mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
6ec2e0f5bd
These two modules are necessary because of the rework that will be done in the "change directory" logic on GDB/gdbserver in the next commits. First, we will get rid of the "gdb_dirbuf" global variable and instead rely on the fact that "getcwd (NULL, 0)", which is a GNU extension, returns a heap-allocated string with the necessary bytes to hold the full path. This is a good practice not only because globals are not ideal but also because there is no good way to know beforehand the size of the full pathname allowed in the filesystem ("PATH_MAX" is not portable and does not reflect all the possible filesystems out there). We will also have a way to "cd" to a directory also on gdbserver, but in order to do that uniformly, there must be a way to do tilde expansion on directories provided by the user. Currently, GDB uses "tilde_expand" from readline to do that, but gdbserver doesn't link against readline and therefore cannot use this function. The solution is to use "glob" instead, which can perform tilde expansion as a GNU extension. Therefore, we need gnulib's version of "glob". A special note is necessary for gdb/ser-tcp.c. It defines "close" as "closesocket" on Win32 targets. If we leave the code as is, this would conflict with gnulib's definition of "close". Therefore, in order to keep the same code path from before this import, I decided to "#undef close" first, and then let the original (re)definition of it take place. gdb/ChangeLog: 2017-09-22 Sergio Durigan Junior <sergiodj@redhat.com> * gnulib/aclocal.m4: Regenerate. * gnulib/config.in: Regenerate. * gnulib/configure: Regenerate. * gnulib/import/Makefile.am: Regenerate. * gnulib/import/Makefile.in: Regenerate. * gnulib/import/assure.h: New file. * gnulib/import/at-func.c: Likewise * gnulib/import/chdir-long.c: New file. * gnulib/import/chdir-long.h: New file. * gnulib/import/cloexec.c: New file. * gnulib/import/cloexec.h: New file. * gnulib/import/close.c: New file. * gnulib/import/closedir.c: New file. * gnulib/import/dirent-private.h: New file. * gnulib/import/dup-safer.c: New file. * gnulib/import/dup.c: New file. * gnulib/import/dup2.c: New file. * gnulib/import/error.c: New file. * gnulib/import/error.h: New file. * gnulib/import/exitfail.c: New file. * gnulib/import/exitfail.h: New file. * gnulib/import/fchdir.c: New file. * gnulib/import/fcntl.c: New file. * gnulib/import/fcntl.in.h: New file. * gnulib/import/fd-hook.c: New file. * gnulib/import/fd-hook.h: New file. * gnulib/import/fd-safer.c: New file. * gnulib/import/fdopendir.c: New file. * gnulib/import/filename.h: New file. * gnulib/import/filenamecat-lgpl.c: New file. * gnulib/import/filenamecat.h: New file. * gnulib/import/fstat.c: New file. * gnulib/import/fstatat.c: New file. * gnulib/import/getcwd-lgpl.c: New file. * gnulib/import/getcwd.c: New file. * gnulib/import/getdtablesize.c: New file. * gnulib/import/getlogin_r.c: New file. * gnulib/import/getprogname.c: New file. * gnulib/import/getprogname.h: New file. * gnulib/import/gettext.h: New file. * gnulib/import/glob-libc.h: New file. * gnulib/import/glob.c: New file. * gnulib/import/glob.in.h: New file. * gnulib/import/intprops.h: New file. * gnulib/import/m4/chdir-long.m4: New file. * gnulib/import/m4/close.m4: New file. * gnulib/import/m4/closedir.m4: New file. * gnulib/import/m4/d-ino.m4: New file. * gnulib/import/m4/d-type.m4: New file. * gnulib/import/m4/dup.m4: New file. * gnulib/import/m4/dup2.m4: New file. * gnulib/import/m4/error.m4: New file. * gnulib/import/m4/fchdir.m4: New file. * gnulib/import/m4/fcntl.m4: New file. * gnulib/import/m4/fcntl_h.m4: New file. * gnulib/import/m4/fdopendir.m4: New file. * gnulib/import/m4/filenamecat.m4: New file. * gnulib/import/m4/fstat.m4: New file. * gnulib/import/m4/fstatat.m4: New file. * gnulib/import/m4/getcwd-abort-bug.m4: New file. * gnulib/import/m4/getcwd-path-max.m4: New file. * gnulib/import/m4/getcwd.m4: New file. * gnulib/import/m4/getdtablesize.m4: New file. * gnulib/import/m4/getlogin_r.m4: New file. * gnulib/import/m4/getprogname.m4: New file. * gnulib/import/m4/glob.m4: New file. * gnulib/import/m4/gnulib-cache.m4: Regenerate. * gnulib/import/m4/gnulib-comp.m4: Regenerate. * gnulib/import/m4/mempcpy.m4: New file. * gnulib/import/m4/memrchr.m4: New file. * gnulib/import/m4/mode_t.m4: New file. * gnulib/import/m4/msvc-inval.m4: New file. * gnulib/import/m4/msvc-nothrow.m4: New file. * gnulib/import/m4/open.m4: New file. * gnulib/import/m4/openat.m4: New file. * gnulib/import/m4/opendir.m4: New file. * gnulib/import/m4/readdir.m4: New file. * gnulib/import/m4/realloc.m4: New file. * gnulib/import/m4/rewinddir.m4: New file. * gnulib/import/m4/save-cwd.m4: New file. * gnulib/import/m4/strdup.m4: New file. * gnulib/import/m4/strerror.m4: New file. * gnulib/import/m4/unistd-safer.m4: New file. * gnulib/import/mempcpy.c: New file. * gnulib/import/memrchr.c: New file. * gnulib/import/msvc-inval.c: New file. * gnulib/import/msvc-inval.h: New file. * gnulib/import/msvc-nothrow.c: New file. * gnulib/import/msvc-nothrow.h: New file. * gnulib/import/open.c: New file. * gnulib/import/openat-die.c: New file. * gnulib/import/openat-priv.h: New file. * gnulib/import/openat-proc.c: New file. * gnulib/import/openat.c: New file. * gnulib/import/openat.h: New file. * gnulib/import/opendir.c: New file. * gnulib/import/pipe-safer.c: New file. * gnulib/import/readdir.c: New file. * gnulib/import/realloc.c: New file. * gnulib/import/rewinddir.c: New file. * gnulib/import/save-cwd.c: New file. * gnulib/import/save-cwd.h: New file. * gnulib/import/strdup.c: New file. * gnulib/import/strerror-override.c: New file. * gnulib/import/strerror-override.h: New file. * gnulib/import/strerror.c: New file. * gnulib/import/unistd--.h: New file. * gnulib/import/unistd-safer.h: New file. * gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add "getcwd" and "glob". * ser-tcp.c: Undefine "close" before redefining it.
415 lines
12 KiB
C
415 lines
12 KiB
C
/* Provide file descriptor control.
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Copyright (C) 2009-2016 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Eric Blake <ebb9@byu.net>. */
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#include <config.h>
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/* Specification. */
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <unistd.h>
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#if !HAVE_FCNTL
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# define rpl_fcntl fcntl
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#endif
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#undef fcntl
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* Get declarations of the native Windows API functions. */
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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/* Get _get_osfhandle. */
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# include "msvc-nothrow.h"
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/* Upper bound on getdtablesize(). See lib/getdtablesize.c. */
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# define OPEN_MAX_MAX 0x10000
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/* Duplicate OLDFD into the first available slot of at least NEWFD,
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which must be positive, with FLAGS determining whether the duplicate
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will be inheritable. */
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static int
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dupfd (int oldfd, int newfd, int flags)
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{
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/* Mingw has no way to create an arbitrary fd. Iterate until all
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file descriptors less than newfd are filled up. */
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HANDLE curr_process = GetCurrentProcess ();
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HANDLE old_handle = (HANDLE) _get_osfhandle (oldfd);
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unsigned char fds_to_close[OPEN_MAX_MAX / CHAR_BIT];
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unsigned int fds_to_close_bound = 0;
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int result;
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BOOL inherit = flags & O_CLOEXEC ? FALSE : TRUE;
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int mode;
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if (newfd < 0 || getdtablesize () <= newfd)
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{
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errno = EINVAL;
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return -1;
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}
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if (old_handle == INVALID_HANDLE_VALUE
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|| (mode = setmode (oldfd, O_BINARY)) == -1)
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{
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/* oldfd is not open, or is an unassigned standard file
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descriptor. */
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errno = EBADF;
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return -1;
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}
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setmode (oldfd, mode);
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flags |= mode;
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for (;;)
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{
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HANDLE new_handle;
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int duplicated_fd;
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unsigned int index;
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if (!DuplicateHandle (curr_process, /* SourceProcessHandle */
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old_handle, /* SourceHandle */
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curr_process, /* TargetProcessHandle */
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(PHANDLE) &new_handle, /* TargetHandle */
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(DWORD) 0, /* DesiredAccess */
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inherit, /* InheritHandle */
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DUPLICATE_SAME_ACCESS)) /* Options */
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{
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switch (GetLastError ())
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{
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case ERROR_TOO_MANY_OPEN_FILES:
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errno = EMFILE;
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break;
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case ERROR_INVALID_HANDLE:
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case ERROR_INVALID_TARGET_HANDLE:
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case ERROR_DIRECT_ACCESS_HANDLE:
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errno = EBADF;
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break;
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case ERROR_INVALID_PARAMETER:
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case ERROR_INVALID_FUNCTION:
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case ERROR_INVALID_ACCESS:
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errno = EINVAL;
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break;
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default:
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errno = EACCES;
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break;
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}
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result = -1;
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break;
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}
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duplicated_fd = _open_osfhandle ((intptr_t) new_handle, flags);
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if (duplicated_fd < 0)
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{
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CloseHandle (new_handle);
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result = -1;
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break;
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}
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if (newfd <= duplicated_fd)
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{
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result = duplicated_fd;
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break;
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}
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/* Set the bit duplicated_fd in fds_to_close[]. */
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index = (unsigned int) duplicated_fd / CHAR_BIT;
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if (fds_to_close_bound <= index)
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{
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if (sizeof fds_to_close <= index)
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/* Need to increase OPEN_MAX_MAX. */
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abort ();
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memset (fds_to_close + fds_to_close_bound, '\0',
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index + 1 - fds_to_close_bound);
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fds_to_close_bound = index + 1;
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}
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fds_to_close[index] |= 1 << ((unsigned int) duplicated_fd % CHAR_BIT);
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}
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/* Close the previous fds that turned out to be too small. */
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{
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int saved_errno = errno;
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unsigned int duplicated_fd;
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for (duplicated_fd = 0;
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duplicated_fd < fds_to_close_bound * CHAR_BIT;
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duplicated_fd++)
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if ((fds_to_close[duplicated_fd / CHAR_BIT]
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>> (duplicated_fd % CHAR_BIT))
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& 1)
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close (duplicated_fd);
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errno = saved_errno;
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}
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# if REPLACE_FCHDIR
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if (0 <= result)
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result = _gl_register_dup (oldfd, result);
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# endif
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return result;
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}
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#endif /* W32 */
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#ifdef __KLIBC__
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# define INCL_DOS
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# include <os2.h>
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static int
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klibc_fcntl (int fd, int action, /* arg */...)
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{
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va_list arg_ptr;
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int arg;
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struct stat sbuf;
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int result = -1;
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va_start (arg_ptr, action);
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arg = va_arg (arg_ptr, int);
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result = fcntl (fd, action, arg);
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/* EPERM for F_DUPFD, ENOTSUP for others */
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if (result == -1 && (errno == EPERM || errno == ENOTSUP)
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&& !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
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{
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ULONG ulMode;
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switch (action)
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{
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case F_DUPFD:
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/* Find available fd */
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while (fcntl (arg, F_GETFL) != -1 || errno != EBADF)
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arg++;
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result = dup2 (fd, arg);
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break;
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/* Using underlying APIs is right ? */
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case F_GETFD:
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if (DosQueryFHState (fd, &ulMode))
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break;
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result = (ulMode & OPEN_FLAGS_NOINHERIT) ? FD_CLOEXEC : 0;
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break;
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case F_SETFD:
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if (arg & ~FD_CLOEXEC)
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break;
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if (DosQueryFHState (fd, &ulMode))
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break;
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if (arg & FD_CLOEXEC)
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ulMode |= OPEN_FLAGS_NOINHERIT;
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else
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ulMode &= ~OPEN_FLAGS_NOINHERIT;
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/* Filter supported flags. */
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ulMode &= (OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR
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| OPEN_FLAGS_NO_CACHE | OPEN_FLAGS_NOINHERIT);
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if (DosSetFHState (fd, ulMode))
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break;
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result = 0;
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break;
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case F_GETFL:
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result = 0;
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break;
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case F_SETFL:
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if (arg != 0)
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break;
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result = 0;
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break;
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default :
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errno = EINVAL;
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break;
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}
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}
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va_end (arg_ptr);
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return result;
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}
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# define fcntl klibc_fcntl
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#endif
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/* Perform the specified ACTION on the file descriptor FD, possibly
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using the argument ARG further described below. This replacement
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handles the following actions, and forwards all others on to the
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native fcntl. An unrecognized ACTION returns -1 with errno set to
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EINVAL.
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F_DUPFD - duplicate FD, with int ARG being the minimum target fd.
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If successful, return the duplicate, which will be inheritable;
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otherwise return -1 and set errno.
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F_DUPFD_CLOEXEC - duplicate FD, with int ARG being the minimum
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target fd. If successful, return the duplicate, which will not be
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inheritable; otherwise return -1 and set errno.
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F_GETFD - ARG need not be present. If successful, return a
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non-negative value containing the descriptor flags of FD (only
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FD_CLOEXEC is portable, but other flags may be present); otherwise
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return -1 and set errno. */
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int
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rpl_fcntl (int fd, int action, /* arg */...)
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{
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va_list arg;
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int result = -1;
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va_start (arg, action);
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switch (action)
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{
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#if !HAVE_FCNTL
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case F_DUPFD:
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{
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int target = va_arg (arg, int);
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result = dupfd (fd, target, 0);
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break;
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}
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#elif FCNTL_DUPFD_BUGGY || REPLACE_FCHDIR
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case F_DUPFD:
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{
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int target = va_arg (arg, int);
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/* Detect invalid target; needed for cygwin 1.5.x. */
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if (target < 0 || getdtablesize () <= target)
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errno = EINVAL;
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else
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{
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/* Haiku alpha 2 loses fd flags on original. */
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int flags = fcntl (fd, F_GETFD);
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if (flags < 0)
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{
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result = -1;
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break;
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}
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result = fcntl (fd, action, target);
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if (0 <= result && fcntl (fd, F_SETFD, flags) == -1)
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{
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int saved_errno = errno;
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close (result);
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result = -1;
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errno = saved_errno;
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}
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# if REPLACE_FCHDIR
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if (0 <= result)
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result = _gl_register_dup (fd, result);
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# endif
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}
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break;
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} /* F_DUPFD */
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#endif /* FCNTL_DUPFD_BUGGY || REPLACE_FCHDIR */
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case F_DUPFD_CLOEXEC:
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{
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int target = va_arg (arg, int);
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#if !HAVE_FCNTL
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result = dupfd (fd, target, O_CLOEXEC);
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break;
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#else /* HAVE_FCNTL */
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/* Try the system call first, if the headers claim it exists
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(that is, if GNULIB_defined_F_DUPFD_CLOEXEC is 0), since we
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may be running with a glibc that has the macro but with an
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older kernel that does not support it. Cache the
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information on whether the system call really works, but
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avoid caching failure if the corresponding F_DUPFD fails
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for any reason. 0 = unknown, 1 = yes, -1 = no. */
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static int have_dupfd_cloexec = GNULIB_defined_F_DUPFD_CLOEXEC ? -1 : 0;
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if (0 <= have_dupfd_cloexec)
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{
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result = fcntl (fd, action, target);
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if (0 <= result || errno != EINVAL)
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{
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have_dupfd_cloexec = 1;
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# if REPLACE_FCHDIR
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if (0 <= result)
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result = _gl_register_dup (fd, result);
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# endif
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}
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else
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{
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result = rpl_fcntl (fd, F_DUPFD, target);
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if (result < 0)
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break;
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have_dupfd_cloexec = -1;
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}
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}
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else
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result = rpl_fcntl (fd, F_DUPFD, target);
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if (0 <= result && have_dupfd_cloexec == -1)
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{
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int flags = fcntl (result, F_GETFD);
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if (flags < 0 || fcntl (result, F_SETFD, flags | FD_CLOEXEC) == -1)
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{
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int saved_errno = errno;
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close (result);
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errno = saved_errno;
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result = -1;
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}
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}
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break;
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#endif /* HAVE_FCNTL */
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} /* F_DUPFD_CLOEXEC */
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#if !HAVE_FCNTL
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case F_GETFD:
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{
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# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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HANDLE handle = (HANDLE) _get_osfhandle (fd);
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DWORD flags;
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if (handle == INVALID_HANDLE_VALUE
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|| GetHandleInformation (handle, &flags) == 0)
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errno = EBADF;
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else
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result = (flags & HANDLE_FLAG_INHERIT) ? 0 : FD_CLOEXEC;
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# else /* !W32 */
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/* Use dup2 to reject invalid file descriptors. No way to
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access this information, so punt. */
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if (0 <= dup2 (fd, fd))
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result = 0;
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# endif /* !W32 */
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break;
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} /* F_GETFD */
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|
#endif /* !HAVE_FCNTL */
|
|
|
|
/* Implementing F_SETFD on mingw is not trivial - there is no
|
|
API for changing the O_NOINHERIT bit on an fd, and merely
|
|
changing the HANDLE_FLAG_INHERIT bit on the underlying handle
|
|
can lead to odd state. It may be possible by duplicating the
|
|
handle, using _open_osfhandle with the right flags, then
|
|
using dup2 to move the duplicate onto the original, but that
|
|
is not supported for now. */
|
|
|
|
default:
|
|
{
|
|
#if HAVE_FCNTL
|
|
void *p = va_arg (arg, void *);
|
|
result = fcntl (fd, action, p);
|
|
#else
|
|
errno = EINVAL;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
va_end (arg);
|
|
return result;
|
|
}
|