43489: Add error checking on a new write() call.

Silences a compiler warning (write(2) is declared with warn_unused_result
in current Debian Unstable).

2 files changed, 8 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 0841cb325..b5c41edb5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2018-09-25  Daniel Shahaf  <d.s@daniel.shahaf.name>
+
+	* 43489: Src/exec.c: Add error checking on a new write() call.
+
 2018-09-25  Peter Stephenson  <p.w.stephenson@ntlworld.com>
 
 	* 43543: Src/jobs.c: Improvements to 43535: attempt to keep
diff --git a/Src/exec.c b/Src/exec.c
index a667b078d..1d537af24 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -2745,7 +2745,10 @@ execcmd_fork(Estate state, int how, int type, Wordcode varspc,
 	flags |= ESUB_JOB_CONTROL;
     *filelistp = jobtab[thisjob].filelist;
     entersubsh(flags, &esret);
-    write(synch[1], &esret, sizeof(esret));
+    if (write_loop(synch[1], (const void *) &esret, sizeof(esret)) != sizeof(esret)) {
+	zerr("Failed to send entersubsh_ret report: %e", errno);
+	return -1;
+    }
     close(synch[1]);
     zclose(close_if_forked);