On 2015-01-11 at 01:22:34 +0100, Brandon Allbery wrote: [...]

The "ByteString" in the SYstem.Posix.*.ByteString modules applies to the pathnames (POSIX pathnames are byte strings, and there's lots of ways to cause problems if you insist on pretending that they are in any particular encoding), not the values being read/written, so functions like that are basically carried along just to provide a mostly compatible API.

I would expect to find functions working with ByteString values under Data.ByteString.

However those take [Char] as FilePath argument... where would you look if you wanted to functions that used ByteStrings for both, filepaths and content? Cheers, hvr

The naming collision is unfortunate, but solvable with the PackageImports extension. On 06:15, Sun, Jan 11, 2015 Antoine Latter wrote:

The 'unix-bytestring' package looks like it can read a ByteString from the file descriptor once you have it open:

http://hackage.haskell.org/package/unix-bytestring-0.3.7.2/docs/System-Posix...

Sadly both 'unix' and 'unix-bytestring' define a module named 'System.Posix.IO.ByteString', and you need functionality from both to get your job done - 'openFd' from 'unix' and then 'fdRead' from 'unix-bytestring'.

On Sun Jan 11 2015 at 7:18:30 AM Herbert Valerio Riedel wrote:

...

On 2015-01-11 at 01:22:34 +0100, Brandon Allbery wrote:

[...]

...

The "ByteString" in the SYstem.Posix.*.ByteString modules applies to the pathnames (POSIX pathnames are byte strings, and there's lots of ways to cause problems if you insist on pretending that they are in any particular encoding), not the values being read/written, so functions like that are basically carried along just to provide a mostly compatible API.

I would expect to find functions working with ByteString values under Data.ByteString.

However those take [Char] as FilePath argument... where would you look if you wanted to functions that used ByteStrings for both, filepaths and content?

Cheers, hvr _______________________________________________ Libraries mailing list Libraries@haskell.org http://www.haskell.org/mailman/listinfo/libraries

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Antoine Latter wrote:

The 'unix-bytestring' package looks like it can read a ByteString from the file descriptor once you have it open:

http://hackage.haskell.org/package/unix-bytestring-0.3.7.2/docs/System-Posix...

Sadly both 'unix' and 'unix-bytestring' define a module named 'System.Posix.IO.ByteString', and you need functionality from both to get your job done - 'openFd' from 'unix' and then 'fdRead' from 'unix-bytestring'.

Ah, thanks for that. In the end, I ended up using `fdReadBuf` to read the data into a buffer, followed by `unsafePackCStringFinalizer` to get a ByteString. Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/