e70fdfb99f
(pipe2): Export. * dtable.cc (dtable::dup_worker): Take additional flags parameter. Handle O_CLOEXEC flag. (dtable::dup3): Rename from dup2. Take additional flags parameter. Check for valid flags. Drop check for newfd == oldfd. * dtable.h (dtable::dup_worker): Add flags parameter. (dtable::dup3): Rename from dup2. * fcntl.cc (fcntl64): Add F_DUPFD_CLOEXEC case. * fhandler.h (fhandler_mailslot::get_object_attr): Add flags parameter. * fhandler.cc (fhandler_base::open): Use security attribute with inheritance according to setting of O_CLOEXEC flag. * fhandler_console.cc (fhandler_console::open): Ditto. * fhandler_fifo.cc (sec_user_cloexec): New inline function to create security attribute with inheritance according to setting of O_CLOEXEC flag. (fhandler_fifo::open): Call sec_user_cloexec to fetch security attribute. (fhandler_fifo::wait): Ditto. * fhandler_mem.cc (fhandler_dev_mem::open): Ditto. * fhandler_mailslot.cc (fhandler_mailslot::get_object_attr): Take additional flags parameter. Use security attribute with inheritance according to setting of O_CLOEXEC flag. (fhandler_mailslot::open): Call get_object_attr with flags parameter. * fhandler_registry.cc (fhandler_registry::open): Call set_close_on_exec on real handles to accommodate O_CLOEXEC flag. * fhandler_tty.cc (fhandler_tty_slave::open): Ditto. * fhandler_tape.cc: Create mutex with inheritance according to setting of O_CLOEXEC flag. * pipe.cc: Replace usage of O_NOINHERIT with O_CLOEXEC. (fhandler_pipe::init): Simplify setting close_on_exec flag. (fhandler_pipe::open): Remove setting close_on_exec flag. (fhandler_pipe::create): Use security attribute with inheritance according to setting of O_CLOEXEC flag. (pipe2): New exported function. * posix_ipc.cc: Throughout, open backing files with O_CLOEXEC flag to follow POSIX semantics. * security.h (sec_none_cloexec): New define. * syscalls.cc (dup): Add missing extern "C" qualifier. Accommodate renaming of dtable::dup2 to dtable::dup3. (dup2): Ditto. Check newfd == oldfd here. (dup3): New function. Check newfd == oldfd here. (open): Set close_on_exec flag according to O_CLOEXEC flag before calling fhandler->open. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
/* dtable.h: fd table definition.
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Copyright 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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2010 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* Initial and increment values for cygwin's fd table */
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#define NOFILE_INCR 32
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/* Maximum size we allow expanding to. */
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#define OPEN_MAX_MAX (100 * NOFILE_INCR)
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#include "thread.h"
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#include "sync.h"
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class suffix_info;
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#define BFH_OPTS (PC_NULLEMPTY | PC_FULL | PC_POSIX)
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class dtable
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{
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fhandler_base **fds;
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#ifdef NEWVFORK
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fhandler_base **fds_on_hold;
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#endif
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fhandler_base **archetypes;
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unsigned narchetypes;
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unsigned farchetype;
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static const int initial_archetype_size = 8;
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int first_fd_for_open;
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int cnt_need_fixup_before;
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void lock () {lock_process::locker.acquire ();}
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void unlock () {lock_process::locker.release ();}
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public:
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size_t size;
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dtable () : archetypes (NULL), narchetypes (0), farchetype (0), first_fd_for_open(3), cnt_need_fixup_before(0) {}
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void init () {first_fd_for_open = 3;}
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void dec_need_fixup_before ()
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{ if (cnt_need_fixup_before > 0) --cnt_need_fixup_before; }
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void inc_need_fixup_before ()
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{ cnt_need_fixup_before++; }
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bool need_fixup_before ()
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{ return cnt_need_fixup_before > 0; }
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void move_fd (int, int);
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int vfork_child_dup ();
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void vfork_parent_restore ();
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void vfork_child_fixup ();
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fhandler_base *dup_worker (fhandler_base *oldfh, int flags);
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int extend (int howmuch);
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void fixup_after_fork (HANDLE);
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inline int not_open (int fd)
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{
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lock ();
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int res = fd < 0 || fd >= (int) size || fds[fd] == NULL;
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unlock ();
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return res;
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}
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int find_unused_handle (int start);
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int find_unused_handle () { return find_unused_handle (first_fd_for_open);}
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void release (int fd);
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void init_std_file_from_handle (int fd, HANDLE handle);
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int dup3 (int oldfd, int newfd, int flags);
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void fixup_after_exec ();
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inline fhandler_base *&operator [](int fd) const { return fds[fd]; }
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bool select_read (int fd, select_stuff *);
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bool select_write (int fd, select_stuff *);
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bool select_except (int fd, select_stuff *);
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operator fhandler_base **() {return fds;}
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void stdio_init ();
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void get_debugger_info ();
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void set_file_pointers_for_exec ();
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#ifdef NEWVFORK
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bool in_vfork_cleanup () {return fds_on_hold == fds;}
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#endif
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fhandler_base *find_archetype (device& dev);
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fhandler_base **add_archetype ();
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void delete_archetype (fhandler_base *);
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void fixup_before_exec (DWORD win_proc_id);
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void fixup_before_fork (DWORD win_proc_id);
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friend void dtable_init ();
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friend void __stdcall close_all_files (bool);
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friend class fhandler_disk_file;
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friend class cygheap_fdmanip;
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friend class cygheap_fdget;
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friend class cygheap_fdnew;
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friend class cygheap_fdenum;
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friend class lock_process;
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};
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fhandler_base *build_fh_dev (const device&, const char * = NULL);
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fhandler_base *build_fh_name (const char *, unsigned = 0, suffix_info * = NULL);
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fhandler_base *build_fh_pc (path_conv& pc, bool set_name = true);
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void dtable_init ();
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void stdio_init ();
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extern dtable fdtab;
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extern "C" int getfdtabsize ();
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extern "C" void setfdtabsize (int);
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