LXR qemu/chardev/char-file.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 "qemu-common.h"
  27#include "chardev/char.h"
  28
  29#ifdef _WIN32
  30#include "chardev/char-win.h"
  31#else
  32#include "chardev/char-fd.h"
  33#endif
  34
  35static void qmp_chardev_open_file(Chardev *chr,
  36                                  ChardevBackend *backend,
  37                                  bool *be_opened,
  38                                  Error **errp)
  39{
  40    ChardevFile *file = backend->u.file.data;
  41#ifdef _WIN32
  42    HANDLE out;
  43    DWORD accessmode;
  44    DWORD flags;
  45
  46    if (file->has_in) {
  47        error_setg(errp, "input file not supported");
  48        return;
  49    }
  50
  51    if (file->has_append && file->append) {
  52        /* Append to file if it already exists. */
  53        accessmode = FILE_GENERIC_WRITE & ~FILE_WRITE_DATA;
  54        flags = OPEN_ALWAYS;
  55    } else {
  56        /* Truncate file if it already exists. */
  57        accessmode = GENERIC_WRITE;
  58        flags = CREATE_ALWAYS;
  59    }
  60
  61    out = CreateFile(file->out, accessmode, FILE_SHARE_READ, NULL, flags,
  62                     FILE_ATTRIBUTE_NORMAL, NULL);
  63    if (out == INVALID_HANDLE_VALUE) {
  64        error_setg(errp, "open %s failed", file->out);
  65        return;
  66    }
  67
  68    win_chr_set_file(chr, out, false);
  69#else
  70    int flags, in = -1, out;
  71
  72    flags = O_WRONLY | O_CREAT | O_BINARY;
  73    if (file->has_append && file->append) {
  74        flags |= O_APPEND;
  75    } else {
  76        flags |= O_TRUNC;
  77    }
  78
  79    out = qmp_chardev_open_file_source(file->out, flags, errp);
  80    if (out < 0) {
  81        return;
  82    }
  83
  84    if (file->has_in) {
  85        flags = O_RDONLY;
  86        in = qmp_chardev_open_file_source(file->in, flags, errp);
  87        if (in < 0) {
  88            qemu_close(out);
  89            return;
  90        }
  91    }
  92
  93    qemu_chr_open_fd(chr, in, out);
  94#endif
  95}
  96
  97static void qemu_chr_parse_file_out(QemuOpts *opts, ChardevBackend *backend,
  98                                    Error **errp)
  99{
 100    const char *path = qemu_opt_get(opts, "path");
 101    ChardevFile *file;
 102
 103    backend->type = CHARDEV_BACKEND_KIND_FILE;
 104    if (path == NULL) {
 105        error_setg(errp, "chardev: file: no filename given");
 106        return;
 107    }
 108    file = backend->u.file.data = g_new0(ChardevFile, 1);
 109    qemu_chr_parse_common(opts, qapi_ChardevFile_base(file));
 110    file->out = g_strdup(path);
 111
 112    file->has_append = true;
 113    file->append = qemu_opt_get_bool(opts, "append", false);
 114}
 115
 116static void char_file_class_init(ObjectClass *oc, void *data)
 117{
 118    ChardevClass *cc = CHARDEV_CLASS(oc);
 119
 120    cc->parse = qemu_chr_parse_file_out;
 121    cc->open = qmp_chardev_open_file;
 122}
 123
 124static const TypeInfo char_file_type_info = {
 125    .name = TYPE_CHARDEV_FILE,
 126#ifdef _WIN32
 127    .parent = TYPE_CHARDEV_WIN,
 128#else
 129    .parent = TYPE_CHARDEV_FD,
 130#endif
 131    .class_init = char_file_class_init,
 132};
 133
 134static void register_types(void)
 135{
 136    type_register_static(&char_file_type_info);
 137}
 138
 139type_init(register_types);
 140