backporting posix_spawn-based popen implementation in 2.29

glibc-rh2065588-11.patch

@@ -0,0 +1,39 @@
+commit 5a5a3a3234bc220a5192d620e0cbc5360da46f14
+Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
+Date:   Tue Mar 24 15:40:36 2020 -0300
+
+    support/shell-container.c: Add builtin exit
+    
+    Reviewed-by: DJ Delorie <dj@redhat.com>
+
+diff --git a/support/shell-container.c b/support/shell-container.c
+index e9eea64bca7e949d..aeaf6d2733abce61 100644
+--- a/support/shell-container.c
++++ b/support/shell-container.c
+@@ -135,6 +135,18 @@ copy_func (char **argv)
+ 
+ }
+ 
++/* Emulate the 'exit' builtin.  The exit value is optional.  */
++static int
++exit_func (char **argv)
++{
++  int exit_val = 0;
++
++  if (argv[0] != 0)
++    exit_val = atoi (argv[0]) & 0xff;
++  exit (exit_val);
++  return 0;
++}
++
+ /* This is a list of all the built-in commands we understand.  */
+ static struct {
+   const char *name;
+@@ -143,6 +155,7 @@ static struct {
+   { "true", true_func },
+   { "echo", echo_func },
+   { "cp", copy_func },
++  { "exit", exit_func },
+   { NULL, NULL }
+ };
+