questions about the implemention of gf_backtrace_fillframes

["C0reFast" <topchenfu@xxxxxx>]

When I trying to listing /tmp in a gluster server. I found that have some bt prefix files like:

[root@xxx# ll /tmp/

ls: cannot access /tmp/btm1RpMm: No such file or directory

total 116

-rw-------  1 root root   129 Jan 13 17:11 bt0tJH3c

-?????????? ? ?    ?        ?            ? btm1RpMm

-rw-------  1 root root   287 Jan 13 17:11 btyDGNO9

drwx------. 2 root root 16384 Oct 19 09:21 lost+found

 

so i checked the source code. found in libglusterfs/src/common-utils.c

in function gf_backtrace_fillframes:

1. call frames = backtrace (array, GF_BACKTRACE_FRAME_COUNT); to get backtrace.

2. save backtrace to a temp file.

3. read backtrace from temp file to btbuf.

so why need writing a temp file instead just doing this in memory?

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