1 files changed, 10 insertions, 3 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 14bd62a15..7f870ac8b 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -192,9 +192,16 @@ int wait4pid(int pid)
 {
         int status;
 
-        if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
-        if (WIFEXITED(status)) return WEXITSTATUS(status);
-        if (WIFSIGNALED(status)) return WTERMSIG(status);
+        if (pid <= 0) {
+                errno = ECHILD;
+                return -1;
+        }
+        if (waitpid(pid, &status, 0) == -1)
+                return -1;
+        if (WIFEXITED(status))
+                return WEXITSTATUS(status);
+        if (WIFSIGNALED(status))
+                return WTERMSIG(status) + 10000;
         return 0;
 }