mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 06:10:06 +00:00
support: Add <support/xdirent.h>
Use static functions for readdir/readdir_r, so that -D_FILE_OFFSET_BITS=64 does not improperly redirect calls to the wrong implementation. Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
parent
b09a520bb6
commit
3b1d321776
@ -77,6 +77,8 @@ libsupport-routines = \
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support_quote_blob \
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support_quote_blob_wide \
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support_quote_string \
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support_readdir_check \
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support_readdir_r_check \
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support_record_failure \
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support_run_diff \
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support_select_modifies_timeout \
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@ -119,6 +121,7 @@ libsupport-routines = \
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xclock_settime_time64 \
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xclone \
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xclose \
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xclosedir \
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xconnect \
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xcopy_file_range \
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xdlfcn \
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@ -126,6 +129,7 @@ libsupport-routines = \
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xdup2 \
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xfchmod \
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xfclose \
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xfdopendir \
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xfgets \
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xfopen \
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xfork \
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@ -147,6 +151,7 @@ libsupport-routines = \
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xmunmap \
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xnewlocale \
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xopen \
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xopendir \
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xpipe \
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xpoll \
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xposix_memalign \
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@ -331,6 +336,7 @@ tests = \
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tst-test_compare_string \
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tst-test_compare_string_wide \
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tst-timespec \
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tst-xdirent \
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tst-xreadlink \
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tst-xsigstack \
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# tests
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30
support/support_readdir_check.c
Normal file
30
support/support_readdir_check.c
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@ -0,0 +1,30 @@
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/* Error-checking helper for xreaddir, xreaddir64.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <support/check.h>
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void *
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support_readdir_check (const char *name, void *result, int saved_errno)
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{
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if (result == NULL && errno != 0)
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FAIL_EXIT1 ("%s: %m", name);
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errno = saved_errno;
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return result;
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}
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35
support/support_readdir_r_check.c
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35
support/support_readdir_r_check.c
Normal file
@ -0,0 +1,35 @@
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/* Error-checking helper for xreaddir_r, xreaddir64_r.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <support/check.h>
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int
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support_readdir_r_check (const char *name, int result, void *buf, void *ptr)
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{
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if (result != 0)
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{
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errno = result;
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FAIL_EXIT1 ("%s: %m", name);
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}
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if (buf != ptr)
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FAIL_EXIT1 ("%s: buffer pointer and returned pointer differ: %p != %p",
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name, buf, ptr);
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return result;
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}
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76
support/tst-xdirent.c
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76
support/tst-xdirent.c
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@ -0,0 +1,76 @@
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/* Compile test for error-checking wrappers for <dirent.h>
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <libc-diag.h>
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#include <support/check.h>
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#include <unistd.h>
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static int
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do_test (void)
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{
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{
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DIR *d = xopendir (".");
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struct dirent *e = xreaddir (d);
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/* Assume that the "." special entry always comes first. */
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TEST_COMPARE_STRING (e->d_name, ".");
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while (xreaddir (d) != NULL)
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;
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xclosedir (d);
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}
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{
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DIR *d = xopendir (".");
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struct dirent64 *e = xreaddir64 (d);
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TEST_COMPARE_STRING (e->d_name, ".");
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while (xreaddir64 (d) != NULL)
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;
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xclosedir (d);
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}
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/* The functions readdir_r, readdir64_r were deprecated in glibc 2.24. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
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{
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DIR *d = xopendir (".");
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struct dirent buf = { 0, };
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TEST_VERIFY (xreaddir_r (d, &buf));
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TEST_COMPARE_STRING (buf.d_name, ".");
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while (xreaddir_r (d, &buf))
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;
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xclosedir (d);
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}
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{
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DIR *d = xopendir (".");
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struct dirent64 buf = { 0, };
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TEST_VERIFY (xreaddir64_r (d, &buf));
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TEST_COMPARE_STRING (buf.d_name, ".");
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while (xreaddir64_r (d, &buf))
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;
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xclosedir (d);
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}
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DIAG_POP_NEEDS_COMMENT;
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return 0;
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}
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#include <support/test-driver.c>
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28
support/xclosedir.c
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28
support/xclosedir.c
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@ -0,0 +1,28 @@
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/* Error-checking wrapper for closedir.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <support/check.h>
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void
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xclosedir (DIR *dir)
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{
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if (closedir (dir) != 0)
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FAIL_EXIT1 ("closedir: %m");
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}
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86
support/xdirent.h
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86
support/xdirent.h
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@ -0,0 +1,86 @@
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/* Error-checking wrappers for <dirent.h>
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef SUPPORT_XDIRENT_H
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#define SUPPORT_XDIRENT_H
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#include <dirent.h>
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#include <errno.h>
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#include <libc-diag.h>
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#include <stdbool.h>
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#include <stddef.h>
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__BEGIN_DECLS
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DIR *xopendir (const char *path);
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DIR *xfdopendir (int fd);
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void xclosedir (DIR *);
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void *support_readdir_check (const char *, void *, int);
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static __attribute__ ((unused)) struct dirent *
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xreaddir (DIR *stream)
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{
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int saved_errno = errno;
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errno = 0;
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struct dirent *result = readdir (stream);
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return support_readdir_check ("readdir", result, saved_errno);
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}
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static __attribute__ ((unused)) struct dirent64 *
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xreaddir64 (DIR *stream)
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{
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int saved_errno = errno;
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errno = 0;
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struct dirent64 *result = readdir64 (stream);
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return support_readdir_check ("readdir64", result, saved_errno);
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}
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/* The functions readdir_r, readdir64_r were deprecated in glibc 2.24. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
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int support_readdir_r_check (const char *, int, void *, void *);
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static __attribute__ ((unused)) bool
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xreaddir_r (DIR *stream, struct dirent *buf)
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{
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struct dirent *ptr;
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int ret = readdir_r (stream, buf, &ptr);
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if (ret == 0 && ptr == NULL)
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return false;
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support_readdir_r_check ("readdir_r", ret, buf, ptr);
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return true;
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}
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static __attribute__ ((unused)) bool
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xreaddir64_r (DIR *stream, struct dirent64 *buf)
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{
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struct dirent64 *ptr;
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int ret = readdir64_r (stream, buf, &ptr);
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if (ret == 0 && ptr == NULL)
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return false;
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support_readdir_r_check ("readdir64_r", ret, buf, ptr);
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return true;
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}
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DIAG_POP_NEEDS_COMMENT;
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__END_DECLS
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#endif /* SUPPORT_XDIRENT_H */
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30
support/xfdopendir.c
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30
support/xfdopendir.c
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@ -0,0 +1,30 @@
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/* Error-checking wrapper for fdopendir.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <support/check.h>
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DIR *
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xfdopendir (int fd)
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{
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DIR *result = fdopendir (fd);
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if (result == NULL)
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FAIL_EXIT1 ("fdopendir (%d): %m", fd);
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return result;
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}
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30
support/xopendir.c
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30
support/xopendir.c
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/* Error-checking wrapper for opendir.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdirent.h>
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#include <support/check.h>
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DIR *
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xopendir (const char *path)
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{
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DIR *result = opendir (path);
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if (result == NULL)
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FAIL_EXIT1 ("opendir (\"%s\"): %m", path);
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return result;
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}
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