Ok, you have convinced me, as long as the man page and the LTP get fixed. /Carsten "Maciej W. Rozycki" wrote: > On Tue, 25 Jun 2002, Carsten Langgaard wrote: > > > > Linux platforms do it this way, e.g. Alpha and IA-64. A SIGSEGV is a > > > valid response for an invalid address. Remember you test pipe(3) and not > > > pipe(2). > > > > I'm not sure that you mean by pipe(2) and pipe(3), but according to my man > > page, pipe should return with EFAULT in this case. > > pipe(2) is a syscall, while pipe(3) is a library call (see `man 2 intro' > and `man 3 intro', respectively). You rarely access syscalls directly -- > the system library usually does this for you. Depending on a system > certain library functions may be trivial syscall wrappers, invoke a number > of syscalls (see e.g. the stat() family) or be implemented entirely in the > userland. > > > ERRORS > > EMFILE Too many file descriptors are in use by the pro > > cess. > > ENFILE The system file table is full. > > EFAULT filedes is not valid. > > Yep, this denotes such an error is possible and under what conditions. I > don't think it actually mandates it, at least it's not expressed > explicitly. Anyway, it's valid for i386 and possibly nothing else. Look > at the system version it refers to -- my version is: "Linux 0.99.11 23 > July 1993". > > A brief search of the web for "EFAULT pipe" reveals confirms others agree > with me -- the error is not mandatory (the EFAULT vs SIGSEGV issue was > discussed a few times at least in various contexts -- go search the web). > > I believe a SIGSEGV is saner, too -- this way it's harder for an error > resulting from passing an invalid pointer to remain unnoticed (consider > some code that passes a pointer to read-only memory and fails to check a > result of pipe()). > > If still in doubt, you may try to discuss the LTP result at > <linux-kernel@vger.kernel.org>. I don't think anybody wants to rewrite > pipe(2) for all the platforms that handle it our way. > > Maciej > > -- > + Maciej W. Rozycki, Technical University of Gdansk, Poland + > +--------------------------------------------------------------+ > + e-mail: macro@ds2.pg.gda.pl, PGP key available + -- _ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com |\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527 | \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555 TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556 Denmark http://www.mips.com
