tree 7f92afc9d6f9031d9dcfded0f8231fd5ee7f16d6
parent 3541bc79d0cfabc0ad155c99bfdad1289f17fec3
author Lasse Collin <lasse.collin@tukaani.org> 1372452485 +0300
committer Lasse Collin <lasse.collin@tukaani.org> 1372452485 +0300

xz: Use the self-pipe trick to avoid a race condition with signals.

It is possible that a signal to set user_abort arrives right
before a blocking system call is made. In this case the call
may block until another signal arrives, while the wanted
behavior is to make xz clean up and exit as soon as possible.

After this commit, the race condition is avoided with the
input side which already uses non-blocking I/O. The output
side still uses blocking I/O and thus has the race condition.