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
  35 static 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
  97 static 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
 116 static 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
 124 static 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
 134 static void register_types(void)
 135 {
 136     type_register_static(&char_file_type_info);
 137 }
 138
 139 type_init(register_types);