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-rw-r--r--tests/test-select-stdin.c83
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diff --git a/tests/test-select-stdin.c b/tests/test-select-stdin.c
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+/* Test of select() substitute, reading from stdin.
+ Copyright (C) 2008-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+ printf ("Applying select() from standard input. Press Ctrl-C to abort.\n");
+ for (;;)
+ {
+ struct timeval before;
+ struct timeval after;
+ unsigned long spent_usec;
+ fd_set readfds;
+ struct timeval timeout;
+ int ret;
+
+ gettimeofday (&before, NULL);
+
+ FD_ZERO (&readfds);
+ FD_SET (0, &readfds);
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 500000;
+ ret = select (1, &readfds, NULL, NULL, &timeout);
+
+ gettimeofday (&after, NULL);
+ spent_usec = (after.tv_sec - before.tv_sec) * 1000000
+ + after.tv_usec - before.tv_usec;
+
+ if (ret < 0)
+ {
+ perror ("select failed");
+ exit (1);
+ }
+ if ((ret == 0) != ! FD_ISSET (0, &readfds))
+ {
+ fprintf (stderr, "incorrect return value\n");
+ exit (1);
+ }
+ if (ret == 0)
+ {
+ if (spent_usec < 250000)
+ {
+ fprintf (stderr, "returned too early\n");
+ exit (1);
+ }
+ /* Timeout */
+ printf (".");
+ ASSERT (fflush (stdout) == 0);
+ }
+ else
+ {
+ char c;
+
+ printf ("Input available! Trying to read 1 byte...\n");
+ ASSERT (read (0, &c, 1) == 1);
+ }
+ }
+}