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-rw-r--r--tests/test-ftruncate.c60
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diff --git a/tests/test-ftruncate.c b/tests/test-ftruncate.c
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+/* Test truncating a file.
+ Copyright (C) 2011-2022 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/>. */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (ftruncate, int, (int, off_t));
+
+#include <errno.h>
+#include <fcntl.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+ const char *filename = argv[1];
+
+ /* Test behaviour for invalid file descriptors. */
+ {
+ errno = 0;
+ ASSERT (ftruncate (-1, 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+ {
+ close (99);
+ errno = 0;
+ ASSERT (ftruncate (99, 0) == -1);
+ ASSERT (errno == EBADF);
+ }
+
+ /* Test behaviour for read-only file descriptors. */
+ {
+ int fd = open (filename, O_RDONLY);
+ ASSERT (fd >= 0);
+ errno = 0;
+ ASSERT (ftruncate (fd, 0) == -1);
+ ASSERT (errno == EBADF || errno == EINVAL
+ || errno == EACCES /* seen on mingw */
+ );
+ close (fd);
+ }
+
+ return 0;
+}