| 1 | /* Provide file descriptor control.
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| 2 |
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| 3 | Copyright (C) 2009-2021 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU Lesser General Public License as
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| 7 | published by the Free Software Foundation; either version 2.1 of the
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| 8 | License, or (at your option) any later version.
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| 9 |
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| 10 | This file is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Eric Blake <[email protected]>. */
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| 19 |
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| 20 | #include <config.h>
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| 21 |
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| 22 | /* Specification. */
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| 23 | #include <fcntl.h>
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| 24 |
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| 25 | #include <errno.h>
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| 26 | #include <limits.h>
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| 27 | #include <stdarg.h>
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| 28 | #include <stdlib.h>
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| 29 | #include <unistd.h>
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| 30 |
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| 31 | #ifdef __KLIBC__
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| 32 | # define INCL_DOS
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| 33 | # include <os2.h>
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| 34 | #endif
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| 35 |
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| 36 | #if defined _WIN32 && ! defined __CYGWIN__
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| 37 | /* Get declarations of the native Windows API functions. */
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| 38 | # define WIN32_LEAN_AND_MEAN
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| 39 | # include <windows.h>
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| 40 |
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| 41 | /* Get _get_osfhandle. */
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| 42 | # if GNULIB_MSVC_NOTHROW
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| 43 | # include "msvc-nothrow.h"
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| 44 | # else
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| 45 | # include <io.h>
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| 46 | # endif
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| 47 |
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| 48 | /* Upper bound on getdtablesize(). See lib/getdtablesize.c. */
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| 49 | # define OPEN_MAX_MAX 0x10000
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| 50 |
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| 51 | /* Duplicate OLDFD into the first available slot of at least NEWFD,
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| 52 | which must be positive, with FLAGS determining whether the duplicate
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| 53 | will be inheritable. */
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| 54 | static int
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| 55 | dupfd (int oldfd, int newfd, int flags)
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| 56 | {
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| 57 | /* Mingw has no way to create an arbitrary fd. Iterate until all
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| 58 | file descriptors less than newfd are filled up. */
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| 59 | HANDLE curr_process = GetCurrentProcess ();
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| 60 | HANDLE old_handle = (HANDLE) _get_osfhandle (oldfd);
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| 61 | unsigned char fds_to_close[OPEN_MAX_MAX / CHAR_BIT];
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| 62 | unsigned int fds_to_close_bound = 0;
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| 63 | int result;
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| 64 | BOOL inherit = flags & O_CLOEXEC ? FALSE : TRUE;
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| 65 | int mode;
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| 66 |
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| 67 | if (newfd < 0 || getdtablesize () <= newfd)
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| 68 | {
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| 69 | errno = EINVAL;
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| 70 | return -1;
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| 71 | }
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| 72 | if (old_handle == INVALID_HANDLE_VALUE
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| 73 | || (mode = _setmode (oldfd, O_BINARY)) == -1)
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| 74 | {
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| 75 | /* oldfd is not open, or is an unassigned standard file
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| 76 | descriptor. */
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| 77 | errno = EBADF;
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| 78 | return -1;
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| 79 | }
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| 80 | _setmode (oldfd, mode);
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| 81 | flags |= mode;
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| 82 |
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| 83 | for (;;)
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| 84 | {
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| 85 | HANDLE new_handle;
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| 86 | int duplicated_fd;
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| 87 | unsigned int index;
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| 88 |
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| 89 | if (!DuplicateHandle (curr_process, /* SourceProcessHandle */
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| 90 | old_handle, /* SourceHandle */
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| 91 | curr_process, /* TargetProcessHandle */
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| 92 | (PHANDLE) &new_handle, /* TargetHandle */
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| 93 | (DWORD) 0, /* DesiredAccess */
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| 94 | inherit, /* InheritHandle */
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| 95 | DUPLICATE_SAME_ACCESS)) /* Options */
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| 96 | {
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| 97 | switch (GetLastError ())
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| 98 | {
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| 99 | case ERROR_TOO_MANY_OPEN_FILES:
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| 100 | errno = EMFILE;
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| 101 | break;
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| 102 | case ERROR_INVALID_HANDLE:
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| 103 | case ERROR_INVALID_TARGET_HANDLE:
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| 104 | case ERROR_DIRECT_ACCESS_HANDLE:
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| 105 | errno = EBADF;
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| 106 | break;
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| 107 | case ERROR_INVALID_PARAMETER:
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| 108 | case ERROR_INVALID_FUNCTION:
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| 109 | case ERROR_INVALID_ACCESS:
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| 110 | errno = EINVAL;
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| 111 | break;
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| 112 | default:
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| 113 | errno = EACCES;
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| 114 | break;
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| 115 | }
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| 116 | result = -1;
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| 117 | break;
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| 118 | }
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| 119 | duplicated_fd = _open_osfhandle ((intptr_t) new_handle, flags);
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| 120 | if (duplicated_fd < 0)
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| 121 | {
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| 122 | CloseHandle (new_handle);
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| 123 | result = -1;
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| 124 | break;
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| 125 | }
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| 126 | if (newfd <= duplicated_fd)
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| 127 | {
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| 128 | result = duplicated_fd;
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| 129 | break;
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| 130 | }
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| 131 |
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| 132 | /* Set the bit duplicated_fd in fds_to_close[]. */
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| 133 | index = (unsigned int) duplicated_fd / CHAR_BIT;
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| 134 | if (fds_to_close_bound <= index)
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| 135 | {
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| 136 | if (sizeof fds_to_close <= index)
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| 137 | /* Need to increase OPEN_MAX_MAX. */
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| 138 | abort ();
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| 139 | memset (fds_to_close + fds_to_close_bound, '\0',
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| 140 | index + 1 - fds_to_close_bound);
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| 141 | fds_to_close_bound = index + 1;
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| 142 | }
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| 143 | fds_to_close[index] |= 1 << ((unsigned int) duplicated_fd % CHAR_BIT);
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| 144 | }
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| 145 |
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| 146 | /* Close the previous fds that turned out to be too small. */
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| 147 | {
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| 148 | int saved_errno = errno;
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| 149 | unsigned int duplicated_fd;
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| 150 |
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| 151 | for (duplicated_fd = 0;
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| 152 | duplicated_fd < fds_to_close_bound * CHAR_BIT;
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| 153 | duplicated_fd++)
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| 154 | if ((fds_to_close[duplicated_fd / CHAR_BIT]
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| 155 | >> (duplicated_fd % CHAR_BIT))
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| 156 | & 1)
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| 157 | close (duplicated_fd);
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| 158 |
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| 159 | errno = saved_errno;
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| 160 | }
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| 161 |
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| 162 | # if REPLACE_FCHDIR
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| 163 | if (0 <= result)
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| 164 | result = _gl_register_dup (oldfd, result);
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| 165 | # endif
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| 166 | return result;
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| 167 | }
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| 168 | #endif /* W32 */
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| 169 |
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| 170 | /* Forward declarations, because we '#undef fcntl' in the middle of this
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| 171 | compilation unit. */
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| 172 | /* Our implementation of fcntl (fd, F_DUPFD, target). */
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| 173 | static int rpl_fcntl_DUPFD (int fd, int target);
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| 174 | /* Our implementation of fcntl (fd, F_DUPFD_CLOEXEC, target). */
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| 175 | static int rpl_fcntl_DUPFD_CLOEXEC (int fd, int target);
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| 176 | #ifdef __KLIBC__
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| 177 | /* Adds support for fcntl on directories. */
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| 178 | static int klibc_fcntl (int fd, int action, /* arg */...);
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| 179 | #endif
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| 180 |
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| 181 |
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| 182 | /* Perform the specified ACTION on the file descriptor FD, possibly
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| 183 | using the argument ARG further described below. This replacement
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| 184 | handles the following actions, and forwards all others on to the
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| 185 | native fcntl. An unrecognized ACTION returns -1 with errno set to
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| 186 | EINVAL.
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| 187 |
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| 188 | F_DUPFD - duplicate FD, with int ARG being the minimum target fd.
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| 189 | If successful, return the duplicate, which will be inheritable;
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| 190 | otherwise return -1 and set errno.
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| 191 |
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| 192 | F_DUPFD_CLOEXEC - duplicate FD, with int ARG being the minimum
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| 193 | target fd. If successful, return the duplicate, which will not be
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| 194 | inheritable; otherwise return -1 and set errno.
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| 195 |
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| 196 | F_GETFD - ARG need not be present. If successful, return a
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| 197 | non-negative value containing the descriptor flags of FD (only
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| 198 | FD_CLOEXEC is portable, but other flags may be present); otherwise
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| 199 | return -1 and set errno. */
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| 200 |
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| 201 | int
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| 202 | fcntl (int fd, int action, /* arg */...)
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| 203 | #undef fcntl
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| 204 | #ifdef __KLIBC__
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| 205 | # define fcntl klibc_fcntl
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| 206 | #endif
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| 207 | {
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| 208 | va_list arg;
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| 209 | int result = -1;
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| 210 | va_start (arg, action);
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| 211 | switch (action)
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| 212 | {
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| 213 | case F_DUPFD:
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| 214 | {
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| 215 | int target = va_arg (arg, int);
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| 216 | result = rpl_fcntl_DUPFD (fd, target);
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| 217 | break;
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| 218 | }
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| 219 |
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| 220 | case F_DUPFD_CLOEXEC:
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| 221 | {
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| 222 | int target = va_arg (arg, int);
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| 223 | result = rpl_fcntl_DUPFD_CLOEXEC (fd, target);
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| 224 | break;
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| 225 | }
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| 226 |
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| 227 | #if !HAVE_FCNTL
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| 228 | case F_GETFD:
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| 229 | {
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| 230 | # if defined _WIN32 && ! defined __CYGWIN__
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| 231 | HANDLE handle = (HANDLE) _get_osfhandle (fd);
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| 232 | DWORD flags;
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| 233 | if (handle == INVALID_HANDLE_VALUE
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| 234 | || GetHandleInformation (handle, &flags) == 0)
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| 235 | errno = EBADF;
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| 236 | else
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| 237 | result = (flags & HANDLE_FLAG_INHERIT) ? 0 : FD_CLOEXEC;
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| 238 | # else /* !W32 */
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| 239 | /* Use dup2 to reject invalid file descriptors. No way to
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| 240 | access this information, so punt. */
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| 241 | if (0 <= dup2 (fd, fd))
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| 242 | result = 0;
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| 243 | # endif /* !W32 */
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| 244 | break;
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| 245 | } /* F_GETFD */
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| 246 | #endif /* !HAVE_FCNTL */
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| 247 |
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| 248 | /* Implementing F_SETFD on mingw is not trivial - there is no
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| 249 | API for changing the O_NOINHERIT bit on an fd, and merely
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| 250 | changing the HANDLE_FLAG_INHERIT bit on the underlying handle
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| 251 | can lead to odd state. It may be possible by duplicating the
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| 252 | handle, using _open_osfhandle with the right flags, then
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| 253 | using dup2 to move the duplicate onto the original, but that
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| 254 | is not supported for now. */
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| 255 |
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| 256 | default:
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| 257 | {
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| 258 | #if HAVE_FCNTL
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| 259 | switch (action)
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| 260 | {
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| 261 | #ifdef F_BARRIERFSYNC /* macOS */
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| 262 | case F_BARRIERFSYNC:
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| 263 | #endif
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| 264 | #ifdef F_CHKCLEAN /* macOS */
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| 265 | case F_CHKCLEAN:
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| 266 | #endif
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| 267 | #ifdef F_CLOSEM /* NetBSD, HP-UX */
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| 268 | case F_CLOSEM:
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| 269 | #endif
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| 270 | #ifdef F_FLUSH_DATA /* macOS */
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| 271 | case F_FLUSH_DATA:
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| 272 | #endif
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| 273 | #ifdef F_FREEZE_FS /* macOS */
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| 274 | case F_FREEZE_FS:
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| 275 | #endif
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| 276 | #ifdef F_FULLFSYNC /* macOS */
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| 277 | case F_FULLFSYNC:
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| 278 | #endif
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| 279 | #ifdef F_GETCONFINED /* macOS */
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| 280 | case F_GETCONFINED:
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| 281 | #endif
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| 282 | #ifdef F_GETDEFAULTPROTLEVEL /* macOS */
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| 283 | case F_GETDEFAULTPROTLEVEL:
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| 284 | #endif
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| 285 | #ifdef F_GETFD /* POSIX */
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| 286 | case F_GETFD:
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| 287 | #endif
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| 288 | #ifdef F_GETFL /* POSIX */
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| 289 | case F_GETFL:
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| 290 | #endif
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| 291 | #ifdef F_GETLEASE /* Linux */
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| 292 | case F_GETLEASE:
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| 293 | #endif
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| 294 | #ifdef F_GETNOSIGPIPE /* macOS */
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| 295 | case F_GETNOSIGPIPE:
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| 296 | #endif
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| 297 | #ifdef F_GETOWN /* POSIX */
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| 298 | case F_GETOWN:
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| 299 | #endif
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| 300 | #ifdef F_GETPIPE_SZ /* Linux */
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| 301 | case F_GETPIPE_SZ:
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| 302 | #endif
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| 303 | #ifdef F_GETPROTECTIONCLASS /* macOS */
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| 304 | case F_GETPROTECTIONCLASS:
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| 305 | #endif
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| 306 | #ifdef F_GETPROTECTIONLEVEL /* macOS */
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| 307 | case F_GETPROTECTIONLEVEL:
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| 308 | #endif
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| 309 | #ifdef F_GET_SEALS /* Linux */
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| 310 | case F_GET_SEALS:
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| 311 | #endif
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| 312 | #ifdef F_GETSIG /* Linux */
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| 313 | case F_GETSIG:
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| 314 | #endif
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| 315 | #ifdef F_MAXFD /* NetBSD */
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| 316 | case F_MAXFD:
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| 317 | #endif
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| 318 | #ifdef F_RECYCLE /* macOS */
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| 319 | case F_RECYCLE:
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| 320 | #endif
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| 321 | #ifdef F_SETFIFOENH /* HP-UX */
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| 322 | case F_SETFIFOENH:
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| 323 | #endif
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| 324 | #ifdef F_THAW_FS /* macOS */
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| 325 | case F_THAW_FS:
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| 326 | #endif
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| 327 | /* These actions take no argument. */
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| 328 | result = fcntl (fd, action);
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| 329 | break;
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| 330 |
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| 331 | #ifdef F_ADD_SEALS /* Linux */
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| 332 | case F_ADD_SEALS:
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| 333 | #endif
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| 334 | #ifdef F_BADFD /* Solaris */
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| 335 | case F_BADFD:
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| 336 | #endif
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| 337 | #ifdef F_CHECK_OPENEVT /* macOS */
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| 338 | case F_CHECK_OPENEVT:
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| 339 | #endif
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| 340 | #ifdef F_DUP2FD /* FreeBSD, AIX, Solaris */
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| 341 | case F_DUP2FD:
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| 342 | #endif
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| 343 | #ifdef F_DUP2FD_CLOEXEC /* FreeBSD, Solaris */
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| 344 | case F_DUP2FD_CLOEXEC:
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| 345 | #endif
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| 346 | #ifdef F_DUP2FD_CLOFORK /* Solaris */
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| 347 | case F_DUP2FD_CLOFORK:
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| 348 | #endif
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| 349 | #ifdef F_DUPFD /* POSIX */
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| 350 | case F_DUPFD:
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| 351 | #endif
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| 352 | #ifdef F_DUPFD_CLOEXEC /* POSIX */
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| 353 | case F_DUPFD_CLOEXEC:
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| 354 | #endif
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| 355 | #ifdef F_DUPFD_CLOFORK /* Solaris */
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| 356 | case F_DUPFD_CLOFORK:
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| 357 | #endif
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| 358 | #ifdef F_GETXFL /* Solaris */
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| 359 | case F_GETXFL:
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| 360 | #endif
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| 361 | #ifdef F_GLOBAL_NOCACHE /* macOS */
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| 362 | case F_GLOBAL_NOCACHE:
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| 363 | #endif
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| 364 | #ifdef F_MAKECOMPRESSED /* macOS */
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| 365 | case F_MAKECOMPRESSED:
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| 366 | #endif
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| 367 | #ifdef F_MOVEDATAEXTENTS /* macOS */
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| 368 | case F_MOVEDATAEXTENTS:
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| 369 | #endif
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| 370 | #ifdef F_NOCACHE /* macOS */
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| 371 | case F_NOCACHE:
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| 372 | #endif
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| 373 | #ifdef F_NODIRECT /* macOS */
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| 374 | case F_NODIRECT:
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| 375 | #endif
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| 376 | #ifdef F_NOTIFY /* Linux */
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| 377 | case F_NOTIFY:
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| 378 | #endif
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| 379 | #ifdef F_OPLKACK /* IRIX */
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| 380 | case F_OPLKACK:
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| 381 | #endif
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| 382 | #ifdef F_OPLKREG /* IRIX */
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| 383 | case F_OPLKREG:
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| 384 | #endif
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| 385 | #ifdef F_RDAHEAD /* macOS */
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| 386 | case F_RDAHEAD:
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| 387 | #endif
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| 388 | #ifdef F_SETBACKINGSTORE /* macOS */
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| 389 | case F_SETBACKINGSTORE:
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| 390 | #endif
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| 391 | #ifdef F_SETCONFINED /* macOS */
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| 392 | case F_SETCONFINED:
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| 393 | #endif
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| 394 | #ifdef F_SETFD /* POSIX */
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| 395 | case F_SETFD:
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| 396 | #endif
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| 397 | #ifdef F_SETFL /* POSIX */
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| 398 | case F_SETFL:
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| 399 | #endif
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| 400 | #ifdef F_SETLEASE /* Linux */
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| 401 | case F_SETLEASE:
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| 402 | #endif
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| 403 | #ifdef F_SETNOSIGPIPE /* macOS */
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| 404 | case F_SETNOSIGPIPE:
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| 405 | #endif
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| 406 | #ifdef F_SETOWN /* POSIX */
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| 407 | case F_SETOWN:
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| 408 | #endif
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| 409 | #ifdef F_SETPIPE_SZ /* Linux */
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| 410 | case F_SETPIPE_SZ:
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| 411 | #endif
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| 412 | #ifdef F_SETPROTECTIONCLASS /* macOS */
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| 413 | case F_SETPROTECTIONCLASS:
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| 414 | #endif
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| 415 | #ifdef F_SETSIG /* Linux */
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| 416 | case F_SETSIG:
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| 417 | #endif
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| 418 | #ifdef F_SINGLE_WRITER /* macOS */
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| 419 | case F_SINGLE_WRITER:
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| 420 | #endif
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| 421 | /* These actions take an 'int' argument. */
|
|---|
| 422 | {
|
|---|
| 423 | int x = va_arg (arg, int);
|
|---|
| 424 | result = fcntl (fd, action, x);
|
|---|
| 425 | }
|
|---|
| 426 | break;
|
|---|
| 427 |
|
|---|
| 428 | default:
|
|---|
| 429 | /* Other actions take a pointer argument. */
|
|---|
| 430 | {
|
|---|
| 431 | void *p = va_arg (arg, void *);
|
|---|
| 432 | result = fcntl (fd, action, p);
|
|---|
| 433 | }
|
|---|
| 434 | break;
|
|---|
| 435 | }
|
|---|
| 436 | #else
|
|---|
| 437 | errno = EINVAL;
|
|---|
| 438 | #endif
|
|---|
| 439 | break;
|
|---|
| 440 | }
|
|---|
| 441 | }
|
|---|
| 442 | va_end (arg);
|
|---|
| 443 | return result;
|
|---|
| 444 | }
|
|---|
| 445 |
|
|---|
| 446 | static int
|
|---|
| 447 | rpl_fcntl_DUPFD (int fd, int target)
|
|---|
| 448 | {
|
|---|
| 449 | int result;
|
|---|
| 450 | #if !HAVE_FCNTL
|
|---|
| 451 | result = dupfd (fd, target, 0);
|
|---|
| 452 | #elif FCNTL_DUPFD_BUGGY || REPLACE_FCHDIR
|
|---|
| 453 | /* Detect invalid target; needed for cygwin 1.5.x. */
|
|---|
| 454 | if (target < 0 || getdtablesize () <= target)
|
|---|
| 455 | {
|
|---|
| 456 | result = -1;
|
|---|
| 457 | errno = EINVAL;
|
|---|
| 458 | }
|
|---|
| 459 | else
|
|---|
| 460 | {
|
|---|
| 461 | /* Haiku alpha 2 loses fd flags on original. */
|
|---|
| 462 | int flags = fcntl (fd, F_GETFD);
|
|---|
| 463 | if (flags < 0)
|
|---|
| 464 | result = -1;
|
|---|
| 465 | else
|
|---|
| 466 | {
|
|---|
| 467 | result = fcntl (fd, F_DUPFD, target);
|
|---|
| 468 | if (0 <= result && fcntl (fd, F_SETFD, flags) == -1)
|
|---|
| 469 | {
|
|---|
| 470 | int saved_errno = errno;
|
|---|
| 471 | close (result);
|
|---|
| 472 | result = -1;
|
|---|
| 473 | errno = saved_errno;
|
|---|
| 474 | }
|
|---|
| 475 | # if REPLACE_FCHDIR
|
|---|
| 476 | if (0 <= result)
|
|---|
| 477 | result = _gl_register_dup (fd, result);
|
|---|
| 478 | # endif
|
|---|
| 479 | }
|
|---|
| 480 | }
|
|---|
| 481 | #else
|
|---|
| 482 | result = fcntl (fd, F_DUPFD, target);
|
|---|
| 483 | #endif
|
|---|
| 484 | return result;
|
|---|
| 485 | }
|
|---|
| 486 |
|
|---|
| 487 | static int
|
|---|
| 488 | rpl_fcntl_DUPFD_CLOEXEC (int fd, int target)
|
|---|
| 489 | {
|
|---|
| 490 | int result;
|
|---|
| 491 | #if !HAVE_FCNTL
|
|---|
| 492 | result = dupfd (fd, target, O_CLOEXEC);
|
|---|
| 493 | #else /* HAVE_FCNTL */
|
|---|
| 494 | # if defined __NetBSD__ || defined __HAIKU__
|
|---|
| 495 | /* On NetBSD 9.0, the system fcntl (fd, F_DUPFD_CLOEXEC, target)
|
|---|
| 496 | has only the same effect as fcntl (fd, F_DUPFD, target). */
|
|---|
| 497 | /* On Haiku, the system fcntl (fd, F_DUPFD_CLOEXEC, target) sets
|
|---|
| 498 | the FD_CLOEXEC flag on fd, not on target. Therefore avoid the
|
|---|
| 499 | system fcntl in this case. */
|
|---|
| 500 | # define have_dupfd_cloexec -1
|
|---|
| 501 | # else
|
|---|
| 502 | /* Try the system call first, if the headers claim it exists
|
|---|
| 503 | (that is, if GNULIB_defined_F_DUPFD_CLOEXEC is 0), since we
|
|---|
| 504 | may be running with a glibc that has the macro but with an
|
|---|
| 505 | older kernel that does not support it. Cache the
|
|---|
| 506 | information on whether the system call really works, but
|
|---|
| 507 | avoid caching failure if the corresponding F_DUPFD fails
|
|---|
| 508 | for any reason. 0 = unknown, 1 = yes, -1 = no. */
|
|---|
| 509 | static int have_dupfd_cloexec = GNULIB_defined_F_DUPFD_CLOEXEC ? -1 : 0;
|
|---|
| 510 | if (0 <= have_dupfd_cloexec)
|
|---|
| 511 | {
|
|---|
| 512 | result = fcntl (fd, F_DUPFD_CLOEXEC, target);
|
|---|
| 513 | if (0 <= result || errno != EINVAL)
|
|---|
| 514 | {
|
|---|
| 515 | have_dupfd_cloexec = 1;
|
|---|
| 516 | # if REPLACE_FCHDIR
|
|---|
| 517 | if (0 <= result)
|
|---|
| 518 | result = _gl_register_dup (fd, result);
|
|---|
| 519 | # endif
|
|---|
| 520 | }
|
|---|
| 521 | else
|
|---|
| 522 | {
|
|---|
| 523 | result = rpl_fcntl_DUPFD (fd, target);
|
|---|
| 524 | if (result >= 0)
|
|---|
| 525 | have_dupfd_cloexec = -1;
|
|---|
| 526 | }
|
|---|
| 527 | }
|
|---|
| 528 | else
|
|---|
| 529 | # endif
|
|---|
| 530 | result = rpl_fcntl_DUPFD (fd, target);
|
|---|
| 531 | if (0 <= result && have_dupfd_cloexec == -1)
|
|---|
| 532 | {
|
|---|
| 533 | int flags = fcntl (result, F_GETFD);
|
|---|
| 534 | if (flags < 0 || fcntl (result, F_SETFD, flags | FD_CLOEXEC) == -1)
|
|---|
| 535 | {
|
|---|
| 536 | int saved_errno = errno;
|
|---|
| 537 | close (result);
|
|---|
| 538 | errno = saved_errno;
|
|---|
| 539 | result = -1;
|
|---|
| 540 | }
|
|---|
| 541 | }
|
|---|
| 542 | #endif /* HAVE_FCNTL */
|
|---|
| 543 | return result;
|
|---|
| 544 | }
|
|---|
| 545 |
|
|---|
| 546 | #undef fcntl
|
|---|
| 547 |
|
|---|
| 548 | #ifdef __KLIBC__
|
|---|
| 549 |
|
|---|
| 550 | static int
|
|---|
| 551 | klibc_fcntl (int fd, int action, /* arg */...)
|
|---|
| 552 | {
|
|---|
| 553 | va_list arg_ptr;
|
|---|
| 554 | int arg;
|
|---|
| 555 | struct stat sbuf;
|
|---|
| 556 | int result;
|
|---|
| 557 |
|
|---|
| 558 | va_start (arg_ptr, action);
|
|---|
| 559 | arg = va_arg (arg_ptr, int);
|
|---|
| 560 | result = fcntl (fd, action, arg);
|
|---|
| 561 | /* EPERM for F_DUPFD, ENOTSUP for others */
|
|---|
| 562 | if (result == -1 && (errno == EPERM || errno == ENOTSUP)
|
|---|
| 563 | && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
|
|---|
| 564 | {
|
|---|
| 565 | ULONG ulMode;
|
|---|
| 566 |
|
|---|
| 567 | switch (action)
|
|---|
| 568 | {
|
|---|
| 569 | case F_DUPFD:
|
|---|
| 570 | /* Find available fd */
|
|---|
| 571 | while (fcntl (arg, F_GETFL) != -1 || errno != EBADF)
|
|---|
| 572 | arg++;
|
|---|
| 573 |
|
|---|
| 574 | result = dup2 (fd, arg);
|
|---|
| 575 | break;
|
|---|
| 576 |
|
|---|
| 577 | /* Using underlying APIs is right ? */
|
|---|
| 578 | case F_GETFD:
|
|---|
| 579 | if (DosQueryFHState (fd, &ulMode))
|
|---|
| 580 | break;
|
|---|
| 581 |
|
|---|
| 582 | result = (ulMode & OPEN_FLAGS_NOINHERIT) ? FD_CLOEXEC : 0;
|
|---|
| 583 | break;
|
|---|
| 584 |
|
|---|
| 585 | case F_SETFD:
|
|---|
| 586 | if (arg & ~FD_CLOEXEC)
|
|---|
| 587 | break;
|
|---|
| 588 |
|
|---|
| 589 | if (DosQueryFHState (fd, &ulMode))
|
|---|
| 590 | break;
|
|---|
| 591 |
|
|---|
| 592 | if (arg & FD_CLOEXEC)
|
|---|
| 593 | ulMode |= OPEN_FLAGS_NOINHERIT;
|
|---|
| 594 | else
|
|---|
| 595 | ulMode &= ~OPEN_FLAGS_NOINHERIT;
|
|---|
| 596 |
|
|---|
| 597 | /* Filter supported flags. */
|
|---|
| 598 | ulMode &= (OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR
|
|---|
| 599 | | OPEN_FLAGS_NO_CACHE | OPEN_FLAGS_NOINHERIT);
|
|---|
| 600 |
|
|---|
| 601 | if (DosSetFHState (fd, ulMode))
|
|---|
| 602 | break;
|
|---|
| 603 |
|
|---|
| 604 | result = 0;
|
|---|
| 605 | break;
|
|---|
| 606 |
|
|---|
| 607 | case F_GETFL:
|
|---|
| 608 | result = 0;
|
|---|
| 609 | break;
|
|---|
| 610 |
|
|---|
| 611 | case F_SETFL:
|
|---|
| 612 | if (arg != 0)
|
|---|
| 613 | break;
|
|---|
| 614 |
|
|---|
| 615 | result = 0;
|
|---|
| 616 | break;
|
|---|
| 617 |
|
|---|
| 618 | default:
|
|---|
| 619 | errno = EINVAL;
|
|---|
| 620 | break;
|
|---|
| 621 | }
|
|---|
| 622 | }
|
|---|
| 623 |
|
|---|
| 624 | va_end (arg_ptr);
|
|---|
| 625 |
|
|---|
| 626 | return result;
|
|---|
| 627 | }
|
|---|
| 628 |
|
|---|
| 629 | #endif
|
|---|
