412 lines
9.1 KiB
C++
412 lines
9.1 KiB
C++
/* pinfo.cc: process table support
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Copyright 1996, 1997, 1998, 2000, 2001, 2002 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 <stdlib.h>
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#include <time.h>
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#include <errno.h>
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#include <limits.h>
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#include "security.h"
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#include "fhandler.h"
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#include "path.h"
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#include "dtable.h"
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#include "cygerrno.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "cygwin_version.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 <ntdef.h>
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#include "ntdll.h"
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static char NO_COPY pinfo_dummy[sizeof (_pinfo)] = {0};
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pinfo NO_COPY myself ((_pinfo *)&pinfo_dummy); // Avoid myself != NULL checks
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HANDLE hexec_proc;
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void __stdcall
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pinfo_fixup_after_fork ()
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{
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if (hexec_proc)
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CloseHandle (hexec_proc);
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if (!DuplicateHandle (hMainProc, hMainProc, hMainProc, &hexec_proc, 0,
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TRUE, DUPLICATE_SAME_ACCESS))
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{
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system_printf ("couldn't save current process handle %p, %E", hMainProc);
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hexec_proc = NULL;
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}
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}
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/* Initialize the process table.
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This is done once when the dll is first loaded. */
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void __stdcall
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set_myself (pid_t pid, HANDLE h)
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{
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DWORD winpid = GetCurrentProcessId ();
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if (pid == 1)
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pid = cygwin_pid (winpid);
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myself.init (pid, 1, h);
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myself->dwProcessId = winpid;
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myself->process_state |= PID_IN_USE;
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myself->start_time = time (NULL); /* Register our starting time. */
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(void) GetModuleFileName (NULL, myself->progname,
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sizeof(myself->progname));
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if (!strace.active)
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strace.hello ();
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return;
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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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set_myself (1);
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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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environ_init (NULL, 0); /* call after myself has been set up */
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}
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debug_printf ("pid %d, pgid %d", myself->pid, myself->pgid);
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}
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void
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_pinfo::exit (UINT n, bool norecord)
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{
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if (this)
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{
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if (!norecord)
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process_state = PID_EXITED;
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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 this, though. */
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struct rusage r;
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fill_rusage (&r, hMainProc);
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add_rusage (&rusage_self, &r);
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}
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sigproc_printf ("Calling ExitProcess %d", n);
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ExitProcess (n);
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}
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void
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pinfo::init (pid_t n, DWORD flag, HANDLE in_h)
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{
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if (myself && n == myself->pid)
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{
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procinfo = myself;
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destroy = 0;
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h = NULL;
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return;
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}
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int createit = flag & (PID_IN_USE | PID_EXECED);
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for (int i = 0; i < 10; i++)
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{
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int created;
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char mapname[MAX_PATH];
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__small_sprintf (mapname, "cygpid.%x", n);
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int 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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if (in_h)
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{
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h = in_h;
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created = 0;
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}
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else if (!createit)
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{
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h = OpenFileMappingA (FILE_MAP_READ | FILE_MAP_WRITE, FALSE, mapname);
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created = 0;
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}
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else
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{
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h = CreateFileMapping (INVALID_HANDLE_VALUE, &sec_all_nih,
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PAGE_READWRITE, 0, mapsize, mapname);
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created = h && GetLastError () != ERROR_ALREADY_EXISTS;
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}
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if (!h)
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{
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if (createit)
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__seterrno ();
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procinfo = NULL;
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return;
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}
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procinfo = (_pinfo *) MapViewOfFile (h, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
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ProtectHandle1 (h, pinfo_shared_handle);
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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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release ();
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set_errno (ENOENT);
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return;
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}
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if (procinfo->process_state & PID_EXECED)
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{
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assert (!i);
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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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release ();
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if (flag & PID_ALLPIDS)
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{
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set_errno (ENOENT);
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break;
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}
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continue;
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}
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/* In certain rare, pathological cases, it is possible for the shared
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memory region to exist for a while after a process has exited. This
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should only be a brief occurrence, so rather than introduce some kind
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of locking mechanism, just loop. FIXME: I'm sure I'll regret doing it
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this way at some point. */
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if (i < 9 && !created && createit && (procinfo->process_state & PID_EXITED))
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{
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Sleep (5);
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release ();
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continue;
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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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break;
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}
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destroy = 1;
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}
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void
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pinfo::release ()
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{
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if (h)
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{
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#ifdef DEBUGGING
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if (((DWORD) procinfo & 0x77000000) == 0x61000000) try_to_debug ();
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#endif
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UnmapViewOfFile (procinfo);
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procinfo = NULL;
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ForceCloseHandle1 (h, pinfo_shared_handle);
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h = NULL;
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}
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}
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/* DOCTOOL-START
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<sect1 id="func-cygwin-winpid-to-pid">
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<title>cygwin_winpid_to_pid</title>
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<funcsynopsis>
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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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</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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#include <tlhelp32.h>
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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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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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pinfolist[nelem].init (cygpid, PID_NOREDIR | (winpid ? PID_ALLPIDS : 0));
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if (winpid)
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/* nothing to do */;
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else if (!pinfolist[nelem])
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return;
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else
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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 == pinfolist[nelem]->pid)
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{
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if ((_pinfo *) pinfolist[nelem] != (_pinfo *) myself)
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pinfolist[nelem].release ();
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return;
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}
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pidlist[nelem++] = pid;
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}
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DWORD
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winpids::enumNT (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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DWORD
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winpids::enum9x (bool winpid)
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{
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DWORD nelem = 0;
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HANDLE h = CreateToolhelp32Snapshot (TH32CS_SNAPPROCESS, 0);
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if (!h)
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{
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system_printf ("Couldn't create process snapshot, %E");
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return 0;
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}
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PROCESSENTRY32 proc;
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proc.dwSize = sizeof (proc);
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if (Process32First (h, &proc))
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do
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{
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if (proc.th32ProcessID)
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add (nelem, winpid, proc.th32ProcessID);
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}
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while (Process32Next (h, &proc));
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CloseHandle (h);
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return nelem;
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}
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void
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winpids::init (bool winpid)
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{
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npids = (this->*enum_processes) (winpid);
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if (pidlist)
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pidlist[npids] = 0;
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}
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DWORD
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winpids::enum_init (bool winpid)
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{
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if (wincap.is_winnt ())
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enum_processes = &winpids::enumNT;
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else
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enum_processes = &winpids::enum9x;
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return (this->*enum_processes) (winpid);
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}
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void
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winpids::release ()
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{
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for (unsigned i = 0; i < npids; i++)
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if (pinfolist[i] && (_pinfo *) pinfolist[i] != (_pinfo *) myself)
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pinfolist[i].release ();
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}
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winpids::~winpids ()
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{
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if (npidlist)
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{
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release ();
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free (pidlist);
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free (pinfolist);
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}
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}
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