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
  25#include "qemu/osdep.h"
  26#include "qapi/error.h"
  27#include "qemu/module.h"
  28#include "qemu/option.h"
  29#include "chardev/char.h"
  30
  31#ifdef _WIN32
  32#include "chardev/char-win.h"
  33#else
  34#include "chardev/char-fd.h"
  35#endif
  36
  37static void qmp_chardev_open_file(Chardev *chr,
  38                                  ChardevBackend *backend,
  39                                  bool *be_opened,
  40                                  Error **errp)
  41{
  42    ChardevFile *file = backend->u.file.data;
  43#ifdef _WIN32
  44    HANDLE out;
  45    DWORD accessmode;
  46    DWORD flags;
  47
  48    if (file->has_in) {
  49        error_setg(errp, "input file not supported");
  50        return;
  51    }
  52
  53    if (file->has_append && file->append) {
  54        /* Append to file if it already exists. */
  55        accessmode = FILE_GENERIC_WRITE & ~FILE_WRITE_DATA;
  56        flags = OPEN_ALWAYS;
  57    } else {
  58        /* Truncate file if it already exists. */
  59        accessmode = GENERIC_WRITE;
  60        flags = CREATE_ALWAYS;
  61    }
  62
  63    out = CreateFile(file->out, accessmode, FILE_SHARE_READ, NULL, flags,
  64                     FILE_ATTRIBUTE_NORMAL, NULL);
  65    if (out == INVALID_HANDLE_VALUE) {
  66        error_setg(errp, "open %s failed", file->out);
  67        return;
  68    }
  69
  70    win_chr_set_file(chr, out, false);
  71#else
  72    int flags, in = -1, out;
  73
  74    flags = O_WRONLY | O_CREAT | O_BINARY;
  75    if (file->has_append && file->append) {
  76        flags |= O_APPEND;
  77    } else {
  78        flags |= O_TRUNC;
  79    }
  80
  81    out = qmp_chardev_open_file_source(file->out, flags, errp);
  82    if (out < 0) {
  83        return;
  84    }
  85
  86    if (file->has_in) {
  87        flags = O_RDONLY;
  88        in = qmp_chardev_open_file_source(file->in, flags, errp);
  89        if (in < 0) {
  90            qemu_close(out);
  91            return;
  92        }
  93    }
  94
  95    qemu_chr_open_fd(chr, in, out);
  96#endif
  97}
  98
  99static void qemu_chr_parse_file_out(QemuOpts *opts, ChardevBackend *backend,
 100                                    Error **errp)
 101{
 102    const char *path = qemu_opt_get(opts, "path");
 103    ChardevFile *file;
 104
 105    backend->type = CHARDEV_BACKEND_KIND_FILE;
 106    if (path == NULL) {
 107        error_setg(errp, "chardev: file: no filename given");
 108        return;
 109    }
 110    file = backend->u.file.data = g_new0(ChardevFile, 1);
 111    qemu_chr_parse_common(opts, qapi_ChardevFile_base(file));
 112    file->out = g_strdup(path);
 113
 114    file->has_append = true;
 115    file->append = qemu_opt_get_bool(opts, "append", false);
 116}
 117
 118static void char_file_class_init(ObjectClass *oc, void *data)
 119{
 120    ChardevClass *cc = CHARDEV_CLASS(oc);
 121
 122    cc->parse = qemu_chr_parse_file_out;
 123    cc->open = qmp_chardev_open_file;
 124}
 125
 126static const TypeInfo char_file_type_info = {
 127    .name = TYPE_CHARDEV_FILE,
 128#ifdef _WIN32
 129    .parent = TYPE_CHARDEV_WIN,
 130#else
 131    .parent = TYPE_CHARDEV_FD,
 132#endif
 133    .class_init = char_file_class_init,
 134};
 135
 136static void register_types(void)
 137{
 138    type_register_static(&char_file_type_info);
 139}
 140
 141type_init(register_types);
 142