newlib/winsup/cygwin/pinfo.cc
Christopher Faylor f76325499a * path.cc (readlink): Check if buffer length is positive. Truncate output to
buffer length.  Don't terminate buffer with '\0'.
2000-09-04 17:52:42 +00:00

390 lines
8.7 KiB
C++

/* 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 "thread.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
static char NO_COPY pinfo_dummy[sizeof(pinfo)] = {0};
pinfo NO_COPY myself ((_pinfo *)&pinfo_dummy); // Avoid myself != NULL checks
/* 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", myself->progname);
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)
{
if (envp)
{
environ_init (envp);
/* 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); /* call after myself has been set up */
}
debug_printf ("pid %d, pgid %d", myself->pid, myself->pgid);
}
struct sigaction&
_pinfo::getsig(int sig)
{
#ifdef _MT_SAFE
if (thread2signal)
return thread2signal->sigs[sig];
return sigs[sig];
#else
return sigs[sig];
#endif
};
sigset_t&
_pinfo::getsigmask ()
{
#ifdef _MT_SAFE
if (thread2signal)
return *thread2signal->sigmask;
return sig_mask;
#else
return sig_mask;
#endif
};
void
_pinfo::setsigmask (sigset_t _mask)
{
#ifdef _MT_SAFE
if (thread2signal)
*(thread2signal->sigmask) = _mask;
sig_mask=_mask;
#else
sig_mask=_mask;
#endif
}
LONG *
_pinfo::getsigtodo(int sig)
{
#ifdef _MT_SAFE
if (thread2signal)
return thread2signal->sigtodo + __SIGOFFSET + sig;
return _sigtodo + __SIGOFFSET + sig;
#else
return _sigtodo + __SIGOFFSET + sig;
#endif
}
extern HANDLE hMainThread;
HANDLE
_pinfo::getthread2signal()
{
#ifdef _MT_SAFE
if (thread2signal)
return thread2signal->win32_obj_id;
return hMainThread;
#else
return hMainThread;
#endif
}
void
_pinfo::setthread2signal(void *_thr)
{
#ifdef _MT_SAFE
// assert has myself lock
thread2signal=(ThreadItem*)_thr;
#else
#endif
}
void
_pinfo::copysigs(_pinfo *_other)
{
sigs = _other->sigs;
}
void
_pinfo::record_death ()
{
/* CGF FIXME - needed? */
if (dwProcessId == GetCurrentProcessId () && !my_parent_is_alive ())
{
process_state = PID_NOT_IN_USE;
hProcess = NULL;
}
}
void
pinfo::init (pid_t n, DWORD create, HANDLE in_h)
{
if (n == myself->pid)
{
procinfo = myself;
destroy = 0;
h = NULL;
return;
}
int created;
char mapname[MAX_PATH];
__small_sprintf (mapname, "cygpid.%x", n);
int mapsize;
if (create & PID_EXECED)
mapsize = PINFO_REDIR_SIZE;
else
mapsize = sizeof (_pinfo);
if (in_h)
{
h = in_h;
created = 0;
}
else if (!create)
{
/* CGF FIXME -- deal with inheritance after an exec */
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 (create)
__seterrno ();
procinfo = NULL;
return;
}
ProtectHandle1 (h, pinfo_shared_handle);
procinfo = (_pinfo *) MapViewOfFile (h, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
if (procinfo->process_state & PID_EXECED)
{
pid_t realpid = procinfo->pid;
debug_printf ("execed process windows pid %d, cygwin pid %d", n, realpid);
release ();
if (realpid == n)
api_fatal ("retrieval of execed process info for pid %d failed due to recursion.", n);
return init (realpid);
}
if (created)
{
if (!(create & PID_EXECED))
procinfo->pid = n;
else
{
procinfo->pid = myself->pid;
procinfo->process_state |= PID_IN_USE | PID_EXECED;
}
}
destroy = 1;
}
void
pinfo::release ()
{
if (h)
{
#ifdef DEBUGGING
if (((DWORD) procinfo & 0x77000000) == 0x61000000) try_to_debug ();
#endif
UnmapViewOfFile (procinfo);
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);
}