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Build farm animals running ancient HPUX and Solaris have a non-standard sigwait() from draft versions of POSIX, so they didn't like commit 7c09d279. To avoid the problem in general, only try to use sigwait() if it's declared by <signal.h> and matches the expected declaration. To select the modern declaration on Solaris (even in non-threaded programs), move -D_POSIX_PTHREAD_SEMANTICS into the right place to affect all translation units. Also fix the error checking. Modern sigwait() doesn't set errno. Thanks to Tom Lane for help with this. Discussion: https://postgr.es/m/3187588.1626136248%40sss.pgh.pa.us
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.