hurd: make open and openat cancellation points

and add _nocancel variants.

* sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add open_nocancel
openat_nocancel.
* sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE, ld.GLIBC_PRIVATE): Add
__open_nocancel.
* sysdeps/mach/hurd/dl-sysdep.c (__open_nocancel): Add alias, check it
is not hidden.
* sysdeps/mach/hurd/i386/localplt.data (__open_nocancel): Allow PLT.
* sysdeps/mach/hurd/not-cancel.h (__open_nocancel, __openat_nocancel:
Replace macros with declarations with hidden proto.
(__open64_nocancel, __openat64_nocancel): Call __open_nocancel and
__openat_nocancel instead of __open64 and __openat64.
* sysdeps/mach/hurd/open.c: Include <sysdep-cancel.h>
(__libc_open): Surround __file_name_lookup with enabling async cancel.
* sysdeps/mach/hurd/openat.c: Likewise.
* sysdeps/mach/hurd/open_nocancel.c,
sysdeps/mach/hurd/openat_nocancel.c: New files.

1 files changed, 14 insertions, 8 deletions

diff --git a/sysdeps/mach/hurd/not-cancel.h b/sysdeps/mach/hurd/not-cancel.h
index 202dca8792..c627ec7bde 100644
--- a/sysdeps/mach/hurd/not-cancel.h
+++ b/sysdeps/mach/hurd/not-cancel.h
@@ -29,19 +29,23 @@
 #include <hurd/fd.h>
 
 /* For now we have none.  Map the name to the normal functions.  */
-#define __open_nocancel(...) \
-  __open (__VA_ARGS__)
-#define __open64_nocancel(...) \
-  __open64 (__VA_ARGS__)
-#define __openat_nocancel(...) \
-  __openat (__VA_ARGS__)
-#define __openat64_nocancel(...) \
-  __openat64 (__VA_ARGS__)
 #define __close_nocancel(fd) \
   __close (fd)
 
 void __close_nocancel_nostatus (int fd);
 
+/* Non cancellable open syscall.  */
+__typeof (__open) __open_nocancel;
+/* open64 is just the same as open for us.  */
+#define __open64_nocancel(...) \
+  __open_nocancel (__VA_ARGS__)
+
+/* Non cancellable openat syscall.  */
+__typeof (__openat) __openat_nocancel;
+/* open64 is just the same as open for us.  */
+#define __openat64_nocancel(...) \
+  __openat_nocancel (__VA_ARGS__)
+
 /* Non cancellable read syscall.  */
 __typeof (__read) __read_nocancel;
 
@@ -66,6 +70,8 @@ void __writev_nocancel_nostatus (int fd, const struct iovec *vector, int count);
   __fcntl64 (fd, cmd, __VA_ARGS__)
 
 #if IS_IN (libc)
+hidden_proto (__open_nocancel)
+hidden_proto (__openat_nocancel)
 hidden_proto (__read_nocancel)
 hidden_proto (__pread64_nocancel)
 hidden_proto (__write_nocancel)