Comments on: flock before execve? http://dpk.net/2009/03/13/flock-before-execve/ oh you want the time travel spinning head? Tue, 22 May 2012 01:51:50 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: allen http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-162603 allen Sat, 25 Feb 2012 00:24:08 +0000 http://dpk.net/?p=488#comment-162603 Are you running this in Windows (under cygwin or similar)? Windows have much more restrictions on what cannot be done in parallel, in particular, under some situations, directories and files that are 'in use' cannot be written to by other processes Are you running this in Windows (under cygwin or similar)?

Windows have much more restrictions on what cannot be done in parallel, in particular, under some situations, directories and files that are ‘in use’ cannot be written to by other processes

]]> By: bad interpreter: Text file busy - Admins Goodies http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-107712 bad interpreter: Text file busy - Admins Goodies Wed, 24 Aug 2011 12:15:30 +0000 http://dpk.net/?p=488#comment-107712 [...] appear to be having this issue, which is because at some point nvi started opening files O_RDWR instead of [...] [...] appear to be having this issue, which is because at some point nvi started opening files O_RDWR instead of [...]

]]> By: jason http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-38535 jason Thu, 29 Oct 2009 19:19:42 +0000 http://dpk.net/?p=488#comment-38535 I'm getting the "text file busy" when trying to mv or rm a .htm file: server:/Scanned/OAO # rm ApplicationArchive.htm rm: remove regular file `ApplicationArchive.htm'? y rm: cannot remove `ApplicationArchive.htm': Text file busy why would this happen to a pure text file and not an executable. I’m getting the “text file busy” when trying to mv or rm a .htm file:
server:/Scanned/OAO # rm ApplicationArchive.htm
rm: remove regular file `ApplicationArchive.htm’? y
rm: cannot remove `ApplicationArchive.htm’: Text file busy

why would this happen to a pure text file and not an executable.

]]> By: dpk http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-29015 dpk Sat, 14 Mar 2009 14:32:06 +0000 http://dpk.net/?p=488#comment-29015 Could be. I've checked sysctl -a for lock, exec, etc. "bash shellscript -foo" works fine. FWIW, the same thing happens with csh, further pointing at the kernel. Edited: I think I've figured out what is going on (assuming the code I am looking at is the code that is in use). In fs/exec.c, do_exec() calls open_exec(), which calls deny_write_access(). That checks to see how many processes have the file open for writing, and if it is more than 0, it returns Text file busy. It's really old behavior, but I haven't seen it until now because previous versions of nvi would open the input file with O_RDONLY, and the new version opens it O_RDWR (confirmed with strace). You can duplicate the issue by running "cat >> shellscript" from the command line and them attempting to run the script in another window. The behavior seems to make more sense now (now that I know it's not flock, that is) from a security standpoint. Could be. I’ve checked sysctl -a for lock, exec, etc. “bash shellscript -foo” works fine. FWIW, the same thing happens with csh, further pointing at the kernel.

Edited: I think I’ve figured out what is going on (assuming the code I am looking at is the code that is in use). In fs/exec.c, do_exec() calls open_exec(), which calls deny_write_access(). That checks to see how many processes have the file open for writing, and if it is more than 0, it returns Text file busy.

It’s really old behavior, but I haven’t seen it until now because previous versions of nvi would open the input file with O_RDONLY, and the new version opens it O_RDWR (confirmed with strace).

You can duplicate the issue by running “cat >> shellscript” from the command line and them attempting to run the script in another window. The behavior seems to make more sense now (now that I know it’s not flock, that is) from a security standpoint.

]]> By: rone http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-29009 rone Sat, 14 Mar 2009 07:00:32 +0000 http://dpk.net/?p=488#comment-29009 Hmm, sure it's not some security setting? Try 'bash shellscript -foo' and see if that works. I ran into this on some outsourced servers at work. Hmm, sure it’s not some security setting? Try ‘bash shellscript -foo’ and see if that works. I ran into this on some outsourced servers at work.

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