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Date: Wed, 10 Dec 2014 17:17:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: [PATCH] Append to input history file instead of overwriting it
In-reply-to: <54887AB5.3000101@redhat.com>
To: Pedro Alves <palves@redhat.com>
Cc: patrick@parcs.ath.cx, gdb-patches@sourceware.org
Reply-to: Eli Zaretskii <eliz@gnu.org>
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References: <1417226462-11254-1-git-send-email-patrick@parcs.ath.cx> <54808956.9070507@redhat.com> <alpine.DEB.2.11.1412041913060.2232@idea> <54818CCE.5010701@redhat.com> <CA+C-WL8tCiJGO9FK8mxL+5hDh1afc6JeuBknUYeY+P8yCAF+dg@mail.gmail.com> <54887AB5.3000101@redhat.com>
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> Date: Wed, 10 Dec 2014 16:54:13 +0000
> From: Pedro Alves <palves@redhat.com>
> CC: gdb-patches@sourceware.org
> 
> Is it that hard to do though?  How about temporarily renaming the
> history file to something that includes gdb's PID (and would not a
> file name a user would use in practice) while we append
> to it, and then (atomically) rename it back?  Something like:
> 
>  #1 - move $HISTFILE -> $HISTFILE-gdb$PID~
>  #2 - write/append history to $HISTFILE-gdb$PID~
>  #3 - move $HISTFILE-gdb$PID~ -> $HISTFILE

You cannot portably rename a file someone writes to, unless you are
willing to limit this to Posix filesystems.