1 /* 2 * QEMU System Emulator 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 "qemu-common.h" 27 #include "qemu/module.h" 28 #include "qemu/sockets.h" 29 #include "qapi/error.h" 30 #include "chardev/char.h" 31 #include "io/channel-file.h" 32 33 #include "chardev/char-fd.h" 34 #include "chardev/char-io.h" 35 36 /* Called with chr_write_lock held. */ 37 static int fd_chr_write(Chardev *chr, const uint8_t *buf, int len) 38 { 39 FDChardev *s = FD_CHARDEV(chr); 40 41 return io_channel_send(s->ioc_out, buf, len); 42 } 43 44 static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque) 45 { 46 Chardev *chr = CHARDEV(opaque); 47 FDChardev *s = FD_CHARDEV(opaque); 48 int len; 49 uint8_t buf[CHR_READ_BUF_LEN]; 50 ssize_t ret; 51 52 len = sizeof(buf); 53 if (len > s->max_size) { 54 len = s->max_size; 55 } 56 if (len == 0) { 57 return TRUE; 58 } 59 60 ret = qio_channel_read( 61 chan, (gchar *)buf, len, NULL); 62 if (ret == 0) { 63 remove_fd_in_watch(chr); 64 qemu_chr_be_event(chr, CHR_EVENT_CLOSED); 65 return FALSE; 66 } 67 if (ret > 0) { 68 qemu_chr_be_write(chr, buf, ret); 69 } 70 71 return TRUE; 72 } 73 74 static int fd_chr_read_poll(void *opaque) 75 { 76 Chardev *chr = CHARDEV(opaque); 77 FDChardev *s = FD_CHARDEV(opaque); 78 79 s->max_size = qemu_chr_be_can_write(chr); 80 return s->max_size; 81 } 82 83 static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond) 84 { 85 FDChardev *s = FD_CHARDEV(chr); 86 return qio_channel_create_watch(s->ioc_out, cond); 87 } 88 89 static void fd_chr_update_read_handler(Chardev *chr) 90 { 91 FDChardev *s = FD_CHARDEV(chr); 92 93 remove_fd_in_watch(chr); 94 if (s->ioc_in) { 95 chr->gsource = io_add_watch_poll(chr, s->ioc_in, 96 fd_chr_read_poll, 97 fd_chr_read, chr, 98 chr->gcontext); 99 } 100 } 101 102 static void char_fd_finalize(Object *obj) 103 { 104 Chardev *chr = CHARDEV(obj); 105 FDChardev *s = FD_CHARDEV(obj); 106 107 remove_fd_in_watch(chr); 108 if (s->ioc_in) { 109 object_unref(OBJECT(s->ioc_in)); 110 } 111 if (s->ioc_out) { 112 object_unref(OBJECT(s->ioc_out)); 113 } 114 115 qemu_chr_be_event(chr, CHR_EVENT_CLOSED); 116 } 117 118 int qmp_chardev_open_file_source(char *src, int flags, Error **errp) 119 { 120 int fd = -1; 121 122 TFR(fd = qemu_open(src, flags, 0666)); 123 if (fd == -1) { 124 error_setg_file_open(errp, errno, src); 125 } 126 return fd; 127 } 128 129 /* open a character device to a unix fd */ 130 void qemu_chr_open_fd(Chardev *chr, 131 int fd_in, int fd_out) 132 { 133 FDChardev *s = FD_CHARDEV(chr); 134 char *name; 135 136 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in)); 137 name = g_strdup_printf("chardev-file-in-%s", chr->label); 138 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name); 139 g_free(name); 140 s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out)); 141 name = g_strdup_printf("chardev-file-out-%s", chr->label); 142 qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name); 143 g_free(name); 144 qemu_set_nonblock(fd_out); 145 } 146 147 static void char_fd_class_init(ObjectClass *oc, void *data) 148 { 149 ChardevClass *cc = CHARDEV_CLASS(oc); 150 151 cc->chr_add_watch = fd_chr_add_watch; 152 cc->chr_write = fd_chr_write; 153 cc->chr_update_read_handler = fd_chr_update_read_handler; 154 } 155 156 static const TypeInfo char_fd_type_info = { 157 .name = TYPE_CHARDEV_FD, 158 .parent = TYPE_CHARDEV, 159 .instance_size = sizeof(FDChardev), 160 .instance_finalize = char_fd_finalize, 161 .class_init = char_fd_class_init, 162 .abstract = true, 163 }; 164 165 static void register_types(void) 166 { 167 type_register_static(&char_fd_type_info); 168 } 169 170 type_init(register_types); 171