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-rw-r--r--src/grep/gnulib-tests/test-select-fd.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/src/grep/gnulib-tests/test-select-fd.c b/src/grep/gnulib-tests/test-select-fd.c
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+++ b/src/grep/gnulib-tests/test-select-fd.c
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+/* Test of select() substitute, reading or writing from a given file descriptor.
+ Copyright (C) 2008-2021 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>
+
+int
+main (int argc, char *argv[])
+{
+ if (argc == 4)
+ {
+ char mode = argv[1][0];
+
+ if (mode == 'r' || mode == 'w')
+ {
+ int fd = atoi (argv[2]);
+
+ if (fd >= 0)
+ {
+ const char *result_file_name = argv[3];
+ FILE *result_file = fopen (result_file_name, "wb");
+
+ if (result_file != NULL)
+ {
+ fd_set fds;
+ struct timeval timeout;
+ int ret;
+
+ FD_ZERO (&fds);
+ FD_SET (fd, &fds);
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 10000;
+ ret = (mode == 'r'
+ ? select (fd + 1, &fds, NULL, NULL, &timeout)
+ : select (fd + 1, NULL, &fds, NULL, &timeout));
+ if (ret < 0)
+ {
+ perror ("select failed");
+ exit (1);
+ }
+ if ((ret == 0) != ! FD_ISSET (fd, &fds))
+ {
+ fprintf (stderr, "incorrect return value\n");
+ exit (1);
+ }
+ fprintf (result_file, "%d\n", ret);
+ exit (0);
+ }
+ }
+ }
+ }
+ fprintf (stderr, "Usage: test-select-fd mode fd result-file-name\n");
+ exit (1);
+}