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Message-ID: <AANLkTikRvGO_xrk85eegh_PeGrkOOkpN-rjkhJCW7n74@mail.gmail.com>
Date: Thu, 10 Mar 2011 10:46:00 -0600
From: Linas Vepstas <linasvepstas@...il.com>
To: Chris Metcalf <cmetcalf@...era.com>
Cc: Arnd Bergmann <arnd@...db.de>,
GLIBC Devel <libc-alpha@...rceware.org>,
linux-kernel@...r.kernel.org, libc-ports@...rceware.org
Subject: Re: asm-generic/unistd.h and glibc use of NR_ipc
Hi Chris,
A question, and a patch follow:
On 28 September 2010 08:05, Chris Metcalf <cmetcalf@...era.com> wrote:
> (Adding libc-ports to the cc list.)
>
> On 9/28/2010 4:40 AM, Arnd Bergmann wrote:
>> Chris Metcalf is using the generic unistd.h file on the tile architecture
>> and has a glibc port that should be easily portable to all future
>> architectures. There are a few of them getting ready to be merged
>> now (c6x, lm32, nios2, and some people have contacted me privately
>> for architectures I cannot name).
>>
>> I expect that all of them will just use the same syscall ABI and glibc
>> port.
>
> I'm happy to provide some previews of the work I'm doing to interested parties.
[...]
> sysdeps/unix/sysv/linux/generic/access.c
> sysdeps/unix/sysv/linux/generic/bits/fcntl.h
> sysdeps/unix/sysv/linux/generic/bits/sem.h
> sysdeps/unix/sysv/linux/generic/bits/stat.h
> sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> sysdeps/unix/sysv/linux/generic/chmod.c
> sysdeps/unix/sysv/linux/generic/chown.c
> sysdeps/unix/sysv/linux/generic/lxstat.c
> sysdeps/unix/sysv/linux/generic/xstat.c
> sysdeps/unix/sysv/linux/generic/Versions
> sysdeps/unix/sysv/linux/generic/fxstatat.c
> sysdeps/unix/sysv/linux/generic/lchown.c
> sysdeps/unix/sysv/linux/generic/link.c
> sysdeps/unix/sysv/linux/generic/readlink.c
> sysdeps/unix/sysv/linux/generic/open.c
> sysdeps/unix/sysv/linux/generic/open64.c
> sysdeps/unix/sysv/linux/generic/pipe.c
> sysdeps/unix/sysv/linux/generic/poll.c
> sysdeps/unix/sysv/linux/generic/recv.c
> sysdeps/unix/sysv/linux/generic/rmdir.c
> sysdeps/unix/sysv/linux/generic/send.c
> sysdeps/unix/sysv/linux/generic/symlink.c
> sysdeps/unix/sysv/linux/generic/syscalls.list
> sysdeps/unix/sysv/linux/generic/sysdep.h
> sysdeps/unix/sysv/linux/generic/unlink.c
> sysdeps/unix/sysv/linux/generic/xmknod.c
> sysdeps/unix/sysv/linux/generic/sysctl.c
> sysdeps/unix/sysv/linux/generic/readlink_chk.c
> sysdeps/unix/sysv/linux/generic/ustat.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/fcntl.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/fstatfs.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/ftruncate.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/llseek.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/lseek.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/mmap.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/posix_fadvise.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/statfs.c
> sysdeps/unix/sysv/linux/generic/wordsize-32/truncate.c
> sysdeps/unix/sysv/linux/generic/brk.c
> sysdeps/unix/sysv/linux/generic/dl-origin.c
> sysdeps/unix/sysv/linux/generic/umount.c
> sysdeps/unix/sysv/linux/generic/creat.c
> sysdeps/unix/sysv/linux/generic/pause.c
> sysdeps/unix/sysv/linux/generic/Makefile
> sysdeps/unix/sysv/linux/generic/select.c
> sysdeps/unix/sysv/linux/generic/epoll_create.c
> sysdeps/unix/sysv/linux/generic/epoll_wait.c
> sysdeps/unix/sysv/linux/generic/inotify_init.c
> sysdeps/unix/sysv/linux/generic/dup2.c
> sysdeps/unix/sysv/linux/generic/mkdir.c
> sysdeps/unix/sysv/linux/generic/rename.c
> sysdeps/unix/sysv/linux/generic/utimes.c
I note that this hasn't been merged into glibc-2.13, any particular
explaintation
for that?
Anyway, it seems that pthread cancellation pints are missing
from a couple of the functions. e.g. for send, recv, one needs
the following:
Index: glibc-2.13/sysdeps/unix/sysv/linux/generic/send.c
===================================================================
--- glibc-2.13.orig/sysdeps/unix/sysv/linux/generic/send.c 2011-03-10
10:26:48.000000000 -0600
+++ glibc-2.13/sysdeps/unix/sysv/linux/generic/send.c 2011-03-10
10:26:55.000000000 -0600
@@ -18,12 +18,25 @@
#include <stdlib.h>
#include <sys/types.h>
-#include <sysdep.h>
+#include <sysdep-cancel.h>
#include <libc-symbols.h>
ssize_t __libc_send(int sockfd, const void *buffer, size_t len, int flags)
{
- return INLINE_SYSCALL (sendto, 6, sockfd, buffer, len, flags, NULL, 0);
+ ssize_t result;
+
+ if (SINGLE_THREAD_P)
+ result = INLINE_SYSCALL (sendto, 6, sockfd, buffer, len, flags, NULL, 0);
+ else
+ {
+ int oldtype = LIBC_CANCEL_ASYNC ();
+
+ result = INLINE_SYSCALL (sendto, 6, sockfd, buffer, len, flags, NULL, 0);
+
+ LIBC_CANCEL_RESET (oldtype);
+ }
+
+ return result;
}
strong_alias (__libc_send, __send)
and likewise for recv ...
--linas
--
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