From 1428926f1f0d7577cd2de8d019a27f8082855d03 Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Sat, 30 May 2020 15:11:49 +0200
Subject: [PATCH] syscalls: set-thread-name, thread-name: Stub for the Hurd.

Avoid crash

    Backtrace:
    guix/build/syscalls.scm:405:8: In procedure prctl: Function not implemented

because of missing prctl on the Hurd.

* guix/build/syscalls.scm (set-thread-name, thread-name): Rename to ...
(set-thread-name!/linux,thread-name/linux): ...this.
(set-thread-name, thread-name): Swtich between linux implementation and or
stub.
---
 guix/build/syscalls.scm | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index d69b178a0a..549346c5f9 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -1218,7 +1218,7 @@ handler if the lock is already held by another process."
   ;; zero.
   16)
 
-(define (set-thread-name name)
+(define (set-thread-name!/linux name)
   "Set the name of the calling thread to NAME.  NAME is truncated to 15
 bytes."
   (let ((ptr (string->pointer name)))
@@ -1231,7 +1231,7 @@ bytes."
                (list (strerror err))
                (list err))))))
 
-(define (thread-name)
+(define (thread-name/linux)
   "Return the name of the calling thread as a string."
   (let ((buf (make-bytevector %max-thread-name-length)))
     (let-values (((ret err)
@@ -1245,6 +1245,16 @@ bytes."
                  (list (strerror err))
                  (list err))))))
 
+(define set-thread-name
+  (if (string-contains %host-type "linux")
+      set-thread-name!/linux
+      (cute const #f)))
+
+(define thread-name
+  (if (string-contains %host-type "linux")
+      thread-name/linux
+      (cute const "")))
+
 
 ;;;
 ;;; Network interfaces.