diff options
Diffstat (limited to 'stdio-common/tst-put-error.c')
| -rw-r--r-- | stdio-common/tst-put-error.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/stdio-common/tst-put-error.c b/stdio-common/tst-put-error.c index 5209cce..71c1103 100644 --- a/stdio-common/tst-put-error.c +++ b/stdio-common/tst-put-error.c @@ -34,20 +34,30 @@ do_test (void) FILE *fp = fdopen (fd, "w"); if (fp == NULL) error (EXIT_FAILURE, errno, "fdopen"); + + /* All of the tests below verify that flushing buffers result in failure of + the fprintf calls. We ensure that the buffer is flushed at the end of + each fprintf call by doing two things - setting the file pointer to + line-buffered so that it is flushed whenever it encounters a newline and + then ensuring that there is a newline in each of the format strings we + pass to fprintf. */ + setlinebuf (fp); close (fd); unlink (tmpl); + int n = fprintf (fp, "hello world\n"); printf ("fprintf = %d\n", n); if (n >= 0) error (EXIT_FAILURE, 0, "first fprintf succeeded"); + n = fprintf (fp, "hello world\n"); printf ("fprintf = %d\n", n); if (n >= 0) error (EXIT_FAILURE, 0, "second fprintf succeeded"); /* Padded printing takes a different code path. */ - n = fprintf (fp, "%10000000s", "foo"); + n = fprintf (fp, "%100s\n", "foo"); printf ("fprintf = %d\n", n); if (n >= 0) error (EXIT_FAILURE, 0, "padded fprintf succeeded"); |