3 files changed, 12 insertions, 1 deletions

diff --git a/include/mingw.h b/include/mingw.h
index e59e6322c..70b679674 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -218,7 +218,7 @@ int setitimer(int type, struct itimerval *in, struct itimerval *out);
  * sys/wait.h
  */
 #define WNOHANG 1
-NOIMPL(waitpid,pid_t pid UNUSED_PARAM, int *status UNUSED_PARAM, unsigned options UNUSED_PARAM);
+int waitpid(pid_t pid, int *status, unsigned options);
 
 /*
  * time.h
diff --git a/win32/Kbuild b/win32/Kbuild
index 85f5ca7c4..22f8252d0 100644
--- a/win32/Kbuild
+++ b/win32/Kbuild
@@ -6,3 +6,4 @@ lib-y:=
 
 lib-$(CONFIG_PLATFORM_MINGW32) += fnmatch.o
 lib-$(CONFIG_PLATFORM_MINGW32) += mingw.o
+lib-$(CONFIG_PLATFORM_MINGW32) += process.o
diff --git a/win32/process.c b/win32/process.c
new file mode 100644
index 000000000..77d19fb9a
--- /dev/null
+++ b/win32/process.c
@@ -0,0 +1,10 @@
+#include "libbb.h"
+
+int waitpid(pid_t pid, int *status, unsigned options)
+{
+        /* Windows does not understand parent-child */
+        if (options == 0 && pid != -1)
+                return _cwait(status, pid, 0);
+        errno = EINVAL;
+        return -1;
+}