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