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In preparation to protect fork() against dll- and exe-updates, create hardlinks to the main executable and each loaded dll in subdirectories of /var/run/cygfork/, if that one exists on the NTFS file system. The directory names consist of the user sid, the main executable's NTFS IndexNumber, and the most recent LastWriteTime of all involved binaries (dlls and main executable). Next to the main.exe hardlink we create the empty file main.exe.local to enable dll redirection. The name of the mutex to synchronize hardlink creation/cleanup also is assembled from these directory names, to allow for synchronized cleanup of even orphaned hardlink directories. The hardlink to each dynamically loaded dll goes into another directory, named using the NTFS IndexNumber of the dll's original directory. * Makefile.in (DLL_OFILES): Add forkable.o. * dll_init.h (struct dll): Declare member variables fbi, fii, forkable_ntname. Declare methods nominate_forkable, create_forkable. (struct dll_list): Declare enum forkables_needs. Declare member variables forkables_dirx_size, forkables_dirx_ntname, forkables_mutex_name, forkables_mutex. Declare private methods forkable_ntnamesize, prepare_forkables_nomination, update_forkables_needs, update_forkables, create_forkables, denominate_forkables, close_mutex, try_remove_forkables, set_forkables_inheritance, request_forkables. Declare public static methods ntopenfile, read_fii, read_fbi. Declare public methods release_forkables, cleanup_forkables. Define public inline method setup_forkables. * dll_init.cc (dll_list::alloc): Allocate memory to hold the name of the hardlink in struct dll member forkable_ntname. Initialize struct dll members fbi, fii. (dll_list::load_after_fork): Call release_forkables method. * fork.cc: Rename public fork function to static dofork, add with_forkables as bool pointer parameter. Add new fork function calling dofork. (struct frok): Add bool pointer member with_forkables, add as constructor parameter. (frok::parent): Call dlls.setup_forkables before CreateProcessW, dlls.release_forkables afterwards. * pinfo.cc (pinfo::exit): Call dlls.cleanup_forkables. * syscalls.cc (_unlink_nt): Rename public unlink_nt function to static _unlink_nt, with 'shareable' as additional argument. (unlink_nt): New, wrap _unlink_nt for original behaviour. (unlink_nt_shareable): New, wrap _unlink_nt to keep a binary file still loadable while removing one of its hardlinks. * forkable.cc: New file. Implement static functions mkdirs, rmdirs, rmdirs_synchronized, stat_real_file_once, format_IndexNumber, rootname, sidname, exename, lwtimename. Define static array forkable_nameparts. (struct dll): Implement nominate_forkable, create_forkable. (struct dll_list): Implement static methods ntopenfile, read_fii, read_fbi. Implement forkable_ntnamesize,
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.