[PATCH] argv[0] of execvp when ENOEXEC
Rich Felker
dalias at aerifal.cx
Wed Aug 21 17:52:26 UTC 2013
On Wed, Aug 21, 2013 at 12:36:00PM -0500, Rob Landley wrote:
> On 08/21/2013 09:16:29 AM, Wei-cheng Wang wrote:
> >On Wed, Aug 21, 2013 at 6:12 PM, Denys Vlasenko
> ><vda.linux at googlemail.com> wrote:
> >> On Tue, Aug 20, 2013 at 6:42 PM, Wei-cheng Wang
> ><cole945 at gmail.com> wrote:
> >> You mean, this happens if foo.sh is a non-executable file
> > Yes. foo.sh a shell script with execute permission without #! at
> >the very first line.
> > For example,
> > $ echo "echo hello" > ./foo.sh
> > $ chmod a+x ./foo.sh
> > $ ./foo.sh
> > hello
> >> and /bin/sh is a symlink to busybox?
> > Yes. busybox, toybox, toolbox (android) and similar tools use
> >this way to
> > provides multiple Unix tools with a single executable binary.
>
> gzip/gunzip detecting whether to force the -d flag predates them all
> by a decade, and I'm told the bell labs guys were already doing it
> in the 70's in Programmer's Workbench...
This analogy is not relevant because gzip/gunzip are not part of POSIX
and the specification of execvp does not require invoking them in a
way that breaks with the multicall binary idiom.
Rich
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