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