[PATCH i-g-t 1/2] runner/executor: Check for error at writing dmesg dump

[Kamil Konieczny <kamil.konieczny@linux.intel.com>]

In processing kernel dmesg there are checks for error at reading
so add also one for writing.

Signed-off-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
---
 runner/executor.c | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/runner/executor.c b/runner/executor.c
index ac73e1dde..3939f92f1 100644
--- a/runner/executor.c
+++ b/runner/executor.c
@@ -600,7 +600,7 @@ static long dump_dmesg(int kmsgfd, int outfd)
 	bool underflow_once = false;
 	char cont;
 	char buf[2048];
-	ssize_t r;
+	ssize_t r, w;
 	long written = 0;
 
 	if (kmsgfd < 0)
@@ -654,9 +654,32 @@ static long dump_dmesg(int kmsgfd, int outfd)
 			return written;
 		}
 
-		write(outfd, buf, r);
-		written += r;
+		w = write(outfd, buf, r);
+		if (w < r) {
+			if (w == -1 && errno == EINTR)
+				w = write(outfd, buf, r);
+
+			if (w < r && w >= 0)
+				w += write(outfd, buf + w, r - w);
+
+			if (w < r) {
+				long err = -errno;
+
+				if (err) {
+					errf("Write error while processing dmesg, errno=%d\n", errno);
+				} else {
+					errf("Cannot write dmesg chunk: %ld < %ld\n", w, r);
+					err = -1;
+				}
 
+				if (comparefd >= 0)
+					close(comparefd);
+
+				return err;
+			}
+		}
+
+		written += r;
 		if (comparefd < 0 && sscanf(buf, "%u,%llu,%llu,%c;",
 					    &flags, &seq, &usec, &cont) == 4) {
 			/*
-- 
2.47.0