48755fb9bc
So far we copy *_impure_ptr into _main_tls->local_clib if the child process has been forked from a pthread. But that's not required. The local_clib area of the new thread is on the stack and the stack gets copied from the parent anyway (in frok::parent). So we only have to make sure _main_tls is pointing to the right address and do the simple post-fork thread init. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
700 lines
20 KiB
C++
700 lines
20 KiB
C++
/* fork.cc
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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 <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "cygerrno.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "child_info.h"
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#include "cygtls.h"
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#include "tls_pbuf.h"
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#include "dll_init.h"
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#include "cygmalloc.h"
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#include "ntdll.h"
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#define NPIDS_HELD 4
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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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class frok
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{
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bool load_dlls;
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child_info_fork ch;
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const char *errmsg;
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int child_pid;
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int this_errno;
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HANDLE hchild;
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int __stdcall parent (volatile char * volatile here);
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int __stdcall child (volatile char * volatile here);
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bool error (const char *fmt, ...);
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friend int fork ();
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};
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static void
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resume_child (HANDLE forker_finished)
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{
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SetEvent (forker_finished);
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debug_printf ("signalled child");
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return;
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}
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/* Notify parent that it is time for the next step. */
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static void __stdcall
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sync_with_parent (const char *s, bool hang_self)
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{
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debug_printf ("signalling parent: %s", s);
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fork_info->ready (false);
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if (hang_self)
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{
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HANDLE h = fork_info->forker_finished;
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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 (h, FORK_WAIT_TIMEOUT);
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debug_printf ("awake");
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switch (psync_rc)
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{
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case WAIT_TIMEOUT:
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api_fatal ("WFSO timed out %s", s);
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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 (fork_info->forker_finished, 1) != WAIT_FAILED)
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break;
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api_fatal ("WFSO failed %s, fork_finished %p, %E", s,
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fork_info->forker_finished);
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break;
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default:
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debug_printf ("no problems");
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break;
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}
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}
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}
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bool
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frok::error (const char *fmt, ...)
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{
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DWORD exit_code = ch.exit_code;
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if (!exit_code && hchild)
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{
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exit_code = ch.proc_retry (hchild);
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if (!exit_code)
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return false;
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}
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if (exit_code != EXITCODE_FORK_FAILED)
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{
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va_list ap;
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static char buf[NT_MAX_PATH + 256];
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va_start (ap, fmt);
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__small_vsprintf (buf, fmt, ap);
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errmsg = buf;
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}
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return true;
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}
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/* Set up a pipe which will track the life of a "pid" through
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even after we've exec'ed. */
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void
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child_info::prefork (bool detached)
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{
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if (!detached)
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{
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if (!CreatePipe (&rd_proc_pipe, &wr_proc_pipe, &sec_none_nih, 16))
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api_fatal ("prefork: couldn't create pipe process tracker, %E");
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if (!SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT,
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HANDLE_FLAG_INHERIT))
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api_fatal ("prefork: couldn't set process pipe(%p) inherit state, %E",
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wr_proc_pipe);
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ProtectHandle1 (rd_proc_pipe, rd_proc_pipe);
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ProtectHandle1 (wr_proc_pipe, wr_proc_pipe);
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}
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}
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int __stdcall
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frok::child (volatile char * volatile here)
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{
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HANDLE& hParent = ch.parent;
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extern void fixup_hooks_after_fork ();
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extern void fixup_timers_after_fork ();
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/* NOTE: Logically this belongs in dll_list::load_after_fork, but by
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doing it here, before the first sync_with_parent, we can exploit
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the existing retry mechanism in hopes of getting a more favorable
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address space layout next time. */
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dlls.reserve_space ();
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sync_with_parent ("after longjmp", true);
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debug_printf ("child is running. pid %d, ppid %d, stack here %p",
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myself->pid, myself->ppid, __builtin_frame_address (0));
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sigproc_printf ("hParent %p, load_dlls %d", hParent, load_dlls);
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/* Make sure threadinfo information is properly set up. */
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if (&_my_tls != _main_tls)
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{
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_main_tls = &_my_tls;
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_main_tls->init_thread (NULL, NULL);
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}
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set_cygwin_privileges (hProcToken);
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clear_procimptoken ();
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cygheap->user.reimpersonate ();
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#ifdef DEBUGGING
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if (GetEnvironmentVariableA ("FORKDEBUG", NULL, 0))
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try_to_debug ();
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char buf[80];
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/* This is useful for debugging fork problems. Use gdb to attach to
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the pid reported here. */
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if (GetEnvironmentVariableA ("CYGWIN_FORK_SLEEP", buf, sizeof (buf)))
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{
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small_printf ("Sleeping %d after fork, pid %u\n", atoi (buf), GetCurrentProcessId ());
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Sleep (atoi (buf));
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}
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#endif
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/* Incredible but true: If we use sockets and SYSV IPC shared memory,
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there's a good chance that a duplicated socket in the child occupies
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memory which is needed to duplicate shared memory from the parent
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process, if the shared memory hasn't been duplicated already.
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The same goes very likely for "normal" mmap shared memory, too, but
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with SYSV IPC it was the first time observed. So, *never* fixup
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fdtab before fixing up shared memory. */
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if (fixup_shms_after_fork ())
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api_fatal ("recreate_shm areas after fork failed");
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/* If we haven't dynamically loaded any dlls, just signal
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the parent. Otherwise, load all the dlls, tell the parent
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that we're done, and wait for the parent to fill in the.
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loaded dlls' data/bss. */
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if (!load_dlls)
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{
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cygheap->fdtab.fixup_after_fork (hParent);
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sync_with_parent ("performed fork fixup", false);
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}
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else
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{
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dlls.load_after_fork (hParent);
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cygheap->fdtab.fixup_after_fork (hParent);
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sync_with_parent ("loaded dlls", true);
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}
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init_console_handler (myself->ctty > 0);
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ForceCloseHandle1 (fork_info->forker_finished, forker_finished);
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pthread::atforkchild ();
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fixup_timers_after_fork ();
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cygbench ("fork-child");
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ld_preload ();
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fixup_hooks_after_fork ();
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_my_tls.fixup_after_fork ();
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/* Clear this or the destructor will close them. In the case of
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rd_proc_pipe that would be an invalid handle. In the case of
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wr_proc_pipe it would be == my_wr_proc_pipe. Both would be bad. */
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ch.rd_proc_pipe = ch.wr_proc_pipe = NULL;
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cygwin_finished_initializing = true;
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return 0;
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}
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#define NO_SLOW_PID_REUSE
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#ifndef NO_SLOW_PID_REUSE
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static void
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slow_pid_reuse (HANDLE h)
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{
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static NO_COPY HANDLE last_fork_procs[NPIDS_HELD];
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static NO_COPY unsigned nfork_procs;
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if (nfork_procs >= (sizeof (last_fork_procs) / sizeof (last_fork_procs [0])))
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nfork_procs = 0;
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/* Keep a list of handles to child processes sitting around to prevent
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Windows from reusing the same pid n times in a row. Having the same pids
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close in succesion confuses bash. Keeping a handle open will stop
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windows from reusing the same pid. */
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if (last_fork_procs[nfork_procs])
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ForceCloseHandle1 (last_fork_procs[nfork_procs], fork_stupidity);
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if (DuplicateHandle (GetCurrentProcess (), h,
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GetCurrentProcess (), &last_fork_procs[nfork_procs],
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0, FALSE, DUPLICATE_SAME_ACCESS))
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ProtectHandle1 (last_fork_procs[nfork_procs], fork_stupidity);
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else
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{
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last_fork_procs[nfork_procs] = NULL;
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system_printf ("couldn't create last_fork_proc, %E");
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}
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nfork_procs++;
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}
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#endif
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int __stdcall
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frok::parent (volatile char * volatile stack_here)
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{
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HANDLE forker_finished;
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DWORD rc;
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child_pid = -1;
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this_errno = 0;
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bool fix_impersonation = false;
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pinfo child;
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int c_flags = GetPriorityClass (GetCurrentProcess ());
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debug_printf ("priority class %d", c_flags);
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/* Per MSDN, this must be specified even if lpEnvironment is set to NULL,
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otherwise UNICODE characters in the parent environment are not copied
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correctly to the child. Omitting it may scramble %PATH% on non-English
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systems. */
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c_flags |= CREATE_UNICODE_ENVIRONMENT;
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errmsg = NULL;
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hchild = NULL;
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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 = CreateFile ("CONOUT$", GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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&sec_none_nih, OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, NULL);
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if (console_handle != INVALID_HANDLE_VALUE)
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CloseHandle (console_handle);
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else
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c_flags |= DETACHED_PROCESS;
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/* Some file types (currently only sockets) need extra effort in the
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parent after CreateProcess and before copying the datastructures
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to the child. So we have to start the child in suspend state,
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unfortunately, to avoid a race condition. */
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if (cygheap->fdtab.need_fixup_before ())
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c_flags |= CREATE_SUSPENDED;
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/* Remember if we need to load dynamically linked dlls.
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We do this here so that this information will be available
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in the parent and, when the stack is copied, in the child. */
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load_dlls = dlls.reload_on_fork && dlls.loaded_dlls;
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forker_finished = CreateEvent (&sec_all, FALSE, FALSE, NULL);
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if (forker_finished == NULL)
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{
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this_errno = geterrno_from_win_error ();
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error ("unable to allocate forker_finished event");
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return -1;
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}
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ProtectHandleINH (forker_finished);
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ch.forker_finished = forker_finished;
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ch.stackbase = NtCurrentTeb ()->Tib.StackBase;
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ch.stackaddr = NtCurrentTeb ()->DeallocationStack;
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if (!ch.stackaddr)
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{
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/* If DeallocationStack is NULL, we're running on an application-provided
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stack. If so, the entire stack is committed anyway and StackLimit
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points to the allocation address of the stack. Mark in guardsize that
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we must not set up guard pages. */
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ch.stackaddr = ch.stacklimit = NtCurrentTeb ()->Tib.StackLimit;
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ch.guardsize = (size_t) -1;
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}
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else
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{
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/* Otherwise we're running on a system-allocated stack. Since stack_here
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is the address of the stack pointer we start the child with anyway, we
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can set ch.stacklimit to this value rounded down to page size. The
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child will not need the rest of the stack anyway. Guardsize depends
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on whether we're running on a pthread or not. If pthread, we fetch
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the guardpage size from the pthread attribs, otherwise we use the
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system default. */
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ch.stacklimit = (void *) ((uintptr_t) stack_here & ~wincap.page_size ());
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ch.guardsize = (&_my_tls != _main_tls && _my_tls.tid)
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? _my_tls.tid->attr.guardsize
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: wincap.def_guard_page_size ();
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}
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debug_printf ("stack - bottom %p, top %p, addr %p, guardsize %ly",
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ch.stackbase, ch.stacklimit, ch.stackaddr, ch.guardsize);
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PROCESS_INFORMATION pi;
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STARTUPINFOW si;
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memset (&si, 0, sizeof (si));
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si.cb = sizeof si;
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si.lpReserved2 = (LPBYTE) &ch;
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si.cbReserved2 = sizeof (ch);
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syscall_printf ("CreateProcessW (%W, %W, 0, 0, 1, %y, 0, 0, %p, %p)",
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myself->progname, myself->progname, c_flags, &si, &pi);
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bool locked = __malloc_lock ();
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/* Remove impersonation */
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cygheap->user.deimpersonate ();
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fix_impersonation = true;
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ch.refresh_cygheap ();
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ch.prefork (); /* set up process tracking pipes. */
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while (1)
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{
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hchild = NULL;
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rc = CreateProcessW (myself->progname, /* image to run */
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GetCommandLineW (), /* Take same space for command
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line as in parent to make
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sure child stack is allocated
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in the same memory location
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as in parent. */
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&sec_none_nih,
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&sec_none_nih,
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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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if (rc)
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debug_printf ("forked pid %u", pi.dwProcessId);
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else
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{
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this_errno = geterrno_from_win_error ();
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error ("CreateProcessW failed for '%W'", myself->progname);
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memset (&pi, 0, sizeof (pi));
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goto cleanup;
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}
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if (cygheap->fdtab.need_fixup_before ())
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{
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cygheap->fdtab.fixup_before_fork (pi.dwProcessId);
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ResumeThread (pi.hThread);
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}
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CloseHandle (pi.hThread);
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hchild = pi.hProcess;
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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 (hchild, childhProc);
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strace.write_childpid (pi.dwProcessId);
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/* Wait for subproc to initialize itself. */
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if (!ch.sync (pi.dwProcessId, hchild, FORK_WAIT_TIMEOUT))
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{
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if (!error ("forked process %u died unexpectedly, retry %d, exit code %y",
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pi.dwProcessId, ch.retry, ch.exit_code))
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continue;
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this_errno = EAGAIN;
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goto cleanup;
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}
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break;
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}
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/* Restore impersonation */
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cygheap->user.reimpersonate ();
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fix_impersonation = false;
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child_pid = cygwin_pid (pi.dwProcessId);
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child.init (child_pid, PID_IN_USE | PID_NEW, NULL);
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if (!child)
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{
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this_errno = get_errno () == ENOMEM ? ENOMEM : EAGAIN;
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syscall_printf ("pinfo failed");
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goto cleanup;
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}
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child->nice = myself->nice;
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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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wcscpy (child->progname, myself->progname);
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/* Fill in fields in the child's process table entry. */
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child->dwProcessId = pi.dwProcessId;
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child.hProcess = hchild;
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ch.postfork (child);
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/* Hopefully, this will succeed. The alternative to doing things this
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way is to reserve space prior to calling CreateProcess and then fill
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it in afterwards. This requires more bookkeeping than I like, though,
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so we'll just do it the easy way. So, terminate any child process if
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we can't actually record the pid in the internal table. */
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if (!child.remember (false))
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{
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TerminateProcess (hchild, 1);
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this_errno = EAGAIN;
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#ifdef DEBUGGING0
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error ("child remember failed");
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#endif
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goto cleanup;
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}
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|
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#ifndef NO_SLOW_PID_REUSE
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slow_pid_reuse (hchild);
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#endif
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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: stack, dll data, dll bss.
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data, bss, heap were done earlier (in dcrt0.cc)
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Note: variables marked as NO_COPY will not be copied since they are
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placed in a protected segment. */
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const void *impure_beg;
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const void *impure_end;
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const char *impure;
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if (&_my_tls == _main_tls)
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impure_beg = impure_end = impure = NULL;
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else
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{
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impure = "impure";
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impure_beg = _impure_ptr;
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impure_end = _impure_ptr + 1;
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}
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rc = child_copy (hchild, true,
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"stack", stack_here, ch.stackbase,
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impure, impure_beg, impure_end,
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NULL);
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__malloc_unlock ();
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locked = false;
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if (!rc)
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{
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this_errno = get_errno ();
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error ("pid %u, exitval %p", pi.dwProcessId, ch.exit_code);
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goto cleanup;
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}
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/* Now fill data/bss of any DLLs that were linked into the program. */
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for (dll *d = dlls.istart (DLL_LINK); d; d = dlls.inext ())
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{
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debug_printf ("copying data/bss of a linked dll");
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if (!child_copy (hchild, true,
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"linked dll data", d->p.data_start, d->p.data_end,
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"linked dll bss", d->p.bss_start, d->p.bss_end,
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NULL))
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{
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this_errno = get_errno ();
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error ("couldn't copy linked dll data/bss");
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goto cleanup;
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}
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}
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/* Start thread, and then wait for it to reload dlls. */
|
|
resume_child (forker_finished);
|
|
if (!ch.sync (child->pid, hchild, FORK_WAIT_TIMEOUT))
|
|
{
|
|
this_errno = EAGAIN;
|
|
error ("died waiting for dll loading");
|
|
goto cleanup;
|
|
}
|
|
|
|
/* If DLLs were loaded in the parent, then the child has reloaded all
|
|
of them and is now waiting to have all of the individual data and
|
|
bss sections filled in. */
|
|
if (load_dlls)
|
|
{
|
|
/* CHILD IS STOPPED */
|
|
/* write memory of reloaded dlls */
|
|
for (dll *d = dlls.istart (DLL_LOAD); d; d = dlls.inext ())
|
|
{
|
|
debug_printf ("copying data/bss for a loaded dll");
|
|
if (!child_copy (hchild, true,
|
|
"loaded dll data", d->p.data_start, d->p.data_end,
|
|
"loaded dll bss", d->p.bss_start, d->p.bss_end,
|
|
NULL))
|
|
{
|
|
this_errno = get_errno ();
|
|
#ifdef DEBUGGING
|
|
error ("copying data/bss for a loaded dll");
|
|
#endif
|
|
goto cleanup;
|
|
}
|
|
}
|
|
/* Start the child up again. */
|
|
resume_child (forker_finished);
|
|
}
|
|
|
|
ForceCloseHandle (forker_finished);
|
|
forker_finished = NULL;
|
|
|
|
return child_pid;
|
|
|
|
/* Common cleanup code for failure cases */
|
|
cleanup:
|
|
if (fix_impersonation)
|
|
cygheap->user.reimpersonate ();
|
|
if (locked)
|
|
__malloc_unlock ();
|
|
|
|
/* Remember to de-allocate the fd table. */
|
|
if (hchild && !child.hProcess)
|
|
ForceCloseHandle1 (hchild, childhProc);
|
|
if (forker_finished)
|
|
ForceCloseHandle (forker_finished);
|
|
debug_printf ("returning -1");
|
|
return -1;
|
|
}
|
|
|
|
extern "C" int
|
|
fork ()
|
|
{
|
|
frok grouped;
|
|
|
|
debug_printf ("entering");
|
|
grouped.load_dlls = 0;
|
|
|
|
int res;
|
|
bool ischild = false;
|
|
|
|
myself->set_has_pgid_children ();
|
|
|
|
if (grouped.ch.parent == NULL)
|
|
return -1;
|
|
if (grouped.ch.subproc_ready == NULL)
|
|
{
|
|
system_printf ("unable to allocate subproc_ready event, %E");
|
|
return -1;
|
|
}
|
|
|
|
{
|
|
hold_everything held_everything (ischild);
|
|
/* This tmp_pathbuf constructor is required here because the below setjmp
|
|
magic will otherwise not restore the original buffer count values in
|
|
the thread-local storage. A process forking too deeply will run into
|
|
the problem to be out of temporary TLS path buffers. */
|
|
tmp_pathbuf tp;
|
|
|
|
if (!held_everything)
|
|
{
|
|
if (exit_state)
|
|
Sleep (INFINITE);
|
|
set_errno (EAGAIN);
|
|
return -1;
|
|
}
|
|
|
|
/* Put the dll list in topological dependency ordering, in
|
|
hopes that the child will have a better shot at loading dlls
|
|
properly if it only has to deal with one at a time. */
|
|
dlls.topsort ();
|
|
|
|
ischild = !!setjmp (grouped.ch.jmp);
|
|
|
|
volatile char * volatile stackp;
|
|
#ifdef __x86_64__
|
|
__asm__ volatile ("movq %%rsp,%0": "=r" (stackp));
|
|
#else
|
|
__asm__ volatile ("movl %%esp,%0": "=r" (stackp));
|
|
#endif
|
|
|
|
if (!ischild)
|
|
res = grouped.parent (stackp);
|
|
else
|
|
{
|
|
res = grouped.child (stackp);
|
|
in_forkee = false;
|
|
ischild = true; /* might have been reset by fork mem copy */
|
|
}
|
|
}
|
|
|
|
if (ischild)
|
|
{
|
|
myself->process_state |= PID_ACTIVE;
|
|
myself->process_state &= ~(PID_INITIALIZING | PID_EXITED | PID_REAPED);
|
|
}
|
|
else if (res < 0)
|
|
{
|
|
if (!grouped.errmsg)
|
|
syscall_printf ("fork failed - child pid %d, errno %d", grouped.child_pid, grouped.this_errno);
|
|
else
|
|
{
|
|
char buf[strlen (grouped.errmsg) + sizeof ("child %d - , errno 4294967295 ")];
|
|
strcpy (buf, "child %d - ");
|
|
strcat (buf, grouped.errmsg);
|
|
strcat (buf, ", errno %d");
|
|
system_printf (buf, grouped.child_pid, grouped.this_errno);
|
|
}
|
|
|
|
set_errno (grouped.this_errno);
|
|
}
|
|
syscall_printf ("%R = fork()", res);
|
|
return res;
|
|
}
|
|
#ifdef DEBUGGING
|
|
void
|
|
fork_init ()
|
|
{
|
|
}
|
|
#endif /*DEBUGGING*/
|
|
|
|
|
|
extern "C" int
|
|
vfork ()
|
|
{
|
|
debug_printf ("stub called");
|
|
return fork ();
|
|
}
|
|
|
|
/* Copy memory from one process to another. */
|
|
|
|
bool
|
|
child_copy (HANDLE hp, bool write, ...)
|
|
{
|
|
va_list args;
|
|
va_start (args, write);
|
|
static const char *huh[] = {"read", "write"};
|
|
|
|
char *what;
|
|
while ((what = va_arg (args, char *)))
|
|
{
|
|
char *low = va_arg (args, char *);
|
|
char *high = va_arg (args, char *);
|
|
SIZE_T todo = high - low;
|
|
char *here;
|
|
|
|
for (here = low; here < high; here += todo)
|
|
{
|
|
SIZE_T done = 0;
|
|
if (here + todo > high)
|
|
todo = high - here;
|
|
BOOL res;
|
|
if (write)
|
|
res = WriteProcessMemory (hp, here, here, todo, &done);
|
|
else
|
|
res = ReadProcessMemory (hp, here, here, todo, &done);
|
|
debug_printf ("%s - hp %p low %p, high %p, res %d", what, hp, low, high, res);
|
|
if (!res || todo != done)
|
|
{
|
|
if (!res)
|
|
__seterrno ();
|
|
/* If this happens then there is a bug in our fork
|
|
implementation somewhere. */
|
|
system_printf ("%s %s copy failed, %p..%p, done %lu, windows pid %u, %E",
|
|
what, huh[write], low, high, done, myself->dwProcessId);
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
|
|
va_end (args);
|
|
debug_printf ("done");
|
|
return true;
|
|
|
|
err:
|
|
va_end (args);
|
|
TerminateProcess (hp, 1);
|
|
set_errno (EAGAIN);
|
|
return false;
|
|
}
|