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On Fri, Jun 17, 2016 at 01:12:00PM +0000, Andrey wrote:
[...]
> well, although it may be not convincing to you:
> in Tcl it's return from -
> 'open $fname w'
> from man open(3tcl):
> 'w Open the file for writing only. Truncate it if it exists. If it
> does not exist, create a new file.'
You don't need to convince me :) -- I just noted that I didn't remember seeing
any evidence (which could well have been blindness on my side).
[...]
But writing a minimal Tcl program and running it through strace might shake
out whether they do any fcntl behind the scenes...
> how it could be when I tried to save a file from Emacs and got 'Resource
> temporarily unavailable'
>
> well, I included all open(2) errors in your test:
>
> int nerr[]={EACCES,EEXIST,EFAULT,EFBIG,EINTR,EINVAL,EISDIR,ELOOP,
> EMFILE,ENAMETOOLONG,ENODEV,ENOENT,ENOMEM,ENOSPC,ENOTDIR,ENXIO,
> EOPNOTSUPP,EOVERFLOW,EPERM,EROFS,ETXTBSY,EWOULDBLOCK};
I see. So still EWOULDBLOCK is the likely "culprit".
I see three things you might try:
- sift through the kernel sources watching out for a possible
EWOULDBLOCK return on open()
- have a look at the Emacs sources
- use the LD_PRELOAD trick [1] to install a little spy on open()
and let the system running for a while like this (the last one
depends on the ratio of how critical your system is and how
corageous you are ;-)
regards
[1]
https://rafalcieslak.wordpress.com/2013/04/02/dynamic-linker-tricks-using-ld_preload-to-cheat-inject-features-and-investigate-programs/
- -- tomás
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