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