libmount: (test) check writing to a file was successful

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/libmount/src/lock.c b/libmount/src/lock.c
index e73edf54b471163265f77229af9793d38e2d6410..f381e423e400e7753fd8445296061814164f237d 100644 (file)
--- a/libmount/src/lock.c
+++ b/libmount/src/lock.c
@@ -21,6 +21,7 @@
 #include <limits.h>
 #include <sys/file.h>
 
+#include "closestream.h"
 #include "pathnames.h"
 #include "mountP.h"
 
@@ -573,7 +574,9 @@ void increment_data(const char *filename, int verbose, int loopno)
                err(EXIT_FAILURE, "%d: failed to open: %s", getpid(), filename);
 
        fprintf(f, "%ld", num);
-       fclose(f);
+
+       if (close_stream(f) != 0)
+               err(EXIT_FAILURE, "write failed: %s", filename);
 
        if (verbose)
                fprintf(stderr, "%d: %s: %ld --> %ld (loop=%d)\n", getpid(),