qemu

char-pipe.c (5660B)

---

 /*
  * QEMU System Emulator
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qemu/main-loop.h"
 #include "qemu/module.h"
 #include "qemu/option.h"
 #include "chardev/char.h"
 
 #ifdef _WIN32
 #include "chardev/char-win.h"
 #else
 #include "chardev/char-fd.h"
 #endif
 
 #ifdef _WIN32
 #define MAXCONNECT 1
 #define NTIMEOUT 5000
 
 static int win_chr_pipe_init(Chardev *chr, const char *filename,
                              Error **errp)
 {
     WinChardev *s = WIN_CHARDEV(chr);
     OVERLAPPED ov;
     int ret;
     DWORD size;
     char *openname;
 
     s->fpipe = TRUE;
 
     s->hsend = CreateEvent(NULL, TRUE, FALSE, NULL);
     if (!s->hsend) {
         error_setg(errp, "Failed CreateEvent");
         goto fail;
     }
     s->hrecv = CreateEvent(NULL, TRUE, FALSE, NULL);
     if (!s->hrecv) {
         error_setg(errp, "Failed CreateEvent");
         goto fail;
     }
 
     openname = g_strdup_printf("\\\\.\\pipe\\%s", filename);
     s->file = CreateNamedPipe(openname,
                               PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
                               PIPE_TYPE_BYTE | PIPE_READMODE_BYTE |
                               PIPE_WAIT,
                               MAXCONNECT, NSENDBUF, NRECVBUF, NTIMEOUT, NULL);
     g_free(openname);
     if (s->file == INVALID_HANDLE_VALUE) {
         error_setg_win32(errp, GetLastError(), "Failed CreateNamedPipe");
         s->file = NULL;
         goto fail;
     }
 
     ZeroMemory(&ov, sizeof(ov));
     ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
     ret = ConnectNamedPipe(s->file, &ov);
     if (ret) {
         error_setg(errp, "Failed ConnectNamedPipe");
         goto fail;
     }
 
     ret = GetOverlappedResult(s->file, &ov, &size, TRUE);
     if (!ret) {
         error_setg(errp, "Failed GetOverlappedResult");
         if (ov.hEvent) {
             CloseHandle(ov.hEvent);
             ov.hEvent = NULL;
         }
         goto fail;
     }
 
     if (ov.hEvent) {
         CloseHandle(ov.hEvent);
         ov.hEvent = NULL;
     }
     qemu_add_polling_cb(win_chr_pipe_poll, chr);
     return 0;
 
  fail:
     return -1;
 }
 
 static void qemu_chr_open_pipe(Chardev *chr,
                                ChardevBackend *backend,
                                bool *be_opened,
                                Error **errp)
 {
     ChardevHostdev *opts = backend->u.pipe.data;
     const char *filename = opts->device;
 
     if (win_chr_pipe_init(chr, filename, errp) < 0) {
         return;
     }
 }
 
 #else
 
 static void qemu_chr_open_pipe(Chardev *chr,
                                ChardevBackend *backend,
                                bool *be_opened,
                                Error **errp)
 {
     ChardevHostdev *opts = backend->u.pipe.data;
     int fd_in, fd_out;
     char *filename_in;
     char *filename_out;
     const char *filename = opts->device;
 
     filename_in = g_strdup_printf("%s.in", filename);
     filename_out = g_strdup_printf("%s.out", filename);
     TFR(fd_in = qemu_open_old(filename_in, O_RDWR | O_BINARY));
     TFR(fd_out = qemu_open_old(filename_out, O_RDWR | O_BINARY));
     g_free(filename_in);
     g_free(filename_out);
     if (fd_in < 0 || fd_out < 0) {
         if (fd_in >= 0) {
             close(fd_in);
         }
         if (fd_out >= 0) {
             close(fd_out);
         }
         TFR(fd_in = fd_out = qemu_open_old(filename, O_RDWR | O_BINARY));
         if (fd_in < 0) {
             error_setg_file_open(errp, errno, filename);
             return;
         }
     }
     qemu_chr_open_fd(chr, fd_in, fd_out);
 }
 
 #endif /* !_WIN32 */
 
 static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
                                 Error **errp)
 {
     const char *device = qemu_opt_get(opts, "path");
     ChardevHostdev *dev;
 
     if (device == NULL) {
         error_setg(errp, "chardev: pipe: no device path given");
         return;
     }
     backend->type = CHARDEV_BACKEND_KIND_PIPE;
     dev = backend->u.pipe.data = g_new0(ChardevHostdev, 1);
     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(dev));
     dev->device = g_strdup(device);
 }
 
 static void char_pipe_class_init(ObjectClass *oc, void *data)
 {
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
     cc->parse = qemu_chr_parse_pipe;
     cc->open = qemu_chr_open_pipe;
 }
 
 static const TypeInfo char_pipe_type_info = {
     .name = TYPE_CHARDEV_PIPE,
 #ifdef _WIN32
     .parent = TYPE_CHARDEV_WIN,
 #else
     .parent = TYPE_CHARDEV_FD,
 #endif
     .class_init = char_pipe_class_init,
 };
 
 static void register_types(void)
 {
     type_register_static(&char_pipe_type_info);
 }
 
 type_init(register_types);