[PATCH xorg-gtest 6/7] process: if the wait fails because the child is still running, reset errno

[Peter Hutterer]

Prevent callers from getting odd errors if they notice the wait fails
because the child is still running and errno is still on whatever it was
before.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/process.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/process.cpp b/src/process.cpp
index af8b0f8..9580569 100644
--- a/src/process.cpp
+++ b/src/process.cpp
@@ -176,8 +176,12 @@ bool xorg::testing::Process::WaitForExit(unsigned int timeout) {
       d_->state = FINISHED_FAILURE;
     }
     return true;
-  } else
+  } else {
+    /* prevent callers from getting odd erros if they check for errno */
+    if (pid == 0)
+      errno = 0;
     return (pid == -1 && errno == ECHILD);
+  }
 }
 
 bool xorg::testing::Process::KillSelf(int signal, unsigned int timeout) {
-- 
1.8.0.2