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Fixed fgets_eagain unit test.
On a non-blocking pipe fgets sets EAGAIN when it encounters partial lines. No error is set on full lines or EOF. EOF is reached when the writing end of the pipe is closed. Partial lines and full lines are both returned by fgets, EOF results in NULL. Mention of this behaviour can be found in #1903 and #2045.
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@ -2447,8 +2447,9 @@ test_util_exit_status(void *ptr)
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#endif
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#ifndef _WIN32
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/** Check that fgets waits until a full line, and not return a partial line, on
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* a EAGAIN with a non-blocking pipe */
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/* Check that fgets with a non-blocking pipe returns partial lines and sets
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* EAGAIN, returns full lines and sets no error, and returns NULL on EOF and
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* sets no error */
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static void
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test_util_fgets_eagain(void *ptr)
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{
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@ -2457,17 +2458,19 @@ test_util_fgets_eagain(void *ptr)
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ssize_t retlen;
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char *retptr;
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FILE *test_stream = NULL;
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char buf[10];
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char buf[4] = { 0 };
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(void)ptr;
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errno = 0;
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/* Set up a pipe to test on */
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retval = pipe(test_pipe);
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tt_int_op(retval, >=, 0);
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tt_int_op(retval, ==, 0);
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/* Set up the read-end to be non-blocking */
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retval = fcntl(test_pipe[0], F_SETFL, O_NONBLOCK);
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tt_int_op(retval, >=, 0);
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tt_int_op(retval, ==, 0);
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/* Open it as a stdio stream */
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test_stream = fdopen(test_pipe[0], "r");
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@ -2477,51 +2480,69 @@ test_util_fgets_eagain(void *ptr)
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retlen = write(test_pipe[1], "A", 1);
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tt_int_op(retlen, ==, 1);
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_want(retptr == NULL);
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tt_int_op(errno, ==, EAGAIN);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "A");
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errno = 0;
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/* Send in the rest */
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retlen = write(test_pipe[1], "B\n", 2);
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tt_int_op(retlen, ==, 2);
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_int_op(errno, ==, 0);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "AB\n");
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tt_str_op(buf, ==, "B\n");
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errno = 0;
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/* Send in a full line */
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retlen = write(test_pipe[1], "CD\n", 3);
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tt_int_op(retlen, ==, 3);
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_int_op(errno, ==, 0);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "CD\n");
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errno = 0;
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/* Send in a partial line */
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retlen = write(test_pipe[1], "E", 1);
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tt_int_op(retlen, ==, 1);
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_ptr_op(retptr, ==, NULL);
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tt_int_op(errno, ==, EAGAIN);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "E");
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errno = 0;
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/* Send in the rest */
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retlen = write(test_pipe[1], "F\n", 2);
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tt_int_op(retlen, ==, 2);
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_int_op(errno, ==, 0);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "EF\n");
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tt_str_op(buf, ==, "F\n");
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errno = 0;
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/* Send in a full line and close */
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retlen = write(test_pipe[1], "GH", 2);
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tt_int_op(retlen, ==, 2);
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retval = close(test_pipe[1]);
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test_pipe[1] = -1;
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tt_int_op(retval, ==, 0);
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test_pipe[1] = -1;
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_int_op(errno, ==, 0);
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tt_ptr_op(retptr, ==, buf);
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tt_str_op(buf, ==, "GH");
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errno = 0;
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/* Check for EOF */
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retptr = fgets(buf, sizeof(buf), test_stream);
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tt_int_op(errno, ==, 0);
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tt_ptr_op(retptr, ==, NULL);
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tt_int_op(feof(test_stream), >, 0);
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retval = feof(test_stream);
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tt_int_op(retval, !=, 0);
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errno = 0;
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/* Check that buf is unchanged according to C99 and C11 */
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tt_str_op(buf, ==, "GH");
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done:
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if (test_stream != NULL)
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@ -3782,7 +3803,7 @@ struct testcase_t util_tests[] = {
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#endif
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#ifndef _WIN32
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UTIL_TEST(exit_status, 0),
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UTIL_TEST(fgets_eagain, TT_SKIP),
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UTIL_TEST(fgets_eagain, 0),
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#endif
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UTIL_TEST(spawn_background_ok, 0),
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UTIL_TEST(spawn_background_fail, 0),
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