1312 lines
37 KiB
C++
1312 lines
37 KiB
C++
/* sigproc.cc: inter/intra signal and sub process handler
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Copyright 1997, 1998, 1999, 2000, 2001, 2002 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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#include "winsup.h"
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#include <stdlib.h>
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#include <time.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/cygwin.h>
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#include <assert.h>
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#include "cygerrno.h"
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#include "sync.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "security.h"
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#include "fhandler.h"
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#include "path.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "child_info_magic.h"
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#define NEED_VFORK
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#include "perthread.h"
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#include "shared_info.h"
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#include "cygthread.h"
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/*
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* Convenience defines
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*/
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#define WSSC 60000 // Wait for signal completion
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#define WPSP 40000 // Wait for proc_subproc mutex
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#define WSPX 20000 // Wait for wait_sig to terminate
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#define WWSP 20000 // Wait for wait_subproc to terminate
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#define TOTSIGS (NSIG + __SIGOFFSET)
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#define wake_wait_subproc() SetEvent (events[0])
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#define no_signals_available() (!hwait_sig || !sig_loop_wait)
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#define NZOMBIES 256
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/*
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* Global variables
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*/
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const char *__sp_fn ;
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int __sp_ln;
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char NO_COPY myself_nowait_dummy[1] = {'0'};// Flag to sig_send that signal goes to
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// current process but no wait is required
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char NO_COPY myself_nowait_nonmain_dummy[1] = {'1'};// Flag to sig_send that signal goes to
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// current process but no wait is required
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// if this is not the main thread.
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HANDLE NO_COPY signal_arrived; // Event signaled when a signal has
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// resulted in a user-specified
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// function call
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/*
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* Common variables
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*/
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/* How long to wait for message/signals. Normally this is infinite.
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* On termination, however, these are set to zero as a flag to exit.
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*/
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#define Static static NO_COPY
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Static DWORD proc_loop_wait = 1000; // Wait for subprocesses to exit
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Static DWORD sig_loop_wait = INFINITE; // Wait for signals to arrive
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Static HANDLE sigcatch_nonmain; // The semaphore signaled when
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// signals are available for
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// processing from non-main thread
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Static HANDLE sigcatch_main; // Signalled when main thread sends a
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// signal
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Static HANDLE sigcatch_nosync; // Signal wait_sig to scan sigtodo
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// but not to bother with any
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// synchronization
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Static HANDLE sigcomplete_main; // Event signaled when a signal has
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// finished processing for the main
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// thread
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Static HANDLE sigcomplete_nonmain; // Semaphore raised for non-main
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// threads when a signal has finished
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// processing
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HANDLE NO_COPY sigCONT; // Used to "STOP" a process
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Static cygthread *hwait_sig; // Handle of wait_sig thread
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Static cygthread *hwait_subproc; // Handle of sig_subproc thread
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Static HANDLE wait_sig_inited; // Control synchronization of
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// message queue startup
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/* Used by WaitForMultipleObjects. These are handles to child processes.
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*/
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Static HANDLE events[PSIZE + 1]; // All my children's handles++
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#define hchildren (events + 1) // Where the children handles begin
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Static char cpchildren[PSIZE * sizeof (pinfo)]; // All my children info
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Static int nchildren; // Number of active children
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Static char czombies[(NZOMBIES + 1) * sizeof (pinfo)]; // All my deceased children info
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Static int nzombies; // Number of deceased children
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#define pchildren ((pinfo *) cpchildren)
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#define zombies ((pinfo *) czombies)
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Static waitq waitq_head = {0, 0, 0, 0, 0, 0, 0};// Start of queue for wait'ing threads
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Static waitq waitq_main; // Storage for main thread
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muto NO_COPY *sync_proc_subproc = NULL; // Control access to subproc stuff
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DWORD NO_COPY sigtid = 0; // ID of the signal thread
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int NO_COPY pending_signals = 0; // TRUE if signals pending
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/* Functions
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*/
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static int __stdcall checkstate (waitq *);
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static __inline__ BOOL get_proc_lock (DWORD, DWORD);
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static HANDLE __stdcall getsem (_pinfo *, const char *, int, int);
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static void __stdcall remove_zombie (int);
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static DWORD WINAPI wait_sig (VOID *arg);
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static int __stdcall stopped_or_terminated (waitq *, _pinfo *);
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static DWORD WINAPI wait_subproc (VOID *);
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/* Determine if the parent process is alive.
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*/
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BOOL __stdcall
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my_parent_is_alive ()
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{
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DWORD res;
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if (!myself->ppid_handle)
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{
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debug_printf ("No myself->ppid_handle");
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res = FALSE;
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}
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else
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for (int i = 0; i < 2; i++)
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switch (res = WaitForSingleObject (myself->ppid_handle, 0))
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{
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case WAIT_OBJECT_0:
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debug_printf ("parent dead.");
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res = FALSE;
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goto out;
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case WAIT_TIMEOUT:
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debug_printf ("parent still alive");
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res = TRUE;
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goto out;
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case WAIT_FAILED:
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DWORD werr = GetLastError ();
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if (werr == ERROR_INVALID_HANDLE && i == 0)
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continue;
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system_printf ("WFSO for myself->ppid_handle(%p) failed, error %d",
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myself->ppid_handle, werr);
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res = FALSE;
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goto out;
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}
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out:
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return res;
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}
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void __stdcall
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wait_for_sigthread ()
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{
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assert (wait_sig_inited);
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(void) WaitForSingleObject (wait_sig_inited, INFINITE);
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(void) ForceCloseHandle (wait_sig_inited);
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wait_sig_inited = NULL;
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}
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/* Get the sync_proc_subproc muto to control access to
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* children, zombie arrays.
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* Attempt to handle case where process is exiting as we try to grab
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* the mutex.
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*/
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static BOOL
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get_proc_lock (DWORD what, DWORD val)
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{
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Static int lastwhat = -1;
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if (!sync_proc_subproc)
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return FALSE;
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if (sync_proc_subproc->acquire (WPSP))
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{
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lastwhat = what;
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return TRUE;
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}
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if (!sync_proc_subproc)
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return FALSE;
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system_printf ("Couldn't aquire sync_proc_subproc for(%d,%d), %E, last %d",
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what, val, lastwhat);
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return TRUE;
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}
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static BOOL __stdcall
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proc_can_be_signalled (_pinfo *p)
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{
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if (p == myself_nowait || p == myself_nowait_nonmain || p == myself)
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{
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assert (!wait_sig_inited);
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return 1;
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}
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return ISSTATE (p, PID_INITIALIZING) ||
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(((p)->process_state & (PID_ACTIVE | PID_IN_USE)) ==
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(PID_ACTIVE | PID_IN_USE));
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}
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BOOL __stdcall
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pid_exists (pid_t pid)
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{
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pinfo p (pid);
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return proc_exists (p);
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}
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/* Test to determine if a process really exists and is processing signals.
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*/
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BOOL __stdcall
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proc_exists (_pinfo *p)
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{
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return p && !(p->process_state & PID_EXITED);
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}
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/* Return 1 if this is one of our children, zero otherwise.
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FIXME: This really should be integrated with the rest of the proc_subproc
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testing. Scanning these lists twice is inefficient. */
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int __stdcall
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mychild (int pid)
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{
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for (int i = 0; i < nchildren; i++)
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if (pchildren[i]->pid == pid)
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return 1;
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for (int i = 0; i < nzombies; i++)
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if (zombies[i]->pid == pid)
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return 1;
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return 0;
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}
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/* Handle all subprocess requests
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*/
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#define vchild (*((pinfo *) val))
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int __stdcall
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proc_subproc (DWORD what, DWORD val)
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{
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int rc = 1;
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int potential_match;
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_pinfo *child;
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int clearing;
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waitq *w;
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#define wval ((waitq *) val)
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sigproc_printf ("args: %x, %d", what, val);
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if (!get_proc_lock (what, val)) // Serialize access to this function
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{
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system_printf ("couldn't get proc lock. Something is wrong.");
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goto out1;
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}
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switch (what)
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{
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/* Add a new subprocess to the children arrays.
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* (usually called from the main thread)
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*/
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case PROC_ADDCHILD:
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if (nchildren >= PSIZE - 1)
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{
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rc = 0;
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break;
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}
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pchildren[nchildren] = vchild;
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hchildren[nchildren] = vchild->hProcess;
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if (!DuplicateHandle (hMainProc, vchild->hProcess, hMainProc, &vchild->pid_handle,
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0, 0, DUPLICATE_SAME_ACCESS))
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system_printf ("Couldn't duplicate child handle for pid %d, %E", vchild->pid);
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ProtectHandle1 (vchild->pid_handle, pid_handle);
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if (!DuplicateHandle (hMainProc, hMainProc, vchild->hProcess, &vchild->ppid_handle,
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0, TRUE, DUPLICATE_SAME_ACCESS))
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system_printf ("Couldn't duplicate my handle<%p> for pid %d, %E", hMainProc, vchild->pid);
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vchild->ppid = myself->pid;
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vchild->uid = myself->uid;
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vchild->gid = myself->gid;
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vchild->pgid = myself->pgid;
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vchild->sid = myself->sid;
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vchild->ctty = myself->ctty;
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vchild->process_state |= PID_INITIALIZING | (myself->process_state & PID_USETTY);
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sigproc_printf ("added pid %d to wait list, slot %d, winpid %p, handle %p",
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vchild->pid, nchildren, vchild->dwProcessId,
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vchild->hProcess);
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nchildren++;
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wake_wait_subproc ();
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break;
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/* A child process had terminated.
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Possibly this is just due to an exec(). Cygwin implements an exec()
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as a "handoff" from one windows process to another. If child->hProcess
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is different from what is recorded in hchildren, then this is an exec().
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Otherwise this is a normal child termination event.
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(called from wait_subproc thread) */
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case PROC_CHILDTERMINATED:
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if (hchildren[val] != pchildren[val]->hProcess)
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{
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sigproc_printf ("pid %d[%d], reparented old hProcess %p, new %p",
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pchildren[val]->pid, val, hchildren[val], pchildren[val]->hProcess);
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HANDLE h = hchildren[val];
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hchildren[val] = pchildren[val]->hProcess; /* Filled out by child */
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sync_proc_subproc->release (); // Release the lock ASAP
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ForceCloseHandle1 (h, childhProc);
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ProtectHandle1 (pchildren[val]->hProcess, childhProc);
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rc = 0;
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goto out; // This was an exec()
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}
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sigproc_printf ("pid %d[%d] terminated, handle %p, nchildren %d, nzombies %d",
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pchildren[val]->pid, val, hchildren[val], nchildren, nzombies);
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int thiszombie;
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thiszombie = nzombies;
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zombies[nzombies] = pchildren[val]; // Add to zombie array
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zombies[nzombies++]->process_state = PID_ZOMBIE;// Walking dead
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sigproc_printf ("zombifying [%d], pid %d, handle %p, nchildren %d",
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val, pchildren[val]->pid, hchildren[val], nchildren);
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if ((int) val < --nchildren)
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{
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hchildren[val] = hchildren[nchildren];
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pchildren[val] = pchildren[nchildren];
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}
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/* See if we should care about the this terminated process. If we've
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filled up our table or if we're ignoring SIGCHLD, then we immediately
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remove the process and move on. Otherwise, this process becomes a zombie
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which must be reaped by a wait() call. */
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if (nzombies >= NZOMBIES
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|| myself->getsig (SIGCHLD).sa_handler == (void *) SIG_IGN)
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{
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sigproc_printf ("automatically removing zombie %d", thiszombie);
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remove_zombie (thiszombie);
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}
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/* Don't scan the wait queue yet. Caller will send SIGCHLD to this process.
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This will cause an eventual scan of waiters. */
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break;
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/* Handle a wait4() operation. Allocates an event for the calling
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* thread which is signaled when the appropriate pid exits or stops.
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* (usually called from the main thread)
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*/
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case PROC_WAIT:
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wval->ev = NULL; // Don't know event flag yet
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if (wval->pid <= 0)
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child = NULL; // Not looking for a specific pid
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else if (!mychild (wval->pid))
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goto out; // invalid pid. flag no such child
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wval->status = 0; // Don't know status yet
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sigproc_printf ("wval->pid %d, wval->options %d", wval->pid, wval->options);
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/* If the first time for this thread, create a new event, otherwise
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* reset the event.
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*/
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if ((wval->ev = wval->thread_ev) == NULL)
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{
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wval->ev = wval->thread_ev = CreateEvent (&sec_none_nih, TRUE,
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FALSE, NULL);
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ProtectHandle (wval->ev);
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}
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ResetEvent (wval->ev);
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w = waitq_head.next;
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waitq_head.next = wval; /* Add at the beginning. */
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wval->next = w; /* Link in rest of the list. */
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clearing = 0;
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goto scan_wait;
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/* Clear all waiting threads. Called from exceptions.cc prior to
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* the main thread's dispatch to a signal handler function.
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* (called from wait_sig thread)
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*/
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case PROC_CLEARWAIT:
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/* Clear all "wait"ing threads. */
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if (val)
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sigproc_printf ("clear waiting threads");
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else
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sigproc_printf ("looking for processes to reap");
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clearing = val;
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scan_wait:
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/* Scan the linked list of wait()ing threads. If a wait's parameters
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* match this pid, then activate it.
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*/
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for (w = &waitq_head; w->next != NULL; w = w->next)
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{
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if ((potential_match = checkstate (w)) > 0)
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sigproc_printf ("released waiting thread");
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else if (!clearing && !(w->next->options & WNOHANG) && potential_match < 0)
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sigproc_printf ("only found non-terminated children");
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else if (potential_match <= 0) // nothing matched
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{
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sigproc_printf ("waiting thread found no children");
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HANDLE oldw = w->next->ev;
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w->next->pid = 0;
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if (clearing)
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w->next->status = -1; /* flag that a signal was received */
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else if (!potential_match || !(w->next->options & WNOHANG))
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w->next->ev = NULL;
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if (!SetEvent (oldw))
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system_printf ("couldn't wake up wait event %p, %E", oldw);
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w->next = w->next->next;
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}
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if (w->next == NULL)
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break;
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}
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if (!clearing)
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sigproc_printf ("finished processing terminated/stopped child");
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else
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{
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waitq_head.next = NULL;
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sigproc_printf ("finished clearing");
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}
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break;
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}
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out:
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sync_proc_subproc->release (); // Release the lock
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out1:
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sigproc_printf ("returning %d", rc);
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return rc;
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}
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/* Terminate the wait_subproc thread.
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* Called on process exit.
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* Also called by spawn_guts to disassociate any subprocesses from this
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* process. Subprocesses will then know to clean up after themselves and
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* will not become zombies.
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*/
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void __stdcall
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proc_terminate (void)
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{
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sigproc_printf ("nchildren %d, nzombies %d", nchildren, nzombies);
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/* Signal processing is assumed to be blocked in this routine. */
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if (hwait_subproc)
|
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{
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proc_loop_wait = 0; // Tell wait_subproc thread to exit
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sync_proc_subproc->acquire (WPSP);
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wake_wait_subproc (); // Wake wait_subproc loop
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hwait_subproc = NULL;
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|
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(void) proc_subproc (PROC_CLEARWAIT, 1);
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|
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/* Clean out zombie processes from the pid list. */
|
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int i;
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for (i = 0; i < nzombies; i++)
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{
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if (zombies[i]->hProcess)
|
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{
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ForceCloseHandle1 (zombies[i]->hProcess, childhProc);
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ForceCloseHandle1 (zombies[i]->pid_handle, pid_handle);
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}
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zombies[i]->ppid = 1;
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zombies[i]->process_state = PID_EXITED; /* CGF FIXME - still needed? */
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zombies[i].release (); // FIXME: this breaks older gccs for some reason
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}
|
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|
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/* Disassociate my subprocesses */
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for (i = 0; i < nchildren; i++)
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{
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if (!pchildren[i]->hProcess)
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sigproc_printf ("%d(%d) hProcess cleared already?", pchildren[i]->pid,
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pchildren[i]->dwProcessId);
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else
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{
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ForceCloseHandle1 (pchildren[i]->hProcess, childhProc);
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sigproc_printf ("%d(%d) closed child handle", pchildren[i]->pid,
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pchildren[i]->dwProcessId);
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pchildren[i]->ppid = 1;
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if (pchildren[i]->pgid == myself->pid)
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pchildren[i]->process_state |= PID_ORPHANED;
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}
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pchildren[i].release ();
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}
|
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nchildren = nzombies = 0;
|
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/* Just zero sync_proc_subproc as the delete below seems to cause
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problems for older gccs. */
|
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sync_proc_subproc = NULL;
|
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}
|
|
sigproc_printf ("leaving");
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}
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|
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/* Clear pending signal from the sigtodo array
|
|
*/
|
|
void __stdcall
|
|
sig_clear (int sig)
|
|
{
|
|
(void) InterlockedExchange (myself->getsigtodo (sig), 0L);
|
|
return;
|
|
}
|
|
|
|
/* Force the wait_sig thread to wake up and scan the sigtodo array.
|
|
*/
|
|
extern "C" int __stdcall
|
|
sig_dispatch_pending (int justwake)
|
|
{
|
|
if (!hwait_sig)
|
|
return 0;
|
|
DWORD tid = GetCurrentThreadId ();
|
|
|
|
sigframe thisframe (mainthread);
|
|
|
|
if (tid == sigtid && !justwake)
|
|
justwake = 1;
|
|
|
|
int was_pending = pending_signals;
|
|
#ifdef DEBUGGING
|
|
sigproc_printf ("pending_signals %d", was_pending);
|
|
#endif
|
|
if (!was_pending && !justwake)
|
|
#ifdef DEBUGGING
|
|
sigproc_printf ("no need to wake anything up");
|
|
#else
|
|
;
|
|
#endif
|
|
else
|
|
{
|
|
assert (!wait_sig_inited);
|
|
if (!justwake)
|
|
(void) sig_send (myself, __SIGFLUSH);
|
|
else if (ReleaseSemaphore (sigcatch_nosync, 1, NULL))
|
|
#ifdef DEBUGGING
|
|
sigproc_printf ("woke up wait_sig");
|
|
#else
|
|
;
|
|
#endif
|
|
else if (no_signals_available ())
|
|
/*sigproc_printf ("I'm going away now")*/;
|
|
else
|
|
system_printf ("%E releasing sigcatch_nosync(%p)", sigcatch_nosync);
|
|
|
|
}
|
|
if (was_pending && !justwake)
|
|
thisframe.call_signal_handler ();
|
|
|
|
return was_pending;
|
|
}
|
|
|
|
/* Message initialization. Called from dll_crt0_1
|
|
*
|
|
* This routine starts the signal handling thread. The wait_sig_inited
|
|
* event is used to signal that the thread is ready to handle signals.
|
|
* We don't wait for this during initialization but instead detect it
|
|
* in sig_send to gain a little concurrency.
|
|
*/
|
|
void __stdcall
|
|
sigproc_init ()
|
|
{
|
|
wait_sig_inited = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
|
|
ProtectHandle (wait_sig_inited);
|
|
|
|
/* sync_proc_subproc is used by proc_subproc. It serialises
|
|
* access to the children and zombie arrays.
|
|
*/
|
|
new_muto (sync_proc_subproc);
|
|
|
|
/* local event signaled when main thread has been dispatched
|
|
to a signal handler function. */
|
|
signal_arrived = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
|
|
ProtectHandle (signal_arrived);
|
|
|
|
hwait_sig = new cygthread (wait_sig, cygself, "sig");
|
|
hwait_sig->zap_h ();
|
|
|
|
/* Initialize waitq structure for main thread. A waitq structure is
|
|
* allocated for each thread that executes a wait to allow multiple threads
|
|
* to perform waits. Pre-allocate a waitq structure for the main thread.
|
|
*/
|
|
waitq *w;
|
|
if ((w = (waitq *)waitq_storage.get ()) == NULL)
|
|
{
|
|
w = &waitq_main;
|
|
waitq_storage.set (w);
|
|
}
|
|
memset (w, 0, sizeof *w); // Just to be safe
|
|
|
|
myself->getsig (SIGSTOP).sa_flags = SA_RESTART | SA_NODEFER;
|
|
sigproc_printf ("process/signal handling enabled(%x)", myself->process_state);
|
|
return;
|
|
}
|
|
|
|
/* Called on process termination to terminate signal and process threads.
|
|
*/
|
|
void __stdcall
|
|
sigproc_terminate (void)
|
|
{
|
|
hwait_sig = NULL;
|
|
|
|
if (!sig_loop_wait)
|
|
sigproc_printf ("sigproc_terminate: sigproc handling not active");
|
|
else
|
|
{
|
|
sigproc_printf ("entering");
|
|
sig_loop_wait = 0; // Tell wait_sig to exit when it is
|
|
// finished with anything it is doing
|
|
sig_dispatch_pending (1);
|
|
}
|
|
|
|
if (GetCurrentThreadId () == sigtid)
|
|
{
|
|
ForceCloseHandle (sigcomplete_main);
|
|
for (int i = 0; i < 20; i++)
|
|
(void) ReleaseSemaphore (sigcomplete_nonmain, 1, NULL);
|
|
// ForceCloseHandle (sigcomplete_nonmain);
|
|
// ForceCloseHandle (sigcatch_main);
|
|
// ForceCloseHandle (sigcatch_nonmain);
|
|
// ForceCloseHandle (sigcatch_nosync);
|
|
}
|
|
proc_terminate (); // Terminate process handling thread
|
|
|
|
return;
|
|
}
|
|
|
|
/* Send a signal to another process by raising its signal semaphore.
|
|
* If pinfo *p == NULL, send to the current process.
|
|
* If sending to this process, wait for notification that a signal has
|
|
* completed before returning.
|
|
*/
|
|
int __stdcall
|
|
sig_send (_pinfo *p, int sig, DWORD ebp, bool exception)
|
|
{
|
|
int rc = 1;
|
|
DWORD tid = GetCurrentThreadId ();
|
|
BOOL its_me;
|
|
HANDLE thiscatch = NULL;
|
|
HANDLE thiscomplete = NULL;
|
|
BOOL wait_for_completion;
|
|
sigframe thisframe;
|
|
|
|
if (p == myself_nowait_nonmain)
|
|
p = (tid == mainthread.id) ? (_pinfo *) myself : myself_nowait;
|
|
if (!(its_me = (p == NULL || p == myself || p == myself_nowait)))
|
|
wait_for_completion = FALSE;
|
|
else
|
|
{
|
|
if (no_signals_available ())
|
|
goto out; // Either exiting or not yet initializing
|
|
assert (!wait_sig_inited);
|
|
wait_for_completion = p != myself_nowait;
|
|
p = myself;
|
|
}
|
|
|
|
/* It is possible that the process is not yet ready to receive messages
|
|
* or that it has exited. Detect this.
|
|
*/
|
|
if (!proc_can_be_signalled (p)) /* Is the process accepting messages? */
|
|
{
|
|
sigproc_printf ("invalid pid %d(%x), signal %d",
|
|
p->pid, p->process_state, sig);
|
|
set_errno (ESRCH);
|
|
goto out;
|
|
}
|
|
|
|
sigproc_printf ("pid %d, signal %d, its_me %d", p->pid, sig, its_me);
|
|
|
|
if (its_me)
|
|
{
|
|
if (!wait_for_completion)
|
|
thiscatch = sigcatch_nosync;
|
|
else if (tid != mainthread.id)
|
|
{
|
|
thiscatch = sigcatch_nonmain;
|
|
thiscomplete = sigcomplete_nonmain;
|
|
}
|
|
else
|
|
{
|
|
thiscatch = sigcatch_main;
|
|
thiscomplete = sigcomplete_main;
|
|
thisframe.set (mainthread, ebp, exception);
|
|
}
|
|
}
|
|
else if (!(thiscatch = getsem (p, "sigcatch", 0, 0)))
|
|
goto out; // Couldn't get the semaphore. getsem issued
|
|
// an error, if appropriate.
|
|
|
|
#if WHEN_MULTI_THREAD_SIGNALS_WORK
|
|
signal_dispatch *sd;
|
|
sd = signal_dispatch_storage.get ();
|
|
if (sd == NULL)
|
|
sd = signal_dispatch_storage.create ();
|
|
#endif
|
|
|
|
/* Increment the sigtodo array to signify which signal to assert.
|
|
*/
|
|
(void) InterlockedIncrement (p->getsigtodo (sig));
|
|
|
|
/* Notify the process that a signal has arrived.
|
|
*/
|
|
SetLastError (0);
|
|
|
|
#if 0
|
|
int prio;
|
|
prio = GetThreadPriority (GetCurrentThread ());
|
|
(void) SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_TIME_CRITICAL);
|
|
#endif
|
|
|
|
if (!ReleaseSemaphore (thiscatch, 1, NULL) && (int) GetLastError () > 0)
|
|
{
|
|
/* Couldn't signal the semaphore. This probably means that the
|
|
* process is exiting.
|
|
*/
|
|
if (!its_me)
|
|
ForceCloseHandle (thiscatch);
|
|
else
|
|
{
|
|
if (no_signals_available ())
|
|
sigproc_printf ("I'm going away now");
|
|
else if ((int) GetLastError () == -1)
|
|
rc = WaitForSingleObject (thiscomplete, 500);
|
|
else
|
|
system_printf ("error sending signal %d to pid %d, semaphore %p, %E",
|
|
sig, p->pid, thiscatch);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
/* No need to wait for signal completion unless this was a signal to
|
|
* this process.
|
|
*
|
|
* If it was a signal to this process, wait for a dispatched signal.
|
|
* Otherwise just wait for the wait_sig to signal that it has finished
|
|
* processing the signal.
|
|
*/
|
|
if (!wait_for_completion)
|
|
{
|
|
rc = WAIT_OBJECT_0;
|
|
sigproc_printf ("Not waiting for sigcomplete. its_me %d signal %d", its_me, sig);
|
|
if (!its_me)
|
|
ForceCloseHandle (thiscatch);
|
|
}
|
|
else
|
|
{
|
|
sigproc_printf ("Waiting for thiscomplete %p", thiscomplete);
|
|
|
|
SetLastError (0);
|
|
rc = WaitForSingleObject (thiscomplete, WSSC);
|
|
/* Check for strangeness due to this thread being redirected by the
|
|
signal handler. Sometimes a WAIT_TIMEOUT will occur when the
|
|
thread hasn't really timed out. So, check again.
|
|
FIXME: This isn't foolproof. */
|
|
if (rc != WAIT_OBJECT_0 &&
|
|
WaitForSingleObject (thiscomplete, 0) == WAIT_OBJECT_0)
|
|
rc = WAIT_OBJECT_0;
|
|
}
|
|
|
|
#if 0
|
|
SetThreadPriority (GetCurrentThread (), prio);
|
|
#endif
|
|
|
|
if (rc == WAIT_OBJECT_0)
|
|
rc = 0; // Successful exit
|
|
else
|
|
{
|
|
/* It's an error unless sig_loop_wait == 0 (the process is exiting). */
|
|
if (!no_signals_available ())
|
|
system_printf ("wait for sig_complete event failed, signal %d, rc %d, %E",
|
|
sig, rc);
|
|
set_errno (ENOSYS);
|
|
rc = -1;
|
|
}
|
|
|
|
out:
|
|
sigproc_printf ("returning %d from sending signal %d", rc, sig);
|
|
return rc;
|
|
}
|
|
|
|
/* Set pending signal from the sigtodo array
|
|
*/
|
|
void __stdcall
|
|
sig_set_pending (int sig)
|
|
{
|
|
(void) InterlockedIncrement (myself->getsigtodo (sig));
|
|
return;
|
|
}
|
|
|
|
/* Initialize the wait_subproc thread.
|
|
* Called from fork() or spawn() to initialize the handling of subprocesses.
|
|
*/
|
|
void __stdcall
|
|
subproc_init (void)
|
|
{
|
|
if (hwait_subproc)
|
|
return;
|
|
|
|
/* A "wakeup" handle which can be toggled to make wait_subproc reexamine
|
|
* the hchildren array.
|
|
*/
|
|
events[0] = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
hwait_subproc = new cygthread (wait_subproc, NULL, "proc");
|
|
hwait_subproc->zap_h ();
|
|
ProtectHandle (events[0]);
|
|
sigproc_printf ("started wait_subproc thread");
|
|
}
|
|
|
|
/* Initialize some of the memory block passed to child processes
|
|
by fork/spawn/exec. */
|
|
|
|
void __stdcall
|
|
init_child_info (DWORD chtype, child_info *ch, pid_t pid, HANDLE subproc_ready)
|
|
{
|
|
memset (ch, 0, sizeof *ch);
|
|
ch->cb = chtype == PROC_FORK ? sizeof (child_info_fork) : sizeof (child_info);
|
|
ch->intro = PROC_MAGIC_GENERIC;
|
|
ch->magic = CHILD_INFO_MAGIC;
|
|
ch->type = chtype;
|
|
ch->cygpid = pid;
|
|
ch->subproc_ready = subproc_ready;
|
|
ch->pppid_handle = myself->ppid_handle;
|
|
ch->fhandler_union_cb = sizeof (fhandler_union);
|
|
ch->mount_h = cygwin_mount_h;
|
|
}
|
|
|
|
/* Check the state of all of our children to see if any are stopped or
|
|
* terminated.
|
|
*/
|
|
static int __stdcall
|
|
checkstate (waitq *parent_w)
|
|
{
|
|
int potential_match = 0;
|
|
|
|
sigproc_printf ("nchildren %d, nzombies %d", nchildren, nzombies);
|
|
|
|
/* Check already dead processes first to see if they match the criteria
|
|
* given in w->next.
|
|
*/
|
|
for (int i = 0; i < nzombies; i++)
|
|
switch (stopped_or_terminated (parent_w, zombies[i]))
|
|
{
|
|
case -1:
|
|
potential_match = -1;
|
|
break;
|
|
case 1:
|
|
remove_zombie (i);
|
|
potential_match = 1;
|
|
goto out;
|
|
}
|
|
|
|
sigproc_printf ("checking alive children");
|
|
|
|
/* No dead terminated children matched. Check for stopped children. */
|
|
for (int i = 0; i < nchildren; i++)
|
|
switch (stopped_or_terminated (parent_w, pchildren[i]))
|
|
{
|
|
case -1:
|
|
potential_match = -1;
|
|
break;
|
|
case 1:
|
|
potential_match = 1;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
sigproc_printf ("returning %d", potential_match);
|
|
return potential_match;
|
|
}
|
|
|
|
/* Get or create a process specific semaphore used in message passing.
|
|
*/
|
|
static HANDLE __stdcall
|
|
getsem (_pinfo *p, const char *str, int init, int max)
|
|
{
|
|
HANDLE h;
|
|
|
|
if (p != NULL)
|
|
{
|
|
if (!proc_can_be_signalled (p))
|
|
{
|
|
set_errno (ESRCH);
|
|
return NULL;
|
|
}
|
|
int wait = 1000;
|
|
/* Wait for new process to generate its semaphores. */
|
|
sigproc_printf ("pid %d, ppid %d, wait %d, initializing %x", p->pid, p->ppid, wait,
|
|
ISSTATE (p, PID_INITIALIZING));
|
|
for (int i = 0; ISSTATE (p, PID_INITIALIZING) && i < wait; i++)
|
|
low_priority_sleep (1);
|
|
}
|
|
|
|
SetLastError (0);
|
|
if (p == NULL)
|
|
{
|
|
char sa_buf[1024];
|
|
|
|
DWORD winpid = GetCurrentProcessId ();
|
|
h = CreateSemaphore (sec_user_nih (sa_buf), init, max,
|
|
str = shared_name (str, winpid));
|
|
p = myself;
|
|
if (!h)
|
|
{
|
|
system_printf ("can't create semaphore %s, %E", str);
|
|
__seterrno ();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
h = OpenSemaphore (SEMAPHORE_ALL_ACCESS, FALSE,
|
|
shared_name (str, p->dwProcessId));
|
|
|
|
if (!h)
|
|
{
|
|
if (GetLastError () == ERROR_FILE_NOT_FOUND && !proc_exists (p))
|
|
set_errno (ESRCH); /* No such process */
|
|
else
|
|
set_errno (EPERM); /* Couldn't access the semaphore --
|
|
different cygwin DLL maybe? */
|
|
}
|
|
}
|
|
|
|
return h;
|
|
}
|
|
|
|
/* Remove a zombie from zombies by swapping it with the last child in the list.
|
|
*/
|
|
static void __stdcall
|
|
remove_zombie (int ci)
|
|
{
|
|
sigproc_printf ("removing %d, pid %d, nzombies %d", ci, zombies[ci]->pid,
|
|
nzombies);
|
|
|
|
if (zombies[ci])
|
|
{
|
|
ForceCloseHandle1 (zombies[ci]->hProcess, childhProc);
|
|
ForceCloseHandle1 (zombies[ci]->pid_handle, pid_handle);
|
|
zombies[ci].release ();
|
|
}
|
|
|
|
if (ci < --nzombies)
|
|
zombies[ci] = zombies[nzombies];
|
|
|
|
return;
|
|
}
|
|
|
|
/* Check status of child process vs. waitq member.
|
|
*
|
|
* parent_w is the pointer to the parent of the waitq member in question.
|
|
* child is the subprocess being considered.
|
|
*
|
|
* Returns
|
|
* 1 if stopped or terminated child matches parent_w->next criteria
|
|
* -1 if a non-stopped/terminated child matches parent_w->next criteria
|
|
* 0 if child does not match parent_w->next criteria
|
|
*/
|
|
static int __stdcall
|
|
stopped_or_terminated (waitq *parent_w, _pinfo *child)
|
|
{
|
|
int potential_match;
|
|
waitq *w = parent_w->next;
|
|
|
|
sigproc_printf ("considering pid %d", child->pid);
|
|
if (w->pid == -1)
|
|
potential_match = 1;
|
|
else if (w->pid == 0)
|
|
potential_match = child->pgid == myself->pgid;
|
|
else if (w->pid < 0)
|
|
potential_match = child->pgid == -w->pid;
|
|
else
|
|
potential_match = (w->pid == child->pid);
|
|
|
|
if (!potential_match)
|
|
return 0;
|
|
|
|
BOOL terminated;
|
|
|
|
if ((terminated = child->process_state == PID_ZOMBIE) ||
|
|
((w->options & WUNTRACED) && child->stopsig))
|
|
{
|
|
parent_w->next = w->next; /* successful wait. remove from wait queue */
|
|
w->pid = child->pid;
|
|
|
|
if (!terminated)
|
|
{
|
|
sigproc_printf ("stopped child");
|
|
w->status = (child->stopsig << 8) | 0x7f;
|
|
child->stopsig = 0;
|
|
}
|
|
else /* Should only get here when child has been moved to the zombies array */
|
|
{
|
|
DWORD status;
|
|
if (!GetExitCodeProcess (child->hProcess, &status))
|
|
status = 0xffff;
|
|
if (status & EXIT_SIGNAL)
|
|
w->status = (status >> 8) & 0xff; /* exited due to signal */
|
|
else
|
|
w->status = (status & 0xff) << 8; /* exited via "exit ()" */
|
|
|
|
add_rusage (&myself->rusage_children, &child->rusage_children);
|
|
add_rusage (&myself->rusage_children, &child->rusage_self);
|
|
|
|
if (w->rusage)
|
|
{
|
|
add_rusage ((struct rusage *) w->rusage, &child->rusage_children);
|
|
add_rusage ((struct rusage *) w->rusage, &child->rusage_self);
|
|
}
|
|
}
|
|
|
|
if (!SetEvent (w->ev)) /* wake up wait4 () immediately */
|
|
system_printf ("couldn't wake up wait event %p, %E", w->ev);
|
|
return 1;
|
|
}
|
|
|
|
return -potential_match;
|
|
}
|
|
|
|
static void
|
|
talktome ()
|
|
{
|
|
winpids pids;
|
|
for (unsigned i = 0; i < pids.npids; i++)
|
|
if (pids[i]->hello_pid == myself->pid)
|
|
pids[i]->commune_recv ();
|
|
}
|
|
|
|
/* Process signals by waiting for a semaphore to become signaled.
|
|
* Then scan an in-memory array representing queued signals.
|
|
* Executes in a separate thread.
|
|
*
|
|
* Signals sent from this process are sent a completion signal so
|
|
* that returns from kill/raise do not occur until the signal has
|
|
* has been handled, as per POSIX.
|
|
*/
|
|
static DWORD WINAPI
|
|
wait_sig (VOID *self)
|
|
{
|
|
/* Initialization */
|
|
(void) SetThreadPriority (GetCurrentThread (), WAIT_SIG_PRIORITY);
|
|
|
|
/* sigcatch_nosync - semaphore incremented by sig_dispatch_pending and
|
|
* by foreign processes to force an examination of
|
|
* the sigtodo array.
|
|
* sigcatch_main - ditto for local main thread.
|
|
* sigcatch_nonmain - ditto for local non-main threads.
|
|
*
|
|
* sigcomplete_main - event used to signal main thread on signal
|
|
* completion
|
|
* sigcomplete_nonmain - semaphore signaled for non-main thread on signal
|
|
* completion
|
|
*/
|
|
sigcatch_nosync = getsem (NULL, "sigcatch", 0, MAXLONG);
|
|
sigcatch_nonmain = CreateSemaphore (&sec_none_nih, 0, MAXLONG, NULL);
|
|
sigcatch_main = CreateSemaphore (&sec_none_nih, 0, MAXLONG, NULL);
|
|
sigcomplete_nonmain = CreateSemaphore (&sec_none_nih, 0, MAXLONG, NULL);
|
|
sigcomplete_main = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
sigproc_printf ("sigcatch_nonmain %p, sigcatch_main %p", sigcatch_nonmain, sigcatch_main);
|
|
sigCONT = CreateEvent (&sec_none_nih, FALSE, FALSE, NULL);
|
|
|
|
/* Setting dwProcessId flags that this process is now capable of receiving
|
|
* signals. Prior to this, dwProcessId was set to the windows pid of
|
|
* of the original windows process which spawned us unless this was a
|
|
* "toplevel" process.
|
|
*/
|
|
myself->dwProcessId = GetCurrentProcessId ();
|
|
myself->process_state |= PID_ACTIVE;
|
|
myself->process_state &= ~PID_INITIALIZING;
|
|
|
|
ProtectHandle (sigcatch_nosync);
|
|
ProtectHandle (sigcatch_nonmain);
|
|
ProtectHandle (sigcatch_main);
|
|
ProtectHandle (sigcomplete_nonmain);
|
|
ProtectHandle (sigcomplete_main);
|
|
|
|
/* If we've been execed, then there is still a stub left in the previous
|
|
* windows process waiting to see if it's started a cygwin process or not.
|
|
* Signalling subproc_ready indicates that we are a cygwin process.
|
|
*/
|
|
if (child_proc_info && child_proc_info->type == PROC_EXEC)
|
|
{
|
|
debug_printf ("subproc_ready %p", child_proc_info->subproc_ready);
|
|
if (!SetEvent (child_proc_info->subproc_ready))
|
|
system_printf ("SetEvent (subproc_ready) failed, %E");
|
|
ForceCloseHandle1 (child_proc_info->subproc_ready, subproc_ready);
|
|
/* Initialize an "indirect" pid block so that if someone looks up this
|
|
process via its Windows PID it will be redirected to the appropriate
|
|
Cygwin PID shared memory block. */
|
|
static pinfo NO_COPY myself_identity;
|
|
myself_identity.init (cygwin_pid (myself->dwProcessId), PID_EXECED);
|
|
}
|
|
|
|
SetEvent (wait_sig_inited);
|
|
sigtid = GetCurrentThreadId ();
|
|
|
|
HANDLE catchem[] = {sigcatch_main, sigcatch_nonmain, sigcatch_nosync};
|
|
sigproc_printf ("Ready. dwProcessid %d", myself->dwProcessId);
|
|
for (;;)
|
|
{
|
|
DWORD rc = WaitForMultipleObjects (3, catchem, FALSE, sig_loop_wait);
|
|
(void) SetThreadPriority (GetCurrentThread (), WAIT_SIG_PRIORITY);
|
|
|
|
/* sigproc_terminate sets sig_loop_wait to zero to indicate that
|
|
* this thread should terminate.
|
|
*/
|
|
if (rc == WAIT_TIMEOUT)
|
|
{
|
|
if (!sig_loop_wait)
|
|
break; // Exiting
|
|
else
|
|
continue;
|
|
}
|
|
|
|
if (rc == WAIT_FAILED)
|
|
{
|
|
if (sig_loop_wait != 0)
|
|
system_printf ("WFMO failed, %E");
|
|
break;
|
|
}
|
|
|
|
rc -= WAIT_OBJECT_0;
|
|
sigproc_printf ("awake");
|
|
/* A sigcatch semaphore has been signaled. Scan the sigtodo
|
|
* array looking for any unprocessed signals.
|
|
*/
|
|
pending_signals = -1;
|
|
int saw_pending_signals = 0;
|
|
int saw_sigchld = 0;
|
|
for (int sig = -__SIGOFFSET; sig < NSIG; sig++)
|
|
{
|
|
while (InterlockedDecrement (myself->getsigtodo (sig)) >= 0)
|
|
{
|
|
if (sig == SIGCHLD)
|
|
saw_sigchld = 1;
|
|
|
|
if (sig > 0 && sig != SIGKILL && sig != SIGSTOP &&
|
|
(sigismember (&myself->getsigmask (), sig) ||
|
|
main_vfork->pid ||
|
|
(sig != SIGCONT && ISSTATE (myself, PID_STOPPED))))
|
|
{
|
|
sigproc_printf ("signal %d blocked", sig);
|
|
break;
|
|
}
|
|
|
|
/* Found a signal to process */
|
|
sigproc_printf ("processing signal %d", sig);
|
|
switch (sig)
|
|
{
|
|
case __SIGFLUSH:
|
|
/* just forcing the loop */
|
|
break;
|
|
|
|
/* Internal signal to turn on stracing. */
|
|
case __SIGSTRACE:
|
|
strace.hello ();
|
|
break;
|
|
|
|
case __SIGCOMMUNE:
|
|
talktome ();
|
|
break;
|
|
|
|
/* A normal UNIX signal */
|
|
default:
|
|
sigproc_printf ("Got signal %d", sig);
|
|
sig_handle (sig, rc != 2);
|
|
/* Need to decrement again to offset increment below since
|
|
we really do want to decrement in this case. */
|
|
InterlockedDecrement (myself->getsigtodo (sig));
|
|
goto nextsig; /* FIXME: shouldn't this allow the loop to continue? */
|
|
}
|
|
}
|
|
|
|
nextsig:
|
|
/* Decremented too far. */
|
|
if (InterlockedIncrement (myself->getsigtodo (sig)) > 0)
|
|
saw_pending_signals = 1;
|
|
}
|
|
|
|
if (pending_signals < 0 && !saw_pending_signals)
|
|
pending_signals = 0;
|
|
|
|
if (saw_sigchld)
|
|
proc_subproc (PROC_CLEARWAIT, 0);
|
|
|
|
/* Signal completion of signal handling depending on which semaphore
|
|
* woke up the WaitForMultipleObjects above.
|
|
*/
|
|
switch (rc)
|
|
{
|
|
case 0:
|
|
SetEvent (sigcomplete_main);
|
|
sigproc_printf ("set main thread completion event");
|
|
break;
|
|
case 1:
|
|
ReleaseSemaphore (sigcomplete_nonmain, 1, NULL);
|
|
break;
|
|
default:
|
|
/* Signal from another process. No need to synchronize. */
|
|
break;
|
|
}
|
|
sigproc_printf ("looping");
|
|
}
|
|
|
|
sigproc_printf ("done");
|
|
ExitThread (0);
|
|
}
|
|
|
|
/* Wait for subprocesses to terminate. Executes in a separate thread. */
|
|
static DWORD WINAPI
|
|
wait_subproc (VOID *)
|
|
{
|
|
sigproc_printf ("starting");
|
|
int errloop = 0;
|
|
|
|
for (;;)
|
|
{
|
|
DWORD rc = WaitForMultipleObjects (nchildren + 1, events, FALSE,
|
|
proc_loop_wait);
|
|
if (rc == WAIT_TIMEOUT)
|
|
if (!proc_loop_wait)
|
|
break; // Exiting
|
|
else
|
|
continue;
|
|
|
|
if (rc == WAIT_FAILED)
|
|
{
|
|
if (!proc_loop_wait)
|
|
break;
|
|
|
|
/* It's ok to get an ERROR_INVALID_HANDLE since another thread may have
|
|
closed a handle in the children[] array. So, we try looping a couple
|
|
of times to stabilize. FIXME - this is not foolproof. Probably, this
|
|
thread should be responsible for closing the children. */
|
|
if (!errloop++)
|
|
proc_subproc (PROC_NOTHING, 0); // Just synchronize and continue
|
|
if (errloop < 10)
|
|
continue;
|
|
|
|
system_printf ("wait failed. nchildren %d, wait %d, %E",
|
|
nchildren, proc_loop_wait);
|
|
|
|
for (int i = 0; i <= nchildren; i++)
|
|
if ((rc = WaitForSingleObject (events[i], 0)) == WAIT_OBJECT_0 ||
|
|
rc == WAIT_TIMEOUT)
|
|
continue;
|
|
else if (i == 0)
|
|
system_printf ("nchildren %d, event[%d] %p, %E", nchildren, i, events[i]);
|
|
else
|
|
{
|
|
system_printf ("nchildren %d, event[%d] %p, pchildren[%d] %p, events[0] %p, %E",
|
|
nchildren, i, events[i], i - 1, (_pinfo *) pchildren[i - 1], events[0]);
|
|
system_printf ("pid %d, dwProcessId %u, hProcess %p, progname '%s'",
|
|
pchildren[i - 1]->pid, pchildren[i - 1]->dwProcessId,
|
|
pchildren[i - 1]->hProcess, pchildren[i - 1]->progname);
|
|
}
|
|
break;
|
|
}
|
|
|
|
errloop = 0;
|
|
rc -= WAIT_OBJECT_0;
|
|
if (rc-- != 0)
|
|
{
|
|
rc = proc_subproc (PROC_CHILDTERMINATED, rc);
|
|
if (!proc_loop_wait) // Don't bother if wait_subproc is
|
|
break; // exiting
|
|
|
|
/* Send a SIGCHLD to myself. We do this here, rather than in proc_subproc
|
|
to avoid the proc_subproc lock since the signal thread will eventually
|
|
be calling proc_subproc and could unnecessarily block. */
|
|
if (rc)
|
|
sig_send (myself_nowait, SIGCHLD);
|
|
}
|
|
sigproc_printf ("looping");
|
|
}
|
|
|
|
ForceCloseHandle (events[0]);
|
|
events[0] = NULL;
|
|
sigproc_printf ("done");
|
|
ExitThread (0);
|
|
}
|
|
|
|
extern "C" {
|
|
/* Provide a stack frame when calling WaitFor* functions */
|
|
|
|
#undef WaitForSingleObject
|
|
|
|
DWORD __stdcall
|
|
WFSO (HANDLE hHandle, DWORD dwMilliseconds)
|
|
{
|
|
DWORD ret;
|
|
sigframe thisframe (mainthread);
|
|
ret = WaitForSingleObject (hHandle, dwMilliseconds);
|
|
return ret;
|
|
}
|
|
|
|
#undef WaitForMultipleObjects
|
|
|
|
DWORD __stdcall
|
|
WFMO (DWORD nCount, CONST HANDLE *lpHandles, BOOL fWaitAll, DWORD dwMilliseconds)
|
|
{
|
|
DWORD ret;
|
|
sigframe thisframe (mainthread);
|
|
ret = WaitForMultipleObjects (nCount, lpHandles, fWaitAll, dwMilliseconds);
|
|
return ret;
|
|
}
|
|
}
|