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
  37 static 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
  99 static 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
 118 static 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
 126 static 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
 136 static void register_types(void)
 137 {
 138     type_register_static(&char_file_type_info);
 139 }
 140
 141 type_init(register_types);