8dca9e2302
(vfork_save::restore_pid): New method.
(vfork_save::restore_exit): New method.
* fork.cc (vfork): Save ctty, sid, pgid and restore them when returning to
"parent". Use exitval field if exiting but never created a new process.
* syscalls.cc (setsid): Detect when in "vfork" and force an actual fork so that
pid will be allocated (UGLY!).
(getsid): New function.
* dcrt0.cc (do_exit): Use vfork_save::restore_exit method for returning from a
vfork.
* spawn.cc (spawnve): Use vfork_save::{restore_pid,restore_exit} methods for
returning from vfork.
* cygwin.din: Export getsid.
* include/cygwin/version.h: Bump api minor number.
* malloc.cc: #ifdef sYSTRIm for when MORECORE_CANNOT_TRIM is true.
114 lines
2.6 KiB
C++
114 lines
2.6 KiB
C++
/* perthread.h: Header file for cygwin synchronization primitives.
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Copyright 2000, 2001 Red Hat, Inc.
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Written by Christopher Faylor <cgf@cygnus.com>
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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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#define PTMAGIC 0x77366377
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struct _reent;
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extern struct _reent reent_data;
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#define PER_THREAD_FORK_CLEAR ((void *)0xffffffff)
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class per_thread
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{
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DWORD tls;
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int clear_on_fork_p;
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public:
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per_thread (int forkval = 1) {tls = TlsAlloc (); clear_on_fork_p = forkval;}
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DWORD get_tls () {return tls;}
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int clear_on_fork () {return clear_on_fork_p;}
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virtual void *get () {return TlsGetValue (get_tls ());}
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virtual size_t size () {return 0;}
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virtual void set (void *s = NULL);
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virtual void set (int n) {TlsSetValue (get_tls (), (void *)n);}
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virtual void *create ()
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{
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void *s = new char [size ()];
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memset (s, 0, size ());
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set (s);
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return s;
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}
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};
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class per_thread_waitq : public per_thread
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{
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public:
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per_thread_waitq () : per_thread (0) {}
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void *get () {return (waitq *) this->per_thread::get ();}
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void *create () {return (waitq *) this->per_thread::create ();}
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size_t size () {return sizeof (waitq);}
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};
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#if defined (NEED_VFORK)
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class vfork_save
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{
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jmp_buf j;
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int exitval;
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public:
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int pid;
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DWORD frame[100];
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char **vfork_ebp;
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char **vfork_esp;
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int ctty;
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pid_t sid;
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pid_t pgid;
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int is_active () { return pid < 0; }
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void restore_pid (int val)
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{
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pid = val;
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longjmp (j, 1);
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}
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void restore_exit (int val)
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{
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exitval = val;
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longjmp (j, 1);
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}
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friend int vfork ();
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};
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class per_thread_vfork : public per_thread
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{
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public:
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vfork_save *val () { return (vfork_save *) this->per_thread::get (); }
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vfork_save *create () {return (vfork_save *) this->per_thread::create ();}
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size_t size () {return sizeof (vfork_save);}
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};
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extern per_thread_vfork vfork_storage;
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extern vfork_save *main_vfork;
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#endif
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extern "C" {
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struct signal_dispatch
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{
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int arg;
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void (*func) (int);
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int sig;
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int saved_errno;
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int sa_flags;
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DWORD oldmask;
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DWORD newmask;
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DWORD retaddr;
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DWORD *retaddr_on_stack;
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};
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};
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struct per_thread_signal_dispatch : public per_thread
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{
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signal_dispatch *get () { return (signal_dispatch *) this->per_thread::get (); }
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signal_dispatch *create () {return (signal_dispatch *) this->per_thread::create ();}
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size_t size () {return sizeof (signal_dispatch);}
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};
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extern per_thread_waitq waitq_storage;
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extern per_thread_signal_dispatch signal_dispatch_storage;
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extern per_thread *threadstuff[];
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