qemu.git] / iohandler.c
1 /*
2 * QEMU System Emulator - managing I/O handler
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
27 #include "qemu-common.h"
28 #include "qemu/queue.h"
29 #include "block/aio.h"
30 #include "qemu/main-loop.h"
31
32 #ifndef _WIN32
33 #include <sys/wait.h>
34 #endif
35
36 /* This context runs on top of main loop. We can't reuse qemu_aio_context
37 * because iohandlers mustn't be polled by aio_poll(qemu_aio_context). */
38 static AioContext *iohandler_ctx;
39
40 static void iohandler_init(void)
41 {
42 if (!iohandler_ctx) {
43 iohandler_ctx = aio_context_new(&error_abort);
44 }
45 }
46
47 AioContext *iohandler_get_aio_context(void)
48 {
49 iohandler_init();
50 return iohandler_ctx;
51 }
52
53 GSource *iohandler_get_g_source(void)
54 {
55 iohandler_init();
56 return aio_get_g_source(iohandler_ctx);
57 }
58
59 void qemu_set_fd_handler(int fd,
60 IOHandler *fd_read,
61 IOHandler *fd_write,
62 void *opaque)
63 {
64 iohandler_init();
65 aio_set_fd_handler(iohandler_ctx, fd, false,
66 fd_read, fd_write, NULL, opaque);
67 }
68
69 /* reaping of zombies. right now we're not passing the status to
70 anyone, but it would be possible to add a callback. */
71 #ifndef _WIN32
72 typedef struct ChildProcessRecord {
73 int pid;
74 QLIST_ENTRY(ChildProcessRecord) next;
75 } ChildProcessRecord;
76
77 static QLIST_HEAD(, ChildProcessRecord) child_watches =
78 QLIST_HEAD_INITIALIZER(child_watches);
79
80 static QEMUBH *sigchld_bh;
81
82 static void sigchld_handler(int signal)
83 {
84 qemu_bh_schedule(sigchld_bh);
85 }
86
87 static void sigchld_bh_handler(void *opaque)
88 {
89 ChildProcessRecord *rec, *next;
90
91 QLIST_FOREACH_SAFE(rec, &child_watches, next, next) {
92 if (waitpid(rec->pid, NULL, WNOHANG) == rec->pid) {
93 QLIST_REMOVE(rec, next);
94 g_free(rec);
95 }
96 }
97 }
98
99 static void qemu_init_child_watch(void)
100 {
101 struct sigaction act;
102 sigchld_bh = qemu_bh_new(sigchld_bh_handler, NULL);
103
104 memset(&act, 0, sizeof(act));
105 act.sa_handler = sigchld_handler;
106 act.sa_flags = SA_NOCLDSTOP;
107 sigaction(SIGCHLD, &act, NULL);
108 }
109
110 int qemu_add_child_watch(pid_t pid)
111 {
112 ChildProcessRecord *rec;
113
114 if (!sigchld_bh) {
115 qemu_init_child_watch();
116 }
117
118 QLIST_FOREACH(rec, &child_watches, next) {
119 if (rec->pid == pid) {
120 return 1;
121 }
122 }
123 rec = g_malloc0(sizeof(ChildProcessRecord));
124 rec->pid = pid;
125 QLIST_INSERT_HEAD(&child_watches, rec, next);
126 return 0;
127 }
128 #endif