Call find_exec with the FE_NNF flag to enforce a NULL return when the
executable isn't found in $PATH.  Convert NULL to "".  This aligns
spawnvp and spawnvpe with execvp and execvpe.
---
 winsup/cygwin/release/3.1.0 | 3 +++
 winsup/cygwin/spawn.cc      | 9 ++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/release/3.1.0 b/winsup/cygwin/release/3.1.0
index 3f2f3c86b..fb0e37215 100644
--- a/winsup/cygwin/release/3.1.0
+++ b/winsup/cygwin/release/3.1.0
@@ -91,3 +91,6 @@ Bug Fixes
 - If the argument to mkdir(2) or rmdir(2) is 'x:\', don't strip the
   trailing backslash.
   Addresses: https://cygwin.com/ml/cygwin/2019-08/msg00334.html
+
+- Make spawnvp, spawnvpe fail if the executable is not in $PATH.
+  Addresses: https://cygwin.com/ml/cygwin/2019-10/msg00032.html
diff --git a/winsup/cygwin/spawn.cc b/winsup/cygwin/spawn.cc
index f8090a6a4..f82860e72 100644
--- a/winsup/cygwin/spawn.cc
+++ b/winsup/cygwin/spawn.cc
@@ -1081,8 +1081,9 @@ extern "C" int
 spawnvp (int mode, const char *file, const char * const *argv)
 {
   path_conv buf;
-  return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf), argv,
-                 cur_environ ());
+  return spawnve (mode | _P_PATH_TYPE_EXEC,
+                 find_exec (file, buf, "PATH", FE_NNF) ?: "",
+                 argv, cur_environ ());
 }
 
 extern "C" int
@@ -1090,7 +1091,9 @@ spawnvpe (int mode, const char *file, const char * const 
*argv,
          const char * const *envp)
 {
   path_conv buf;
-  return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf), argv, envp);
+  return spawnve (mode | _P_PATH_TYPE_EXEC,
+                 find_exec (file, buf, "PATH", FE_NNF) ?: "",
+                 argv, envp);
 }
 
 int
-- 
2.21.0

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