[Bug 149] shell history file is overwritten after every command

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=149





--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com>  2009-03-22 18:56:46 UTC ---
Created an attachment (id=181)
 --> (https://bugs.busybox.net/attachment.cgi?id=181)
Patch: make history saving/loading concurrent-safe

Please try this patch.

It makes the following changes:
* all history writes always append (not overwrite) history files
* they reload history if they detect that file length has changed since last
write
* they trim history file only when it grows 4 times longer thna MAXLINES
* they do this atomically by creating new file and renaming it to old.


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