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From: Vadim Godunko <vadik@rc.rost.ru>
Subject: Re: Checking file permissions
Date: 2000/03/11
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References: <slrn8chc9b.2ba.randhol@kiuk0156.chembio.ntnu.no>
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Preben Randhol wrote:

> Is it possible to check if a file is read and/or writable before trying
> to open it? I have found a check that checks if a file is a regular
> file (in GNAT), but I cannot find in the RM any function that (I understood) can
> be used to check if a file is readable.
>
> System:   Linux 2.2.x
> Compiler: Gnat 3.12p
> Language: Ada95
>
> Any hints much appreciated.
>
> --
> Preben Randhol -- [randhol@pvv.org] -- [http://www.pvv.org/~randhol/]
>          "Det eneste trygge stedet i verden er inne i en fortelling."
>                                                       -- Athol Fugard

For check file attributes (read, write, executable) you may use Ada-POSIX bindings,

for example Florist (ftp://ftp.cs.nyu.edu/pub/gnat/florist).