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 #include "qemu/osdep.h"
  25 #include "qapi/error.h"
  26 #include "chardev/char.h"
  27
  28 #ifdef _WIN32
  29 #include "chardev/char-win.h"
  30 #else
  31 #include "chardev/char-fd.h"
  32 #endif
  33
  34 #ifdef _WIN32
  35 #define MAXCONNECT 1
  36 #define NTIMEOUT 5000
  37
  38 static int win_chr_pipe_init(Chardev *chr, const char *filename,
  39                              Error **errp)
  40 {
  41     WinChardev *s = WIN_CHARDEV(chr);
  42     OVERLAPPED ov;
  43     int ret;
  44     DWORD size;
  45     char *openname;
  46
  47     s->fpipe = TRUE;
  48
  49     s->hsend = CreateEvent(NULL, TRUE, FALSE, NULL);
  50     if (!s->hsend) {
  51         error_setg(errp, "Failed CreateEvent");
  52         goto fail;
  53     }
  54     s->hrecv = CreateEvent(NULL, TRUE, FALSE, NULL);
  55     if (!s->hrecv) {
  56         error_setg(errp, "Failed CreateEvent");
  57         goto fail;
  58     }
  59
  60     openname = g_strdup_printf("\\\\.\\pipe\\%s", filename);
  61     s->file = CreateNamedPipe(openname,
  62                               PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
  63                               PIPE_TYPE_BYTE | PIPE_READMODE_BYTE |
  64                               PIPE_WAIT,
  65                               MAXCONNECT, NSENDBUF, NRECVBUF, NTIMEOUT, NULL);
  66     g_free(openname);
  67     if (s->file == INVALID_HANDLE_VALUE) {
  68         error_setg(errp, "Failed CreateNamedPipe (%lu)", GetLastError());
  69         s->file = NULL;
  70         goto fail;
  71     }
  72
  73     ZeroMemory(&ov, sizeof(ov));
  74     ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
  75     ret = ConnectNamedPipe(s->file, &ov);
  76     if (ret) {
  77         error_setg(errp, "Failed ConnectNamedPipe");
  78         goto fail;
  79     }
  80
  81     ret = GetOverlappedResult(s->file, &ov, &size, TRUE);
  82     if (!ret) {
  83         error_setg(errp, "Failed GetOverlappedResult");
  84         if (ov.hEvent) {
  85             CloseHandle(ov.hEvent);
  86             ov.hEvent = NULL;
  87         }
  88         goto fail;
  89     }
  90
  91     if (ov.hEvent) {
  92         CloseHandle(ov.hEvent);
  93         ov.hEvent = NULL;
  94     }
  95     qemu_add_polling_cb(win_chr_pipe_poll, chr);
  96     return 0;
  97
  98  fail:
  99     return -1;
 100 }
 101
 102 static void qemu_chr_open_pipe(Chardev *chr,
 103                                ChardevBackend *backend,
 104                                bool *be_opened,
 105                                Error **errp)
 106 {
 107     ChardevHostdev *opts = backend->u.pipe.data;
 108     const char *filename = opts->device;
 109
 110     if (win_chr_pipe_init(chr, filename, errp) < 0) {
 111         return;
 112     }
 113 }
 114
 115 #else
 116
 117 static void qemu_chr_open_pipe(Chardev *chr,
 118                                ChardevBackend *backend,
 119                                bool *be_opened,
 120                                Error **errp)
 121 {
 122     ChardevHostdev *opts = backend->u.pipe.data;
 123     int fd_in, fd_out;
 124     char *filename_in;
 125     char *filename_out;
 126     const char *filename = opts->device;
 127
 128     filename_in = g_strdup_printf("%s.in", filename);
 129     filename_out = g_strdup_printf("%s.out", filename);
 130     TFR(fd_in = qemu_open(filename_in, O_RDWR | O_BINARY));
 131     TFR(fd_out = qemu_open(filename_out, O_RDWR | O_BINARY));
 132     g_free(filename_in);
 133     g_free(filename_out);
 134     if (fd_in < 0 || fd_out < 0) {
 135         if (fd_in >= 0) {
 136             close(fd_in);
 137         }
 138         if (fd_out >= 0) {
 139             close(fd_out);
 140         }
 141         TFR(fd_in = fd_out = qemu_open(filename, O_RDWR | O_BINARY));
 142         if (fd_in < 0) {
 143             error_setg_file_open(errp, errno, filename);
 144             return;
 145         }
 146     }
 147     qemu_chr_open_fd(chr, fd_in, fd_out);
 148 }
 149
 150 #endif /* !_WIN32 */
 151
 152 static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
 153                                 Error **errp)
 154 {
 155     const char *device = qemu_opt_get(opts, "path");
 156     ChardevHostdev *dev;
 157
 158     if (device == NULL) {
 159         error_setg(errp, "chardev: pipe: no device path given");
 160         return;
 161     }
 162     backend->type = CHARDEV_BACKEND_KIND_PIPE;
 163     dev = backend->u.pipe.data = g_new0(ChardevHostdev, 1);
 164     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(dev));
 165     dev->device = g_strdup(device);
 166 }
 167
 168 static void char_pipe_class_init(ObjectClass *oc, void *data)
 169 {
 170     ChardevClass *cc = CHARDEV_CLASS(oc);
 171
 172     cc->parse = qemu_chr_parse_pipe;
 173     cc->open = qemu_chr_open_pipe;
 174 }
 175
 176 static const TypeInfo char_pipe_type_info = {
 177     .name = TYPE_CHARDEV_PIPE,
 178 #ifdef _WIN32
 179     .parent = TYPE_CHARDEV_WIN,
 180 #else
 181     .parent = TYPE_CHARDEV_FD,
 182 #endif
 183     .class_init = char_pipe_class_init,
 184 };
 185
 186 static void register_types(void)
 187 {
 188     type_register_static(&char_pipe_type_info);
 189 }
 190
 191 type_init(register_types);