f02f1f1444
interruptible. (call_handler): Avoid suspending a thread if it owns a mutex. Only set signal_arrived if the thread was actually interrupted. (events_init): Initialize module information needed by interruptible(). (sigdelayed): Don't call sig_dispatch_pending since it could screw up * init.cc (dll_entry): Record module handle of main for use by interruptible(). (proc_subproc): Reorganize handling of terminated child so that the bulk of the processing comes from the signal thread. (wait_sig): Force processing of waiting threads if SIGCHLD is not processed. * sync.cc (muto::release): Set tid == 0 after lock is released or signal processor will be confused.
625 lines
18 KiB
C++
625 lines
18 KiB
C++
/* fork.cc
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Copyright 1996, 1997, 1998, 1999, 2000 Cygnus Solutions.
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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 <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <errno.h>
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#include "winsup.h"
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#include "dll_init.h"
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DWORD chunksize = 0;
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/* Timeout to wait for child to start, parent to init child, etc. */
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/* FIXME: Once things stabilize, bump up to a few minutes. */
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#define FORK_WAIT_TIMEOUT (300 * 1000) /* 300 seconds */
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#define dll_data_start &_data_start__
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#define dll_data_end &_data_end__
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#define dll_bss_start &_bss_start__
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#define dll_bss_end &_bss_end__
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void
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per_thread::set (void *s)
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{
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if (s == PER_THREAD_FORK_CLEAR)
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{
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tls = TlsAlloc ();
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s = NULL;
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}
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TlsSetValue (get_tls (), s);
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}
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static void
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stack_base (child_info_fork &ch)
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{
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MEMORY_BASIC_INFORMATION m;
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memset (&m, 0, sizeof m);
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if (!VirtualQuery ((LPCVOID) &m, &m, sizeof m))
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system_printf ("couldn't get memory info, %E");
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ch.stacktop = m.AllocationBase;
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ch.stackbottom = (LPBYTE) m.BaseAddress + m.RegionSize;
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ch.stacksize = (DWORD) ch.stackbottom - (DWORD) &m;
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debug_printf ("bottom %p, top %p, stack %p, size %d, reserve %d",
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ch.stackbottom, ch.stacktop, &m, ch.stacksize,
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(DWORD) ch.stackbottom - (DWORD) ch.stacktop);
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}
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/* Copy memory from parent to child.
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The result is a boolean indicating success. */
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static int
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fork_copy (PROCESS_INFORMATION &pi, const char *what, ...)
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{
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va_list args;
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char *low;
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int pass = 0;
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va_start (args, what);
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while ((low = va_arg (args, char *)))
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{
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char *high = va_arg (args, char *);
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DWORD todo = chunksize ?: high - low;
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char *here;
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for (here = low; here < high; here += todo)
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{
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DWORD done = 0;
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if (here + todo > high)
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todo = high - here;
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int res = WriteProcessMemory (pi.hProcess, here, here, todo, &done);
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debug_printf ("child handle %p, low %p, high %p, res %d", pi.hProcess,
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low, high, res);
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if (!res || todo != done)
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{
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if (!res)
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__seterrno ();
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/* If this happens then there is a bug in our fork
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implementation somewhere. */
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system_printf ("%s pass %d failed, %p..%p, done %d, %E",
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what, pass, low, high, done);
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goto err;
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}
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}
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pass++;
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}
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debug_printf ("done");
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return 1;
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err:
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TerminateProcess (pi.hProcess, 1);
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set_errno (EAGAIN);
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return 0;
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}
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/* Wait for child to finish what it's doing and signal us.
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We don't want to wait forever here.If there's a problem somewhere
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it'll hang the entire system (since all forks are mutex'd). If we
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time out, set errno = EAGAIN and hope the app tries again. */
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static int
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sync_with_child (PROCESS_INFORMATION &pi, HANDLE subproc_ready,
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BOOL hang_child, const char *s)
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{
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/* We also add the child process handle to the wait. If the child fails
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to initialize (eg. because of a missing dll). Then this
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handle will become signalled. This stops a *looong* timeout wait.
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*/
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HANDLE w4[2];
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debug_printf ("waiting for child. reason: %s", s);
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w4[1] = pi.hProcess;
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w4[0] = subproc_ready;
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DWORD rc = WaitForMultipleObjects (2, w4, FALSE, FORK_WAIT_TIMEOUT);
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if (rc == WAIT_OBJECT_0 ||
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WaitForSingleObject (subproc_ready, 0) == WAIT_OBJECT_0)
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/* That's ok */;
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else if (rc == WAIT_FAILED || rc == WAIT_TIMEOUT)
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{
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if (rc != WAIT_FAILED)
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system_printf ("WaitForMultipleObjects timed out");
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else
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system_printf ("WaitForMultipleObjects failed, %E");
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set_errno (EAGAIN);
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syscall_printf ("-1 = fork(), WaitForMultipleObjects failed");
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TerminateProcess (pi.hProcess, 1);
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return 0;
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}
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else
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{
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/* Child died. Clean up and exit. */
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DWORD errcode;
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GetExitCodeProcess (pi.hProcess, &errcode);
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/* Fix me. This is not enough. The fork should not be considered
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* to have failed if the process was essentially killed by a signal.
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*/
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if (errcode != STATUS_CONTROL_C_EXIT)
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{
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system_printf ("child %d(%p) died before initialization with status code %p",
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pi.dwProcessId, pi.hProcess, errcode);
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system_printf ("*** child state %s", s);
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#ifdef DEBUGGING
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abort ();
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#endif
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}
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set_errno (EAGAIN);
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syscall_printf ("Child died before subproc_ready signalled");
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return 0;
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}
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debug_printf ("child signalled me");
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if (hang_child)
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{
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int n = SuspendThread (pi.hThread);
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debug_printf ("suspend count %d", n); \
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}
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return 1;
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}
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static int
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resume_child (PROCESS_INFORMATION &pi, HANDLE forker_finished)
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{
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int rc;
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debug_printf ("here");
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SetEvent (forker_finished);
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rc = ResumeThread (pi.hThread);
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debug_printf ("rc %d", rc);
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if (rc == 1)
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return 1; // Successful resumption
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/* Can't resume the thread. Not sure why this would happen unless
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there's a bug in the system. Things seem to be working OK now
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though, so flag this with EAGAIN, but print a message on the
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console. */
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small_printf ("fork: ResumeThread failed, rc = %d, %E\n", rc);
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set_errno (EAGAIN);
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syscall_printf ("-1 = fork(), ResumeThread failed");
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TerminateProcess (pi.hProcess, 1);
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return 0;
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}
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/* Notify parent that it is time for the next step.
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Note that this has to be a macro since the parent may be messing with
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our stack. */
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#define sync_with_parent(s, hang_self) \
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((void) ({ \
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debug_printf ("signalling parent: %s", s); \
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/* Tell our parent we're waiting. */ \
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if (!SetEvent (child_proc_info->subproc_ready)) \
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api_fatal ("fork child - SetEvent failed, %E"); \
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if (hang_self) \
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{ \
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/* Wait for the parent to fill in our stack and heap. \
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Don't wait forever here. If our parent dies we don't want to clog \
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the system. If the wait fails, we really can't continue so exit. */ \
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DWORD psync_rc = WaitForSingleObject (child_proc_info->forker_finished, FORK_WAIT_TIMEOUT); \
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switch (psync_rc) \
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{ \
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case WAIT_TIMEOUT: \
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api_fatal ("sync_with_parent - WFSO timed out"); \
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break; \
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case WAIT_FAILED: \
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if (GetLastError () == ERROR_INVALID_HANDLE && \
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WaitForSingleObject (child_proc_info->forker_finished, 1) != WAIT_FAILED) \
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break; \
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api_fatal ("sync_with_parent - WFSO failed, fork_finished %p, %E", child_proc_info->forker_finished); \
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break; \
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default: \
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break; \
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} \
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debug_printf ("awake"); \
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} \
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0; \
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}))
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static volatile void grow_stack_slack();
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static void *
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stack_dummy (int here)
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{
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return &here;
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}
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extern "C" int
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fork ()
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{
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int res;
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DWORD rc;
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HANDLE hParent;
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pinfo *child;
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HANDLE subproc_ready, forker_finished;
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void *stack_here;
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int x;
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PROCESS_INFORMATION pi = {0, NULL, 0, 0};
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MALLOC_CHECK;
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/* FIXME: something is broken when copying the stack from the parent
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to the child; we try various tricks here to make sure that the
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stack is good enough to prevent page faults, but the true cause
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is still unknown. DJ */
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volatile char dummy[4096];
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dummy[0] = dummy[4095] = 0; // Just to leave some slack in the stack
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grow_stack_slack ();
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debug_printf ("entering");
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/* Calculate how much of stack to copy to child */
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stack_here = stack_dummy (0);
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if (ISSTATE(myself, PID_SPLIT_HEAP))
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{
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system_printf ("The heap has been split, CYGWIN can't fork this process.");
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system_printf ("Increase the heap_chunk_size in the registry and try again.");
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set_errno (ENOMEM);
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syscall_printf ("-1 = fork (), split heap");
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return -1;
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}
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/* Don't start the fork until we have the lock. */
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child = cygwin_shared->p.allocate_pid ();
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if (!child)
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{
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set_errno (EAGAIN);
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syscall_printf ("-1 = fork (), process table full");
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return -1;
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}
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static child_info_fork ch;
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x = setjmp (ch.jmp);
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if (x == 0)
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{
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/* This will help some of the confusion. */
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fflush (stdout);
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debug_printf ("parent pid %d, child pid %d", myself->pid, child->pid);
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subproc_ready = CreateEvent (&sec_all, FALSE, FALSE, NULL);
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forker_finished = CreateEvent (&sec_all, FALSE, FALSE, NULL);
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ProtectHandle (subproc_ready);
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ProtectHandle (forker_finished);
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/* If we didn't obtain all the resources we need to fork, allow the program
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to continue, but record the fact that fork won't work. */
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if (forker_finished == NULL || subproc_ready == NULL)
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{
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system_printf ("unable to allocate fork() resources.");
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system_printf ("fork() disabled.");
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return -1;
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}
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subproc_init ();
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debug_printf ("about to call setjmp");
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/* Parent. */
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#ifdef DEBUGGING
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/* The ProtectHandle call allocates memory so we need to make sure
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that enough is set aside here so that the sbrk pointer does not
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move when ProtectHandle is called after the child is started.
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Otherwise the sbrk pointers in the parent will not agree with
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the child and when user_data is (regrettably) copied over,
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the user_data->ptr field will not be accurate. */
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free (malloc (4096));
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#endif
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init_child_info (PROC_FORK1, &ch, child->pid, subproc_ready);
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ch.forker_finished = forker_finished;
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ch.heaptop = user_data->heaptop;
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ch.heapbase = user_data->heapbase;
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ch.heapptr = user_data->heapptr;
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stack_base (ch);
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/* Initialize things that are done later in dll_crt0_1 that aren't done
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for the forkee. */
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strcpy(child->progname, myself->progname);
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STARTUPINFO si = {0, NULL, NULL, NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL};
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si.cb = sizeof (STARTUPINFO);
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si.lpReserved2 = (LPBYTE)&ch;
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si.cbReserved2 = sizeof(ch);
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int c_flags = GetPriorityClass (hMainProc) /*|
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CREATE_NEW_PROCESS_GROUP*/;
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/* If we don't have a console, then don't create a console for the
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child either. */
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HANDLE console_handle = CreateFileA ("CONOUT$", GENERIC_WRITE,
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FILE_SHARE_WRITE, &sec_none_nih,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
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NULL);
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syscall_printf ("CreateProcessA (%s, %s,0,0,1,%x, 0,0,%p,%p)",
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myself->progname, myself->progname, c_flags, &si, &pi);
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if (console_handle != INVALID_HANDLE_VALUE && console_handle != 0)
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CloseHandle (console_handle);
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else
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c_flags |= DETACHED_PROCESS;
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hParent = NULL;
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if (!DuplicateHandle (hMainProc, hMainProc, hMainProc, &hParent, 0, 1,
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DUPLICATE_SAME_ACCESS))
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{
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system_printf ("couldn't create handle to myself for child, %E");
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goto cleanup;
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}
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rc = CreateProcessA (myself->progname, /* image to run */
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myself->progname, /* what we send in arg0 */
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&sec_none_nih, /* process security attrs */
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&sec_none_nih, /* thread security attrs */
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TRUE, /* inherit handles from parent */
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c_flags,
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NULL, /* environment filled in later */
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0, /* use current drive/directory */
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&si,
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&pi);
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CloseHandle (hParent);
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if (!rc)
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{
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__seterrno ();
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syscall_printf ("-1 = fork(), CreateProcessA failed");
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child->process_state = PID_NOT_IN_USE;
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ForceCloseHandle(subproc_ready);
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ForceCloseHandle(forker_finished);
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subproc_ready = forker_finished = NULL;
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return -1;
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}
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ProtectHandle (pi.hThread);
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/* Protect the handle but name it similarly to the way it will
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be called in subproc handling. */
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ProtectHandle1 (pi.hProcess, childhProc);
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/* Fill in fields in the child's process table entry. */
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child->ppid = myself->pid;
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child->hProcess = pi.hProcess;
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child->dwProcessId = pi.dwProcessId;
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child->uid = myself->uid;
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child->gid = myself->gid;
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child->pgid = myself->pgid;
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child->sid = myself->sid;
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child->ctty = myself->ctty;
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child->umask = myself->umask;
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child->copysigs(myself);
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child->process_state |= PID_INITIALIZING |
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(myself->process_state & PID_USETTY);
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memcpy (child->username, myself->username, MAX_USER_NAME);
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child->psid = myself->psid;
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memcpy (child->sidbuf, myself->sidbuf, 40);
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memcpy (child->logsrv, myself->logsrv, 256);
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memcpy (child->domain, myself->domain, MAX_COMPUTERNAME_LENGTH+1);
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set_child_mmap_ptr (child);
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/* Wait for subproc to initialize itself. */
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if (!sync_with_child(pi, subproc_ready, TRUE, "waiting for longjmp"))
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goto cleanup;
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/* CHILD IS STOPPED */
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debug_printf ("child is alive (but stopped)");
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/* Initialize, in order: data, bss, heap, stack, dll data, dll bss
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Note: variables marked as NO_COPY will not be copied
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since they are placed in a protected segment. */
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MALLOC_CHECK;
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rc = fork_copy (pi, "user/cygwin data",
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user_data->data_start, user_data->data_end,
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user_data->bss_start, user_data->bss_end,
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ch.heapbase, ch.heapptr,
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stack_here, ch.stackbottom,
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dll_data_start, dll_data_end,
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dll_bss_start, dll_bss_end, NULL);
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MALLOC_CHECK;
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if (!rc)
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goto cleanup;
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/* Now fill data/bss of linked dll */
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DO_LINKED_DLL (p)
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{
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debug_printf ("copying data/bss of a linked dll");
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if (!fork_copy (pi, "linked dll data/bss", p->data_start, p->data_end,
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p->bss_start, p->bss_end,
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NULL))
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goto cleanup;
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}
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DLL_DONE;
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proc_register (child);
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int load_dll = DllList::the().forkeeMustReloadDlls() &&
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DllList::the().numberOfOpenedDlls();
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/* Start thread, and wait for it to reload dlls. */
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if (!resume_child (pi, forker_finished) ||
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!sync_with_child (pi, subproc_ready, load_dll, "child loading dlls"))
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goto cleanup;
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/* child reload dlls & then write their data and bss */
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if (load_dll)
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{
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/* CHILD IS STOPPED */
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/* write memory of reloaded dlls */
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DO_LOADED_DLL (p)
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{
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debug_printf ("copying data/bss for a loaded dll");
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if (!fork_copy (pi, "loaded dll data/bss", p->data_start, p->data_end,
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p->bss_start, p->bss_end,
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NULL))
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goto cleanup;
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}
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DLL_DONE;
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/* Start the child up again. */
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(void) resume_child (pi, forker_finished);
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}
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ForceCloseHandle (subproc_ready);
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ForceCloseHandle (pi.hThread);
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ForceCloseHandle (forker_finished);
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forker_finished = NULL;
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pi.hThread = NULL;
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res = child->pid;
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}
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else
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{
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/**** Child *****/
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/* We arrive here via a longjmp from "crt0". */
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(void) stack_dummy (0); // Just to make sure
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debug_printf ("child is running %d", x);
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debug_printf ("self %p, pid %d, ppid %d",
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myself, x, myself ? myself->ppid : -1);
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sync_with_parent ("after longjmp.", TRUE);
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ProtectHandle (hParent);
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#ifdef DEBUGGING
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char c;
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if (GetEnvironmentVariable ("FORKDEBUG", &c, 1))
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try_to_debug ();
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#endif
|
|
|
|
/* If we've played with the stack, stacksize != 0. That means that
|
|
fork() was invoked from other than the main thread. Make sure that
|
|
when the "main" thread exits it calls do_exit, like a normal process.
|
|
Exit with a status code of 0. */
|
|
if (child_proc_info->stacksize)
|
|
{
|
|
((DWORD *)child_proc_info->stackbottom)[-17] = (DWORD)do_exit;
|
|
((DWORD *)child_proc_info->stackbottom)[-15] = (DWORD)0;
|
|
}
|
|
|
|
MALLOC_CHECK;
|
|
|
|
dtable.fixup_after_fork (hParent);
|
|
ForceCloseHandle (hParent);
|
|
|
|
MALLOC_CHECK;
|
|
|
|
/* reload dlls if necessary */
|
|
if (!DllList::the().forkeeMustReloadDlls() ||
|
|
!DllList::the().numberOfOpenedDlls())
|
|
sync_with_parent ("performed fork fixup.", FALSE);
|
|
else
|
|
{
|
|
DllList::the().forkeeLoadDlls();
|
|
sync_with_parent ("loaded dlls", TRUE);
|
|
}
|
|
|
|
(void) ForceCloseHandle (child_proc_info->subproc_ready);
|
|
(void) ForceCloseHandle (child_proc_info->forker_finished);
|
|
|
|
if (recreate_mmaps_after_fork (myself->mmap_ptr))
|
|
api_fatal ("recreate_mmaps_after_fork_failed");
|
|
|
|
res = 0;
|
|
/* Set thread local stuff to zero. Under Windows 95/98 this is sometimes
|
|
non-zero, for some reason.
|
|
FIXME: There is a memory leak here after a fork. */
|
|
for (per_thread **t = threadstuff; *t; t++)
|
|
if ((*t)->clear_on_fork ())
|
|
(*t)->set ();
|
|
|
|
/* Initialize signal/process handling */
|
|
sigproc_init ();
|
|
}
|
|
|
|
|
|
MALLOC_CHECK;
|
|
syscall_printf ("%d = fork()", res);
|
|
return res;
|
|
|
|
/* Common cleanup code for failure cases */
|
|
cleanup:
|
|
/* Remember to de-allocate the fd table. */
|
|
child->process_state = PID_NOT_IN_USE;
|
|
if (pi.hProcess)
|
|
ForceCloseHandle1 (pi.hProcess, childhProc);
|
|
if (pi.hThread)
|
|
ForceCloseHandle (pi.hThread);
|
|
if (subproc_ready)
|
|
ForceCloseHandle (subproc_ready);
|
|
if (forker_finished)
|
|
ForceCloseHandle (forker_finished);
|
|
forker_finished = subproc_ready = child->hProcess = NULL;
|
|
return -1;
|
|
}
|
|
|
|
static volatile void
|
|
grow_stack_slack ()
|
|
{
|
|
volatile char dummy[16384];
|
|
dummy[0] = dummy[16383] = 0; // Just to make some slack in the stack
|
|
}
|
|
|
|
#ifdef NEWVFORK
|
|
/* Dummy function to force second assignment below to actually be
|
|
carried out */
|
|
static vfork_save *
|
|
get_vfork_val ()
|
|
{
|
|
return vfork_storage.val ();
|
|
}
|
|
#endif
|
|
|
|
extern "C"
|
|
int
|
|
vfork ()
|
|
{
|
|
#ifndef NEWVFORK
|
|
return fork ();
|
|
#else
|
|
vfork_save *vf = get_vfork_val ();
|
|
|
|
if (vf == NULL)
|
|
vf = vfork_storage.create ();
|
|
|
|
if (!setjmp (vf->j))
|
|
{
|
|
vf->pid = -1;
|
|
__asm__ volatile ("movl %%ebp,%0": "=r" (vf->vfork_ebp):);
|
|
__asm__ volatile ("movl (%%ebp),%0": "=r" (vf->caller_ebp):);
|
|
__asm__ volatile ("movl 4(%%ebp),%0": "=r" (vf->retaddr):);
|
|
return dtable.vfork_child_dup () ? 0 : -1;
|
|
}
|
|
|
|
dtable.vfork_parent_restore ();
|
|
|
|
vf = get_vfork_val ();
|
|
if (vf->pid < 0)
|
|
{
|
|
int exitval = -vf->pid;
|
|
if ((vf->pid = fork ()) == 0)
|
|
exit (exitval);
|
|
}
|
|
|
|
vf->vfork_ebp[0] = vf->caller_ebp;
|
|
vf->vfork_ebp[1] = vf->retaddr;
|
|
return vf->pid;
|
|
#endif
|
|
}
|