Fix <https://issues.guix.gnu.org/61095>, which affects GNU/Hurd.

diff --git a/libguile/posix.c b/libguile/posix.c
index 3a8be94e4..f5fdc544c 100644
--- a/libguile/posix.c
+++ b/libguile/posix.c
@@ -1326,7 +1326,14 @@ static void
 close_inherited_fds_slow (posix_spawn_file_actions_t *actions, int max_fd)
 {
   while (--max_fd > 2)
-    posix_spawn_file_actions_addclose (actions, max_fd);
+    {
+      /* Adding invalid file descriptors to an 'addclose' action leads
+         to 'posix_spawn' failures on some operating systems:
+         <https://bugs.gnu.org/61095>.  Hence the extra check.  */
+      int flags = fcntl (max_fd, F_GETFD, NULL);
+      if ((flags >= 0) && ((flags & FD_CLOEXEC) == 0))
+        posix_spawn_file_actions_addclose (actions, max_fd);
+    }
 }
 
 static void

Fix <https://issues.guix.gnu.org/62501>.

diff --git a/test-suite/tests/posix.test b/test-suite/tests/posix.test
index f20e04453..d5cf47cda 100644
--- a/test-suite/tests/posix.test
+++ b/test-suite/tests/posix.test
@@ -431,7 +431,13 @@
       (let ((str (get-string-all (car input+output))))
         (close-port (car input+output))
         (waitpid pid)
-        str)))
+
+        ;; On GNU/Hurd, the exec server prepends 'LD_ORIGIN_PATH' for
+        ;; every program: <https://bugs.gnu.org/62501>.  Strip it.
+        (if (and (string=? "GNU" (utsname:sysname (uname)))
+                 (string-prefix? "LD_ORIGIN_PATH=" str))
+            (string-drop str (+ 1 (string-index str #\newline)))
+            str))))
 
   (pass-if-equal "ls /proc/self/fd"
       "0\n1\n2\n3\n"                     ;fourth FD is for /proc/self/fd
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<div class='path'>path: <a href='/guix/log/?id=e4259d4e9e3251e4c4b45d1cce4008ac32b504c8'>root</a>/<a href='/guix/log/tests?id=e4259d4e9e3251e4c4b45d1cce4008ac32b504c8'>tests</a>/<a href='/guix/log/tests/glob.scm?id=e4259d4e9e3251e4c4b45d1cce4008ac32b504c8'>glob.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/glob.scm?id=e4259d4e9e3251e4c4b45d1cce4008ac32b504c8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-09 22:25:17 +0100'>2020-12-09</span></td><td><a href='/guix/commit/tests/glob.scm?id=371ba7b4be81895d202519824bf19893bfdb2526'>guix: Add globstar support.</a><span class='msg-avail'>...</span></td><td>Giacomo Leidi</td></tr>