Suppress -Wunused-result warnings about write() and fwrite().

This is merely an exercise in satisfying pedants, not a bug fix, because
in every case we were checking for failure later with ferror(), or else
there was nothing useful to be done about a failure anyway.  Document
the latter cases.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/bin/psql/common.c b/src/bin/psql/common.c
index 101544800d2..5ab736e30b0 100644
--- a/src/bin/psql/common.c
+++ b/src/bin/psql/common.c
@@ -228,6 +228,7 @@ static void
 handle_sigint(SIGNAL_ARGS)
 {
 	int			save_errno = errno;
+	int			rc;
 	char		errbuf[256];
 
 	/* if we are waiting for input, longjmp out of it */
@@ -244,11 +245,16 @@ handle_sigint(SIGNAL_ARGS)
 	if (cancelConn != NULL)
 	{
 		if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
-			write_stderr("Cancel request sent\n");
+		{
+			rc = write_stderr("Cancel request sent\n");
+			(void) rc;			/* ignore errors, nothing we can do here */
+		}
 		else
 		{
-			write_stderr("Could not send cancel request: ");
-			write_stderr(errbuf);
+			rc = write_stderr("Could not send cancel request: ");
+			(void) rc;			/* ignore errors, nothing we can do here */
+			rc = write_stderr(errbuf);
+			(void) rc;			/* ignore errors, nothing we can do here */
 		}
 	}