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11-03-2009, 03:22 AM
| #1 |
| Registered User Join Date: May 2008
Posts: 27
| Identifying sparse files programatically in C Thanks |
| rohan_ak1 is offline |  |
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11-03-2009, 01:06 PM
| #2 |
| Registered User Join Date: Nov 2008
Posts: 75
| You should read more about stat, because that's the system call that you need. |
| MisterIO is offline | |
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11-12-2009, 10:15 AM
| #3 |
| Registered User Join Date: May 2009
Posts: 1
| Look at the stat structure. One crude heurestic is that if the size of the file (st_size) is greater than the number of blocks (st_blocks) multipied by the size of a block, then you have a sparse file. The GNU core utilities which support the --sparse option use this heuristic. From copy.c: Code: #if HAVE_STRUCT_STAT_ST_BLOCKS
/* Use a heuristic to determine whether SRC_NAME contains any sparse
blocks. If the file has fewer blocks than would normally be
needed for a file of its size, then at least one of the blocks in
the file is a hole. */
if (x->sparse_mode == SPARSE_AUTO && S_ISREG (src_open_sb.st_mode)
&& ST_NBLOCKS (src_open_sb) < src_open_sb.st_size / ST_NBLOCKSIZE)
make_holes = true;
#endif
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