Issue #9842 has been updated by Akira Tanaka.

Status changed from Open to Closed
% Done changed from 0 to 100

Applied in changeset r45984.

----------
* ext/etc/etc.c: Etc.sysconf, Etc.confstr and IO#pathconf implemented.

* ext/etc/extconf.rb: Check sysconf(), confstr() and fpathconf().

* ext/etc/mkconstants.rb: New file.

 [ruby-core:62600] [Feature #9842]

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Feature #9842: system configuration variables (sysconf(), confstr(), pathconf() and fpathconf())
https://bugs.ruby-lang.org/issues/9842#change-46790

* Author: Akira Tanaka
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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How about providing methods to obtain system configuration variables?

POSIX defines sysconf(), confstr(), pathconf() and fpathconf().
I implemented following methods in ext/etc.

* Etc.sysconf(name)
* Etc.confstr(name)
* IO.pathconf(name)
* IO#pathconf(name)

POSIX defines some names.
Various operating sysmtems define additional names.

They can be used as follows:

```
Etc.sysconf(Etc::SC_ARG_MAX) #=> 2097152
Etc.sysconf(Etc::SC_NPROCESSORS_ONLN) #=> 4
Etc.confstr(Etc::CS_PATH) #=> "/bin:/usr/bin"
Etc.confstr(Etc::CS_GNU_LIBC_VERSION) #=> "glibc 2.18"
IO.pathconf("/", Etc::PC_NAME_MAX) #=> 255
open("/") {|f| p f.pathconf(Etc::PC_TIMESTAMP_RESOLUTION) } #=> 1
```

I implemented them in ext/etc because I interpreted "etc" as
system configuration.

Any idea?


---Files--------------------------------
sysconf-confstr-pathconf.patch (13 KB)
sysconf-confstr-fpathconf.patch (12.1 KB)


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