readdir()のd_reclen
readdir()が返すdirentの d_reclenフィールドなんだけど、ナんのサイズなんだろうとか、今まで気にもしていなかったんだけど気になりだすと気になって仕方ない。
_example.so:: inode: 2007169, offset: 2147483647, len: 24, type: regula
example.c:: inode: 2007166, offset: 446725204, len: 24, type: regula
example.i:: inode: 2007167, offset: 1825080369, len: 24, type: regula
example.py:: inode: 2007168, offset: 225954371, len: 24, type: regula
example_wrap.c:: inode: 2007165, offset: 635765763, len: 28, type: regula
delegate_test.cs:: inode: 2007176, offset: 844397602, len: 28, type: regula
try.cs:: inode: 2007180, offset: 1850912454, len: 20, type: regulaてな感じ（きっと勘のいい人なら既にここでわかってしまうんだろう・・・）。
-rwxr-xr-x 1 kuro kuro 35126 2007-10-09 12:08 _example.so -rw-r--r-- 1 kuro kuro 236 2007-10-09 12:01 example.c -rw-r--r-- 1 kuro kuro 304 2007-10-09 12:08 example.i -rw-r--r-- 1 kuro kuro 1674 2007-10-09 15:50 example.py -rw-r--r-- 1 kuro kuro 95360 2007-10-09 15:50 example_wrap.c -rw-r--r-- 1 kuro kuro 198 2007-10-11 11:06 decimal.cs -rw-r--r-- 1 kuro kuro 351 2007-10-11 11:29 delegate_test.cs
実ファイルサイズとは全然関係なさそう。悩む前にカーネルソースを見てしまった。
// fs/readdir.c - line 149 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(long));
なんだよdirent自体のサイズか。これって record length・・・というのか。。。 entlenとか。。。いや、もっとわかんないか。
確かにこうなった。
D:: inode: 1419992, offset: 1583043187, reclen: 16, type: direct
DD:: inode: 1419993, offset: 1666283364, reclen: 16, type: direct
DDD:: inode: 1419994, offset: 21093361, reclen: 16, type: direct
DDDD:: inode: 1419995, offset: 2147483647, reclen: 16, type: direct
DDDDD:: inode: 1419996, offset: 934741300, reclen: 20, type: direct
DDDDDD:: inode: 1419997, offset: 923284620, reclen: 20, type: direct
DDDDDDD:: inode: 1419998, offset: 1808362381, reclen: 20, type: direct
DDDDDDDD:: inode: 1419999, offset: 1447304835, reclen: 20, type: direct
DDDDDDDDD:: inode: 1420000, offset: 1810308308, reclen: 24, type: direct
DDDDDDDDDD:: inode: 1420001, offset: 902093765, reclen: 24, type: direct
DDDDDDDDDDD:: inode: 1420002, offset: 2050576679, reclen: 24, type: direct
DDDDDDDDDDDD:: inode: 1420003, offset: 1441011620, reclen: 24, type: direct
DDDDDDDDDDDDD:: inode: 1420004, offset: 1560707401, reclen: 28, type: direct
DDDDDDDDDDDDDD:: inode: 1420005, offset: 264453376, reclen: 28, type: direct
DDDDDDDDDDDDDDD:: inode: 1420006, offset: 2012088305, reclen: 28, type: direct
DDDDDDDDDDDDDDDD:: inode: 1420007, offset: 545399702, reclen: 28, type: direct
DDDDDDDDDDDDDDDDD:: inode: 1420008, offset: 1349153386, reclen: 32, type: direct
DDDDDDDDDDDDDDDDDD:: inode: 1420009, offset: 1304388095, reclen: 32, type: direct
DDDDDDDDDDDDDDDDDDD:: inode: 1420010, offset: 15462277, reclen: 32, type: direct
DDDDDDDDDDDDDDDDDDDD:: inode: 1420011, offset: 2042488419, reclen: 32, type: direct
DDDDDDDDDDDDDDDDDDDDD:: inode: 1420012, offset: 908934656, reclen: 36, type: direct
DDDDDDDDDDDDDDDDDDDDDD:: inode: 1420013, offset: 1049386901, reclen: 36, type: direct
DDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420014, offset: 2016688392, reclen: 36, type: direct
DDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420015, offset: 838188875, reclen: 36, type: direct
DDDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420016, offset: 111327874, reclen: 40, type: direct
DDDDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420017, offset: 1490345728, reclen: 40, type: direct
DDDDDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420018, offset: 686265667, reclen: 40, type: direct
DDDDDDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420019, offset: 1130391025, reclen: 40, type: direct
DDDDDDDDDDDDDDDDDDDDDDDDDDDDD:: inode: 1420020, offset: 1217789290, reclen: 44, type: directもう少し悩んでから解答ミロよ＞自分。
とか思って余計に自分が情けなくなった。
追記：
更に、manを見ると
unsigned short d_reclen; /* length of this record */
書いてあるじゃん・・・
もっともっと自分が情けなくなった。
