diff options
| -rw-r--r-- | io/Makefile | 1 | ||||
| -rw-r--r-- | io/tst-fchmod-errors.c | 56 |
2 files changed, 57 insertions, 0 deletions
diff --git a/io/Makefile b/io/Makefile index 19932d50f7..47666a1deb 100644 --- a/io/Makefile +++ b/io/Makefile @@ -188,6 +188,7 @@ tests := \ tst-closefrom \ tst-copy_file_range \ tst-faccessat \ + tst-fchmod-errors \ tst-fchmodat \ tst-fchownat \ tst-fcntl \ diff --git a/io/tst-fchmod-errors.c b/io/tst-fchmod-errors.c new file mode 100644 index 0000000000..ee15300fc3 --- /dev/null +++ b/io/tst-fchmod-errors.c @@ -0,0 +1,56 @@ +/* Test various fchmod error cases. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <fcntl.h> +#include <support/check.h> +#include <support/xunistd.h> + +static int +do_test (void) +{ + { + /* Permissions on /dev/null (the opened descriptor) cannot be changed. */ + int fd = xopen ("/dev/null", O_RDWR, 0); + errno = 0; + TEST_COMPARE (fchmod (fd, 0), -1); + TEST_COMPARE (errno, EPERM); + xclose (fd); + + /* Now testing an invalid file descriptor. */ + errno = 0; + TEST_COMPARE (fchmod (fd, 0600), -1); + TEST_COMPARE (errno, EBADF); + } + + errno = 0; + TEST_COMPARE (fchmod (-1, 0600), -1); + TEST_COMPARE (errno, EBADF); + + errno = 0; + TEST_COMPARE (fchmod (AT_FDCWD, 0600), -1); + TEST_COMPARE (errno, EBADF); + + /* Linux supports fchmod on pretty much all file descriptors, so + there is no check for failure on specific types of descriptors + here. */ + + return 0; +} + +#include <support/test-driver.c> |