core: use write() to send handoff timestamp

Before 12001b1bf067339db089d52e08fd0b4c6a9945df, the timestamp is sent
with write(), but the commit made the timestamp sent by send(), and
causes regressin #33299.

Note the invocation will still fail if write() is filtered by seccomp.
But, that is an old issue since Type=exec is introduced
(5686391b006ee82d8a4559067ad9818e3e631247).

Partially fixes a regression caused by 12001b1bf067339db089d52e08fd0b4c6a9945df.
Partially fixes #33299.

diff --git a/src/core/exec-invoke.c b/src/core/exec-invoke.c
index ec5684d1a573bd784b19d61ded57d9e8f37908db..78a05f873e2126584170ca1af2aecf287844eebc 100644 (file)
--- a/src/core/exec-invoke.c
+++ b/src/core/exec-invoke.c
@@ -4013,7 +4013,7 @@ static int send_handoff_timestamp(
         dual_timestamp dt;
         dual_timestamp_now(&dt);
 
-        if (send(p->handoff_timestamp_fd, (const usec_t[2]) { dt.realtime, dt.monotonic }, sizeof(usec_t) * 2, 0) < 0) {
+        if (write(p->handoff_timestamp_fd, (const usec_t[2]) { dt.realtime, dt.monotonic }, sizeof(usec_t) * 2) < 0) {
                 if (reterr_exit_status)
                         *reterr_exit_status = EXIT_EXEC;
                 return log_exec_error_errno(c, p, errno, "Failed to send handoff timestamp: %m");