[glibc] hurd: Fix __writev_nocancel_nostatus

[glibc] hurd: Fix __writev_nocancel_nostatus

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c1dcc541131bb090ddc792139545ffcd2511a1dc

commit c1dcc541131bb090ddc792139545ffcd2511a1dc
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun Jun 14 17:44:57 2020 +0000

    hurd: Fix __writev_nocancel_nostatus
    
    * sysdeps/mach/hurd/Makefile [subdir=misc] (sysdep_routines): Add
    writev_nocancel writev_nocancel_nostatus.
    * sysdeps/mach/hurd/not-cancel.h (__writev_nocancel_nostatus): Replace
    macro with function declaration (with hidden prototype in libc).
    (__writev_nocancel): New function declaration (with hidden prototype in libc).
    * sysdeps/mach/hurd/writev_nocancel_nostatus.c: New file.
    * sysdeps/posix/writev_nocancel.c: New file, includes writev.c to make a
    nocancel variant that calls __write_nocancel.
    * sysdeps/posix/writev.c (writev): Do not define alias if __writev is
    renamed.

Diff:
---
 sysdeps/mach/hurd/Makefile                   |  4 ++++
 sysdeps/mach/hurd/not-cancel.h               | 10 ++++++++--
 sysdeps/mach/hurd/writev_nocancel_nostatus.c | 28 ++++++++++++++++++++++++++++
 sysdeps/posix/writev.c                       |  2 ++
 sysdeps/posix/writev_nocancel.c              |  4 ++++
 5 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/sysdeps/mach/hurd/Makefile b/sysdeps/mach/hurd/Makefile
index 8b74d3f002..daa69c0dae 100644
--- a/sysdeps/mach/hurd/Makefile
+++ b/sysdeps/mach/hurd/Makefile
@@ -200,6 +200,10 @@ sysdep_routines += f_setlk close_nocancel_nostatus read_nocancel \
 		   pread64_nocancel write_nocancel pwrite64_nocancel
 endif
 
+ifeq (misc, $(subdir))
+sysdep_routines += writev_nocancel writev_nocancel_nostatus
+endif
+
 ifeq ($(subdir),sunrpc)
 sysdep_headers += nfs/nfs.h
 endif
diff --git a/sysdeps/mach/hurd/not-cancel.h b/sysdeps/mach/hurd/not-cancel.h
index d2c3e20019..202dca8792 100644
--- a/sysdeps/mach/hurd/not-cancel.h
+++ b/sysdeps/mach/hurd/not-cancel.h
@@ -54,8 +54,12 @@ __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)
+/* Non cancellable writev syscall.  */
+__typeof (__writev) __writev_nocancel;
+
+/* Non cancellable writev syscall with no status.  */
+void __writev_nocancel_nostatus (int fd, const struct iovec *vector, int count);
+
 # define __waitpid_nocancel(pid, stat_loc, options) \
   __waitpid (pid, stat_loc, options)
 #define __fcntl64_nocancel(fd, cmd, ...) \
@@ -66,6 +70,8 @@ hidden_proto (__read_nocancel)
 hidden_proto (__pread64_nocancel)
 hidden_proto (__write_nocancel)
 hidden_proto (__pwrite64_nocancel)
+hidden_proto (__writev_nocancel)
+hidden_proto (__writev_nocancel_nostatus)
 hidden_proto (__close_nocancel_nostatus)
 #endif
 
diff --git a/sysdeps/mach/hurd/writev_nocancel_nostatus.c b/sysdeps/mach/hurd/writev_nocancel_nostatus.c
new file mode 100644
index 0000000000..6db24d1b53
--- /dev/null
+++ b/sysdeps/mach/hurd/writev_nocancel_nostatus.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <not-cancel.h>
+
+void
+__writev_nocancel_nostatus (int fd, const struct iovec *vector, int count)
+{
+  int save = errno;
+  __writev_nocancel (fd, vector, count);
+  __set_errno (save);
+}
+libc_hidden_weak (__writev_nocancel_nostatus)
diff --git a/sysdeps/posix/writev.c b/sysdeps/posix/writev.c
index a9942e4b99..1a45779a9a 100644
--- a/sysdeps/posix/writev.c
+++ b/sysdeps/posix/writev.c
@@ -89,4 +89,6 @@ __writev (int fd, const struct iovec *vector, int count)
   return bytes_written;
 }
 libc_hidden_def (__writev)
+#ifndef __writev
 weak_alias (__writev, writev)
+#endif
diff --git a/sysdeps/posix/writev_nocancel.c b/sysdeps/posix/writev_nocancel.c
new file mode 100644
index 0000000000..5379e9e491
--- /dev/null
+++ b/sysdeps/posix/writev_nocancel.c
@@ -0,0 +1,4 @@
+#include <not-cancel.h>
+#define __writev __writev_nocancel
+#define __write __write_nocancel
+#include <sysdeps/posix/writev.c>