qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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char-file.c (4062B)

      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);