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RE: 1.5.19-4 exec family of functions find wrong file to execute
- From: Igor Peshansky <pechtcha at cs dot nyu dot edu>
- To: Martin <linkscrazy at yahoo dot com>
- Cc: cygwin at cygwin dot com
- Date: Tue, 31 Jan 2006 12:57:46 -0500 (EST)
- Subject: RE: 1.5.19-4 exec family of functions find wrong file to execute
- References: <20060131162307.61202.qmail@web30614.mail.mud.yahoo.com>
- Reply-to: cygwin at cygwin dot com
Ugh, top-posting... Reformatted.
On Tue, 31 Jan 2006, Martin wrote:
> --- Igor Peshansky <pechtcha@XX.XXX.XXX> wrote:
<http://cygwin.com/acronyms/#PCYMTNQREAIYR>. Thanks.
> > On Tue, 31 Jan 2006, Dave Korn wrote:
> >
> > > On 30 January 2006 19:23, Martin wrote:
> > >
> > > > Any response?
> > > > TIA
> > > > --- Martin <linkscrazy@yahoo.!> wrote:
> > > >
> > > >> I am attempting to invoke a command with execvp/execlp. If a
> > > >> file appears in my PATH before the executable desired and has the
> > > >> same name as the executable, the first occurrence of the file
> > > >> name is used as the executable to invoke. Even though the first
> > > >> file is NOT marked as executable.
> > >
> > > >> Is this normal behavior for execlp/execvp?
> > > >> Shouldn't the execution permission be set in order to execute it?
> > >
> > > Depends on your mountpoints. If the file is found under a
> > > mountpoint with the cygexec flag set, it will be assumed to be
> > > executable regardless of the x bit in the file's perms.
> >
> > Also, on FAT filesystems, there are no permission bits[*]... Your
> > file may be tripping the executable file detection heuristics, though.
> > Igor
> > [*] Cygwin can simulate them for you on pure FAT with "ntea", but with
> > FAT32 you're SOL.
>
> In response to your comments:
> I ran the testcase from ~/testcases directory. I believe my cygwin.out
> file indicates /home is mounted from D:\home (HOME=/home/test). Also,
> D: is NTFS. Also, there is nothing special about mount point (no -x
> flag was used). This is all shown in cygwin.out.
Then you'll just have to run this under strace, and see why it selects
that file to execute.
Igor
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