hurd: Make read and pread64 cancellable

and add _nocancel variants.

* sysdeps/mach/hurd/pread64.c (__libc_pread64):  Call __pread64_nocancel
surrounded by enabling async cancel, to replace implementation moved to...
* sysdeps/mach/hurd/pread64_nocancel.c (__pread64_nocancel): ... here.
* sysdeps/mach/hurd/read.c (__libc_read): Call __read_nocancel surrounded by
enabling async cancel, to replace implementation moved to...
* sysdeps/mach/hurd/read_nocancel.c (__read_nocancel): ... here.
* sysdeps/mach/hurd/Makefile (sysdep_routines): Add read_nocancel and
pread64_nocancel.
* sysdeps/mach/hurd/not-cancel.h (__read_nocancel, __pread64_nocancel):
Replace macros with prototypes with a hidden proto on libc.

* sysdeps/mach/hurd/dl-sysdep.c: Include <not-cancel.h>.
(__pread64_nocancel): New alias, check that it is not hidden.
(__read_nocancel): New alias, check that it is not hidden.

* sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE): Add __read_nocancel and
__pread64_nocancel.
(ld.GLIBC_2.1): Add __pread64.
(ld.GLIBC_PRIVATE): Add __read_nocancel and __pread64_nocancel.
* sysdeps/mach/hurd/i386/ld.abilist (__pread64): Add symbol.
* sysdeps/mach/hurd/i386/localplt.data (__read_nocancel, __pread64,
__pread64_nocancel): Add references.

1 files changed, 6 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/Versions b/sysdeps/mach/hurd/Versions
index 1d6633f782..ce873f33f6 100644
--- a/sysdeps/mach/hurd/Versions
+++ b/sysdeps/mach/hurd/Versions
@@ -10,6 +10,7 @@ libc {
   GLIBC_PRIVATE {
     # Functions shared with the dynamic linker
     __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
+    __read_nocancel; __pread64_nocancel;
     __libc_lock_self0; __getcwd;
 
     _dl_init_first;
@@ -32,6 +33,10 @@ ld {
     _exit; _hurd_intr_rpc_mach_msg;
     abort;
   }
+  GLIBC_2.1 {
+    # functions that must be shared with libc
+    __pread64;
+  }
   GLIBC_2.2 {
     # functions that must be shared with libc
     __open64;
@@ -45,6 +50,7 @@ ld {
 
     # functions that must be shared with libc
     __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
+    __read_nocancel; __pread64_nocancel;
     __libc_lock_self0; __getcwd;
   }
 }