| 1 | /* Test that dup_safer leaves standard fds alone.
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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 | #include "unistd--.h"
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| 22 |
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| 23 | #include <fcntl.h>
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| 24 | #include <errno.h>
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| 25 | #include <stdbool.h>
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| 26 | #include <stdio.h>
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| 27 |
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| 28 | #include "binary-io.h"
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| 29 | #include "cloexec.h"
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| 30 |
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| 31 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 32 | /* Get declarations of the native Windows API functions. */
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| 33 | # define WIN32_LEAN_AND_MEAN
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| 34 | # include <windows.h>
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| 35 | /* Get _get_osfhandle. */
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| 36 | # include "msvc-nothrow.h"
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| 37 | #endif
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| 38 |
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| 39 | #if !O_BINARY
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| 40 | # define setmode(f,m) zero ()
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| 41 | static int zero (void) { return 0; }
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| 42 | #endif
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| 43 |
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| 44 | /* This test intentionally closes stderr. So, we arrange to have fd 10
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| 45 | (outside the range of interesting fd's during the test) set up to
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| 46 | duplicate the original stderr. */
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| 47 |
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| 48 | #define BACKUP_STDERR_FILENO 10
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| 49 | #define ASSERT_STREAM myerr
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| 50 | #include "macros.h"
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| 51 |
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| 52 | static FILE *myerr;
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| 53 |
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| 54 | /* Return true if FD is open. */
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| 55 | static bool
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| 56 | is_open (int fd)
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| 57 | {
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| 58 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 59 | /* On native Windows, the initial state of unassigned standard file
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| 60 | descriptors is that they are open but point to an
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| 61 | INVALID_HANDLE_VALUE, and there is no fcntl. */
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| 62 | return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
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| 63 | #else
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| 64 | # ifndef F_GETFL
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| 65 | # error Please port fcntl to your platform
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| 66 | # endif
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| 67 | return 0 <= fcntl (fd, F_GETFL);
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| 68 | #endif
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| 69 | }
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| 70 |
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| 71 | /* Return true if FD is open and inheritable across exec/spawn. */
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| 72 | static bool
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| 73 | is_inheritable (int fd)
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| 74 | {
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| 75 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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| 76 | /* On native Windows, the initial state of unassigned standard file
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| 77 | descriptors is that they are open but point to an
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| 78 | INVALID_HANDLE_VALUE, and there is no fcntl. */
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| 79 | HANDLE h = (HANDLE) _get_osfhandle (fd);
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| 80 | DWORD flags;
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| 81 | if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
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| 82 | return 0;
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| 83 | return (flags & HANDLE_FLAG_INHERIT) != 0;
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| 84 | #else
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| 85 | # ifndef F_GETFD
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| 86 | # error Please port fcntl to your platform
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| 87 | # endif
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| 88 | int i = fcntl (fd, F_GETFD);
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| 89 | return 0 <= i && (i & FD_CLOEXEC) == 0;
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| 90 | #endif
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| 91 | }
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| 92 |
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| 93 | /* Return true if FD is open in the given MODE, which is either
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| 94 | O_TEXT or O_BINARY. */
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| 95 | static bool
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| 96 | is_mode (int fd, int mode)
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| 97 | {
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| 98 | int value = setmode (fd, O_BINARY);
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| 99 | setmode (fd, value);
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| 100 | return mode == value;
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| 101 | }
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| 102 |
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| 103 | #define witness "test-dup-safer.txt"
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| 104 |
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| 105 | int
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| 106 | main (void)
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| 107 | {
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| 108 | int i;
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| 109 | int fd;
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| 110 |
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| 111 | /* We close fd 2 later, so save it in fd 10. */
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| 112 | if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
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| 113 | || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
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| 114 | return 2;
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| 115 |
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| 116 | /* Create file for later checks. */
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| 117 | fd = creat (witness, 0600);
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| 118 | ASSERT (STDERR_FILENO < fd);
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| 119 |
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| 120 | /* Four iterations, with progressively more standard descriptors
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| 121 | closed. */
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| 122 | for (i = -1; i <= STDERR_FILENO; i++)
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| 123 | {
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| 124 | if (0 <= i)
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| 125 | ASSERT (close (i) == 0);
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| 126 |
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| 127 | /* Detect errors. */
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| 128 | errno = 0;
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| 129 | ASSERT (dup (-1) == -1);
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| 130 | ASSERT (errno == EBADF);
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| 131 | errno = 0;
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| 132 | ASSERT (dup (10000000) == -1);
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| 133 | ASSERT (errno == EBADF);
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| 134 | close (fd + 1);
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| 135 | errno = 0;
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| 136 | ASSERT (dup (fd + 1) == -1);
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| 137 | ASSERT (errno == EBADF);
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| 138 |
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| 139 | /* Preserve text vs. binary. */
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| 140 | setmode (fd, O_BINARY);
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| 141 | ASSERT (dup (fd) == fd + 1);
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| 142 | ASSERT (is_open (fd + 1));
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| 143 | ASSERT (is_inheritable (fd + 1));
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| 144 | ASSERT (is_mode (fd + 1, O_BINARY));
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| 145 |
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| 146 | ASSERT (close (fd + 1) == 0);
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| 147 | setmode (fd, O_TEXT);
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| 148 | ASSERT (dup (fd) == fd + 1);
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| 149 | ASSERT (is_open (fd + 1));
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| 150 | ASSERT (is_inheritable (fd + 1));
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| 151 | ASSERT (is_mode (fd + 1, O_TEXT));
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| 152 |
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| 153 | /* Create cloexec copy. */
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| 154 | ASSERT (close (fd + 1) == 0);
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| 155 | ASSERT (fd_safer_flag (dup_cloexec (fd), O_CLOEXEC) == fd + 1);
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| 156 | ASSERT (set_cloexec_flag (fd + 1, true) == 0);
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| 157 | ASSERT (is_open (fd + 1));
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| 158 | ASSERT (!is_inheritable (fd + 1));
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| 159 | ASSERT (close (fd) == 0);
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| 160 |
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| 161 | /* dup always creates inheritable copies. Also, check that
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| 162 | earliest slot past std fds is used. */
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| 163 | ASSERT (dup (fd + 1) == fd);
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| 164 | ASSERT (is_open (fd));
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| 165 | ASSERT (is_inheritable (fd));
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| 166 | ASSERT (close (fd + 1) == 0);
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| 167 | }
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| 168 |
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| 169 | /* Cleanup. */
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| 170 | ASSERT (close (fd) == 0);
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| 171 | ASSERT (unlink (witness) == 0);
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| 172 |
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| 173 | return 0;
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| 174 | }
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