win32: fix waitpid implementation

_cwait requires a process handle, not a pid.

1 files changed, 11 insertions, 2 deletions

diff --git a/win32/process.c b/win32/process.c
index 462731a2d..dc9e98305 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -3,9 +3,18 @@
 
 int waitpid(pid_t pid, int *status, unsigned options)
 {
+        HANDLE proc;
+        int ret;
+
         /* Windows does not understand parent-child */
-        if (options == 0 && pid != -1)
-                return _cwait(status, pid, 0);
+        if (options == 0 && pid != -1) {
+                if ( (proc=OpenProcess(SYNCHRONIZE|PROCESS_QUERY_INFORMATION,
+                                                FALSE, pid)) != NULL ) {
+                        ret = _cwait(status, proc, 0);
+                        CloseHandle(proc);
+                        return ret;
+                }
+        }
         errno = EINVAL;
         return -1;
 }