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We had a complaint that the postmaster fails to start if the invoking program closes stdin. That happens because count_usable_fds expects to be able to dup(0), and if it can't, we conclude there are no free FDs and go belly-up. So far as I can find, though, there is no other place in the server that touches stdin, and it's not unreasonable to expect that a daemon wouldn't use that file. As a simple improvement, let's dup FD 2 (stderr) instead. Unlike stdin, it *is* reasonable for us to expect that stderr be open; even if we are configured not to touch it, common libraries such as libc might try to write error messages there. Per gripe from Mario Emmenlauer. Given the lack of previous complaints, I'm not excited about pushing this into stable branches, but it seems OK to squeeze it into v14. Discussion: https://postgr.es/m/48bafc63-c30f-3962-2ded-f2e985d93e86@emmenlauer.de |
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README.git |
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/.