| 1 | /* Test of fcntl(2).
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| 2 | Copyright (C) 2009-2012 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program 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 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 General Public License
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| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Eric Blake <ebb9@byu.net>, 2009. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* Specification. */
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| 22 | #include <fcntl.h>
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| 23 |
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| 24 | #include "signature.h"
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| 25 | SIGNATURE_CHECK (fcntl, int, (int, int, ...));
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| 26 |
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| 27 | /* Helpers. */
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| 28 | #include <errno.h>
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| 29 | #include <stdarg.h>
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| 30 | #include <stdbool.h>
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| 31 | #include <unistd.h>
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| 32 |
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| 33 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 34 | /* Get declarations of the native Windows API functions. */
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| 35 | # define WIN32_LEAN_AND_MEAN
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| 36 | # include <windows.h>
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| 37 | /* Get _get_osfhandle. */
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| 38 | # include "msvc-nothrow.h"
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| 39 | #endif
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| 40 |
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| 41 | #include "binary-io.h"
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| 42 | #include "macros.h"
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| 43 |
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| 44 | #if !O_BINARY
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| 45 | # define setmode(f,m) zero ()
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| 46 | static int zero (void) { return 0; }
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| 47 | #endif
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| 48 |
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| 49 | /* Return true if FD is open. */
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| 50 | static bool
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| 51 | is_open (int fd)
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| 52 | {
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| 53 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 54 | /* On native Windows, the initial state of unassigned standard file
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| 55 | descriptors is that they are open but point to an
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| 56 | INVALID_HANDLE_VALUE, and there is no fcntl. */
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| 57 | return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
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| 58 | #else
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| 59 | # ifndef F_GETFL
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| 60 | # error Please port fcntl to your platform
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| 61 | # endif
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| 62 | return 0 <= fcntl (fd, F_GETFL);
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| 63 | #endif
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| 64 | }
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| 65 |
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| 66 | /* Return true if FD is open and inheritable across exec/spawn. */
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| 67 | static bool
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| 68 | is_inheritable (int fd)
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| 69 | {
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| 70 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 71 | /* On native Windows, the initial state of unassigned standard file
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| 72 | descriptors is that they are open but point to an
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| 73 | INVALID_HANDLE_VALUE, and there is no fcntl. */
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| 74 | HANDLE h = (HANDLE) _get_osfhandle (fd);
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| 75 | DWORD flags;
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| 76 | if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
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| 77 | return false;
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| 78 | return (flags & HANDLE_FLAG_INHERIT) != 0;
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| 79 | #else
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| 80 | # ifndef F_GETFD
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| 81 | # error Please port fcntl to your platform
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| 82 | # endif
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| 83 | int i = fcntl (fd, F_GETFD);
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| 84 | return 0 <= i && (i & FD_CLOEXEC) == 0;
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| 85 | #endif
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| 86 | }
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| 87 |
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| 88 | /* Return non-zero if FD is open in the given MODE, which is either
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| 89 | O_TEXT or O_BINARY. */
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| 90 | static bool
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| 91 | is_mode (int fd, int mode)
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| 92 | {
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| 93 | int value = setmode (fd, O_BINARY);
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| 94 | setmode (fd, value);
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| 95 | return mode == value;
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| 96 | }
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| 97 |
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| 98 | /* Since native fcntl can have more supported operations than our
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| 99 | replacement is aware of, and since various operations assign
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| 100 | different types to the vararg argument, a wrapper around fcntl must
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| 101 | be able to pass a vararg of unknown type on through to the original
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| 102 | fcntl. Make sure that this works properly: func1 behaves like the
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| 103 | original fcntl interpreting the vararg as an int or a pointer to a
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| 104 | struct, and func2 behaves like rpl_fcntl that doesn't know what
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| 105 | type to forward. */
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| 106 | struct dummy_struct
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| 107 | {
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| 108 | long filler;
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| 109 | int value;
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| 110 | };
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| 111 | static int
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| 112 | func1 (int a, ...)
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| 113 | {
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| 114 | va_list arg;
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| 115 | int i;
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| 116 | va_start (arg, a);
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| 117 | if (a < 4)
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| 118 | i = va_arg (arg, int);
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| 119 | else
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| 120 | {
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| 121 | struct dummy_struct *s = va_arg (arg, struct dummy_struct *);
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| 122 | i = s->value;
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| 123 | }
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| 124 | va_end (arg);
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| 125 | return i;
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| 126 | }
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| 127 | static int
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| 128 | func2 (int a, ...)
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| 129 | {
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| 130 | va_list arg;
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| 131 | void *p;
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| 132 | va_start (arg, a);
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| 133 | p = va_arg (arg, void *);
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| 134 | va_end (arg);
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| 135 | return func1 (a, p);
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| 136 | }
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| 137 |
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| 138 | /* Ensure that all supported fcntl actions are distinct, and
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| 139 | usable in preprocessor expressions. */
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| 140 | static void
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| 141 | check_flags (void)
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| 142 | {
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| 143 | switch (0)
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| 144 | {
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| 145 | case F_DUPFD:
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| 146 | #if F_DUPFD
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| 147 | #endif
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| 148 |
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| 149 | case F_DUPFD_CLOEXEC:
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| 150 | #if F_DUPFD_CLOEXEC
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| 151 | #endif
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| 152 |
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| 153 | case F_GETFD:
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| 154 | #if F_GETFD
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| 155 | #endif
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| 156 |
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| 157 | #ifdef F_SETFD
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| 158 | case F_SETFD:
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| 159 | # if F_SETFD
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| 160 | # endif
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| 161 | #endif
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| 162 |
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| 163 | #ifdef F_GETFL
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| 164 | case F_GETFL:
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| 165 | # if F_GETFL
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| 166 | # endif
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| 167 | #endif
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| 168 |
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| 169 | #ifdef F_SETFL
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| 170 | case F_SETFL:
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| 171 | # if F_SETFL
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| 172 | # endif
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| 173 | #endif
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| 174 |
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| 175 | #ifdef F_GETOWN
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| 176 | case F_GETOWN:
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| 177 | # if F_GETOWN
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| 178 | # endif
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| 179 | #endif
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| 180 |
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| 181 | #ifdef F_SETOWN
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| 182 | case F_SETOWN:
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| 183 | # if F_SETOWN
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| 184 | # endif
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| 185 | #endif
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| 186 |
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| 187 | #ifdef F_GETLK
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| 188 | case F_GETLK:
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| 189 | # if F_GETLK
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| 190 | # endif
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| 191 | #endif
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| 192 |
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| 193 | #ifdef F_SETLK
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| 194 | case F_SETLK:
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| 195 | # if F_SETLK
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| 196 | # endif
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| 197 | #endif
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| 198 |
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| 199 | #ifdef F_SETLKW
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| 200 | case F_SETLKW:
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| 201 | # if F_SETLKW
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| 202 | # endif
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| 203 | #endif
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| 204 |
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| 205 | ;
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | int
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| 210 | main (void)
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| 211 | {
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| 212 | const char *file = "test-fcntl.tmp";
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| 213 | int fd;
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| 214 |
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| 215 | /* Sanity check that rpl_fcntl is likely to work. */
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| 216 | ASSERT (func2 (1, 2) == 2);
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| 217 | ASSERT (func2 (2, -2) == -2);
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| 218 | ASSERT (func2 (3, 0x80000000) == 0x80000000);
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| 219 | {
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| 220 | struct dummy_struct s = { 0L, 4 };
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| 221 | ASSERT (func2 (4, &s) == 4);
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| 222 | }
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| 223 | check_flags ();
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| 224 |
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| 225 | /* Assume std descriptors were provided by invoker, and ignore fds
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| 226 | that might have been inherited. */
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| 227 | fd = creat (file, 0600);
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| 228 | ASSERT (STDERR_FILENO < fd);
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| 229 | close (fd + 1);
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| 230 | close (fd + 2);
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| 231 |
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| 232 | /* For F_DUPFD*, the source must be valid. */
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| 233 | errno = 0;
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| 234 | ASSERT (fcntl (-1, F_DUPFD, 0) == -1);
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| 235 | ASSERT (errno == EBADF);
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| 236 | errno = 0;
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| 237 | ASSERT (fcntl (fd + 1, F_DUPFD, 0) == -1);
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| 238 | ASSERT (errno == EBADF);
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| 239 | errno = 0;
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| 240 | ASSERT (fcntl (10000000, F_DUPFD, 0) == -1);
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| 241 | ASSERT (errno == EBADF);
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| 242 | errno = 0;
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| 243 | ASSERT (fcntl (-1, F_DUPFD_CLOEXEC, 0) == -1);
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| 244 | ASSERT (errno == EBADF);
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| 245 | errno = 0;
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| 246 | ASSERT (fcntl (fd + 1, F_DUPFD_CLOEXEC, 0) == -1);
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| 247 | ASSERT (errno == EBADF);
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| 248 | errno = 0;
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| 249 | ASSERT (fcntl (10000000, F_DUPFD_CLOEXEC, 0) == -1);
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| 250 | ASSERT (errno == EBADF);
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| 251 |
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| 252 | /* For F_DUPFD*, the destination must be valid. */
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| 253 | ASSERT (getdtablesize () < 10000000);
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| 254 | errno = 0;
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| 255 | ASSERT (fcntl (fd, F_DUPFD, -1) == -1);
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| 256 | ASSERT (errno == EINVAL);
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| 257 | errno = 0;
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| 258 | ASSERT (fcntl (fd, F_DUPFD, 10000000) == -1);
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| 259 | ASSERT (errno == EINVAL);
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| 260 | ASSERT (getdtablesize () < 10000000);
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| 261 | errno = 0;
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| 262 | ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, -1) == -1);
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| 263 | ASSERT (errno == EINVAL);
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| 264 | errno = 0;
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| 265 | ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, 10000000) == -1);
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| 266 | ASSERT (errno == EINVAL);
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| 267 |
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| 268 | /* For F_DUPFD*, check for correct inheritance, as well as
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| 269 | preservation of text vs. binary. */
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| 270 | setmode (fd, O_BINARY);
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| 271 | ASSERT (is_open (fd));
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| 272 | ASSERT (!is_open (fd + 1));
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| 273 | ASSERT (!is_open (fd + 2));
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| 274 | ASSERT (is_inheritable (fd));
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| 275 | ASSERT (is_mode (fd, O_BINARY));
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| 276 |
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| 277 | ASSERT (fcntl (fd, F_DUPFD, fd) == fd + 1);
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| 278 | ASSERT (is_open (fd));
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| 279 | ASSERT (is_open (fd + 1));
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| 280 | ASSERT (!is_open (fd + 2));
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| 281 | ASSERT (is_inheritable (fd + 1));
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| 282 | ASSERT (is_mode (fd, O_BINARY));
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| 283 | ASSERT (is_mode (fd + 1, O_BINARY));
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| 284 | ASSERT (close (fd + 1) == 0);
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| 285 |
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| 286 | ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, fd + 2) == fd + 2);
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| 287 | ASSERT (is_open (fd));
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| 288 | ASSERT (!is_open (fd + 1));
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| 289 | ASSERT (is_open (fd + 2));
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| 290 | ASSERT (is_inheritable (fd));
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| 291 | ASSERT (!is_inheritable (fd + 2));
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| 292 | ASSERT (is_mode (fd, O_BINARY));
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| 293 | ASSERT (is_mode (fd + 2, O_BINARY));
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| 294 | ASSERT (close (fd) == 0);
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| 295 |
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| 296 | setmode (fd + 2, O_TEXT);
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| 297 | ASSERT (fcntl (fd + 2, F_DUPFD, fd + 1) == fd + 1);
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| 298 | ASSERT (!is_open (fd));
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| 299 | ASSERT (is_open (fd + 1));
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| 300 | ASSERT (is_open (fd + 2));
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| 301 | ASSERT (is_inheritable (fd + 1));
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| 302 | ASSERT (!is_inheritable (fd + 2));
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| 303 | ASSERT (is_mode (fd + 1, O_TEXT));
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| 304 | ASSERT (is_mode (fd + 2, O_TEXT));
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| 305 | ASSERT (close (fd + 1) == 0);
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| 306 |
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| 307 | ASSERT (fcntl (fd + 2, F_DUPFD_CLOEXEC, 0) == fd);
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| 308 | ASSERT (is_open (fd));
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| 309 | ASSERT (!is_open (fd + 1));
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| 310 | ASSERT (is_open (fd + 2));
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| 311 | ASSERT (!is_inheritable (fd));
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| 312 | ASSERT (!is_inheritable (fd + 2));
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| 313 | ASSERT (is_mode (fd, O_TEXT));
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| 314 | ASSERT (is_mode (fd + 2, O_TEXT));
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| 315 | ASSERT (close (fd + 2) == 0);
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| 316 |
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| 317 | /* Test F_GETFD on invalid file descriptors. */
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| 318 | errno = 0;
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| 319 | ASSERT (fcntl (-1, F_GETFD) == -1);
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| 320 | ASSERT (errno == EBADF);
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| 321 | errno = 0;
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| 322 | ASSERT (fcntl (fd + 1, F_GETFD) == -1);
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| 323 | ASSERT (errno == EBADF);
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| 324 | errno = 0;
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| 325 | ASSERT (fcntl (10000000, F_GETFD) == -1);
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| 326 | ASSERT (errno == EBADF);
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| 327 |
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| 328 | /* Test F_GETFD, the FD_CLOEXEC bit. */
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| 329 | {
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| 330 | int result = fcntl (fd, F_GETFD);
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| 331 | ASSERT (0 <= result);
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| 332 | ASSERT ((result & FD_CLOEXEC) == FD_CLOEXEC);
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| 333 | ASSERT (dup (fd) == fd + 1);
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| 334 | result = fcntl (fd + 1, F_GETFD);
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| 335 | ASSERT (0 <= result);
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| 336 | ASSERT ((result & FD_CLOEXEC) == 0);
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| 337 | ASSERT (close (fd + 1) == 0);
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| 338 | }
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| 339 |
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| 340 | #ifdef F_SETFD
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| 341 | /* Test F_SETFD on invalid file descriptors. */
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| 342 | errno = 0;
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| 343 | ASSERT (fcntl (-1, F_SETFD, 0) == -1);
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| 344 | ASSERT (errno == EBADF);
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| 345 | errno = 0;
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| 346 | ASSERT (fcntl (fd + 1, F_SETFD, 0) == -1);
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| 347 | ASSERT (errno == EBADF);
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| 348 | errno = 0;
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| 349 | ASSERT (fcntl (10000000, F_SETFD, 0) == -1);
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| 350 | ASSERT (errno == EBADF);
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| 351 | #endif
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| 352 |
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| 353 | #ifdef F_GETFL
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| 354 | /* Test F_GETFL on invalid file descriptors. */
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| 355 | errno = 0;
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| 356 | ASSERT (fcntl (-1, F_GETFL) == -1);
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| 357 | ASSERT (errno == EBADF);
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| 358 | errno = 0;
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| 359 | ASSERT (fcntl (fd + 1, F_GETFL) == -1);
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| 360 | ASSERT (errno == EBADF);
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| 361 | errno = 0;
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| 362 | ASSERT (fcntl (10000000, F_GETFL) == -1);
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| 363 | ASSERT (errno == EBADF);
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| 364 | #endif
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| 365 |
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| 366 | #ifdef F_SETFL
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| 367 | /* Test F_SETFL on invalid file descriptors. */
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| 368 | errno = 0;
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| 369 | ASSERT (fcntl (-1, F_SETFL, 0) == -1);
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| 370 | ASSERT (errno == EBADF);
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| 371 | errno = 0;
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| 372 | ASSERT (fcntl (fd + 1, F_SETFL, 0) == -1);
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| 373 | ASSERT (errno == EBADF);
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| 374 | errno = 0;
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| 375 | ASSERT (fcntl (10000000, F_SETFL, 0) == -1);
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| 376 | ASSERT (errno == EBADF);
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| 377 | #endif
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| 378 |
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| 379 | #ifdef F_GETOWN
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| 380 | /* Test F_GETOWN on invalid file descriptors. */
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| 381 | errno = 0;
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| 382 | ASSERT (fcntl (-1, F_GETOWN) == -1);
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| 383 | ASSERT (errno == EBADF);
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| 384 | errno = 0;
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| 385 | ASSERT (fcntl (fd + 1, F_GETOWN) == -1);
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| 386 | ASSERT (errno == EBADF);
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| 387 | errno = 0;
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| 388 | ASSERT (fcntl (10000000, F_GETOWN) == -1);
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| 389 | ASSERT (errno == EBADF);
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| 390 | #endif
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| 391 |
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| 392 | #ifdef F_SETOWN
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| 393 | /* Test F_SETFL on invalid file descriptors. */
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| 394 | errno = 0;
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| 395 | ASSERT (fcntl (-1, F_SETOWN, 0) == -1);
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| 396 | ASSERT (errno == EBADF);
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| 397 | errno = 0;
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| 398 | ASSERT (fcntl (fd + 1, F_SETOWN, 0) == -1);
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| 399 | ASSERT (errno == EBADF);
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| 400 | errno = 0;
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| 401 | ASSERT (fcntl (10000000, F_SETOWN, 0) == -1);
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| 402 | ASSERT (errno == EBADF);
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| 403 | #endif
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| 404 |
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| 405 | /* Cleanup. */
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| 406 | ASSERT (close (fd) == 0);
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| 407 | ASSERT (unlink (file) == 0);
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| 408 |
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| 409 | return 0;
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| 410 | }
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