[hurd,commited] hurd: Add support for spawn_do_closefrom

[Samuel Thibault]

---
 sysdeps/mach/hurd/spawn_int_def.h | 24 ++++++++++++++++++++++++
 sysdeps/mach/hurd/spawni.c        | 15 ++++++++++++++-
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 sysdeps/mach/hurd/spawn_int_def.h

diff --git a/sysdeps/mach/hurd/spawn_int_def.h 
b/sysdeps/mach/hurd/spawn_int_def.h
new file mode 100644
index 0000000000..d04a416986
--- /dev/null
+++ b/sysdeps/mach/hurd/spawn_int_def.h
@@ -0,0 +1,24 @@
+/* Internal definitions for posix_spawn functionality.  Hurd version.
+   Copyright (C) 2021 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/>.  */
+
+#ifndef _SPAWN_INT_DEF_H
+#define _SPAWN_INT_DEF_H
+
+#define __SPAWN_SUPPORT_CLOSEFROM 1
+
+#endif /* _SPAWN_INT_H */
diff --git a/sysdeps/mach/hurd/spawni.c b/sysdeps/mach/hurd/spawni.c
index e011c3b34b..060e389bbb 100644
--- a/sysdeps/mach/hurd/spawni.c
+++ b/sysdeps/mach/hurd/spawni.c
@@ -505,6 +505,19 @@ retry:
            return EBADF;
          }
 
+       /* Close file descriptors in the child.  */
+       error_t do_closefrom (int lowfd)
+         {
+           while ((unsigned int) lowfd < dtablesize)
+             {
+               error_t err = do_close (lowfd);
+               if (err != 0 && err != EBADF)
+                 return err;
+               lowfd++;
+             }
+           return 0;
+         }
+
        /* Make sure the dtable can hold NEWFD.  */
 #define EXPAND_DTABLE(newfd)                                                 \
        ({                                                                    \
@@ -615,7 +628,7 @@ retry:
            break;
 
          case spawn_do_closefrom:
-           err = EINVAL;
+           err = do_closefrom (action->action.closefrom_action.from);
            break;
          }
 
-- 
2.30.2