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Add a workaround for broken MariaDB clients which overwrite SIGPIPE handler #196

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Add a workaround for broken MariaDB clients which overwrite SIGPIPE handler #196

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Commits on Sep 6, 2023

  1. Add a workaround for broken MariaDB clients which overwrite SIGPIPE h… 

    …andler

MariaDB Connector/C 3.0.0 in function mysql_server_init() for non-Windows
systems started setting SIGPIPE handler to SIG_IGN. This breaks Perl
applications which installed its own SIGPIPE signal handler.

As a workaround use Perl rsignal_save() function to save existing SIGPIPE
handler before calling mysql_server_init() and after that restore saved
handler via Perl rsignal_restore() function.

Add a test which verifies that DBI->connect() which calls DBD::MariaDB's
mariadb_dr_connect() function and which calls mysql_server_init(), does not
overwrite $SIG{PIPE} handler set in Perl code.

Fixes: perl5-dbi#170
See: http://jira.mariadb.org/browse/CONC-591
    @pali
    pali committed Sep 6, 2023
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