Date: Sat, 18 Feb 2006 13:43:30 -0800 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Divacky Roman <xdivac02@stud.fit.vutbr.cz> Cc: hackers@freebsd.org Subject: Re: different behaviour on fbsd and linux Message-ID: <20060218214329.GF69162@funkthat.com> In-Reply-To: <20060218173908.GA73913@stud.fit.vutbr.cz> References: <20060218171718.GA73133@stud.fit.vutbr.cz> <20060218172152.GB11874@britannica.bec.de> <20060218173908.GA73913@stud.fit.vutbr.cz>
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Divacky Roman wrote this message on Sat, Feb 18, 2006 at 18:39 +0100:
> On Sat, Feb 18, 2006 at 06:21:52PM +0100, joerg@britannica.bec.de wrote:
> > On Sat, Feb 18, 2006 at 06:17:18PM +0100, Divacky Roman wrote:
> > > execl("/bin/ls", NULL);
> >
> > This is wrong. You must specify arg0 != NULL (POSIX says so) and you
> > must NULL-terminate the *following* list.
> >
> > E.g.:
> > execl("/bin/ls", "/bin/ls", NULL);
> > is what you want to do.
>
>
> ah.. thnx.. the man page should be updated with "he
> first argument, by convention, should point to the file name associated
> with the file being executed."
>
> s/should/must then
Nope.. it need not be the same.. in cases like this:
execl("/usr/bin/gzip", "gunzip", NULL);
will give you gunzip behavior because the gzip binary looks at argv[0]
and changes it's behavior based upon what it finds.. look at crunchgen
for the ability to combine different programs into one binary...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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