greenplumn pg_backup_tar 源码
greenplumn pg_backup_tar 代码
文件路径：/src/bin/pg_dump/pg_backup_tar.h
/*
* src/bin/pg_dump/pg_backup_tar.h
*
* TAR Header (see "ustar interchange format" in POSIX 1003.1)
*
* Offset Length Contents
* 0 100 bytes File name ('\0' terminated, 99 maximum length)
* 100 8 bytes File mode (in octal ascii)
* 108 8 bytes User ID (in octal ascii)
* 116 8 bytes Group ID (in octal ascii)
* 124 12 bytes File size (in octal ascii)
* 136 12 bytes Modify time (Unix timestamp in octal ascii)
* 148 8 bytes Header checksum (in octal ascii)
* 156 1 bytes Type flag (see below)
* 157 100 bytes Linkname, if symlink ('\0' terminated, 99 maximum length)
* 257 6 bytes Magic ("ustar\0")
* 263 2 bytes Version ("00")
* 265 32 bytes User name ('\0' terminated, 31 maximum length)
* 297 32 bytes Group name ('\0' terminated, 31 maximum length)
* 329 8 bytes Major device ID (in octal ascii)
* 337 8 bytes Minor device ID (in octal ascii)
* 345 155 bytes File name prefix (not used in our implementation)
* 500 12 bytes Padding
*
* 512 (s+p)bytes File contents, padded out to 512-byte boundary
*/
/* The type flag defines the type of file */
#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compatible */
#define LF_NORMAL '0' /* Normal disk file */
#define LF_LINK '1' /* Link to previously dumped file */
#define LF_SYMLINK '2' /* Symbolic link */
#define LF_CHR '3' /* Character special file */
#define LF_BLK '4' /* Block special file */
#define LF_DIR '5' /* Directory */
#define LF_FIFO '6' /* FIFO special file */
#define LF_CONTIG '7' /* Contiguous file */
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