hurd: Make write and pwrite64 cancellation points

and add _nocancel variants.

* sysdeps/mach/hurd/write.c (__libc_write): Call __write_nocancel
surrounded by enabling async cancel, to replace implementation moved
to...
* sysdeps/mach/hurd/write_nocancel.c (__write_nocancel): ... here.
* sysdeps/mach/hurd/pwrite64.c (__libc_pwrite64): Call
__pwrite64_nocancel surrounded by enabling async cancel, to replace
implementation moved to...
* sysdeps/mach/hurd/pwrite64_nocancel.c (__pwrite64_nocancel): ... here.
* sysdeps/mach/hurd/Makefile (sysdep_routines): Add write_nocancel and
pwrite64_nocancel.
* sysdeps/mach/hurd/not-cancel.h (__write_nocancel,
__pwrite64_nocancel): Replace macros with prototypes with a hidden proto on
libc.

* sysdeps/mach/hurd/dl-sysdep.c (__write_nocancel): New alias, check
that it is not hidden.
* sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE): Add __write_nocancel.
(ld.GLIBC_PRIVATE): Add __write_nocancel.
* sysdeps/mach/hurd/i386/localplt.data (__write_nocancel): Add
reference.

1 files changed, 8 insertions, 2 deletions

diff --git a/sysdeps/mach/hurd/not-cancel.h b/sysdeps/mach/hurd/not-cancel.h
index 8a8f5a9d3c..d2c3e20019 100644
--- a/sysdeps/mach/hurd/not-cancel.h
+++ b/sysdeps/mach/hurd/not-cancel.h
@@ -48,8 +48,12 @@ __typeof (__read) __read_nocancel;
 /* Non cancellable pread syscall (LFS version).  */
 __typeof (__pread64) __pread64_nocancel;
 
-#define __write_nocancel(fd, buf, n) \
-  __write (fd, buf, n)
+/* Non cancellable write syscall.  */
+__typeof (__write) __write_nocancel;
+
+/* Non cancellable pwrite syscall (LFS version).  */
+__typeof (__pwrite64) __pwrite64_nocancel;
+
 #define __writev_nocancel_nostatus(fd, iov, n) \
   (void) __writev (fd, iov, n)
 # define __waitpid_nocancel(pid, stat_loc, options) \
@@ -60,6 +64,8 @@ __typeof (__pread64) __pread64_nocancel;
 #if IS_IN (libc)
 hidden_proto (__read_nocancel)
 hidden_proto (__pread64_nocancel)
+hidden_proto (__write_nocancel)
+hidden_proto (__pwrite64_nocancel)
 hidden_proto (__close_nocancel_nostatus)
 #endif