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| Date: | Tue, 22 Jan 2019 09:57:20 +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 |
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| References: | <0f030e809f063f5a5e64ff7a7a0c3227 AT xs4all DOT nl> <20190106201950 DOT GC4430 AT calimero DOT vinschen DOT de> <d6431739e2801a80d73e7cb68b4fcc19 AT smtp-cloud8 DOT xs4all DOT net> |
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--=_e8233a59e192b3622c9d8208f8731238 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On 2019-01-22 09:50, Houder wrote: > On Sun, 6 Jan 2019 21:19:50, Corinna Vinschen wrote: >> >> On Dec 16 17:31, Houder wrote: >> > L.S., >> > >> > /dev/fd/N not synonymous with file descriptor N; it is on Linux >> > >> > 64-@@ cat /dev/fd/0 <<\EOF >> > > Hi >> > > EOF >> > cat: /dev/fd/0: No such file or directory >> > >> > fails on Cygwin; not on Linux. >> > >> > Also see: >> > >> > https://cygwin.com/ml/cygwin/2018-12/msg00028.html >> > ( Bash heredoc on FD 3 ) >> > >> > Based on the output of strace on Linux, I composed an STC, that duplicates >> > the steps taken by bash (and cat). >> >> This should work in the latest developer snapshot uploaded to >> https://cygwin.com/snapshots/ Please give it a try. >> >> Thanks, >> Corinna > > Nice! > > This solves: <program> -i /dev/fd/N N<<EOF (i.e. Steven Penny's > problem) > > Howver ... > (and I sure that I am not telling you anything new) > > it still not the same as Linux ... > > 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-@@ ===== --=_e8233a59e192b3622c9d8208f8731238 Content-Transfer-Encoding: base64 Content-Type: text/x-c; name=stca.c Content-Disposition: attachment; filename=stca.c; size=6104 Ly8gZ2NjIC1XYWxsIC1vIHN0Y2Egc3RjYS5jCgojaW5jbHVkZSA8c3RkaW8u aD4KI2luY2x1ZGUgPHN0ZGxpYi5oPgojaW5jbHVkZSA8dW5pc3RkLmg+CiNp bmNsdWRlIDxzdHJpbmcuaD4gLy8gc3RyZXJyb3IoKQojaW5jbHVkZSA8ZXJy bm8uaD4KI2luY2x1ZGUgPGZjbnRsLmg+CiNpbmNsdWRlIDxzeXMvc3RhdC5o PiAvLyBsc3RhdCgpCiNpbmNsdWRlIDx0aW1lLmg+CgovKgogQSBmaWxlIHRo YXQgaGFzIGJlZW4gZGVsZXRlZCwgYnV0IGlzIHN0aWxsICJoZWxkIG9wZW4i IGJ5IGFuIGVudHJ5IGluIHRoZSBvcGVuIGZpbGUgdGFibGUKIChpLmUuIHRo ZSBmaWxlIGlzIHJlZmVycmVkIGJ5IGFuIG9wZW4gZmlsZSBkZXNjcmlwdG9y 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