chardev/char-pipe.c

   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 "qapi/error.h"
  28 #include "qemu/main-loop.h"
  29 #include "qemu/module.h"
  30 #include "qemu/option.h"
  31 #include "chardev/char.h"
  32
  33 #ifdef _WIN32
  34 #include "chardev/char-win.h"
  35 #else
  36 #include "chardev/char-fd.h"
  37 #endif
  38
  39 #ifdef _WIN32
  40 #define MAXCONNECT 1
  41 #define NTIMEOUT 5000
  42
  43 static int win_chr_pipe_init(Chardev *chr, const char *filename,
  44                              Error **errp)
  45 {
  46     WinChardev *s = WIN_CHARDEV(chr);
  47     OVERLAPPED ov;
  48     int ret;
  49     DWORD size;
  50     char *openname;
  51
  52     s->fpipe = TRUE;
  53
  54     s->hsend = CreateEvent(NULL, TRUE, FALSE, NULL);
  55     if (!s->hsend) {
  56         error_setg(errp, "Failed CreateEvent");
  57         goto fail;
  58     }
  59     s->hrecv = CreateEvent(NULL, TRUE, FALSE, NULL);
  60     if (!s->hrecv) {
  61         error_setg(errp, "Failed CreateEvent");
  62         goto fail;
  63     }
  64
  65     openname = g_strdup_printf("\\\\.\\pipe\\%s", filename);
  66     s->file = CreateNamedPipe(openname,
  67                               PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
  68                               PIPE_TYPE_BYTE | PIPE_READMODE_BYTE |
  69                               PIPE_WAIT,
  70                               MAXCONNECT, NSENDBUF, NRECVBUF, NTIMEOUT, NULL);
  71     g_free(openname);
  72     if (s->file == INVALID_HANDLE_VALUE) {
  73         error_setg_win32(errp, GetLastError(), "Failed CreateNamedPipe");
  74         s->file = NULL;
  75         goto fail;
  76     }
  77
  78     ZeroMemory(&ov, sizeof(ov));
  79     ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
  80     ret = ConnectNamedPipe(s->file, &ov);
  81     if (ret) {
  82         error_setg(errp, "Failed ConnectNamedPipe");
  83         goto fail;
  84     }
  85
  86     ret = GetOverlappedResult(s->file, &ov, &size, TRUE);
  87     if (!ret) {
  88         error_setg(errp, "Failed GetOverlappedResult");
  89         if (ov.hEvent) {
  90             CloseHandle(ov.hEvent);
  91             ov.hEvent = NULL;
  92         }
  93         goto fail;
  94     }
  95
  96     if (ov.hEvent) {
  97         CloseHandle(ov.hEvent);
  98         ov.hEvent = NULL;
  99     }
 100     qemu_add_polling_cb(win_chr_pipe_poll, chr);
 101     return 0;
 102
 103  fail:
 104     return -1;
 105 }
 106
 107 static void qemu_chr_open_pipe(Chardev *chr,
 108                                ChardevBackend *backend,
 109                                bool *be_opened,
 110                                Error **errp)
 111 {
 112     ChardevHostdev *opts = backend->u.pipe.data;
 113     const char *filename = opts->device;
 114
 115     if (win_chr_pipe_init(chr, filename, errp) < 0) {
 116         return;
 117     }
 118 }
 119
 120 #else
 121
 122 static void qemu_chr_open_pipe(Chardev *chr,
 123                                ChardevBackend *backend,
 124                                bool *be_opened,
 125                                Error **errp)
 126 {
 127     ChardevHostdev *opts = backend->u.pipe.data;
 128     int fd_in, fd_out;
 129     char *filename_in;
 130     char *filename_out;
 131     const char *filename = opts->device;
 132
 133     filename_in = g_strdup_printf("%s.in", filename);
 134     filename_out = g_strdup_printf("%s.out", filename);
 135     TFR(fd_in = qemu_open(filename_in, O_RDWR | O_BINARY));
 136     TFR(fd_out = qemu_open(filename_out, O_RDWR | O_BINARY));
 137     g_free(filename_in);
 138     g_free(filename_out);
 139     if (fd_in < 0 || fd_out < 0) {
 140         if (fd_in >= 0) {
 141             close(fd_in);
 142         }
 143         if (fd_out >= 0) {
 144             close(fd_out);
 145         }
 146         TFR(fd_in = fd_out = qemu_open(filename, O_RDWR | O_BINARY));
 147         if (fd_in < 0) {
 148             error_setg_file_open(errp, errno, filename);
 149             return;
 150         }
 151     }
 152     qemu_chr_open_fd(chr, fd_in, fd_out);
 153 }
 154
 155 #endif /* !_WIN32 */
 156
 157 static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
 158                                 Error **errp)
 159 {
 160     const char *device = qemu_opt_get(opts, "path");
 161     ChardevHostdev *dev;
 162
 163     if (device == NULL) {
 164         error_setg(errp, "chardev: pipe: no device path given");
 165         return;
 166     }
 167     backend->type = CHARDEV_BACKEND_KIND_PIPE;
 168     dev = backend->u.pipe.data = g_new0(ChardevHostdev, 1);
 169     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(dev));
 170     dev->device = g_strdup(device);
 171 }
 172
 173 static void char_pipe_class_init(ObjectClass *oc, void *data)
 174 {
 175     ChardevClass *cc = CHARDEV_CLASS(oc);
 176
 177     cc->parse = qemu_chr_parse_pipe;
 178     cc->open = qemu_chr_open_pipe;
 179 }
 180
 181 static const TypeInfo char_pipe_type_info = {
 182     .name = TYPE_CHARDEV_PIPE,
 183 #ifdef _WIN32
 184     .parent = TYPE_CHARDEV_WIN,
 185 #else
 186     .parent = TYPE_CHARDEV_FD,
 187 #endif
 188     .class_init = char_pipe_class_init,
 189 };
 190
 191 static void register_types(void)
 192 {
 193     type_register_static(&char_pipe_type_info);
 194 }
 195
 196 type_init(register_types);