Add pthread_getname_np and pthread_setname_np for Hurd

We use thread_get_name and thread_set_name to get and set the thread
name, so nothing is stored in the thread structure since these functions
are supposed to be called sparingly.

One notable difference with Linux is that the thread name is up to 32
chars, whereas Linux's is 16.

Also added a mach_RPC_CHECK to check for the existing of gnumach RPCs.

6 files changed, 215 insertions, 13 deletions

diff --git a/sysdeps/mach/configure b/sysdeps/mach/configure
index 5779efd1ef..cd21b26df4 100644
--- a/sysdeps/mach/configure
+++ b/sysdeps/mach/configure
@@ -293,6 +293,9 @@ if test "x$mach_interface_list" = x; then
   as_fn_error $? "what manner of Mach is this?" "$LINENO" 5
 fi
 
+
+
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for egrep -e" >&5
 printf %s "checking for egrep -e... " >&6; }
 if test ${ac_cv_path_EGREP_TRADITIONAL+y}
@@ -429,7 +432,7 @@ printf "%s\n" "$ac_cv_path_EGREP_TRADITIONAL" >&6; }
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for host_page_size in mach_host.defs" >&5
 printf %s "checking for host_page_size in mach_host.defs... " >&6; }
-if test ${libc_cv_mach_host_page_size+y}
+if test ${libc_cv_mach_rpc_host_page_size+y}
 then :
   printf %s "(cached) " >&6
 else case e in #(
@@ -441,22 +444,83 @@ _ACEOF
 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
   $EGREP_TRADITIONAL "host_page_size" >/dev/null 2>&1
 then :
-  libc_cv_mach_host_page_size=yes
+  libc_cv_mach_rpc_host_page_size=yes
 else case e in #(
-  e) libc_cv_mach_host_page_size=no ;;
+  e) libc_cv_mach_rpc_host_page_size=no ;;
 esac
 fi
 rm -rf conftest*
  ;;
 esac
 fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mach_host_page_size" >&5
-printf "%s\n" "$libc_cv_mach_host_page_size" >&6; }
-if test $libc_cv_mach_host_page_size = yes; then
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mach_rpc_host_page_size" >&5
+printf "%s\n" "$libc_cv_mach_rpc_host_page_size" >&6; }
+if test $libc_cv_mach_rpc_host_page_size = yes; then
   printf "%s\n" "#define HAVE_HOST_PAGE_SIZE 1" >>confdefs.h
 
 fi
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for thread_set_name in gnumach.defs" >&5
+printf %s "checking for thread_set_name in gnumach.defs... " >&6; }
+if test ${libc_cv_mach_rpc_thread_set_name+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <mach/gnumach.defs>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP_TRADITIONAL "thread_set_name" >/dev/null 2>&1
+then :
+  libc_cv_mach_rpc_thread_set_name=yes
+else case e in #(
+  e) libc_cv_mach_rpc_thread_set_name=no ;;
+esac
+fi
+rm -rf conftest*
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mach_rpc_thread_set_name" >&5
+printf "%s\n" "$libc_cv_mach_rpc_thread_set_name" >&6; }
+if test $libc_cv_mach_rpc_thread_set_name = yes; then
+  printf "%s\n" "#define HAVE_MACH_THREAD_SET_NAME 1" >>confdefs.h
+
+fi
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for thread_get_name in gnumach.defs" >&5
+printf %s "checking for thread_get_name in gnumach.defs... " >&6; }
+if test ${libc_cv_mach_rpc_thread_get_name+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <mach/gnumach.defs>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP_TRADITIONAL "thread_get_name" >/dev/null 2>&1
+then :
+  libc_cv_mach_rpc_thread_get_name=yes
+else case e in #(
+  e) libc_cv_mach_rpc_thread_get_name=no ;;
+esac
+fi
+rm -rf conftest*
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mach_rpc_thread_get_name" >&5
+printf "%s\n" "$libc_cv_mach_rpc_thread_get_name" >&6; }
+if test $libc_cv_mach_rpc_thread_get_name = yes; then
+  printf "%s\n" "#define HAVE_MACH_THREAD_GET_NAME 1" >>confdefs.h
+
+fi
+
+
 ac_fn_c_check_header_preproc "$LINENO" "mach/machine/ndr_def.h" "ac_cv_header_mach_machine_ndr_def_h"
 if test "x$ac_cv_header_mach_machine_ndr_def_h" = xyes
 then :
diff --git a/sysdeps/mach/configure.ac b/sysdeps/mach/configure.ac
index 730fb25d50..648035e832 100644
--- a/sysdeps/mach/configure.ac
+++ b/sysdeps/mach/configure.ac
@@ -72,14 +72,29 @@ if test "x$mach_interface_list" = x; then
   AC_MSG_ERROR([what manner of Mach is this?])
 fi
 
-AC_CACHE_CHECK(for host_page_size in mach_host.defs,
-	       libc_cv_mach_host_page_size, [dnl
-AC_EGREP_HEADER(host_page_size, mach/mach_host.defs,
-		libc_cv_mach_host_page_size=yes,
-		libc_cv_mach_host_page_size=no)])
-if test $libc_cv_mach_host_page_size = yes; then
-  AC_DEFINE([HAVE_HOST_PAGE_SIZE])
+dnl
+dnl mach_RPC_CHECK(interface.defs, rpc_method, define)
+dnl
+dnl Check if rpc_method RPC is defined by interface.defs
+dnl and define `define`.
+dnl
+AC_DEFUN([mach_RPC_CHECK], [dnl
+AC_CACHE_CHECK(for $2 in $1, libc_cv_mach_rpc_$2, [dnl
+AC_EGREP_HEADER($2, mach/$1,
+		libc_cv_mach_rpc_$2=yes,
+		libc_cv_mach_rpc_$2=no)])
+if test $libc_cv_mach_rpc_$2 = yes; then
+  AC_DEFINE([$3])
 fi
+])
+
+
+mach_RPC_CHECK(mach_host.defs, host_page_size,
+	       HAVE_HOST_PAGE_SIZE)
+mach_RPC_CHECK(gnumach.defs, thread_set_name,
+	       HAVE_MACH_THREAD_SET_NAME)
+mach_RPC_CHECK(gnumach.defs, thread_get_name,
+	       HAVE_MACH_THREAD_GET_NAME)
 
 AC_CHECK_HEADER(mach/machine/ndr_def.h, [dnl
   DEFINES="$DEFINES -DNDR_DEF_HEADER='<mach/machine/ndr_def.h>'"], [dnl
diff --git a/sysdeps/mach/htl/pt-getname-np.c b/sysdeps/mach/htl/pt-getname-np.c
new file mode 100644
index 0000000000..8943474b3d
--- /dev/null
+++ b/sysdeps/mach/htl/pt-getname-np.c
@@ -0,0 +1,67 @@
+/* pthread_getname_np.
+   Copyright (C) 2024 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 <hurd.h>
+#include <mach_debug/mach_debug_types.h>
+#include <pthread.h>
+#include <pthreadP.h>
+#include <string.h>
+
+#include <pt-internal.h>
+
+int
+__pthread_getname_np (pthread_t thread, char *buf, size_t len)
+{
+#ifdef HAVE_MACH_THREAD_GET_NAME
+/* GNU Mach doesn't export this so we have to define it ourselves.  */
+#define MACH_THREAD_NAME_MAX 32
+  struct __pthread *pthread;
+  error_t err;
+  kernel_debug_name_t tmp;
+
+  /* Note that we don't check for len to be MACH_THREAD_NAME_MAX
+   * since we want to be more compatible with the Linux API which
+   * requires that the buffer is at least 16 bytes long.
+   *
+   * We check for at least 1 byte since we truncate the result below.  */
+  if (len < 1)
+    return ERANGE;
+  if (len > MACH_THREAD_NAME_MAX)
+    len = MACH_THREAD_NAME_MAX;
+
+  /* Lookup the thread structure for THREAD.  */
+  pthread = __pthread_getid (thread);
+  if (pthread == NULL)
+    return ESRCH;
+
+  /* __thread_get_name expects a buffer of size sizeof (kernel_debug_name_t)
+   * and anything smaller will overflow.  */
+  err = __thread_get_name (pthread->kernel_thread, tmp);
+  if (err != KERN_SUCCESS)
+    return __hurd_fail (err);
+  /* Truncate the source name to fit in the destination buffer.  */
+  tmp[len - 1] = '\0';
+  memcpy (buf, tmp, len);
+
+  return 0;
+#else
+  return ENOTSUP;
+#endif
+}
+
+weak_alias (__pthread_getname_np, pthread_getname_np)
diff --git a/sysdeps/mach/htl/pt-setname-np.c b/sysdeps/mach/htl/pt-setname-np.c
new file mode 100644
index 0000000000..2fd66730e9
--- /dev/null
+++ b/sysdeps/mach/htl/pt-setname-np.c
@@ -0,0 +1,52 @@
+/* pthread_setname_np.  Mach version.
+   Copyright (C) 2024 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 <hurd.h>
+#include <pthread.h>
+#include <pthreadP.h>
+#include <string.h>
+
+#include <pt-internal.h>
+
+int
+__pthread_setname_np (pthread_t thread, const char *name)
+{
+#ifdef HAVE_MACH_THREAD_SET_NAME
+/* GNU Mach doesn't export this so we have to define it ourselves.  */
+#define MACH_THREAD_NAME_MAX 32
+  struct __pthread *pthread;
+  error_t err;
+
+  /* Lookup the thread structure for THREAD.  */
+  pthread = __pthread_getid (thread);
+  if (pthread == NULL)
+    return ESRCH;
+
+  if (strlen (name) >= MACH_THREAD_NAME_MAX)
+    return ERANGE;
+
+  err = __thread_set_name (pthread->kernel_thread, name);
+  if (err != KERN_SUCCESS)
+    return __hurd_fail (err);
+  return 0;
+#else
+  return ENOTSUP;
+#endif
+}
+
+weak_alias (__pthread_setname_np, pthread_setname_np)
diff --git a/sysdeps/mach/hurd/i386/libpthread.abilist b/sysdeps/mach/hurd/i386/libpthread.abilist
index fa90cc6597..3ea7cb41fa 100644
--- a/sysdeps/mach/hurd/i386/libpthread.abilist
+++ b/sysdeps/mach/hurd/i386/libpthread.abilist
@@ -164,3 +164,5 @@ GLIBC_2.32 tss_create F
 GLIBC_2.32 tss_delete F
 GLIBC_2.32 tss_get F
 GLIBC_2.32 tss_set F
+GLIBC_2.40 pthread_getname_np F
+GLIBC_2.40 pthread_setname_np F
diff --git a/sysdeps/mach/hurd/x86_64/libpthread.abilist b/sysdeps/mach/hurd/x86_64/libpthread.abilist
index 80615d16ee..69999df5bb 100644
--- a/sysdeps/mach/hurd/x86_64/libpthread.abilist
+++ b/sysdeps/mach/hurd/x86_64/libpthread.abilist
@@ -163,3 +163,5 @@ GLIBC_2.38 tss_create F
 GLIBC_2.38 tss_delete F
 GLIBC_2.38 tss_get F
 GLIBC_2.38 tss_set F
+GLIBC_2.40 pthread_getname_np F
+GLIBC_2.40 pthread_setname_np F