1294 lines
32 KiB
C++
1294 lines
32 KiB
C++
/* pinfo.cc: process table support
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Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
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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 "miscfuncs.h"
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#include <stdlib.h>
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#include "cygerrno.h"
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#include "security.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 "sigproc.h"
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#include "pinfo.h"
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#include "perprocess.h"
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#include "environ.h"
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#include <assert.h>
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#include "ntdll.h"
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#include "shared_info.h"
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#include "cygheap.h"
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#include "cygmalloc.h"
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#include "cygtls.h"
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#include "tls_pbuf.h"
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#include "child_info.h"
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class pinfo_basic: public _pinfo
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{
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public:
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pinfo_basic();
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};
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pinfo_basic::pinfo_basic()
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{
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pid = dwProcessId = GetCurrentProcessId ();
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GetModuleFileNameW (NULL, progname, sizeof (progname));
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}
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pinfo_basic myself_initial NO_COPY;
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pinfo NO_COPY myself (static_cast<_pinfo *> (&myself_initial)); // Avoid myself != NULL checks
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bool is_toplevel_proc;
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/* Setup the pinfo structure for this process. There may already be a
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_pinfo for this "pid" if h != NULL. */
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void
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pinfo::thisproc (HANDLE h)
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{
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procinfo = NULL;
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if (!h)
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cygheap->pid = cygwin_pid (myself_initial.pid);
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init (cygheap->pid, PID_IN_USE, h ?: INVALID_HANDLE_VALUE);
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procinfo->process_state |= PID_IN_USE;
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procinfo->dwProcessId = myself_initial.pid;
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procinfo->sendsig = myself_initial.sendsig;
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wcscpy (procinfo->progname, myself_initial.progname);
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strace.hello ();
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debug_printf ("myself->dwProcessId %u", procinfo->dwProcessId);
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if (h)
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{
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/* here if execed */
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static pinfo NO_COPY myself_identity;
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myself_identity.init (cygwin_pid (procinfo->dwProcessId), PID_EXECED, NULL);
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procinfo->exec_sendsig = NULL;
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procinfo->exec_dwProcessId = 0;
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}
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else if (!child_proc_info) /* child_proc_info is only set when this process
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was started by another cygwin process */
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procinfo->start_time = time (NULL); /* Register our starting time. */
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else if (cygheap->pid_handle)
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{
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ForceCloseHandle (cygheap->pid_handle);
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cygheap->pid_handle = NULL;
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}
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}
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/* Initialize the process table entry for the current task.
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This is not called for forked tasks, only execed ones. */
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void __stdcall
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pinfo_init (char **envp, int envc)
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{
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if (envp)
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{
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environ_init (envp, envc);
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/* spawn has already set up a pid structure for us so we'll use that */
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myself->process_state |= PID_CYGPARENT;
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}
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else
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{
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/* Invent our own pid. */
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myself.thisproc (NULL);
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myself->ppid = 1;
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myself->pgid = myself->sid = myself->pid;
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myself->ctty = -1;
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myself->uid = ILLEGAL_UID;
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myself->gid = UNKNOWN_GID;
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environ_init (NULL, 0); /* call after myself has been set up */
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myself->nice = winprio_to_nice (GetPriorityClass (GetCurrentProcess ()));
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debug_printf ("Set nice to %d", myself->nice);
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}
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myself->process_state |= PID_ACTIVE;
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myself->process_state &= ~(PID_INITIALIZING | PID_EXITED);
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debug_printf ("pid %d, pgid %d", myself->pid, myself->pgid);
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}
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static DWORD
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status_exit (DWORD x)
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{
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const char *find_first_notloaded_dll (path_conv &);
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switch (x)
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{
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case STATUS_DLL_NOT_FOUND:
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{
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char posix_prog[NT_MAX_PATH];
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UNICODE_STRING uc;
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RtlInitUnicodeString(&uc, myself->progname);
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path_conv pc (&uc, PC_NOWARN);
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mount_table->conv_to_posix_path (pc.get_win32 (), posix_prog, 1);
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small_printf ("%s: error while loading shared libraries: %s: cannot open shared object file: No such file or directory\n",
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posix_prog, find_first_notloaded_dll (pc));
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x = 127;
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}
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break;
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case STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION: /* custom error value */
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/* We've already printed the error message in pseudo-reloc.c */
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x = 127;
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break;
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default:
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debug_printf ("*** STATUS_%p\n", x);
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x = 127;
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}
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return x;
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}
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# define self (*this)
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void
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pinfo::set_exit_code (DWORD x)
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{
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if (x >= 0xc0000000UL)
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x = status_exit (x);
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self->exitcode = EXITCODE_SET | (sigExeced ?: (x & 0xff) << 8);
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}
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void
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pinfo::maybe_set_exit_code_from_windows ()
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{
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DWORD x = 0xdeadbeef;
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DWORD oexitcode = self->exitcode;
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if (hProcess && !(self->exitcode & EXITCODE_SET))
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{
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WaitForSingleObject (hProcess, INFINITE); /* just to be safe, in case
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process hasn't quite exited
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after closing pipe */
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GetExitCodeProcess (hProcess, &x);
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set_exit_code (x);
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}
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sigproc_printf ("pid %d, exit value - old %p, windows %p, cygwin %p",
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self->pid, oexitcode, x, self->exitcode);
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}
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void
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pinfo::exit (DWORD n)
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{
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minimal_printf ("winpid %d, exit %d", GetCurrentProcessId (), n);
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lock_process until_exit ();
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cygthread::terminate ();
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if (n != EXITCODE_NOSET)
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self->exitcode = EXITCODE_SET | n;/* We're really exiting. Record the UNIX exit code. */
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else
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{
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exit_state = ES_EXEC_EXIT;
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maybe_set_exit_code_from_windows ();
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}
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sigproc_terminate (ES_FINAL);
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if (myself->ctty >= 0 && myself->ctty != TTY_CONSOLE)
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{
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lock_ttys here;
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tty *t = cygwin_shared->tty[myself->ctty];
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if (!t->slave_alive ())
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t->setpgid (0);
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}
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/* FIXME: There is a potential race between an execed process and its
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parent here. I hated to add a mutex just for that, though. */
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struct rusage r;
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fill_rusage (&r, GetCurrentProcess ());
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add_rusage (&self->rusage_self, &r);
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int exitcode = self->exitcode & 0xffff;
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if (!self->cygstarted)
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exitcode = ((exitcode & 0xff) << 8) | ((exitcode >> 8) & 0xff);
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sigproc_printf ("Calling ExitProcess n %p, exitcode %p", n, exitcode);
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ExitProcess (exitcode);
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}
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# undef self
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void
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pinfo::init (pid_t n, DWORD flag, HANDLE h0)
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{
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shared_locations shloc;
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h = NULL;
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if (myself && !(flag & PID_EXECED)
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&& (n == myself->pid || (DWORD) n == myself->dwProcessId))
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{
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procinfo = myself;
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destroy = 0;
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return;
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}
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void *mapaddr;
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int createit = flag & (PID_IN_USE | PID_EXECED);
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DWORD access = FILE_MAP_READ
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| (flag & (PID_IN_USE | PID_EXECED | PID_MAP_RW)
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? FILE_MAP_WRITE : 0);
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if (!h0)
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shloc = (flag & (PID_IN_USE | PID_EXECED)) ? SH_JUSTCREATE : SH_JUSTOPEN;
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else
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{
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shloc = SH_MYSELF;
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if (h0 == INVALID_HANDLE_VALUE)
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h0 = NULL;
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}
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procinfo = NULL;
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PSECURITY_ATTRIBUTES sa_buf = (PSECURITY_ATTRIBUTES) alloca (1024);
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PSECURITY_ATTRIBUTES sec_attribs = sec_user_nih (sa_buf, cygheap->user.sid(),
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well_known_world_sid,
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FILE_MAP_READ);
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for (int i = 0; i < 20; i++)
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{
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DWORD mapsize;
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if (flag & PID_EXECED)
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mapsize = PINFO_REDIR_SIZE;
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else
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mapsize = sizeof (_pinfo);
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procinfo = (_pinfo *) open_shared (L"cygpid", n, h0, mapsize, &shloc,
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sec_attribs, access);
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if (!h0)
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{
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if (createit)
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__seterrno ();
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return;
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}
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if (!procinfo)
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{
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if (exit_state)
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return;
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switch (GetLastError ())
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{
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case ERROR_INVALID_HANDLE:
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api_fatal ("MapViewOfFileEx h0 %p, i %d failed, %E", h0, i);
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case ERROR_INVALID_ADDRESS:
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mapaddr = NULL;
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}
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debug_printf ("MapViewOfFileEx h0 %p, i %d failed, %E", h0, i);
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yield ();
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continue;
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}
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bool created = shloc != SH_JUSTOPEN;
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if ((procinfo->process_state & PID_INITIALIZING) && (flag & PID_NOREDIR)
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&& cygwin_pid (procinfo->dwProcessId) != procinfo->pid)
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{
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set_errno (ESRCH);
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break;
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}
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if (procinfo->process_state & PID_EXECED)
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{
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assert (i == 0);
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pid_t realpid = procinfo->pid;
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debug_printf ("execed process windows pid %d, cygwin pid %d", n, realpid);
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if (realpid == n)
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api_fatal ("retrieval of execed process info for pid %d failed due to recursion.", n);
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n = realpid;
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CloseHandle (h0);
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h0 = NULL;
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goto loop;
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}
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/* In certain pathological cases, it is possible for the shared memory
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region to exist for a while after a process has exited. This should
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only be a brief occurrence, so rather than introduce some kind of
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locking mechanism, just loop. */
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if (!created && createit && (procinfo->process_state & PID_EXITED))
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{
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debug_printf ("looping because pid %d, procinfo->pid %d, "
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"procinfo->dwProcessid %u has PID_EXITED set",
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n, procinfo->pid, procinfo->dwProcessId);
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goto loop;
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}
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if (!created)
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/* nothing */;
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else if (!(flag & PID_EXECED))
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procinfo->pid = n;
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else
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{
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procinfo->process_state |= PID_IN_USE | PID_EXECED;
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procinfo->pid = myself->pid;
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}
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h = h0; /* Success! */
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break;
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loop:
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release ();
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if (h0)
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yield ();
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}
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if (h)
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{
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destroy = 1;
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ProtectHandle1 (h, pinfo_shared_handle);
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}
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else
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{
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h = h0;
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release ();
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}
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}
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void
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pinfo::set_acl()
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{
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PACL acl_buf = (PACL) alloca (1024);
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SECURITY_DESCRIPTOR sd;
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NTSTATUS status;
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sec_acl (acl_buf, true, true, cygheap->user.sid (),
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well_known_world_sid, FILE_MAP_READ);
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if (!InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION))
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debug_printf ("InitializeSecurityDescriptor %E");
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else if (!SetSecurityDescriptorDacl (&sd, TRUE, acl_buf, FALSE))
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debug_printf ("SetSecurityDescriptorDacl %E");
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else if ((status = NtSetSecurityObject (h, DACL_SECURITY_INFORMATION, &sd)))
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debug_printf ("NtSetSecurityObject %lx", status);
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}
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const char *
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_pinfo::_ctty (char *buf)
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{
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if (ctty == TTY_CONSOLE)
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strcpy (buf, "ctty /dev/console");
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else if (ctty < 0)
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strcpy (buf, "no ctty");
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else
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__small_sprintf (buf, "ctty /dev/tty%d", ctty);
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return buf;
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}
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void
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_pinfo::set_ctty (tty_min *tc, int flags, fhandler_termios *arch)
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{
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debug_printf ("old %s", __ctty ());
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if ((ctty < 0 || ctty == tc->ntty) && !(flags & O_NOCTTY))
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{
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ctty = tc->ntty;
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lock_ttys here;
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syscall_printf ("attaching %s sid %d, pid %d, pgid %d, tty->pgid %d, tty->sid %d",
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__ctty (), sid, pid, pgid, tc->getpgid (), tc->getsid ());
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pinfo p (tc->getsid ());
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if (sid == pid && (!p || p->pid == pid || !p->exists ()))
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{
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#ifdef DEBUGGING
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debug_printf ("resetting %s sid. Was %d, now %d. pgid was %d, now %d.",
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__ctty (), tc->getsid (), sid, tc->getpgid (), pgid);
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#else
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paranoid_printf ("resetting %s sid. Was %d, now %d. pgid was %d, now %d.",
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__ctty (), tc->getsid (), sid, tc->getpgid (), pgid);
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#endif
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/* We are the session leader */
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tc->setsid (sid);
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tc->setpgid (pgid);
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}
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else
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sid = tc->getsid ();
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if (tc->getpgid () == 0)
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tc->setpgid (pgid);
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if (cygheap->ctty != arch)
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{
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debug_printf ("cygheap->ctty %p, arch %p", cygheap->ctty, arch);
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if (!cygheap->ctty)
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syscall_printf ("ctty NULL");
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else
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{
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syscall_printf ("ctty %p, usecount %d", cygheap->ctty,
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cygheap->ctty->usecount);
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cygheap->ctty->close ();
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}
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cygheap->ctty = arch;
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if (arch)
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{
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arch->usecount++;
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/* guard ctty arch */
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cygheap->manage_console_count ("_pinfo::set_ctty", 1);
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report_tty_counts (cygheap->ctty, "ctty", "");
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}
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}
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}
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debug_printf ("cygheap->ctty now %p, arch %p", cygheap->ctty, arch);
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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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_pinfo::exists ()
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{
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return this && !(process_state & PID_EXITED);
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}
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bool
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_pinfo::alive ()
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{
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HANDLE h = OpenProcess (PROCESS_QUERY_INFORMATION, false, dwProcessId);
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if (h)
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CloseHandle (h);
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return !!h;
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}
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DWORD WINAPI
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commune_process (void *arg)
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{
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siginfo_t& si = *((siginfo_t *) arg);
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tmp_pathbuf tp;
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char *path = tp.c_get ();
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DWORD nr;
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HANDLE& tothem = si._si_commune._si_write_handle;
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HANDLE process_sync =
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OpenSemaphore (SYNCHRONIZE, false, shared_name (path, "commune", si.si_pid));
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if (process_sync) // FIXME: this test shouldn't be necessary
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ProtectHandle (process_sync);
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lock_process now ();
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if (si._si_commune._si_code & PICOM_EXTRASTR)
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si._si_commune._si_str = (char *) (&si + 1);
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switch (si._si_commune._si_code)
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{
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case PICOM_CMDLINE:
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{
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sigproc_printf ("processing PICOM_CMDLINE");
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unsigned n = 0;
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const char *argv[__argc_safe + 1];
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for (int i = 0; i < __argc_safe; i++)
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{
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if (IsBadStringPtr (__argv[i], INT32_MAX))
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argv[i] = "";
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else
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argv[i] = __argv[i];
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n += strlen (argv[i]) + 1;
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}
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argv[__argc_safe] = NULL;
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if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
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{
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/*__seterrno ();*/ // this is run from the signal thread, so don't set errno
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sigproc_printf ("WriteFile sizeof argv failed, %E");
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}
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else
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for (const char **a = argv; *a; a++)
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if (!WriteFile (tothem, *a, strlen (*a) + 1, &nr, NULL))
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{
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sigproc_printf ("WriteFile arg %d failed, %E", a - argv);
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break;
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}
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break;
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}
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case PICOM_CWD:
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{
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sigproc_printf ("processing PICOM_CWD");
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unsigned int n = strlen (cygheap->cwd.get (path, 1, 1, NT_MAX_PATH)) + 1;
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if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
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sigproc_printf ("WriteFile sizeof cwd failed, %E");
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else if (!WriteFile (tothem, path, n, &nr, NULL))
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sigproc_printf ("WriteFile cwd failed, %E");
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break;
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}
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case PICOM_ROOT:
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{
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sigproc_printf ("processing PICOM_ROOT");
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unsigned n;
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if (cygheap->root.exists ())
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n = strlen (strcpy (path, cygheap->root.posix_path ())) + 1;
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else
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n = strlen (strcpy (path, "/")) + 1;
|
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if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
|
|
sigproc_printf ("WriteFile sizeof root failed, %E");
|
|
else if (!WriteFile (tothem, path, n, &nr, NULL))
|
|
sigproc_printf ("WriteFile root failed, %E");
|
|
break;
|
|
}
|
|
case PICOM_FDS:
|
|
{
|
|
sigproc_printf ("processing PICOM_FDS");
|
|
unsigned int n = 0;
|
|
int fd;
|
|
cygheap_fdenum cfd;
|
|
while ((fd = cfd.next ()) >= 0)
|
|
n += sizeof (int);
|
|
cfd.rewind ();
|
|
if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
|
|
sigproc_printf ("WriteFile sizeof fds failed, %E");
|
|
else
|
|
while ((fd = cfd.next ()) >= 0)
|
|
if (!WriteFile (tothem, &fd, sizeof fd, &nr, NULL))
|
|
{
|
|
sigproc_printf ("WriteFile fd %d failed, %E", fd);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case PICOM_PIPE_FHANDLER:
|
|
{
|
|
sigproc_printf ("processing PICOM_FDS");
|
|
HANDLE hdl = si._si_commune._si_pipe_fhandler;
|
|
unsigned int n = 0;
|
|
cygheap_fdenum cfd;
|
|
while (cfd.next () >= 0)
|
|
if (cfd->get_handle () == hdl)
|
|
{
|
|
fhandler_pipe *fh = cfd;
|
|
n = sizeof *fh;
|
|
if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
|
|
sigproc_printf ("WriteFile sizeof hdl failed, %E");
|
|
else if (!WriteFile (tothem, fh, n, &nr, NULL))
|
|
sigproc_printf ("WriteFile hdl failed, %E");
|
|
break;
|
|
}
|
|
if (!n && !WriteFile (tothem, &n, sizeof n, &nr, NULL))
|
|
sigproc_printf ("WriteFile sizeof hdl failed, %E");
|
|
break;
|
|
}
|
|
case PICOM_FD:
|
|
{
|
|
sigproc_printf ("processing PICOM_FD");
|
|
int fd = si._si_commune._si_fd;
|
|
unsigned int n = 0;
|
|
cygheap_fdget cfd (fd);
|
|
if (cfd < 0)
|
|
n = strlen (strcpy (path, "")) + 1;
|
|
else
|
|
n = strlen (cfd->get_proc_fd_name (path)) + 1;
|
|
if (!WriteFile (tothem, &n, sizeof n, &nr, NULL))
|
|
sigproc_printf ("WriteFile sizeof fd failed, %E");
|
|
else if (!WriteFile (tothem, path, n, &nr, NULL))
|
|
sigproc_printf ("WriteFile fd failed, %E");
|
|
break;
|
|
}
|
|
}
|
|
if (process_sync)
|
|
{
|
|
DWORD res = WaitForSingleObject (process_sync, 5000);
|
|
if (res != WAIT_OBJECT_0)
|
|
sigproc_printf ("WFSO failed - %d, %E", res);
|
|
else
|
|
sigproc_printf ("synchronized with pid %d", si.si_pid);
|
|
ForceCloseHandle (process_sync);
|
|
}
|
|
CloseHandle (tothem);
|
|
_my_tls._ctinfo->auto_release ();
|
|
return 0;
|
|
}
|
|
|
|
commune_result
|
|
_pinfo::commune_request (__uint32_t code, ...)
|
|
{
|
|
DWORD nr;
|
|
commune_result res;
|
|
va_list args;
|
|
siginfo_t si = {0};
|
|
HANDLE& hp = si._si_commune._si_process_handle;
|
|
HANDLE& fromthem = si._si_commune._si_read_handle;
|
|
HANDLE request_sync = NULL;
|
|
bool locked = false;
|
|
|
|
res.s = NULL;
|
|
res.n = 0;
|
|
|
|
if (!this || !pid)
|
|
{
|
|
set_errno (ESRCH);
|
|
goto err;
|
|
}
|
|
|
|
va_start (args, code);
|
|
si._si_commune._si_code = code;
|
|
switch (code)
|
|
{
|
|
case PICOM_PIPE_FHANDLER:
|
|
si._si_commune._si_pipe_fhandler = va_arg (args, HANDLE);
|
|
break;
|
|
|
|
case PICOM_FD:
|
|
si._si_commune._si_fd = va_arg (args, int);
|
|
break;
|
|
|
|
break;
|
|
}
|
|
va_end (args);
|
|
|
|
locked = true;
|
|
char name_buf[MAX_PATH];
|
|
request_sync = CreateSemaphore (&sec_none_nih, 0, LONG_MAX,
|
|
shared_name (name_buf, "commune", myself->pid));
|
|
if (!request_sync)
|
|
goto err;
|
|
ProtectHandle (request_sync);
|
|
|
|
si.si_signo = __SIGCOMMUNE;
|
|
if (sig_send (this, si))
|
|
{
|
|
ForceCloseHandle (request_sync); /* don't signal semaphore since there was apparently no receiving process */
|
|
request_sync = NULL;
|
|
goto err;
|
|
}
|
|
|
|
size_t n;
|
|
switch (code)
|
|
{
|
|
case PICOM_CMDLINE:
|
|
case PICOM_CWD:
|
|
case PICOM_ROOT:
|
|
case PICOM_FDS:
|
|
case PICOM_FD:
|
|
case PICOM_PIPE_FHANDLER:
|
|
if (!ReadFile (fromthem, &n, sizeof n, &nr, NULL) || nr != sizeof n)
|
|
{
|
|
__seterrno ();
|
|
goto err;
|
|
}
|
|
if (!n)
|
|
res.s = NULL;
|
|
else
|
|
{
|
|
res.s = (char *) cmalloc_abort (HEAP_COMMUNE, n);
|
|
char *p;
|
|
for (p = res.s; n && ReadFile (fromthem, p, n, &nr, NULL); p += nr, n -= nr)
|
|
continue;
|
|
if (n)
|
|
{
|
|
__seterrno ();
|
|
goto err;
|
|
}
|
|
res.n = p - res.s;
|
|
}
|
|
break;
|
|
}
|
|
goto out;
|
|
|
|
err:
|
|
memset (&res, 0, sizeof (res));
|
|
|
|
out:
|
|
if (request_sync)
|
|
{
|
|
LONG res;
|
|
ReleaseSemaphore (request_sync, 1, &res);
|
|
ForceCloseHandle (request_sync);
|
|
}
|
|
if (hp)
|
|
CloseHandle (hp);
|
|
if (fromthem)
|
|
CloseHandle (fromthem);
|
|
return res;
|
|
}
|
|
|
|
fhandler_pipe *
|
|
_pinfo::pipe_fhandler (HANDLE hdl, size_t &n)
|
|
{
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid == myself->pid)
|
|
return NULL;
|
|
commune_result cr = commune_request (PICOM_PIPE_FHANDLER, hdl);
|
|
n = cr.n;
|
|
return (fhandler_pipe *) cr.s;
|
|
}
|
|
|
|
char *
|
|
_pinfo::fd (int fd, size_t &n)
|
|
{
|
|
char *s;
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid != myself->pid)
|
|
{
|
|
commune_result cr = commune_request (PICOM_FD, fd);
|
|
s = cr.s;
|
|
n = cr.n;
|
|
}
|
|
else
|
|
{
|
|
cygheap_fdget cfd (fd);
|
|
if (cfd < 0)
|
|
s = cstrdup ("");
|
|
else
|
|
s = cfd->get_proc_fd_name ((char *) cmalloc_abort (HEAP_COMMUNE, NT_MAX_PATH));
|
|
n = strlen (s) + 1;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
char *
|
|
_pinfo::fds (size_t &n)
|
|
{
|
|
char *s;
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid != myself->pid)
|
|
{
|
|
commune_result cr = commune_request (PICOM_FDS);
|
|
s = cr.s;
|
|
n = cr.n;
|
|
}
|
|
else
|
|
{
|
|
n = 0;
|
|
int fd;
|
|
cygheap_fdenum cfd (true);
|
|
while ((fd = cfd.next ()) >= 0)
|
|
n += sizeof (int);
|
|
cfd.rewind ();
|
|
s = (char *) cmalloc_abort (HEAP_COMMUNE, n);
|
|
int *p = (int *) s;
|
|
while ((fd = cfd.next ()) >= 0 && (char *) p - s < (int) n)
|
|
*p++ = fd;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
char *
|
|
_pinfo::root (size_t& n)
|
|
{
|
|
char *s;
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid != myself->pid)
|
|
{
|
|
commune_result cr = commune_request (PICOM_ROOT);
|
|
s = cr.s;
|
|
n = cr.n;
|
|
}
|
|
else
|
|
{
|
|
if (cygheap->root.exists ())
|
|
s = cstrdup (cygheap->root.posix_path ());
|
|
else
|
|
s = cstrdup ("/");
|
|
n = strlen (s) + 1;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
char *
|
|
_pinfo::cwd (size_t& n)
|
|
{
|
|
char *s;
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid != myself->pid)
|
|
{
|
|
commune_result cr = commune_request (PICOM_CWD);
|
|
s = cr.s;
|
|
n = cr.n;
|
|
}
|
|
else
|
|
{
|
|
s = (char *) cmalloc_abort (HEAP_COMMUNE, NT_MAX_PATH);
|
|
cygheap->cwd.get (s, 1, 1, NT_MAX_PATH);
|
|
n = strlen (s) + 1;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
char *
|
|
_pinfo::cmdline (size_t& n)
|
|
{
|
|
char *s;
|
|
if (!this || !pid)
|
|
return NULL;
|
|
if (pid != myself->pid)
|
|
{
|
|
commune_result cr = commune_request (PICOM_CMDLINE);
|
|
s = cr.s;
|
|
n = cr.n;
|
|
}
|
|
else
|
|
{
|
|
n = 0;
|
|
for (char **a = __argv; *a; a++)
|
|
n += strlen (*a) + 1;
|
|
char *p;
|
|
p = s = (char *) cmalloc_abort (HEAP_COMMUNE, n);
|
|
for (char **a = __argv; *a; a++)
|
|
{
|
|
strcpy (p, *a);
|
|
p = strchr (p, '\0') + 1;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
/* This is the workhorse which waits for the write end of the pipe
|
|
created during new process creation. If the pipe is closed or a zero
|
|
is received on the pipe, it is assumed that the cygwin pid has exited.
|
|
Otherwise, various "signals" can be sent to the parent to inform the
|
|
parent to perform a certain action. */
|
|
static DWORD WINAPI
|
|
proc_waiter (void *arg)
|
|
{
|
|
pinfo vchild = *(pinfo *) arg;
|
|
((pinfo *) arg)->waiter_ready = true;
|
|
|
|
siginfo_t si = {0};
|
|
si.si_signo = SIGCHLD;
|
|
si.si_code = CLD_EXITED;
|
|
si.si_pid = vchild->pid;
|
|
#if 0 // FIXME: This is tricky to get right
|
|
si.si_utime = pchildren[rc]->rusage_self.ru_utime;
|
|
si.si_stime = pchildren[rc].rusage_self.ru_stime;
|
|
#endif
|
|
pid_t pid = vchild->pid;
|
|
|
|
for (;;)
|
|
{
|
|
DWORD nb;
|
|
char buf = '\0';
|
|
|
|
if (!ReadFile (vchild.rd_proc_pipe, &buf, 1, &nb, NULL)
|
|
&& GetLastError () != ERROR_BROKEN_PIPE)
|
|
{
|
|
system_printf ("error on read of child wait pipe %p, %E", vchild.rd_proc_pipe);
|
|
break;
|
|
}
|
|
|
|
si.si_uid = vchild->uid;
|
|
|
|
switch (buf)
|
|
{
|
|
case __ALERT_ALIVE:
|
|
continue;
|
|
case 0:
|
|
/* Child exited. Do some cleanup and signal myself. */
|
|
CloseHandle (vchild.rd_proc_pipe);
|
|
vchild.rd_proc_pipe = NULL;
|
|
vchild.maybe_set_exit_code_from_windows ();
|
|
if (WIFEXITED (vchild->exitcode))
|
|
si.si_code = CLD_EXITED;
|
|
else if (WCOREDUMP (vchild->exitcode))
|
|
si.si_code = CLD_DUMPED;
|
|
else
|
|
si.si_code = CLD_KILLED;
|
|
si.si_status = vchild->exitcode;
|
|
vchild->process_state = PID_EXITED;
|
|
/* This should always be last. Do not use vchild-> beyond this point */
|
|
break;
|
|
case SIGTTIN:
|
|
case SIGTTOU:
|
|
case SIGTSTP:
|
|
case SIGSTOP:
|
|
if (ISSTATE (myself, PID_NOCLDSTOP)) // FIXME: No need for this flag to be in _pinfo any longer
|
|
continue;
|
|
/* Child stopped. Signal myself. */
|
|
si.si_code = CLD_STOPPED;
|
|
break;
|
|
case SIGCONT:
|
|
continue;
|
|
default:
|
|
system_printf ("unknown value %d on proc pipe", buf);
|
|
continue;
|
|
}
|
|
|
|
/* Special case: If the "child process" that died is us, then we're
|
|
execing. Just call proc_subproc directly and then exit this loop.
|
|
We're done here. */
|
|
if (hExeced)
|
|
{
|
|
/* execing. no signals available now. */
|
|
proc_subproc (PROC_CLEARWAIT, 0);
|
|
break;
|
|
}
|
|
|
|
/* 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. */
|
|
sig_send (myself_nowait, si);
|
|
|
|
/* If we're just stopped or got a continue signal, keep looping.
|
|
Otherwise, return this thread to the pool. */
|
|
if (buf != '\0')
|
|
sigproc_printf ("looping");
|
|
else
|
|
break;
|
|
}
|
|
|
|
sigproc_printf ("exiting wait thread for pid %d", pid);
|
|
vchild.wait_thread = NULL;
|
|
_my_tls._ctinfo->auto_release (); /* automatically return the cygthread to the cygthread pool */
|
|
return 0;
|
|
}
|
|
|
|
HANDLE
|
|
_pinfo::dup_proc_pipe (HANDLE hProcess)
|
|
{
|
|
DWORD flags = DUPLICATE_SAME_ACCESS;
|
|
HANDLE orig_wr_proc_pipe = wr_proc_pipe;
|
|
/* Can't set DUPLICATE_CLOSE_SOURCE for exec case because we could be
|
|
execing a non-cygwin process and we need to set the exit value before the
|
|
parent sees it. */
|
|
if (this != myself || is_toplevel_proc)
|
|
flags |= DUPLICATE_CLOSE_SOURCE;
|
|
bool res = DuplicateHandle (GetCurrentProcess (), wr_proc_pipe,
|
|
hProcess, &wr_proc_pipe, 0, FALSE, flags);
|
|
if (!res && WaitForSingleObject (hProcess, 0) != WAIT_OBJECT_0)
|
|
{
|
|
wr_proc_pipe = orig_wr_proc_pipe;
|
|
system_printf ("DuplicateHandle failed, pid %d, hProcess %p, wr_proc_pipe %p, %E",
|
|
pid, hProcess, wr_proc_pipe);
|
|
}
|
|
else
|
|
{
|
|
wr_proc_pipe_owner = dwProcessId;
|
|
sigproc_printf ("duped wr_proc_pipe %p for pid %d(%u)", wr_proc_pipe,
|
|
pid, dwProcessId);
|
|
}
|
|
return orig_wr_proc_pipe;
|
|
}
|
|
|
|
/* function to set up the process pipe and kick off proc_waiter */
|
|
int
|
|
pinfo::wait ()
|
|
{
|
|
/* FIXME: execed processes should be able to wait for pids that were started
|
|
by the process which execed them. */
|
|
if (!CreatePipe (&rd_proc_pipe, &((*this)->wr_proc_pipe), &sec_none_nih, 16))
|
|
{
|
|
system_printf ("Couldn't create pipe tracker for pid %d, %E",
|
|
(*this)->pid);
|
|
return 0;
|
|
}
|
|
|
|
if (!(*this)->dup_proc_pipe (hProcess))
|
|
{
|
|
system_printf ("Couldn't duplicate pipe topid %d(%p), %E", (*this)->pid, hProcess);
|
|
return 0;
|
|
}
|
|
|
|
preserve (); /* Preserve the shared memory associated with the pinfo */
|
|
|
|
waiter_ready = false;
|
|
/* Fire up a new thread to track the subprocess */
|
|
cygthread *h = new cygthread (proc_waiter, this, "proc_waiter");
|
|
if (!h)
|
|
sigproc_printf ("tracking thread creation failed for pid %d", (*this)->pid);
|
|
else
|
|
{
|
|
wait_thread = h;
|
|
sigproc_printf ("created tracking thread for pid %d, winpid %p, rd_pipe %p",
|
|
(*this)->pid, (*this)->dwProcessId, rd_proc_pipe);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
_pinfo::sync_proc_pipe ()
|
|
{
|
|
if (wr_proc_pipe && wr_proc_pipe != INVALID_HANDLE_VALUE)
|
|
while (wr_proc_pipe_owner != GetCurrentProcessId ())
|
|
yield ();
|
|
}
|
|
|
|
/* function to send a "signal" to the parent when something interesting happens
|
|
in the child. */
|
|
bool
|
|
_pinfo::alert_parent (char sig)
|
|
{
|
|
DWORD nb = 0;
|
|
|
|
/* Send something to our parent. If the parent has gone away, close the pipe.
|
|
Don't send if this is an exec stub.
|
|
|
|
FIXME: Is there a race here if we run this while another thread is attempting
|
|
to exec()? */
|
|
if (wr_proc_pipe == INVALID_HANDLE_VALUE || !myself->wr_proc_pipe || hExeced)
|
|
/* no parent */;
|
|
else
|
|
{
|
|
sync_proc_pipe ();
|
|
if (WriteFile (wr_proc_pipe, &sig, 1, &nb, NULL))
|
|
/* all is well */;
|
|
else if (GetLastError () != ERROR_BROKEN_PIPE)
|
|
debug_printf ("sending %d notification to parent failed, %E", sig);
|
|
else
|
|
{
|
|
ppid = 1;
|
|
HANDLE closeit = wr_proc_pipe;
|
|
wr_proc_pipe = INVALID_HANDLE_VALUE;
|
|
CloseHandle (closeit);
|
|
}
|
|
}
|
|
return (bool) nb;
|
|
}
|
|
|
|
void
|
|
pinfo::release ()
|
|
{
|
|
if (procinfo)
|
|
{
|
|
void *unmap_procinfo = procinfo;
|
|
procinfo = NULL;
|
|
UnmapViewOfFile (unmap_procinfo);
|
|
}
|
|
if (h)
|
|
{
|
|
HANDLE close_h = h;
|
|
h = NULL;
|
|
ForceCloseHandle1 (close_h, pinfo_shared_handle);
|
|
}
|
|
}
|
|
|
|
/* DOCTOOL-START
|
|
|
|
<sect1 id="func-cygwin-winpid-to-pid">
|
|
<title>cygwin_winpid_to_pid</title>
|
|
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<funcsynopsis><funcprototype>
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<funcdef>extern "C" pid_t
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<function>cygwin_winpid_to_pid</function>
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</funcdef>
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<paramdef>int <parameter>winpid</parameter></paramdef>
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</funcprototype></funcsynopsis>
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<para>Given a windows pid, converts to the corresponding Cygwin
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pid, if any. Returns -1 if windows pid does not correspond to
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a cygwin pid.</para>
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<example>
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<title>Example use of cygwin_winpid_to_pid</title>
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<programlisting>
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extern "C" cygwin_winpid_to_pid (int winpid);
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pid_t mypid;
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mypid = cygwin_winpid_to_pid (windows_pid);
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</programlisting>
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</example>
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</sect1>
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DOCTOOL-END */
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extern "C" pid_t
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cygwin_winpid_to_pid (int winpid)
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{
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pinfo p (cygwin_pid (winpid));
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if (p)
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return p->pid;
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set_errno (ESRCH);
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return (pid_t) -1;
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}
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#define slop_pidlist 200
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#define size_pidlist(i) (sizeof (pidlist[0]) * ((i) + 1))
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#define size_pinfolist(i) (sizeof (pinfolist[0]) * ((i) + 1))
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class _onreturn
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{
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HANDLE *h;
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public:
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~_onreturn ()
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{
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if (h && *h)
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{
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CloseHandle (*h);
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*h = NULL;
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h = NULL;
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}
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}
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void no_close_p_handle () {h = NULL;}
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_onreturn (HANDLE& _h): h (&_h) {}
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};
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inline void
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winpids::add (DWORD& nelem, bool winpid, DWORD pid)
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{
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pid_t cygpid = cygwin_pid (pid);
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if (nelem >= npidlist)
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{
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npidlist += slop_pidlist;
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pidlist = (DWORD *) realloc (pidlist, size_pidlist (npidlist + 1));
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pinfolist = (pinfo *) realloc (pinfolist, size_pinfolist (npidlist + 1));
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}
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pinfo& p = pinfolist[nelem];
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/* Open a the process to prevent a subsequent exit from invalidating the
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shared memory region. */
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p.hProcess = OpenProcess (PROCESS_QUERY_INFORMATION, false, pid);
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_onreturn onreturn (p.hProcess);
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/* If we couldn't open the process then we don't have rights to it and should
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make a copy of the shared memory area if it exists (it may not).
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*/
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bool perform_copy;
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if (!p.hProcess)
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perform_copy = true;
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else
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perform_copy = make_copy;
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p.init (cygpid, PID_NOREDIR | pinfo_access, NULL);
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/* If we're just looking for winpids then don't do any special cygwin "stuff* */
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if (winpid)
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goto out;
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/* !p means that we couldn't find shared memory for this pid. Probably means
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that it isn't a cygwin process. */
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if (!p)
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{
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if (!pinfo_access)
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return;
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p.init (cygpid, PID_NOREDIR, NULL);
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if (!p)
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return;
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}
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/* Scan list of previously recorded pids to make sure that this pid hasn't
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shown up before. This can happen when a process execs. */
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for (unsigned i = 0; i < nelem; i++)
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if (pinfolist[i]->pid == p->pid)
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{
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if ((_pinfo *) p != (_pinfo *) myself)
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p.release ();
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return;
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}
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out:
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/* Exit here.
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If p is "false" then, eventually any opened process handle will be closed and
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the function will exit without adding anything to the pid list.
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If p is "true" then we've discovered a cygwin process.
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Handle "myself" differently. Don't copy it and close/zero the handle we
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just opened to it.
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If not performing a copy, then keep the process handle open for the duration
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of the life of the procinfo region to potential races when a new process uses
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this pid.
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Otherwise, malloc some memory for a copy of the shared memory.
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If the malloc failed, then "oh well". Just keep the shared memory around
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and eventually close the handle when the winpids goes out of scope.
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If malloc succeeds, copy the procinfo we just grabbed into the new region,
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release the shared memory and allow the handle to be closed when this
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function returns.
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Oh, and add the pid to the list and bump the number of elements. */
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if (p)
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{
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if (p == (_pinfo *) myself)
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/* handle specially. Close the handle but (eventually) don't
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deallocate procinfo in release call */;
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else if (!perform_copy)
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onreturn.no_close_p_handle (); /* Don't close the handle until release */
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else
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{
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_pinfo *pnew = (_pinfo *) malloc (sizeof (*p.procinfo));
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if (!pnew)
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onreturn.no_close_p_handle ();
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else
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{
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*pnew = *p.procinfo;
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if ((_pinfo *) p != (_pinfo *) myself)
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p.release ();
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p.procinfo = pnew;
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p.destroy = false;
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}
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}
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}
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if (p || winpid)
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pidlist[nelem++] = pid;
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}
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DWORD
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winpids::enum_processes (bool winpid)
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{
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static DWORD szprocs;
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static SYSTEM_PROCESSES *procs;
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DWORD nelem = 0;
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if (!szprocs)
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procs = (SYSTEM_PROCESSES *) malloc (sizeof (*procs) + (szprocs = 200 * sizeof (*procs)));
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NTSTATUS res;
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for (;;)
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{
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res = NtQuerySystemInformation (SystemProcessesAndThreadsInformation,
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procs, szprocs, NULL);
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if (res == 0)
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break;
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if (res == STATUS_INFO_LENGTH_MISMATCH)
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procs = (SYSTEM_PROCESSES *) realloc (procs, szprocs += 200 * sizeof (*procs));
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else
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{
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system_printf ("error %p reading system process information", res);
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return 0;
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}
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}
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SYSTEM_PROCESSES *px = procs;
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for (;;)
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{
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if (px->ProcessId)
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add (nelem, winpid, px->ProcessId);
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if (!px->NextEntryDelta)
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break;
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px = (SYSTEM_PROCESSES *) ((char *) px + px->NextEntryDelta);
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}
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return nelem;
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}
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|
|
void
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|
winpids::set (bool winpid)
|
|
{
|
|
__malloc_lock ();
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npids = enum_processes (winpid);
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if (pidlist)
|
|
pidlist[npids] = 0;
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__malloc_unlock ();
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}
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|
|
DWORD
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|
winpids::enum_init (bool winpid)
|
|
{
|
|
return enum_processes (winpid);
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}
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|
|
void
|
|
winpids::release ()
|
|
{
|
|
_pinfo *p;
|
|
for (unsigned i = 0; i < npids; i++)
|
|
if (pinfolist[i] == (_pinfo *) myself)
|
|
continue;
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|
else if (pinfolist[i].hProcess)
|
|
{
|
|
if (pinfolist[i])
|
|
pinfolist[i].release ();
|
|
CloseHandle (pinfolist[i].hProcess);
|
|
}
|
|
else if ((p = pinfolist[i]))
|
|
{
|
|
pinfolist[i].procinfo = NULL;
|
|
free (p);
|
|
}
|
|
}
|
|
|
|
winpids::~winpids ()
|
|
{
|
|
if (npidlist)
|
|
{
|
|
release ();
|
|
free (pidlist);
|
|
free (pinfolist);
|
|
}
|
|
}
|