at-func.c

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/* Define at-style functions like fstatat, unlinkat, fchownat, etc.

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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 Jim Meyering */

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#include "dosname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */

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#ifdef GNULIB_SUPPORT_ONLY_AT_FDCWD

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# include <errno.h>

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# ifndef ENOTSUP

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# define ENOTSUP EINVAL

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# endif

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#else

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# include "openat.h"

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# include "openat-priv.h"

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# include "save-cwd.h"

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#endif

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#ifdef AT_FUNC_USE_F1_COND

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# define CALL_FUNC(F) \

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(flag == AT_FUNC_USE_F1_COND \

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? AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS) \

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: AT_FUNC_F2 (F AT_FUNC_POST_FILE_ARGS))

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# define VALIDATE_FLAG(F) \

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if (flag & ~AT_FUNC_USE_F1_COND) \

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{ \

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errno = EINVAL; \

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return FUNC_FAIL; \

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}

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#else

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# define CALL_FUNC(F) (AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS))

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# define VALIDATE_FLAG(F) /* empty */

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#endif

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#ifdef AT_FUNC_RESULT

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# define FUNC_RESULT AT_FUNC_RESULT

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#else

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# define FUNC_RESULT int

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#endif

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#ifdef AT_FUNC_FAIL

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# define FUNC_FAIL AT_FUNC_FAIL

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#else

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# define FUNC_FAIL -1

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#endif

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/* Call AT_FUNC_F1 to operate on FILE, which is in the directory

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open on descriptor FD. If AT_FUNC_USE_F1_COND is defined to a value,

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AT_FUNC_POST_FILE_PARAM_DECLS must include a parameter named flag;

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call AT_FUNC_F2 if FLAG is 0 or fail if FLAG contains more bits than

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AT_FUNC_USE_F1_COND. Return int and fail with -1 unless AT_FUNC_RESULT

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or AT_FUNC_FAIL are defined. If possible, do it without changing the

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working directory. Otherwise, resort to using save_cwd/fchdir,

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then AT_FUNC_F?/restore_cwd. If either the save_cwd or the restore_cwd

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fails, then give a diagnostic and exit nonzero. */

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FUNC_RESULT

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AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)

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{

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VALIDATE_FLAG (flag);

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if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))

fd == -100	Description
TRUE	never evaluated
FALSE	never evaluated

(((file)[0]) == '/')	Description
TRUE	never evaluated
FALSE	never evaluated

0 != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fd == -100	Description
TRUE	never evaluated
FALSE	never evaluated

(((file)[0]) == '/')	Description
TRUE	never evaluated
FALSE	never evaluated

0 != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fd == -100	Description
TRUE	never evaluated
FALSE	never evaluated

(((file)[0]) == '/')	Description
TRUE	never evaluated
FALSE	never evaluated

0 != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fd == -100	Description
TRUE	never evaluated
FALSE	never evaluated

(((file)[0]) == '/')	Description
TRUE	never evaluated
FALSE	never evaluated

0 != 0	Description
TRUE	never evaluated
FALSE	never evaluated

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return CALL_FUNC (file);

never executed: return (rpl_getfilecon (file , con));

never executed: return (rpl_lgetfilecon (file , con));

never executed: return (setfilecon (file , con));

never executed: return (lsetfilecon (file , con));

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#ifdef GNULIB_SUPPORT_ONLY_AT_FDCWD

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errno = ENOTSUP;

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return FUNC_FAIL;

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#else

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{

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/* Be careful to choose names unlikely to conflict with

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AT_FUNC_POST_FILE_PARAM_DECLS. */

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struct saved_cwd saved_cwd;

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int saved_errno;

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FUNC_RESULT err;

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{

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char proc_buf[OPENAT_BUFFER_SIZE];

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char *proc_file = openat_proc_name (proc_buf, fd, file);

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if (proc_file)

proc_file	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file	Description
TRUE	never evaluated
FALSE	never evaluated

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{

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FUNC_RESULT proc_result = CALL_FUNC (proc_file);

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int proc_errno = errno;

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if (proc_file != proc_buf)

proc_file != proc_buf	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file != proc_buf	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file != proc_buf	Description
TRUE	never evaluated
FALSE	never evaluated

proc_file != proc_buf	Description
TRUE	never evaluated
FALSE	never evaluated

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free (proc_file);

never executed: free (proc_file);

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/* If the syscall succeeds, or if it fails with an unexpected

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errno value, then return right away. Otherwise, fall through

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and resort to using save_cwd/restore_cwd. */

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if (FUNC_FAIL != proc_result)

-1 != proc_result	Description
TRUE	never evaluated
FALSE	never evaluated

-1 != proc_result	Description
TRUE	never evaluated
FALSE	never evaluated

-1 != proc_result	Description
TRUE	never evaluated
FALSE	never evaluated

-1 != proc_result	Description
TRUE	never evaluated
FALSE	never evaluated

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return proc_result;

never executed: return proc_result;

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if (! EXPECTED_ERRNO (proc_errno))

(proc_errno) == 20	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 2	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 1	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 13	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 38	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 95	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 20	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 2	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 1	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 13	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 38	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 95	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 20	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 2	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 1	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 13	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 38	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 95	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 20	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 2	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 1	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 13	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 38	Description
TRUE	never evaluated
FALSE	never evaluated

(proc_errno) == 95	Description
TRUE	never evaluated
FALSE	never evaluated

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{

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errno = proc_errno;

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return proc_result;

never executed: return proc_result;

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}

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}

never executed: end of block

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}

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if (save_cwd (&saved_cwd) != 0)

save_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

save_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

save_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

save_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

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openat_save_fail (errno);

never executed: openat_save_fail ( (*__errno_location ()) );

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if (0 <= fd && fd == saved_cwd.desc)

0 <= fd	Description
TRUE	never evaluated
FALSE	never evaluated

fd == saved_cwd.desc	Description
TRUE	never evaluated
FALSE	never evaluated

0 <= fd	Description
TRUE	never evaluated
FALSE	never evaluated

fd == saved_cwd.desc	Description
TRUE	never evaluated
FALSE	never evaluated

0 <= fd	Description
TRUE	never evaluated
FALSE	never evaluated

fd == saved_cwd.desc	Description
TRUE	never evaluated
FALSE	never evaluated

0 <= fd	Description
TRUE	never evaluated
FALSE	never evaluated

fd == saved_cwd.desc	Description
TRUE	never evaluated
FALSE	never evaluated

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{

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/* If saving the working directory collides with the user's

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requested fd, then the user's fd must have been closed to

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begin with. */

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free_cwd (&saved_cwd);

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errno = EBADF;

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return FUNC_FAIL;

never executed: return -1;

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}

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if (fchdir (fd) != 0)

fchdir (fd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fchdir (fd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fchdir (fd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

fchdir (fd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

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{

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saved_errno = errno;

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free_cwd (&saved_cwd);

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errno = saved_errno;

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return FUNC_FAIL;

never executed: return -1;

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}

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err = CALL_FUNC (file);

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saved_errno = (err == FUNC_FAIL ? errno : 0);

err == -1	Description
TRUE	never evaluated
FALSE	never evaluated

err == -1	Description
TRUE	never evaluated
FALSE	never evaluated

err == -1	Description
TRUE	never evaluated
FALSE	never evaluated

err == -1	Description
TRUE	never evaluated
FALSE	never evaluated

0

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if (restore_cwd (&saved_cwd) != 0)

restore_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

restore_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

restore_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

restore_cwd (&saved_cwd) != 0	Description
TRUE	never evaluated
FALSE	never evaluated

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openat_restore_fail (errno);

never executed: openat_restore_fail ( (*__errno_location ()) );

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free_cwd (&saved_cwd);

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if (saved_errno)

saved_errno	Description
TRUE	never evaluated
FALSE	never evaluated

saved_errno	Description
TRUE	never evaluated
FALSE	never evaluated

saved_errno	Description
TRUE	never evaluated
FALSE	never evaluated

saved_errno	Description
TRUE	never evaluated
FALSE	never evaluated

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errno = saved_errno;

never executed: (*__errno_location ()) = saved_errno;

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return err;

never executed: return err;

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}

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#endif

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}

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#undef CALL_FUNC

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#undef FUNC_RESULT

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#undef FUNC_FAIL

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