138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/* Test of opening a file descriptor.
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Copyright (C) 2007-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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/* Tell GCC not to warn about the specific edge cases tested here. */
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#if _GL_GNUC_PREREQ (13, 0)
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# pragma GCC diagnostic ignored "-Wanalyzer-fd-leak"
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#endif
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/* Make test_open always inline if we're using Fortify, which defines
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__always_inline to do that. Do nothing otherwise. This works
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around a glibc bug whereby 'open' cannot be used as a function
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pointer when _FORTIFY_SOURCE is positive. */
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#if __GLIBC__ && defined __always_inline
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# define ALWAYS_INLINE __always_inline
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#else
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# define ALWAYS_INLINE
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#endif
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/* This file is designed to test both open(n,buf[,mode]) and
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openat(AT_FDCWD,n,buf[,mode]). FUNC is the function to test.
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Assumes that BASE and ASSERT are already defined, and that
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appropriate headers are already included. If PRINT, warn before
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skipping symlink tests with status 77. */
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static ALWAYS_INLINE int
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test_open (int (*func) (char const *, int, ...), bool print)
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{
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int fd;
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/* Remove anything from prior partial run. */
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unlink (BASE "file");
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unlink (BASE "e.exe");
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unlink (BASE "link");
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/* Cannot create directory. */
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errno = 0;
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ASSERT (func ("nonexist.ent/", O_CREAT | O_RDONLY, 0600) == -1);
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ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
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|| errno == EINVAL);
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/* Create a regular file. */
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fd = func (BASE "file", O_CREAT | O_RDONLY, 0600);
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ASSERT (0 <= fd);
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ASSERT (close (fd) == 0);
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/* Create an executable regular file. */
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fd = func (BASE "e.exe", O_CREAT | O_RDONLY, 0700);
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ASSERT (0 <= fd);
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ASSERT (close (fd) == 0);
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/* Trailing slash handling. */
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errno = 0;
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ASSERT (func (BASE "file/", O_RDONLY) == -1);
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ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
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/* Directories cannot be opened for writing. */
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errno = 0;
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ASSERT (func (".", O_WRONLY) == -1);
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ASSERT (errno == EISDIR || errno == EACCES);
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/* /dev/null must exist, and be writable. */
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fd = func ("/dev/null", O_RDONLY);
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ASSERT (0 <= fd);
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{
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char c;
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ASSERT (read (fd, &c, 1) == 0);
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}
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ASSERT (close (fd) == 0);
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fd = func ("/dev/null", O_WRONLY);
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ASSERT (0 <= fd);
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ASSERT (write (fd, "c", 1) == 1);
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ASSERT (close (fd) == 0);
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/* Although O_NONBLOCK on regular files can be ignored, it must not
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cause a failure. */
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fd = func (BASE "file", O_NONBLOCK | O_RDONLY);
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ASSERT (0 <= fd);
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ASSERT (close (fd) == 0);
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/* O_CLOEXEC must be honoured. */
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if (O_CLOEXEC)
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{
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/* Since the O_CLOEXEC handling goes through a special code path at its
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first invocation, test it twice. */
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int i;
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for (i = 0; i < 2; i++)
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{
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int flags;
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fd = func (BASE "file", O_CLOEXEC | O_RDONLY);
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ASSERT (0 <= fd);
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flags = fcntl (fd, F_GETFD);
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ASSERT (flags >= 0);
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ASSERT ((flags & FD_CLOEXEC) != 0);
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ASSERT (close (fd) == 0);
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}
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}
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/* Symlink handling, where supported. */
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if (symlink (BASE "file", BASE "link") != 0)
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{
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ASSERT (unlink (BASE "file") == 0);
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if (print)
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fputs ("skipping test: symlinks not supported on this file system\n",
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stderr);
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return 77;
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}
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errno = 0;
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ASSERT (func (BASE "link/", O_RDONLY) == -1);
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ASSERT (errno == ENOTDIR);
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fd = func (BASE "link", O_RDONLY);
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ASSERT (0 <= fd);
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ASSERT (close (fd) == 0);
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/* Cleanup. */
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ASSERT (unlink (BASE "file") == 0);
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ASSERT (unlink (BASE "e.exe") == 0);
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ASSERT (unlink (BASE "link") == 0);
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return 0;
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}
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