dfork: set errno properly in some error conditions

1 files changed, 3 insertions, 1 deletions

diff --git a/libdaemon/dfork.c b/libdaemon/dfork.c
index 5fe8b7b..70fce86 100644
--- a/libdaemon/dfork.c
+++ b/libdaemon/dfork.c
@@ -328,7 +328,9 @@ pid_t daemon_fork(void) {
         if (atomic_read(pipe_fds[0], &dpid, sizeof(dpid)) != sizeof(dpid)) {
             daemon_log(LOG_ERR, "Failed to read daemon PID.");
             dpid = (pid_t) -1;
-        }
+            errno = EINVAL;
+        } else if (dpid == (pid_t) -1)
+            errno = EIO;
 
         saved_errno = errno;
         close(pipe_fds[0]);