* child_info.h (CURR_CHILD_INFO_MAGIC): Reset.
(child_info::rd_proc_pipe): Declare new field. (child_info::wr_proc_pipe): Ditto. (child_info::prefork): Declare new function, derived from previous pinfo version. * dcrt0.cc (child_info_fork::handle_fork): Close previous wr_proc_pipe when appropriate and assign new one from passed-in child_info block. (child_info_spawn::handle_spawn): Assign our wr_proc_pipe handle from passed-in child_info block. * fork.cc (child_info::prefork): Define new function. (frok::child): Clear rd_proc_pipe and wr_proc_pipe so they will not be closed by the child_info destructor. (frok::parent): Use child_info prefork handling, outside of retry loop. Set rd_proc_pipe in child's pinfo after successful CreateProcess. Eliminate postfork call. * globals.cc (my_wr_proc_pipe): Define/declare new variable. * pinfo.cc (pinfo::pending_rd_proc_pipe): Delete. (pinfo::pending_wr_proc_pipe): Ditto. (pinfo::prefork): Ditto. (pinfo::postfork): Ditto. (pinfo::postexec): Ditto. (pinfo::wait): Assume that rd_proc_pipe is set up correctly prior to call. (_pinfo::alert_parent): Replace "wr_proc_pipe" with "my_wr_proc_pipe". * pinfo.h (_pinfo::_wr_proc_pipe): Delete declaration. (_pinfo::set_rd_proc_pipe): Define new function. (pinfo::pending_rd_proc_pipe): Delete declaration. (pinfo::pending_wr_proc_pipe): Ditto. (pinfo::prefork): Ditto. (pinfo::postfork): Ditto. (pinfo::postexec): Ditto. (pinfo::wr_proc_pipe): Ditto. * sigproc.cc (child_info::child_info): Clear rd_proc_pipe and wr_proc_pipe. (child_info::cleanup): Close rd_proc_pipe and wr_proc_pipe if necessary. (child_info_fork::child_info_fork): Set forker_finished to NULL by default. (child_info_spawn::child_info_spawn): Use my_wr_proc_pipe rather than myself->wr_proc_pipe. (child_info::sync): Ditto. (child_info_spawn::cleanup): Call child_info::cleanup. * spawn.cc (child_info_spawn::worker): Remove call to myself.prefork(). Set wr_proc_pipe when execing or set up new rd_proc_pipe/wr_proc_pipe via child_info::prefork when spawning. Remove call to pinfo::postexec. Set rd_proc_pipe in child pinfo when spawning. Use my_wr_proc_pipe rather than myself->wr_proc_pipe. Remove call to postfork.
This commit is contained in:
Christopher Faylor
parent
e9a6f9c625
commit
1fb6667f1c
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@ -1,3 +1,53 @@
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2012-03-20 Christopher Faylor <me.cygwin2012@cgf.cx>
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* child_info.h (CURR_CHILD_INFO_MAGIC): Reset.
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(child_info::rd_proc_pipe): Declare new field.
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(child_info::wr_proc_pipe): Ditto.
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(child_info::prefork): Declare new function, derived from previous
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pinfo version.
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* dcrt0.cc (child_info_fork::handle_fork): Close previous wr_proc_pipe
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when appropriate and assign new one from passed-in child_info block.
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(child_info_spawn::handle_spawn): Assign our wr_proc_pipe handle from
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passed-in child_info block.
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* fork.cc (child_info::prefork): Define new function.
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(frok::child): Clear rd_proc_pipe and wr_proc_pipe so they will not be
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closed by the child_info destructor.
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(frok::parent): Use child_info prefork handling, outside of retry loop.
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Set rd_proc_pipe in child's pinfo after successful CreateProcess.
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Eliminate postfork call.
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* globals.cc (my_wr_proc_pipe): Define/declare new variable.
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* pinfo.cc (pinfo::pending_rd_proc_pipe): Delete.
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(pinfo::pending_wr_proc_pipe): Ditto.
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(pinfo::prefork): Ditto.
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(pinfo::postfork): Ditto.
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(pinfo::postexec): Ditto.
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(pinfo::wait): Assume that rd_proc_pipe is set up correctly prior to
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call.
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(_pinfo::alert_parent): Replace "wr_proc_pipe" with "my_wr_proc_pipe".
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* pinfo.h (_pinfo::_wr_proc_pipe): Delete declaration.
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(_pinfo::set_rd_proc_pipe): Define new function.
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(pinfo::pending_rd_proc_pipe): Delete declaration.
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(pinfo::pending_wr_proc_pipe): Ditto.
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(pinfo::prefork): Ditto.
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(pinfo::postfork): Ditto.
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(pinfo::postexec): Ditto.
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(pinfo::wr_proc_pipe): Ditto.
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* sigproc.cc (child_info::child_info): Clear rd_proc_pipe and
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wr_proc_pipe.
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(child_info::cleanup): Close rd_proc_pipe and
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wr_proc_pipe if necessary.
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(child_info_fork::child_info_fork): Set forker_finished to NULL by
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default.
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(child_info_spawn::child_info_spawn): Use my_wr_proc_pipe rather than
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myself->wr_proc_pipe.
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(child_info::sync): Ditto.
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(child_info_spawn::cleanup): Call child_info::cleanup.
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* spawn.cc (child_info_spawn::worker): Remove call to myself.prefork().
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Set wr_proc_pipe when execing or set up new rd_proc_pipe/wr_proc_pipe
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via child_info::prefork when spawning. Remove call to pinfo::postexec.
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Set rd_proc_pipe in child pinfo when spawning. Use my_wr_proc_pipe
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rather than myself->wr_proc_pipe. Remove call to postfork.
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2012-03-19 Christopher Faylor <me.cygwin2012@cgf.cx>
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* pinfo.cc (pinfo_init): Cosmetic change: unset "destroy" for myself.
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@ -35,7 +35,7 @@ enum child_status
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#define EXEC_MAGIC_SIZE sizeof(child_info)
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/* Change this value if you get a message indicating that it is out-of-sync. */
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#define CURR_CHILD_INFO_MAGIC 0x76041b78U
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#define CURR_CHILD_INFO_MAGIC 0xa49e665eU
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#define NPROCS 256
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@ -61,6 +61,8 @@ public:
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void *cygheap_max;
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unsigned char flag;
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int retry; // number of times we've tried to start child process
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HANDLE rd_proc_pipe;
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HANDLE wr_proc_pipe;
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HANDLE subproc_ready; // used for synchronization with parent
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HANDLE user_h;
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HANDLE parent;
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@ -78,6 +80,8 @@ public:
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bool isstraced () const {return !!(flag & _CI_STRACED);}
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bool iscygwin () const {return !!(flag & _CI_ISCYGWIN);}
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bool saw_ctrl_c () const {return !!(flag & _CI_SAW_CTRL_C);}
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void prefork (bool = false);
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void cleanup ();
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};
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class mount_info;
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@ -598,6 +598,17 @@ child_info_fork::handle_fork ()
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"user heap", cygheap->user_heap.base, cygheap->user_heap.ptr,
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NULL);
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/* If my_wr_proc_pipe != NULL then it's a leftover handle from a previously
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forked process. Close it now or suffer confusion with the parent of our
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parent. */
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if (my_wr_proc_pipe)
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ForceCloseHandle1 (my_wr_proc_pipe, wr_proc_pipe);
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/* Setup our write end of the process pipe. Clear the one in the structure.
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The destructor should never be called for this but, it can't hurt to be
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safe. */
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my_wr_proc_pipe = wr_proc_pipe;
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rd_proc_pipe = wr_proc_pipe = NULL;
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/* Do the relocations here. These will actually likely be overwritten by the
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below child_copy but we do them here in case there is a read-only section
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which does not get copied by fork. */
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@ -626,6 +637,13 @@ child_info_spawn::handle_spawn ()
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GetCurrentProcess (), &h, 0,
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FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
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h = NULL;
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/* Setup our write end of the process pipe. Clear the one in the structure.
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The destructor should never be called for this but, it can't hurt to be
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safe. */
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my_wr_proc_pipe = wr_proc_pipe;
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rd_proc_pipe = wr_proc_pipe = NULL;
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myself.thisproc (h);
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__argc = moreinfo->argc;
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__argv = moreinfo->argv;
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@ -109,6 +109,25 @@ frok::error (const char *fmt, ...)
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return true;
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}
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/* Set up a pipe which will track the life of a "pid" through
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even after we've exec'ed. */
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void
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child_info::prefork (bool detached)
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{
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if (!detached)
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{
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if (!CreatePipe (&rd_proc_pipe, &wr_proc_pipe, &sec_none_nih, 16))
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api_fatal ("prefork: couldn't create pipe process tracker%E");
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if (!SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT,
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HANDLE_FLAG_INHERIT))
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api_fatal ("prefork: couldn't set process pipe(%p) inherit state, %E",
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wr_proc_pipe);
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ProtectHandle1 (rd_proc_pipe, rd_proc_pipe);
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ProtectHandle1 (wr_proc_pipe, wr_proc_pipe);
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}
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}
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int __stdcall
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frok::child (volatile char * volatile here)
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{
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@ -194,6 +213,10 @@ frok::child (volatile char * volatile here)
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ld_preload ();
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fixup_hooks_after_fork ();
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_my_tls.fixup_after_fork ();
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/* Clear this or the destructor will close them. In the case of
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rd_proc_pipe that would be an invalid handle. In the case of
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wr_proc_pipe it would be == my_wr_proc_pipe. Both would be bad. */
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ch.rd_proc_pipe = ch.wr_proc_pipe = NULL;
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cygwin_finished_initializing = true;
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return 0;
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}
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@ -326,11 +349,11 @@ frok::parent (volatile char * volatile stack_here)
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cygheap->user.deimpersonate ();
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fix_impersonation = true;
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ch.refresh_cygheap ();
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ch.prefork (); /* set up process tracking pipes. */
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while (1)
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{
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hchild = NULL;
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myself.prefork ();
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rc = CreateProcessW (myself->progname, /* image to run */
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myself->progname, /* what we send in arg0 */
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&sec_none_nih,
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@ -403,6 +426,7 @@ frok::parent (volatile char * volatile stack_here)
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/* Fill in fields in the child's process table entry. */
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child->dwProcessId = pi.dwProcessId;
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child.hProcess = hchild;
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child.set_rd_proc_pipe (ch.rd_proc_pipe);
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/* Hopefully, this will succeed. The alternative to doing things this
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way is to reserve space prior to calling CreateProcess and then fill
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@ -516,7 +540,6 @@ frok::parent (volatile char * volatile stack_here)
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/* Common cleanup code for failure cases */
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cleanup:
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myself.postfork ();
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if (fix_impersonation)
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cygheap->user.reimpersonate ();
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if (locked)
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@ -21,6 +21,7 @@ details. */
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HANDLE NO_COPY hMainThread;
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HANDLE NO_COPY hProcToken;
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HANDLE NO_COPY hProcImpToken;
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HANDLE my_wr_proc_pipe;
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HMODULE NO_COPY cygwin_hmodule;
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int NO_COPY sigExeced;
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WCHAR windows_system_directory[MAX_PATH];
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@ -49,9 +49,6 @@ pinfo_basic myself_initial NO_COPY;
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pinfo NO_COPY myself (static_cast<_pinfo *> (&myself_initial)); // Avoid myself != NULL checks
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HANDLE NO_COPY pinfo::pending_rd_proc_pipe;
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HANDLE NO_COPY pinfo::pending_wr_proc_pipe;
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bool is_toplevel_proc;
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/* Setup the pinfo structure for this process. There may already be a
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@ -989,22 +986,6 @@ debug_printf ("%d exited buf %d\n", vchild->pid, buf);
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bool
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pinfo::wait ()
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{
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/* If pending_rd_proc_pipe == NULL we're in an execed process which has
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already grabbed the read end of the pipe from the previous cygwin process
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running with this pid. */
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if (pending_rd_proc_pipe)
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{
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/* Our end of the pipe, previously set in prefork() . */
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rd_proc_pipe = pending_rd_proc_pipe;
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pending_rd_proc_pipe = NULL;
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/* This sets wr_proc_pipe in the child which, after the following
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ForceCloseHandle1, will be only process with the handle open. */
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wr_proc_pipe () = pending_wr_proc_pipe;
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ForceCloseHandle1 (pending_wr_proc_pipe, wr_proc_pipe);
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pending_wr_proc_pipe = NULL;
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}
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preserve (); /* Preserve the shared memory associated with the pinfo */
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waiter_ready = false;
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@ -1022,54 +1003,6 @@ pinfo::wait ()
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return true;
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}
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void
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pinfo::prefork (bool detached)
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{
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if (wr_proc_pipe () && wr_proc_pipe () != INVALID_HANDLE_VALUE
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&& !SetHandleInformation (wr_proc_pipe (), HANDLE_FLAG_INHERIT, 0))
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api_fatal ("couldn't set process pipe(%p) inherit state, %E", wr_proc_pipe ());
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if (!detached)
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{
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if (!CreatePipe (&pending_rd_proc_pipe, &pending_wr_proc_pipe,
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&sec_none_nih, 16))
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api_fatal ("Couldn't create pipe tracker for pid %d, %E", (*this)->pid);
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if (!SetHandleInformation (pending_wr_proc_pipe, HANDLE_FLAG_INHERIT,
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HANDLE_FLAG_INHERIT))
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api_fatal ("prefork: couldn't set process pipe(%p) inherit state, %E",
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pending_wr_proc_pipe);
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ProtectHandle1 (pending_rd_proc_pipe, rd_proc_pipe);
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ProtectHandle1 (pending_wr_proc_pipe, wr_proc_pipe);
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}
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}
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void
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pinfo::postfork ()
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{
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if (wr_proc_pipe () && wr_proc_pipe () != INVALID_HANDLE_VALUE
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&& !SetHandleInformation (wr_proc_pipe (), HANDLE_FLAG_INHERIT,
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HANDLE_FLAG_INHERIT))
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api_fatal ("postfork: couldn't set process pipe(%p) inherit state, %E", wr_proc_pipe ());
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if (pending_rd_proc_pipe)
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{
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ForceCloseHandle1 (pending_rd_proc_pipe, rd_proc_pipe);
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pending_rd_proc_pipe = NULL;
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}
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if (pending_wr_proc_pipe)
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{
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ForceCloseHandle1 (pending_wr_proc_pipe, wr_proc_pipe);
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pending_wr_proc_pipe = NULL;
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}
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}
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void
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pinfo::postexec ()
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{
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if (wr_proc_pipe () && wr_proc_pipe () != INVALID_HANDLE_VALUE
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&& !ForceCloseHandle1 (wr_proc_pipe (), wr_proc_pipe))
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api_fatal ("postexec: couldn't close wr_proc_pipe(%p), %E", wr_proc_pipe ());
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}
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/* function to send a "signal" to the parent when something interesting happens
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in the child. */
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bool
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@ -1082,19 +1015,17 @@ _pinfo::alert_parent (char sig)
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FIXME: Is there a race here if we run this while another thread is attempting
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to exec()? */
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if (wr_proc_pipe == INVALID_HANDLE_VALUE || !myself.wr_proc_pipe () || have_execed)
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/* no parent */;
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else
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if (my_wr_proc_pipe)
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{
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if (WriteFile (wr_proc_pipe, &sig, 1, &nb, NULL))
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if (WriteFile (my_wr_proc_pipe, &sig, 1, &nb, NULL))
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/* all is well */;
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else if (GetLastError () != ERROR_BROKEN_PIPE)
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debug_printf ("sending %d notification to parent failed, %E", sig);
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else
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{
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ppid = 1;
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HANDLE closeit = wr_proc_pipe;
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wr_proc_pipe = INVALID_HANDLE_VALUE;
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HANDLE closeit = my_wr_proc_pipe;
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my_wr_proc_pipe = NULL;
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ForceCloseHandle1 (closeit, wr_proc_pipe);
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}
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}
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@ -121,7 +121,6 @@ public:
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HANDLE exec_sendsig;
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DWORD exec_dwProcessId;
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public:
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HANDLE wr_proc_pipe;
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friend class pinfo_minimal;
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};
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@ -140,6 +139,7 @@ public:
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HANDLE hProcess;
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HANDLE rd_proc_pipe;
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pinfo_minimal (): h (NULL), hProcess (NULL), rd_proc_pipe (NULL) {}
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void set_rd_proc_pipe (HANDLE& h) {rd_proc_pipe = h; h = NULL;}
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friend class pinfo;
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};
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@ -147,8 +147,6 @@ class pinfo: public pinfo_minimal
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{
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bool destroy;
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_pinfo *procinfo;
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static HANDLE pending_rd_proc_pipe;
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static HANDLE pending_wr_proc_pipe;
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public:
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bool waiter_ready;
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class cygthread *wait_thread;
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@ -204,15 +202,10 @@ public:
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return res;
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}
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#endif
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void prefork (bool = false);
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void postfork ();
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void postexec ();
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HANDLE shared_handle () {return h;}
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void set_acl ();
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friend class _pinfo;
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friend class winpids;
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private:
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HANDLE& wr_proc_pipe() {return procinfo->wr_proc_pipe;}
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};
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#define ISSTATE(p, f) (!!((p)->process_state & f))
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|
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|
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@ -828,7 +828,8 @@ child_info::child_info (unsigned in_cb, child_info_types chtype,
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bool need_subproc_ready):
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cb (in_cb), intro (PROC_MAGIC_GENERIC), magic (CHILD_INFO_MAGIC),
|
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type (chtype), cygheap (::cygheap), cygheap_max (::cygheap_max),
|
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flag (0), retry (child_info::retry_count)
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flag (0), retry (child_info::retry_count), rd_proc_pipe (NULL),
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wr_proc_pipe (NULL)
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{
|
||||
/* It appears that when running under WOW64 on Vista 64, the first DWORD
|
||||
value in the datastructure lpReserved2 is pointing to (msv_count in
|
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|
|
@ -876,14 +877,12 @@ child_info::child_info (unsigned in_cb, child_info_types chtype,
|
|||
|
||||
child_info::~child_info ()
|
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{
|
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if (subproc_ready)
|
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CloseHandle (subproc_ready);
|
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if (parent)
|
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CloseHandle (parent);
|
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cleanup ();
|
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}
|
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child_info_fork::child_info_fork () :
|
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child_info (sizeof *this, _CH_FORK, true)
|
||||
child_info (sizeof *this, _CH_FORK, true),
|
||||
forker_finished (NULL)
|
||||
{
|
||||
}
|
||||
|
||||
|
|
@ -893,7 +892,7 @@ child_info_spawn::child_info_spawn (child_info_types chtype, bool need_subproc_r
|
|||
if (type == _CH_EXEC)
|
||||
{
|
||||
hExeced = NULL;
|
||||
if (myself->wr_proc_pipe)
|
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if (my_wr_proc_pipe)
|
||||
ev = NULL;
|
||||
else if (!(ev = CreateEvent (&sec_none_nih, false, false, NULL)))
|
||||
api_fatal ("couldn't create signalling event for exec, %E");
|
||||
|
|
@ -912,6 +911,31 @@ cygheap_exec_info::alloc ()
|
|||
+ (nprocs * sizeof (children[0])));
|
||||
}
|
||||
|
||||
void
|
||||
child_info::cleanup ()
|
||||
{
|
||||
if (subproc_ready)
|
||||
{
|
||||
CloseHandle (subproc_ready);
|
||||
subproc_ready = NULL;
|
||||
}
|
||||
if (parent)
|
||||
{
|
||||
CloseHandle (parent);
|
||||
parent = NULL;
|
||||
}
|
||||
if (rd_proc_pipe)
|
||||
{
|
||||
ForceCloseHandle (rd_proc_pipe);
|
||||
rd_proc_pipe = NULL;
|
||||
}
|
||||
if (wr_proc_pipe)
|
||||
{
|
||||
ForceCloseHandle (wr_proc_pipe);
|
||||
wr_proc_pipe = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
child_info_spawn::cleanup ()
|
||||
{
|
||||
|
|
@ -940,6 +964,7 @@ child_info_spawn::cleanup ()
|
|||
sync_proc_subproc.release ();
|
||||
}
|
||||
type = _CH_NADA;
|
||||
child_info::cleanup ();
|
||||
}
|
||||
|
||||
/* Record any non-reaped subprocesses to be passed to about-to-be-execed
|
||||
|
|
@ -1047,7 +1072,7 @@ child_info::sync (pid_t pid, HANDLE& hProcess, DWORD howlong)
|
|||
{
|
||||
res = true;
|
||||
exit_code = STILL_ACTIVE;
|
||||
if (type == _CH_EXEC && myself->wr_proc_pipe)
|
||||
if (type == _CH_EXEC && my_wr_proc_pipe)
|
||||
{
|
||||
ForceCloseHandle1 (hProcess, childhProc);
|
||||
hProcess = NULL;
|
||||
|
|
|
|||
|
|
@ -352,10 +352,7 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
|
|||
if (mode == _P_OVERLAY)
|
||||
chtype = _CH_EXEC;
|
||||
else
|
||||
{
|
||||
chtype = _CH_SPAWN;
|
||||
myself.prefork ();
|
||||
}
|
||||
|
||||
moreinfo = cygheap_exec_info::alloc ();
|
||||
|
||||
|
|
@ -616,6 +613,12 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
|
|||
&& fhandler_console::tc_getpgid () != myself->pgid)
|
||||
c_flags |= CREATE_NEW_PROCESS_GROUP;
|
||||
refresh_cygheap ();
|
||||
|
||||
if (chtype == _CH_EXEC)
|
||||
wr_proc_pipe = my_wr_proc_pipe;
|
||||
else
|
||||
prefork ();
|
||||
|
||||
/* When ruid != euid we create the new process under the current original
|
||||
account and impersonate in child, this way maintaining the different
|
||||
effective vs. real ids.
|
||||
|
|
@ -737,6 +740,8 @@ loop:
|
|||
myself->exec_sendsig = NULL;
|
||||
}
|
||||
myself->process_state &= ~PID_NOTCYGWIN;
|
||||
if (wr_proc_pipe == my_wr_proc_pipe)
|
||||
wr_proc_pipe = NULL; /* We still own it: don't nuke in destructor */
|
||||
res = -1;
|
||||
goto out;
|
||||
}
|
||||
|
|
@ -771,18 +776,6 @@ loop:
|
|||
myself.hProcess = hExeced = pi.hProcess;
|
||||
real_path.get_wide_win32_path (myself->progname); // FIXME: race?
|
||||
sigproc_printf ("new process name %W", myself->progname);
|
||||
/* If wr_proc_pipe doesn't exist then this process was not started by a cygwin
|
||||
process. So, we need to wait around until the process we've just "execed"
|
||||
dies. Use our own wait facility below to wait for our own pid to exit
|
||||
(there is some minor special case code in proc_waiter and friends to
|
||||
accommodate this).
|
||||
|
||||
If wr_proc_pipe exists, then it will be inherited by the child.
|
||||
If the child has exited already, that's ok. The parent will pick up
|
||||
on this fact when we exit. myself.postexec () will close our end of
|
||||
the pipe. */
|
||||
if (!newargv.win16_exe && myself->wr_proc_pipe)
|
||||
myself.postexec ();
|
||||
pid = myself->pid;
|
||||
if (!iscygwin ())
|
||||
close_all_files ();
|
||||
|
|
@ -801,6 +794,7 @@ loop:
|
|||
res = -1;
|
||||
goto out;
|
||||
}
|
||||
child.set_rd_proc_pipe (rd_proc_pipe);
|
||||
child->dwProcessId = pi.dwProcessId;
|
||||
child.hProcess = pi.hProcess;
|
||||
|
||||
|
|
@ -857,7 +851,7 @@ loop:
|
|||
else
|
||||
{
|
||||
close_all_files (true);
|
||||
if (!myself->wr_proc_pipe
|
||||
if (!my_wr_proc_pipe
|
||||
&& WaitForSingleObject (pi.hProcess, 0) == WAIT_TIMEOUT)
|
||||
{
|
||||
extern bool is_toplevel_proc;
|
||||
|
|
@ -887,8 +881,6 @@ loop:
|
|||
}
|
||||
|
||||
out:
|
||||
if (mode != _P_OVERLAY)
|
||||
myself.postfork ();
|
||||
this->cleanup ();
|
||||
if (envblock)
|
||||
free (envblock);
|
||||
|
|
|
|||
Loading…
Reference in New Issue