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libc/winsup/cygwin/pinfo.cc

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/* pinfo.cc: process table support
Copyright 1996, 1997, 1998, 2000 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <limits.h>
#include "fhandler.h"
#include "dtable.h"
#include "cygerrno.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "cygwin_version.h"
#include "perprocess.h"
#include "environ.h"
#include "security.h"
#include <assert.h>
static char NO_COPY pinfo_dummy[sizeof(pinfo)] = {0};
pinfo NO_COPY myself ((_pinfo *)&pinfo_dummy); // Avoid myself != NULL checks
HANDLE hexec_proc = NULL;
void __stdcall
pinfo_fixup_after_fork ()
{
if (hexec_proc)
CloseHandle (hexec_proc);
if (!DuplicateHandle (hMainProc, hMainProc, hMainProc, &hexec_proc, 0,
TRUE, DUPLICATE_SAME_ACCESS))
{
system_printf ("couldn't save current process handle %p, %E", hMainProc);
hexec_proc = NULL;
}
}
/* Initialize the process table.
This is done once when the dll is first loaded. */
void __stdcall
set_myself (pid_t pid, HANDLE h)
{
DWORD winpid = GetCurrentProcessId ();
if (pid == 1)
pid = cygwin_pid (winpid);
myself.init (pid, 1, h);
myself->dwProcessId = winpid;
myself->process_state |= PID_IN_USE;
myself->start_time = time (NULL); /* Register our starting time. */
char buf[30];
__small_sprintf (buf, "cYg%8x %x", _STRACE_INTERFACE_ACTIVATE_ADDR,
&strace.active);
OutputDebugString (buf);
(void) GetModuleFileName (NULL, myself->progname,
sizeof(myself->progname));
if (strace.active)
{
extern char osname[];
strace.prntf (1, NULL, "**********************************************");
strace.prntf (1, NULL, "Program name: %s (%d)", myself->progname, myself->pid);
strace.prntf (1, NULL, "App version: %d.%d, api: %d.%d",
user_data->dll_major, user_data->dll_minor,
user_data->api_major, user_data->api_minor);
strace.prntf (1, NULL, "DLL version: %d.%d, api: %d.%d",
cygwin_version.dll_major, cygwin_version.dll_minor,
cygwin_version.api_major, cygwin_version.api_minor);
strace.prntf (1, NULL, "DLL build: %s", cygwin_version.dll_build_date);
strace.prntf (1, NULL, "OS version: Windows %s", osname);
strace.prntf (1, NULL, "**********************************************");
}
return;
}
/* Initialize the process table entry for the current task.
This is not called for fork'd tasks, only exec'd ones. */
void __stdcall
pinfo_init (char **envp, int envc)
{
if (envp)
{
environ_init (envp, envc);
/* spawn has already set up a pid structure for us so we'll use that */
myself->process_state |= PID_CYGPARENT;
}
else
{
/* Invent our own pid. */
set_myself (1);
myself->ppid = 1;
myself->pgid = myself->sid = myself->pid;
myself->ctty = -1;
myself->uid = USHRT_MAX;
environ_init (NULL, 0); /* call after myself has been set up */
}
/* Allow backup semantics. It's better done only once on process start
instead of each time a file is opened. */
if (allow_ntsec)
set_process_privileges ();
debug_printf ("pid %d, pgid %d", myself->pid, myself->pgid);
}
void
_pinfo::exit (UINT n, bool norecord)
{
if (!norecord)
process_state = PID_EXITED;
/* FIXME: There is a potential race between an execed process and its
parent here. I hated to add a mutex just for this, though. */
struct rusage r;
fill_rusage (&r, hMainProc);
add_rusage (&rusage_self, &r);
sigproc_printf ("Calling ExitProcess %d", n);
ExitProcess (n);
}
void
pinfo::init (pid_t n, DWORD flag, HANDLE in_h)
{
if (n == myself->pid)
{
procinfo = myself;
destroy = 0;
h = NULL;
return;
}
int createit = flag & PID_IN_USE;
for (int i = 0; i < 10; i++)
{
int created;
char mapname[MAX_PATH];
__small_sprintf (mapname, "cygpid.%x", n);
int mapsize;
if (flag & PID_EXECED)
mapsize = PINFO_REDIR_SIZE;
else
mapsize = sizeof (_pinfo);
if (in_h)
{
h = in_h;
created = 0;
}
else if (!createit)
{
h = OpenFileMappingA (FILE_MAP_READ | FILE_MAP_WRITE, FALSE, mapname);
created = 0;
}
else
{
h = CreateFileMapping ((HANDLE) 0xffffffff, &sec_all_nih,
PAGE_READWRITE, 0, mapsize, mapname);
created = h && GetLastError () != ERROR_ALREADY_EXISTS;
}
if (!h)
{
if (createit)
__seterrno ();
procinfo = NULL;
return;
}
procinfo = (_pinfo *) MapViewOfFile (h, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
ProtectHandle1 (h, pinfo_shared_handle);
if ((procinfo->process_state & PID_INITIALIZING) && (flag & PID_NOREDIR))
{
release ();
set_errno (ENOENT);
return;
}
if (procinfo->process_state & PID_EXECED)
{
assert (!i);
pid_t realpid = procinfo->pid;
debug_printf ("execed process windows pid %d, cygwin pid %d", n, realpid);
if (realpid == n)
api_fatal ("retrieval of execed process info for pid %d failed due to recursion.", n);
n = realpid;
release ();
continue;
}
/* In certain rare, pathological cases, it is possible for the shared
memory region to exist for a while after a process has exited. This
should only be a brief occurrence, so rather than introduce some kind
of locking mechanism, just loop. FIXME: I'm sure I'll regret doing it
this way at some point. */
if (i < 9 && !created && createit && (procinfo->process_state & PID_EXITED))
{
Sleep (5);
release ();
continue;
}
if (!created)
/* nothing */;
else if (!(flag & PID_EXECED))
procinfo->pid = n;
else
{
procinfo->pid = myself->pid;
procinfo->process_state |= PID_IN_USE | PID_EXECED;
}
break;
}
destroy = 1;
}
void
pinfo::release ()
{
if (h)
{
#ifdef DEBUGGING
if (((DWORD) procinfo & 0x77000000) == 0x61000000) try_to_debug ();
#endif
UnmapViewOfFile (procinfo);
procinfo = NULL;
ForceCloseHandle1 (h, pinfo_shared_handle);
h = NULL;
}
}
/* DOCTOOL-START
<sect1 id="func-cygwin-winpid-to-pid">
<title>cygwin_winpid_to_pid</title>
<funcsynopsis>
<funcdef>extern "C" pid_t
<function>cygwin_winpid_to_pid</function>
</funcdef>
<paramdef>int <parameter>winpid</parameter></paramdef>
</funcsynopsis>
<para>Given a windows pid, converts to the corresponding Cygwin
pid, if any. Returns -1 if windows pid does not correspond to
a cygwin pid.</para>
<example>
<title>Example use of cygwin_winpid_to_pid</title>
<programlisting>
extern "C" cygwin_winpid_to_pid (int winpid);
pid_t mypid;
mypid = cygwin_winpid_to_pid (windows_pid);
</programlisting>
</example>
</sect1>
DOCTOOL-END */
extern "C" pid_t
cygwin_winpid_to_pid (int winpid)
{
pinfo p (winpid);
if (p)
return p->pid;
set_errno (ESRCH);
return (pid_t) -1;
}
#include <tlhelp32.h>
#include <psapi.h>
typedef BOOL (WINAPI * ENUMPROCESSES) (DWORD *, DWORD, DWORD *);
typedef HANDLE (WINAPI * CREATESNAPSHOT) (DWORD, DWORD);
typedef BOOL (WINAPI * PROCESSWALK) (HANDLE, LPPROCESSENTRY32);
typedef BOOL (WINAPI * CLOSESNAPSHOT) (HANDLE);
static NO_COPY CREATESNAPSHOT myCreateToolhelp32Snapshot = NULL;
static NO_COPY PROCESSWALK myProcess32First = NULL;
static NO_COPY PROCESSWALK myProcess32Next = NULL;
static BOOL WINAPI enum_init (DWORD *lpidProcess, DWORD cb, DWORD *cbneeded);
static NO_COPY ENUMPROCESSES myEnumProcesses = enum_init;
static BOOL WINAPI
EnumProcessesW95 (DWORD *lpidProcess, DWORD cb, DWORD *cbneeded)
{
HANDLE h;
*cbneeded = 0;
h = myCreateToolhelp32Snapshot (TH32CS_SNAPPROCESS, 0);
if (!h)
return 0;
PROCESSENTRY32 proc;
int i = 0;
proc.dwSize = sizeof (proc);
if (myProcess32First(h, &proc))
do
lpidProcess[i++] = cygwin_pid (proc.th32ProcessID);
while (myProcess32Next (h, &proc));
CloseHandle (h);
if (i == 0)
return 0;
*cbneeded = i * sizeof (DWORD);
return 1;
}
void
winpids::init ()
{
DWORD n;
if (!myEnumProcesses (pidlist, sizeof (pidlist) / sizeof (pidlist[0]), &n))
npids = 0;
else
npids = n / sizeof (pidlist[0]);
pidlist[npids] = 0;
}
static BOOL WINAPI
enum_init (DWORD *lpidProcess, DWORD cb, DWORD *cbneeded)
{
HINSTANCE h;
if (os_being_run == winNT)
{
h = LoadLibrary ("psapi.dll");
if (!h)
return 0;
myEnumProcesses = (ENUMPROCESSES) GetProcAddress (h, "EnumProcesses");
if (!myEnumProcesses)
return 0;
}
else
{
h = GetModuleHandle("kernel32.dll");
myCreateToolhelp32Snapshot = (CREATESNAPSHOT)
GetProcAddress(h, "CreateToolhelp32Snapshot");
myProcess32First = (PROCESSWALK)
GetProcAddress(h, "Process32First");
myProcess32Next = (PROCESSWALK)
GetProcAddress(h, "Process32Next");
if (!myCreateToolhelp32Snapshot || !myProcess32First || !myProcess32Next)
return 0;
myEnumProcesses = EnumProcessesW95;
}
return myEnumProcesses (lpidProcess, cb, cbneeded);
}
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