| 1 | /* fstat() replacement.
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| 2 | Copyright (C) 2011-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* If the user's config.h happens to include <sys/stat.h>, let it include only
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| 18 | the system's <sys/stat.h> here, so that orig_fstat doesn't recurse to
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| 19 | rpl_fstat. */
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| 20 | #define __need_system_sys_stat_h
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| 21 | #include <config.h>
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| 22 |
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| 23 | /* Get the original definition of fstat. It might be defined as a macro. */
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| 24 | #include <sys/types.h>
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| 25 | #include <sys/stat.h>
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| 26 | #undef __need_system_sys_stat_h
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| 27 |
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| 28 | #if defined _WIN32 && ! defined __CYGWIN__
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| 29 | # define WINDOWS_NATIVE
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| 30 | #endif
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| 31 |
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| 32 | #if !defined WINDOWS_NATIVE
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| 33 |
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| 34 | static int
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| 35 | orig_fstat (int fd, struct stat *buf)
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| 36 | {
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| 37 | return fstat (fd, buf);
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| 38 | }
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| 39 |
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| 40 | #endif
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| 41 |
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| 42 | /* Specification. */
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| 43 | #ifdef __osf__
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| 44 | /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
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| 45 | eliminates this include because of the preliminary #include <sys/stat.h>
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| 46 | above. */
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| 47 | # include "sys/stat.h"
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| 48 | #else
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| 49 | # include <sys/stat.h>
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| 50 | #endif
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| 51 |
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| 52 | #include "stat-time.h"
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| 53 |
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| 54 | #include <errno.h>
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| 55 | #include <unistd.h>
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| 56 | #ifdef WINDOWS_NATIVE
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| 57 | # define WIN32_LEAN_AND_MEAN
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| 58 | # include <windows.h>
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| 59 | # if GNULIB_MSVC_NOTHROW
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| 60 | # include "msvc-nothrow.h"
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| 61 | # else
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| 62 | # include <io.h>
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| 63 | # endif
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| 64 | # include "stat-w32.h"
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| 65 | #endif
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| 66 |
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| 67 | int
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| 68 | rpl_fstat (int fd, struct stat *buf)
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| 69 | {
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| 70 | #if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY
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| 71 | /* Handle the case when rpl_open() used a dummy file descriptor to work
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| 72 | around an open() that can't normally visit directories. */
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| 73 | const char *name = _gl_directory_name (fd);
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| 74 | if (name != NULL)
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| 75 | return stat (name, buf);
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| 76 | #endif
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| 77 |
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| 78 | #ifdef WINDOWS_NATIVE
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| 79 | /* Fill the fields ourselves, because the original fstat function returns
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| 80 | values for st_atime, st_mtime, st_ctime that depend on the current time
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| 81 | zone. See
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| 82 | <https://lists.gnu.org/r/bug-gnulib/2017-04/msg00134.html> */
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| 83 | HANDLE h = (HANDLE) _get_osfhandle (fd);
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| 84 |
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| 85 | if (h == INVALID_HANDLE_VALUE)
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| 86 | {
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| 87 | errno = EBADF;
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| 88 | return -1;
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| 89 | }
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| 90 | return _gl_fstat_by_handle (h, NULL, buf);
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| 91 | #else
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| 92 | return stat_time_normalize (orig_fstat (fd, buf), buf);
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| 93 | #endif
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| 94 | }
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