include/migration/qemu-file.h

   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 #ifndef QEMU_FILE_H
  25 #define QEMU_FILE_H 1
  26
  27 /* This function writes a chunk of data to a file at the given position.
  28  * The pos argument can be ignored if the file is only being used for
  29  * streaming.  The handler should try to write all of the data it can.
  30  */
  31 typedef int (QEMUFilePutBufferFunc)(void *opaque, const uint8_t *buf,
  32                                     int64_t pos, int size);
  33
  34 /* Read a chunk of data from a file at the given position.  The pos argument
  35  * can be ignored if the file is only be used for streaming.  The number of
  36  * bytes actually read should be returned.
  37  */
  38 typedef int (QEMUFileGetBufferFunc)(void *opaque, uint8_t *buf,
  39                                     int64_t pos, int size);
  40
  41 /* Close a file
  42  *
  43  * Return negative error number on error, 0 or positive value on success.
  44  *
  45  * The meaning of return value on success depends on the specific back-end being
  46  * used.
  47  */
  48 typedef int (QEMUFileCloseFunc)(void *opaque);
  49
  50 /* Called to return the OS file descriptor associated to the QEMUFile.
  51  */
  52 typedef int (QEMUFileGetFD)(void *opaque);
  53
  54 /*
  55  * This function writes an iovec to file.
  56  */
  57 typedef ssize_t (QEMUFileWritevBufferFunc)(void *opaque, struct iovec *iov,
  58                                            int iovcnt, int64_t pos);
  59
  60 typedef struct QEMUFileOps {
  61     QEMUFilePutBufferFunc *put_buffer;
  62     QEMUFileGetBufferFunc *get_buffer;
  63     QEMUFileCloseFunc *close;
  64     QEMUFileGetFD *get_fd;
  65     QEMUFileWritevBufferFunc *writev_buffer;
  66 } QEMUFileOps;
  67
  68 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
  69 QEMUFile *qemu_fopen(const char *filename, const char *mode);
  70 QEMUFile *qemu_fdopen(int fd, const char *mode);
  71 QEMUFile *qemu_fopen_socket(int fd, const char *mode);
  72 QEMUFile *qemu_popen_cmd(const char *command, const char *mode);
  73 int qemu_get_fd(QEMUFile *f);
  74 int qemu_fclose(QEMUFile *f);
  75 int64_t qemu_ftell(QEMUFile *f);
  76 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);
  77 void qemu_put_byte(QEMUFile *f, int v);
  78 /*
  79  * put_buffer without copying the buffer.
  80  * The buffer should be available till it is sent asynchronously.
  81  */
  82 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size);
  83 bool qemu_file_mode_is_not_valid(const char *mode);
  84
  85 static inline void qemu_put_ubyte(QEMUFile *f, unsigned int v)
  86 {
  87     qemu_put_byte(f, (int)v);
  88 }
  89
  90 #define qemu_put_sbyte qemu_put_byte
  91
  92 void qemu_put_be16(QEMUFile *f, unsigned int v);
  93 void qemu_put_be32(QEMUFile *f, unsigned int v);
  94 void qemu_put_be64(QEMUFile *f, uint64_t v);
  95 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size);
  96 int qemu_get_byte(QEMUFile *f);
  97 void qemu_update_position(QEMUFile *f, size_t size);
  98
  99 static inline unsigned int qemu_get_ubyte(QEMUFile *f)
 100 {
 101     return (unsigned int)qemu_get_byte(f);
 102 }
 103
 104 #define qemu_get_sbyte qemu_get_byte
 105
 106 unsigned int qemu_get_be16(QEMUFile *f);
 107 unsigned int qemu_get_be32(QEMUFile *f);
 108 uint64_t qemu_get_be64(QEMUFile *f);
 109
 110 int qemu_file_rate_limit(QEMUFile *f);
 111 void qemu_file_reset_rate_limit(QEMUFile *f);
 112 void qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate);
 113 int64_t qemu_file_get_rate_limit(QEMUFile *f);
 114 int qemu_file_get_error(QEMUFile *f);
 115 void qemu_fflush(QEMUFile *f);
 116
 117 static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
 118 {
 119     qemu_put_be64(f, *pv);
 120 }
 121
 122 static inline void qemu_put_be32s(QEMUFile *f, const uint32_t *pv)
 123 {
 124     qemu_put_be32(f, *pv);
 125 }
 126
 127 static inline void qemu_put_be16s(QEMUFile *f, const uint16_t *pv)
 128 {
 129     qemu_put_be16(f, *pv);
 130 }
 131
 132 static inline void qemu_put_8s(QEMUFile *f, const uint8_t *pv)
 133 {
 134     qemu_put_byte(f, *pv);
 135 }
 136
 137 static inline void qemu_get_be64s(QEMUFile *f, uint64_t *pv)
 138 {
 139     *pv = qemu_get_be64(f);
 140 }
 141
 142 static inline void qemu_get_be32s(QEMUFile *f, uint32_t *pv)
 143 {
 144     *pv = qemu_get_be32(f);
 145 }
 146
 147 static inline void qemu_get_be16s(QEMUFile *f, uint16_t *pv)
 148 {
 149     *pv = qemu_get_be16(f);
 150 }
 151
 152 static inline void qemu_get_8s(QEMUFile *f, uint8_t *pv)
 153 {
 154     *pv = qemu_get_byte(f);
 155 }
 156
 157 // Signed versions for type safety
 158 static inline void qemu_put_sbuffer(QEMUFile *f, const int8_t *buf, int size)
 159 {
 160     qemu_put_buffer(f, (const uint8_t *)buf, size);
 161 }
 162
 163 static inline void qemu_put_sbe16(QEMUFile *f, int v)
 164 {
 165     qemu_put_be16(f, (unsigned int)v);
 166 }
 167
 168 static inline void qemu_put_sbe32(QEMUFile *f, int v)
 169 {
 170     qemu_put_be32(f, (unsigned int)v);
 171 }
 172
 173 static inline void qemu_put_sbe64(QEMUFile *f, int64_t v)
 174 {
 175     qemu_put_be64(f, (uint64_t)v);
 176 }
 177
 178 static inline size_t qemu_get_sbuffer(QEMUFile *f, int8_t *buf, int size)
 179 {
 180     return qemu_get_buffer(f, (uint8_t *)buf, size);
 181 }
 182
 183 static inline int qemu_get_sbe16(QEMUFile *f)
 184 {
 185     return (int)qemu_get_be16(f);
 186 }
 187
 188 static inline int qemu_get_sbe32(QEMUFile *f)
 189 {
 190     return (int)qemu_get_be32(f);
 191 }
 192
 193 static inline int64_t qemu_get_sbe64(QEMUFile *f)
 194 {
 195     return (int64_t)qemu_get_be64(f);
 196 }
 197
 198 static inline void qemu_put_s8s(QEMUFile *f, const int8_t *pv)
 199 {
 200     qemu_put_8s(f, (const uint8_t *)pv);
 201 }
 202
 203 static inline void qemu_put_sbe16s(QEMUFile *f, const int16_t *pv)
 204 {
 205     qemu_put_be16s(f, (const uint16_t *)pv);
 206 }
 207
 208 static inline void qemu_put_sbe32s(QEMUFile *f, const int32_t *pv)
 209 {
 210     qemu_put_be32s(f, (const uint32_t *)pv);
 211 }
 212
 213 static inline void qemu_put_sbe64s(QEMUFile *f, const int64_t *pv)
 214 {
 215     qemu_put_be64s(f, (const uint64_t *)pv);
 216 }
 217
 218 static inline void qemu_get_s8s(QEMUFile *f, int8_t *pv)
 219 {
 220     qemu_get_8s(f, (uint8_t *)pv);
 221 }
 222
 223 static inline void qemu_get_sbe16s(QEMUFile *f, int16_t *pv)
 224 {
 225     qemu_get_be16s(f, (uint16_t *)pv);
 226 }
 227
 228 static inline void qemu_get_sbe32s(QEMUFile *f, int32_t *pv)
 229 {
 230     qemu_get_be32s(f, (uint32_t *)pv);
 231 }
 232
 233 static inline void qemu_get_sbe64s(QEMUFile *f, int64_t *pv)
 234 {
 235     qemu_get_be64s(f, (uint64_t *)pv);
 236 }
 237 #endif