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Date: | Tue, 22 Jan 2019 10:25:53 +0100 |
From: | Houder <houder AT xs4all DOT nl> |
To: | cygwin AT cygwin DOT com |
Subject: | Re: /dev/fd/N not synonymous with file descriptor N; it is on Linux |
In-Reply-To: | <20190122090633.GK2802@calimero.vinschen.de> |
References: | <0f030e809f063f5a5e64ff7a7a0c3227 AT xs4all DOT nl> <20190106201950 DOT GC4430 AT calimero DOT vinschen DOT de> <d6431739e2801a80d73e7cb68b4fcc19 AT smtp-cloud8 DOT xs4all DOT net> <1c60402837d6510667357257b5e96e88 AT xs4all DOT nl> <20190122090633 DOT GK2802 AT calimero DOT vinschen DOT de> |
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On 2019-01-22 10:06, Corinna Vinschen wrote: > On Jan 22 09:57, Houder wrote: >> On 2019-01-22 09:50, Houder wrote: >> > On Sun, 6 Jan 2019 21:19:50, Corinna Vinschen wrote: >> > > This should work in the latest developer snapshot uploaded to >> > > https://cygwin.com/snapshots/ Please give it a try. >> > So, for the record only: >> >> and as another example, this STC succeeds on Linux ..., but fails on >> Cygwin. >> >> 64-@@ ./stca /dev/fd/0 <<EOF >> > bla >> > EOF >> fd1 = 0 >> argv[1] = /dev/fd/0 >> fd2 = 3 >> id = writefd2, errno = 13, errstr = Permission denied >> 64-@@ > > Not sure what you're testing. This is the result for me on both, > Windows 8.1 and Windows 10 1809: Curious! It fails (for me) on W7 ... > Not sure what you're testing. STC inherits a "read-only" open file descriptor from bash. On Linux the file can be opened read-write (via procfs), because a new entry is created in the open file table. (opening the file read-write (via fdescfs) on FreeBSD would fail) For this reason the output does not show what has been entered via the here-doc. In short, I was merely testing the semantics of Linux. > )$ ./stca /dev/fd/0 <<EOF > ? bla > ? EOF > fd1 = 0 > argv[1] = /dev/fd/0 > fd2 = 3 > buf = \ > Hello, world! > > > Corinna -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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