// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Red Hat, Inc.
*
* Basic tests for open(2) and make sure open(2) works and handles error
* conditions correctly.
*
* There are 28 test cases:
* 1. Open regular file O_RDONLY
* 2. Open regular file O_WRONLY
* 3. Open regular file O_RDWR
* 4. Open regular file O_RDWR | O_SYNC
* 5. Open regular file O_RDWR | O_TRUNC
* 6. Open dir O_RDONLY
* 7. Open dir O_RDWR, expect EISDIR
* 8. Open regular file O_DIRECTORY, expect ENOTDIR
* 9. Open hard link file O_RDONLY
* 10. Open hard link file O_WRONLY
* 11. Open hard link file O_RDWR
* 12. Open sym link file O_RDONLY
* 13. Open sym link file O_WRONLY
* 14. Open sym link file O_RDWR
* 15. Open sym link dir O_RDONLY
* 16. Open sym link dir O_WRONLY, expect EISDIR
* 17. Open sym link dir O_RDWR, expect EISDIR
* 18. Open device special file O_RDONLY
* 19. Open device special file O_WRONLY
* 20. Open device special file O_RDWR
* 21. Open non-existing regular file in existing dir
* 22. Open link file O_RDONLY | O_CREAT
* 23. Open symlink file O_RDONLY | O_CREAT
* 24. Open regular file O_RDONLY | O_CREAT
* 25. Open symlink dir O_RDONLY | O_CREAT, expect EISDIR
* 26. Open dir O_RDONLY | O_CREAT, expect EISDIR
* 27. Open regular file O_RDONLY | O_TRUNC, behaviour is undefined but should
* not oops or hang
* 28. Open regular file(non-empty) O_RDONLY | O_TRUNC, behaviour is undefined
* but should not oops or hang
*/
#define _GNU_SOURCE
#include <errno.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "tst_test.h"
#define MNTPOINT "mntpoint"
#define T_REG "t_reg" /* regular file with content */
#define T_REG_EMPTY "t_reg_empty" /* empty regular file */
#define T_LINK_REG "t_link_reg" /* hard link to T_REG */
#define T_NEW_REG "t_new_reg" /* new regular file to be created */
#define T_SYMLINK_REG "t_symlink_reg" /* symlink to T_REG */
#define T_DIR "t_dir" /* test dir */
#define T_SYMLINK_DIR "t_symlink_dir" /* symlink to T_DIR */
#define T_DEV MNTPOINT"/t_dev" /* test device special file */
#define T_MSG "this is a test string"
static struct test_case {
char *desc;
char *path;
int flags;
mode_t mode;
int err;
} tc[] = {
/* Test open(2) regular file */
{ /* open regular file O_RDONLY */
.desc = "Open regular file O_RDONLY",
.path = T_REG_EMPTY,
.flags = O_RDONLY,
.mode = 0644,
.err = 0,
},
{ /* open regular file O_WRONLY */
.desc = "Open regular file O_WRONLY",
.path = T_REG_EMPTY,
.flags = O_WRONLY,
.mode = 0644,
.err = 0,
},
{ /* open regular file O_RDWR */
.desc = "Open regular file O_RDWR",
.path = T_REG_EMPTY,
.flags = O_RDWR,
.mode = 0644,
.err = 0,
},
{ /* open regular file O_RDWR | O_SYNC*/
.desc = "Open regular file O_RDWR | O_SYNC",
.path = T_REG_EMPTY,
.flags = O_RDWR | O_SYNC,
.mode = 0644,
.err = 0,
},
{ /* open regular file O_RDWR | O_TRUNC */
.desc = "Open regular file O_RDWR | O_TRUNC",
.path = T_REG_EMPTY,
.flags = O_RDWR | O_TRUNC,
.mode = 0644,
.err = 0,
},
/* Test open(2) directory */
{ /* open dir O_RDONLY */
.desc = "Open dir O_RDONLY",
.path = T_DIR,
.flags = O_RDONLY,
.mode = 0755,
.err = 0,
},
{ /* open dir O_RDWR */
.desc = "Open dir O_RDWR, expect EISDIR",
.path = T_DIR,
.flags = O_RDWR,
.mode = 0755,
.err = EISDIR,
},
{ /* open regular file O_DIRECTORY */
.desc = "Open regular file O_DIRECTORY, expect ENOTDIR",
.path = T_REG_EMPTY,
.flags = O_RDONLY | O_DIRECTORY,
.mode = 0644,
.err = ENOTDIR,
},
/* Test open(2) hard link */
{ /* open hard link file O_RDONLY */
.desc = "Open hard link file O_RDONLY",
.path = T_LINK_REG,
.flags = O_RDONLY,
.mode = 0644,
.err = 0,
},
{ /* open hard link file O_WRONLY */
.desc = "Open hard link file O_WRONLY",
.path = T_LINK_REG,
.flags = O_WRONLY,
.mode = 0644,
.err = 0,
},
{ /* open hard link file O_RDWR */
.desc = "Open hard link file O_RDWR",
.path = T_LINK_REG,
.flags = O_RDWR,
.mode = 0644,
.err = 0,
},
/* Test open(2) sym link */
{ /* open sym link file O_RDONLY */
.desc = "Open sym link file O_RDONLY",
.path = T_SYMLINK_REG,
.flags = O_RDONLY,
.mode = 0644,
.err = 0,
},
{ /* open sym link file O_WRONLY */
.desc = "Open sym link file O_WRONLY",
.path = T_SYMLINK_REG,
.flags = O_WRONLY,
.mode = 0644,
.err = 0,
},
{ /* open sym link file O_RDWR */
.desc = "Open sym link file O_RDWR",
.path = T_SYMLINK_REG,
.flags = O_RDWR,
.mode = 0644,
.err = 0,
},
{ /* open sym link dir O_RDONLY */
.desc = "Open sym link dir O_RDONLY",
.path = T_SYMLINK_DIR,
.flags = O_RDONLY,
.mode = 0644,
.err = 0,
},
{ /* open sym link dir O_WRONLY */
.desc = "Open sym link dir O_WRONLY, expect EISDIR",
.path = T_SYMLINK_DIR,
.flags = O_WRONLY,
.mode = 0644,
.err = EISDIR,
},
{ /* open sym link dir O_RDWR */
.desc = "Open sym link dir O_RDWR, expect EISDIR",
.path = T_SYMLINK_DIR,
.flags = O_RDWR,
.mode = 0644,
.err = EISDIR,
},
/* * Test open(2) device special */
{ /* open device special file O_RDONLY */
.desc = "Open device special file O_RDONLY",
.path = T_DEV,
.flags = O_RDONLY,
.mode = 0644,
.err = 0,
},
{ /* open device special file O_WRONLY */
.desc = "Open device special file O_WRONLY",
.path = T_DEV,
.flags = O_WRONLY,
.mode = 0644,
.err = 0,
},
{ /* open device special file O_RDWR */
.desc = "Open device special file O_RDWR",
.path = T_DEV,
.flags = O_RDWR,
.mode = 0644,
.err = 0,
},
/* * Test open(2) non-existing file */
{ /* open non-existing regular file in existing dir */
.desc = "Open non-existing regular file in existing dir",
.path = T_DIR"/"T_NEW_REG,
.flags = O_RDWR | O_CREAT,
.mode = 0644,
.err = 0,
},
/* test open(2) with O_CREAT */
{ /* open hard link file O_RDONLY | O_CREAT */
.desc = "Open link file O_RDONLY | O_CREAT",
.path = T_LINK_REG,
.flags = O_RDONLY | O_CREAT,
.mode = 0644,
.err = 0,
},
{ /* open sym link file O_RDONLY | O_CREAT */
.desc = "Open symlink file O_RDONLY | O_CREAT",
.path = T_SYMLINK_REG,
.flags = O_RDONLY | O_CREAT,
.mode = 0644,
.err = 0,
},
{ /* open regular file O_RDONLY | O_CREAT */
.desc = "Open regular file O_RDONLY | O_CREAT",
.path = T_REG_EMPTY,
.flags = O_RDONLY | O_CREAT,
.mode = 0644,
.err = 0,
},
{ /* open symlink dir O_RDONLY | O_CREAT */
.desc = "Open symlink dir O_RDONLY | O_CREAT, expect EISDIR",
.path = T_SYMLINK_DIR,
.flags = O_RDONLY | O_CREAT,
.mode = 0644,
.err = EISDIR,
},
{ /* open dir O_RDONLY | O_CREAT */
.desc = "Open dir O_RDONLY | O_CREAT, expect EISDIR",
.path = T_DIR,
.flags = O_RDONLY | O_CREAT,
.mode = 0644,
.err = EISDIR,
},
/* Other random open(2) tests */
{ /* open regular file O_RDONLY | O_TRUNC */
.desc = "Open regular file O_RDONLY | O_TRUNC, "
"behaviour is undefined but should not oops or hang",
.path = T_REG_EMPTY,
.flags = O_RDONLY | O_TRUNC,
.mode = 0644,
.err = -1,
},
{ /* open regular(non-empty) file O_RDONLY | O_TRUNC */
.desc = "Open regular file(non-empty) O_RDONLY | O_TRUNC, "
"behaviour is undefined but should not oops or hang",
.path = T_REG,
.flags = O_RDONLY | O_TRUNC,
.mode = 0644,
.err = -1,
},
};
static void verify_open(unsigned int n)
{
int fd;
TEST(open(tc[n].path, tc[n].flags, tc[n].mode));
fd = TST_RET;
if (fd > 0)
SAFE_CLOSE(fd);
if (tc[n].err == -1 || TST_ERR == tc[n].err) {
tst_res(TPASS, "%s", tc[n].desc);
return;
}
tst_res(TFAIL | TTERRNO, "%s - expected %s",
tc[n].desc, tst_strerrno(tc[n].err));
}
static void setup(void)
{
int fd;
int ret;
fd = SAFE_OPEN(T_REG, O_WRONLY | O_CREAT, 0644);
ret = write(fd, T_MSG, sizeof(T_MSG));
if (ret == -1) {
SAFE_CLOSE(fd);
tst_brk(TBROK | TERRNO, "Write %s failed", T_REG);
}
SAFE_CLOSE(fd);
SAFE_TOUCH(T_REG_EMPTY, 0644, NULL);
SAFE_LINK(T_REG, T_LINK_REG);
SAFE_SYMLINK(T_REG, T_SYMLINK_REG);
SAFE_MKDIR(T_DIR, 0755);
SAFE_SYMLINK(T_DIR, T_SYMLINK_DIR);
SAFE_MKNOD(T_DEV, S_IFCHR, makedev(1, 5));
}
static struct tst_test test = {
.tcnt = ARRAY_SIZE(tc),
.setup = setup,
.test = verify_open,
.needs_devfs = 1,
.mntpoint = MNTPOINT,
.needs_root = 1,
};