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, 2 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/Versions b/sysdeps/mach/hurd/Versions
index e8b4aba776..67594d8c08 100644
--- a/sysdeps/mach/hurd/Versions
+++ b/sysdeps/mach/hurd/Versions
@@ -13,6 +13,7 @@ libc {
   GLIBC_PRIVATE {
     # Functions shared with the dynamic linker
     __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
+    __open_nocancel;
     __read_nocancel; __pread64_nocancel;
     __write_nocancel;
     __libc_lock_self0; __getcwd;
@@ -54,6 +55,7 @@ ld {
 
     # functions that must be shared with libc
     __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
+    __open_nocancel;
     __read_nocancel; __pread64_nocancel;
     __write_nocancel;
     __libc_lock_self0; __getcwd;