"Richard B. Johnson" <[email protected]> writes:
> Does anybody know for sure if global 'errno' is supposed to
> be altered after a successful system call? I'm trying to
> track down a problem where system calls return with EINTR
> even though all signal handlers are set with SA_RESTART in
> the flags. It appears as though there may be a race somewhere
> because if I directly set errno to 0x1234, within a few
> hundred system calls, it gets set to EINTR even though all
> system calls seemed to return 'good'. This makes it
> hard to trace down the real problem.
>
> The answer is not obvious because the 'C' runtime library
> doesn't really give access to 'errno' instead it is dereferenced
> off some pointer returned from a function called __errno_location().
The kernel knows nothing about errno. Have you tried using strace to
check the actual return values of the system calls?
> This problem does not exist with Linux-2.4.x. It started to show
> up when user's updated their machines to newer RH stuff that uses
> linux-2.6.5-1.358.
So go file a bug with redhat. It wouldn't be the first time they ship
broken stuff.
--
Måns Rullgård
[email protected]
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]