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pinfo.cc
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/* pinfo.cc: process table support
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 "miscfuncs.h"
#include <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "sigproc.h"
#include "pinfo.h"
#include "perprocess.h"
#include "environ.h"
#include "ntdll.h"
#include "shared_info.h"
#include "cygheap.h"
#include "cygmalloc.h"
#include "cygtls.h"
#include "tls_pbuf.h"
#include "child_info.h"
#include "dll_init.h"
class pinfo_basic: public _pinfo
{
public:
pinfo_basic();
};
pinfo_basic::pinfo_basic ()
{
dwProcessId = GetCurrentProcessId ();
PWCHAR pend = wcpncpy (progname, global_progname,
sizeof (progname) / sizeof (WCHAR) - 1);
*pend = L'\0';
/* Default uid/gid are needed very early to initialize shared user info. */
uid = ILLEGAL_UID;
gid = ILLEGAL_GID;
}
pinfo_basic myself_initial NO_COPY;
pinfo NO_COPY myself (static_cast<_pinfo *> (&myself_initial)); // Avoid myself != NULL checks
/* Setup the pinfo structure for this process. There may already be a
_pinfo for this "pid" if h != NULL. */
void
pinfo::thisproc (HANDLE h)
{
procinfo = NULL;
bool execed = !!h;
DWORD flags = PID_IN_USE | PID_ACTIVE;
/* Forked process or process started from non-Cygwin parent needs a pid. */
if (!execed)
{
cygheap->pid = create_cygwin_pid ();
flags |= PID_NEW;
h = INVALID_HANDLE_VALUE;
}
/* spawnve'd process got pid in parent, cygheap->pid has been set in
child_info_spawn::handle_spawn. */
init (cygheap->pid, flags, h);
procinfo->process_state |= PID_IN_USE;
procinfo->dwProcessId = myself_initial.dwProcessId;
procinfo->sendsig = myself_initial.sendsig;
wcscpy (procinfo->progname, myself_initial.progname);
if (!execed)
create_winpid_symlink ();
procinfo->exec_sendsig = NULL;
procinfo->exec_dwProcessId = 0;
debug_printf ("myself dwProcessId %u", procinfo->dwProcessId);
}
/* Initialize the process table entry for the current task.
This is not called for forked tasks, only execed ones. */
void
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. */
myself.thisproc (NULL);
myself->pgid = myself->sid = myself->pid;
myself->ctty = CTTY_UNINITIALIZED;
myself->uid = ILLEGAL_UID;
myself->gid = ILLEGAL_GID;
environ_init (NULL, 0); /* call after myself has been set up */
myself->nice = winprio_to_nice (GetPriorityClass (GetCurrentProcess ()));
myself->ppid = 1; /* always set last */
debug_printf ("Set nice to %d", myself->nice);
}
myself->process_state |= PID_ACTIVE;
myself->process_state &= ~(PID_INITIALIZING | PID_EXITED | PID_REAPED);
if (being_debugged ())
myself->process_state |= PID_DEBUGGED;
myself.preserve ();
debug_printf ("pid %d, pgid %d, process_state %y",
myself->pid, myself->pgid, myself->process_state);
}
DWORD
pinfo::status_exit (DWORD x)
{
switch ((NTSTATUS) x)
{
case STATUS_DLL_NOT_FOUND:
{
path_conv pc;
if (!procinfo)
pc.check ("/dev/null", PC_POSIX);
else
{
UNICODE_STRING uc;
RtlInitUnicodeString(&uc, procinfo->progname);
pc.check (&uc, PC_POSIX);
}
small_printf ("%s: error while loading shared libraries: %s: cannot "
"open shared object file: No such file or directory\n",
pc.get_posix (), find_first_notloaded_dll (pc));
x = 127 << 8;
}
break;
case STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION: /* custom error value */
/* We've already printed the error message in pseudo-reloc.c */
x = 127 << 8;
break;
case STATUS_ACCESS_VIOLATION:
x = SIGSEGV;
break;
case STATUS_ILLEGAL_INSTRUCTION:
x = SIGILL;
break;
case STATUS_NO_MEMORY:
/* If the PATH environment variable is longer than about 30K and the full
Windows environment is > 32K, startup of an exec'ed process fails with
STATUS_NO_MEMORY. This happens with all Cygwin executables, as well
as, for instance, notepad, but it does not happen with CMD for some
reason (but note, the environment *in* CMD is broken and shortened).
This occurs at a point where there's no return to the exec'ing parent
process, so we have to find some way to inform the user what happened.
FIXME: For now, just return with SIGBUS set. Maybe it's better to add
a lengthy small_printf instead. */
x = SIGBUS;
break;
case STATUS_CONTROL_C_EXIT:
x = SIGINT;
break;
default:
debug_printf ("*** STATUS_%y\n", x);
x = 127 << 8;
}
return EXITCODE_SET | x;
}
# define self (*this)
void
pinfo::set_exit_code (DWORD x)
{
if (x >= 0xc0000000UL)
self->exitcode = status_exit (x);
else
self->exitcode = EXITCODE_SET | (sigExeced ?: (x & 0xff) << 8);
}
void
pinfo::maybe_set_exit_code_from_windows ()
{
DWORD x = 0xdeadbeef;
DWORD oexitcode = self->exitcode;
if (hProcess && !(self->exitcode & EXITCODE_SET))
{
WaitForSingleObject (hProcess, INFINITE); /* just to be safe, in case
process hasn't quite exited
after closing pipe */
GetExitCodeProcess (hProcess, &x);
set_exit_code (x);
}
sigproc_printf ("pid %d, exit value - old %y, windows %y, cygwin %y",
self->pid, oexitcode, x, self->exitcode);
}
void
pinfo::exit (DWORD n)
{
debug_only_printf ("winpid %d, exit %d", GetCurrentProcessId (), n);
proc_terminate ();
lock_process until_exit (true);
cygthread::terminate ();
if (n != EXITCODE_NOSET)
self->exitcode = EXITCODE_SET | n;/* We're really exiting. Record the UNIX exit code. */
else
maybe_set_exit_code_from_windows (); /* may block */
exit_state = ES_FINAL;
if (CTTY_IS_VALID (myself->ctty) && !iscons_dev (myself->ctty))
{
lock_ttys here;
tty *t = cygwin_shared->tty[device::minor(myself->ctty)];
if (!t->slave_alive ())
t->setpgid (0);
}
/* FIXME: There is a potential race between an execed process and its
parent here. I hated to add a mutex just for that, though. */
struct rusage r;
fill_rusage (&r, GetCurrentProcess ());
add_rusage (&self->rusage_self, &r);
int exitcode = self->exitcode & 0xffff;
if (!self->cygstarted)
exitcode = ((exitcode & 0xff) << 8) | ((exitcode >> 8) & 0xff);
sigproc_printf ("Calling dlls.cleanup_forkables n %y, exitcode %y", n, exitcode);
dlls.cleanup_forkables ();
sigproc_printf ("Calling ExitProcess n %y, exitcode %y", n, exitcode);
if (!TerminateProcess (GetCurrentProcess (), exitcode))
system_printf ("TerminateProcess failed, %E");
ExitProcess (exitcode);
}
# undef self
/* Return next free Cygwin PID between 2 and 65535, round-robin. Each new
PID is checked that it doesn't collide with an existing PID. For that,
just check if the "cygpid.PID" section exists. */
pid_t
create_cygwin_pid ()
{
pid_t pid = 0;
WCHAR sym_name[24];
UNICODE_STRING sym_str;
OBJECT_ATTRIBUTES attr;
HANDLE sym_hdl;
NTSTATUS status;
do
{
do
{
pid = ((uint32_t) InterlockedIncrement (&cygwin_shared->pid_src))
% MAX_PID;
}
while (pid < 2);
__small_swprintf (sym_name, L"cygpid.%u", pid);
RtlInitUnicodeString (&sym_str, sym_name);
InitializeObjectAttributes (&attr, &sym_str, OBJ_CASE_INSENSITIVE,
get_shared_parent_dir (), NULL);
/* We just want to know if the section (and thus the process) still
exists. Instead of actually opening the section, try to open
it as symlink. NtOpenSymbolicLinkObject will always returns an
error:
- STATUS_OBJECT_NAME_NOT_FOUND if the section doesn't exist,
so the slot is free and we can use this pid.
- STATUS_OBJECT_TYPE_MISMATCH if the section exists, so we have
to skip this pid and loop to try the next one.
As side-effect we never have to close the section handle and thus
we don't influence the lifetime of the section. */
status = NtOpenSymbolicLinkObject (&sym_hdl, SYMBOLIC_LINK_QUERY, &attr);
}
while (status == STATUS_OBJECT_TYPE_MISMATCH);
return pid;
}
/* Convert Windows WINPID into Cygwin PID. Utilize the "winpid.WINPID"
symlinks created for each process. The symlink contains the Cygwin
PID as target. Return 0 if no "winpid.WINPID" symlink exists for
this WINPID. */
pid_t
cygwin_pid (DWORD dwProcessId)
{
WCHAR sym_name[24];
WCHAR pid_name[12];
UNICODE_STRING sym_str;
UNICODE_STRING pid_str;
OBJECT_ATTRIBUTES attr;
HANDLE sym_hdl;
NTSTATUS status;
__small_swprintf (sym_name, L"winpid.%u", dwProcessId);
RtlInitUnicodeString (&sym_str, sym_name);
InitializeObjectAttributes (&attr, &sym_str, OBJ_CASE_INSENSITIVE,
get_shared_parent_dir (), NULL);
status = NtOpenSymbolicLinkObject (&sym_hdl, SYMBOLIC_LINK_QUERY, &attr);
if (!NT_SUCCESS (status))
return 0;
RtlInitEmptyUnicodeString (&pid_str, pid_name,
sizeof pid_name - sizeof (WCHAR));
status = NtQuerySymbolicLinkObject (sym_hdl, &pid_str, NULL);
NtClose (sym_hdl);
if (!NT_SUCCESS (status))
{
system_printf ("NtOpenSymbolicLinkObject: %y, PID %u, ret 0",
status, dwProcessId);
return 0;
}
pid_str.Buffer[pid_str.Length / sizeof (WCHAR)] = L'\0';
pid_t ret = (pid_t) wcstoul (pid_str.Buffer, NULL, 10);
return ret;
}
/* Create "winpid.WINPID" symlinks with the Cygwin PID of that process as
target. This is used to find the Cygwin PID for a given Windows WINPID. */
void
pinfo::create_winpid_symlink ()
{
WCHAR sym_name[24];
WCHAR pid_name[24];
UNICODE_STRING sym_str;
UNICODE_STRING pid_str;
OBJECT_ATTRIBUTES attr;
__small_swprintf (sym_name, L"winpid.%u", procinfo->dwProcessId);
RtlInitUnicodeString (&sym_str, sym_name);
__small_swprintf (pid_name, L"%u", procinfo->pid);
RtlInitUnicodeString (&pid_str, pid_name);
InitializeObjectAttributes (&attr, &sym_str, OBJ_CASE_INSENSITIVE,
get_shared_parent_dir (),
everyone_sd (SYMBOLIC_LINK_QUERY));
NtCreateSymbolicLinkObject (&winpid_hdl, SYMBOLIC_LINK_ALL_ACCESS,
&attr, &pid_str);
}
inline void
pinfo::_pinfo_release ()
{
if (procinfo)
{
void *unmap_procinfo = procinfo;
procinfo = NULL;
UnmapViewOfFile (unmap_procinfo);
}
HANDLE close_h;
if (h)
{
close_h = h;
h = NULL;
ForceCloseHandle1 (close_h, pinfo_shared_handle);
}
}
void
pinfo::init (pid_t n, DWORD flag, HANDLE h0)
{
shared_locations shloc;
h = NULL;
if (myself && n == myself->pid)
{
procinfo = myself;
destroy = 0;
return;
}
int createit = (flag & PID_IN_USE);
DWORD access = FILE_MAP_READ
| (flag & (PID_IN_USE | PID_MAP_RW) ? FILE_MAP_WRITE : 0);
if (!h0 || myself.h)
shloc = (flag & PID_IN_USE) ? SH_JUSTCREATE : SH_JUSTOPEN;
else
{
shloc = SH_MYSELF;
if (h0 == INVALID_HANDLE_VALUE)
h0 = NULL;
}
procinfo = NULL;
PSECURITY_ATTRIBUTES sa_buf = (PSECURITY_ATTRIBUTES) alloca (1024);
PSECURITY_ATTRIBUTES sec_attribs = sec_user_nih (sa_buf, cygheap->user.sid(),
well_known_world_sid,
FILE_MAP_READ);
for (int i = 0; i < 20; i++)
{
bool created;
procinfo = (_pinfo *) open_shared (L"cygpid", n, h0, sizeof (_pinfo),
shloc, created, sec_attribs, access);
if (!h0)
{
if (createit)
__seterrno ();
return;
}
if (!procinfo)
{
if (exit_state)
return;
if (GetLastError () == ERROR_INVALID_HANDLE)
api_fatal ("MapViewOfFileEx h0 %p, i %d failed, %E", h0, i);
debug_printf ("MapViewOfFileEx h0 %p, i %d failed, %E", h0, i);
yield ();
continue;
}
/* Just fetching info for ps or /proc, don't do anything rash. */
if (!created && !(flag & PID_NEW) && !procinfo->ppid
&& (flag & PID_PROCINFO))
break;
if (!created && createit && (procinfo->process_state & PID_REAPED))
{
memset (procinfo, 0, sizeof (*procinfo));
created = true; /* Lie that we created this - just reuse old
shared memory */
}
if (procinfo->process_state & PID_REAPED)
{
set_errno (ESRCH);
break;
}
/* In certain 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. */
if (!created && createit
&& (procinfo->process_state & (PID_EXITED | PID_REAPED)))
{
debug_printf ("looping because pid %d, procinfo->pid %d, "
"procinfo->dwProcessid %u has PID_EXITED|PID_REAPED set",
n, procinfo->pid, procinfo->dwProcessId);
goto loop;
}
if (flag & PID_NEW)
procinfo->start_time = time (NULL);
if (created)
procinfo->pid = n;
h = h0; /* Success! */
break;
loop:
_pinfo_release ();
if (h0)
yield ();
}
if (h)
{
destroy = 1;
ProtectHandle1 (h, pinfo_shared_handle);
}
else
{
h = h0;
_pinfo_release ();
}
if (shloc == SH_MYSELF)
cygheap->shared_regions.myself_shared_addr = procinfo;
}
void
pinfo::set_acl()
{
PACL acl_buf = (PACL) alloca (1024);
SECURITY_DESCRIPTOR sd;
NTSTATUS status;
sec_acl (acl_buf, true, true, cygheap->user.sid (),
well_known_world_sid, FILE_MAP_READ);
RtlCreateSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
status = RtlSetDaclSecurityDescriptor (&sd, TRUE, acl_buf, FALSE);
if (!NT_SUCCESS (status))
debug_printf ("RtlSetDaclSecurityDescriptor %y", status);
else if ((status = NtSetSecurityObject (h, DACL_SECURITY_INFORMATION, &sd)))
debug_printf ("NtSetSecurityObject %y", status);
}
void
pinfo_minimal::set_inheritance (bool inherit)
{
DWORD i_flag = inherit ? HANDLE_FLAG_INHERIT : 0;
SetHandleInformation (rd_proc_pipe, HANDLE_FLAG_INHERIT, i_flag);
SetHandleInformation (hProcess, HANDLE_FLAG_INHERIT, i_flag);
SetHandleInformation (h, HANDLE_FLAG_INHERIT, i_flag);
}
pinfo::pinfo (HANDLE parent, pinfo_minimal& from, pid_t pid):
pinfo_minimal (), destroy (false), procinfo (NULL), waiter_ready (false),
wait_thread (NULL)
{
/* cygheap_exec_info::record_children set the inheritance of the required
child handles so just copy them over... */
rd_proc_pipe = from.rd_proc_pipe;
hProcess = from.hProcess;
h = from.h;
/* ...and reset their inheritance. */
set_inheritance (false);
init (pid, PID_MAP_RW, h);
}
const char *
_pinfo::_ctty (char *buf)
{
if (!CTTY_IS_VALID (ctty))
strcpy (buf, "no ctty");
else
{
device d;
d.parse (ctty);
__small_sprintf (buf, "ctty %s", d.name ());
}
return buf;
}
bool
_pinfo::set_ctty (fhandler_termios *fh, int flags)
{
tty_min& tc = *fh->tc ();
debug_printf ("old %s, ctty device number %y, tc.ntty device number %y flags & O_NOCTTY %y", __ctty (), ctty, tc.ntty, flags & O_NOCTTY);
if (fh && (!CTTY_IS_VALID (ctty) || ctty == tc.ntty) && !(flags & O_NOCTTY))
{
if (tc.getsid () && tc.getsid () != sid && ctty == CTTY_RELEASED)
; /* Do nothing if another session is associated with the TTY. */
else
{
ctty = tc.ntty;
if (cygheap->ctty != fh->archetype)
{
debug_printf ("cygheap->ctty %p, archetype %p",
cygheap->ctty, fh->archetype);
if (!cygheap->ctty)
syscall_printf ("ctty was NULL");
else
{
syscall_printf ("ctty %p, usecount %d", cygheap->ctty,
cygheap->ctty->archetype_usecount (0));
cygheap->ctty->close ();
}
cygheap->ctty = (fhandler_termios *) fh->archetype;
if (cygheap->ctty)
{
fh->archetype_usecount (1);
/* guard ctty fh */
report_tty_counts (cygheap->ctty, "ctty", "");
}
}
}
lock_ttys here;
syscall_printf ("attaching %s sid %d, pid %d, pgid %d, tty->pgid %d, tty->sid %d",
__ctty (), sid, pid, pgid, tc.getpgid (), tc.getsid ());
if (!cygwin_finished_initializing && !myself->cygstarted
&& pgid == pid && tc.getpgid () && tc.getsid ()
/* Even GDB starts app via CreateProcess which changes cygstarted.
This results in setting the wrong pgid here, so just skip this
under debugger. */
&& !being_debugged ())
pgid = tc.getpgid ();
/* May actually need to do this:
if (sid == pid && !tc.getsid () || !procinfo (tc.getsid ())->exists)
but testing for process existence is expensive so we avoid it until
an obvious bug surfaces. */
if (sid == pid && !tc.getsid ())
tc.setsid (sid);
if (CTTY_IS_VALID (ctty))
sid = tc.getsid ();
/* See above */
if ((!tc.getpgid () || being_debugged ()) && pgid == pid)
tc.setpgid (pgid);
}
debug_printf ("cygheap->ctty now %p, archetype %p", cygheap->ctty, fh ? fh->archetype : NULL);
return CTTY_IS_VALID (ctty);
}
/* Test to determine if a process really exists and is processing signals.
*/
bool
_pinfo::exists ()
{
return process_state && !(process_state & (PID_EXITED | PID_REAPED));
}
bool
_pinfo::alive ()
{
HANDLE h = OpenProcess (PROCESS_QUERY_LIMITED_INFORMATION, false,
dwProcessId);
if (h)
CloseHandle (h);
return !!h;
}
static commune_result
commune_process_siginfo ()
{
commune_result res = { 0 };
res.pnd = sig_send (myself, __SIGPENDINGALL, NULL);
res.blk = cygheap->compute_sigblkmask ();
for (int sig = 1; sig < NSIG; ++sig)
if (global_sigs[sig].sa_handler == SIG_IGN)
res.ign |= SIGTOMASK (sig);
return res;
}
DWORD
commune_process (void *arg)
{
siginfo_t& si = *((siginfo_t *) arg);
tmp_pathbuf tp;
char *path = tp.c_get ();
DWORD nr;
HANDLE& tothem = si._si_commune._si_write_handle;
HANDLE process_sync =
OpenSemaphore (SYNCHRONIZE, false, shared_name (path, "commune", si.si_pid));
if (process_sync) // FIXME: this test shouldn't be necessary
ProtectHandle (process_sync);
lock_process now;
if (si._si_commune._si_code & PICOM_EXTRASTR)
si._si_commune._si_str = (char *) (&si + 1);
switch (si._si_commune._si_code)
{
case PICOM_CMDLINE:
{
sigproc_printf ("processing PICOM_CMDLINE");
unsigned n = 0;
const char *argv[__argc_safe + 1];
for (int i = 0; i < __argc_safe; i++)
{
if (IsBadStringPtr (__argv[i], INT32_MAX))
argv[i] = "";
else
argv[i] = __argv[i];
n += strlen (argv[i]) + 1;
}
argv[__argc_safe] = NULL;
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
{
/*__seterrno ();*/ // this is run from the signal thread, so don't set errno
sigproc_printf ("WritePipeOverlapped sizeof argv failed, %E");
}
else
for (const char **a = argv; *a; a++)
if (!WritePipeOverlapped (tothem, *a, strlen (*a) + 1, &nr, 1000L))
{
sigproc_printf ("WritePipeOverlapped arg %d failed, %E",
a - argv);
break;
}
break;
}
case PICOM_CWD:
{
sigproc_printf ("processing PICOM_CWD");
unsigned int n = strlen (cygheap->cwd.get (path, 1, 1, NT_MAX_PATH)) + 1;
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof cwd failed, %E");
else if (!WritePipeOverlapped (tothem, path, n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped cwd failed, %E");
break;
}
case PICOM_ROOT:
{
sigproc_printf ("processing PICOM_ROOT");
unsigned n;
if (cygheap->root.exists ())
n = strlen (strcpy (path, cygheap->root.posix_path ())) + 1;
else
n = strlen (strcpy (path, "/")) + 1;
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof root failed, %E");
else if (!WritePipeOverlapped (tothem, path, n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped root failed, %E");
break;
}
case PICOM_SIGINFO:
{
sigproc_printf ("processing PICOM_SIGINFO");
commune_result cr = commune_process_siginfo ();
if (!WritePipeOverlapped (tothem, &cr, sizeof cr, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped siginfo 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 (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof fds failed, %E");
else
while ((fd = cfd.next ()) >= 0)
if (!WritePipeOverlapped (tothem, &fd, sizeof fd, &nr, 1000L))
{
sigproc_printf ("WritePipeOverlapped fd %d failed, %E", fd);
break;
}
break;
}
case PICOM_PIPE_FHANDLER:
{
sigproc_printf ("processing PICOM_PIPE_FHANDLER");
int64_t unique_id = si._si_commune._si_pipe_unique_id;
unsigned int n = 0;
cygheap_fdenum cfd;
while (cfd.next () >= 0)
if (cfd->get_unique_id () == unique_id)
{
fhandler_pipe *fh = cfd;
n = sizeof *fh;
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof hdl failed, %E");
else if (!WritePipeOverlapped (tothem, fh, n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped hdl failed, %E");
break;
}
if (!n && !WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof hdl failed, %E");
break;
}
case PICOM_FILE_PATHCONV:
{
sigproc_printf ("processing PICOM_FILE_PATHCONV");
int fd = si._si_commune._si_fd;
uint32_t flags = si._si_commune._si_flags;
unsigned int n = 0;
cygheap_fdget cfd (fd);
if (cfd >= 0
&& (!(flags & FFH_LINKAT)
|| (cfd->get_flags () & (O_TMPFILE | O_EXCL))
!= (O_TMPFILE | O_EXCL)))
{
fhandler_base *fh = cfd;
void *ser_buf = fh->pc.serialize (fh->get_handle (), n);
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof hdl failed, %E");
else if (!WritePipeOverlapped (tothem, ser_buf, n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped hdl failed, %E");
cfree (ser_buf);
}
else if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped 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 (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof fd failed, %E");
else if (!WritePipeOverlapped (tothem, path, n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped fd failed, %E");
break;
}
case PICOM_ENVIRON:
{
sigproc_printf ("processing PICOM_ENVIRON");
unsigned n = 0;
char **env = environ;
if (env)
for (char **e = env; *e; e++)
n += strlen (*e) + 1;
if (!WritePipeOverlapped (tothem, &n, sizeof n, &nr, 1000L))
sigproc_printf ("WritePipeOverlapped sizeof argv failed, %E");
else if (env)
for (char **e = env; *e; e++)
if (!WritePipeOverlapped (tothem, *e, strlen (*e) + 1, &nr, 1000L))
{
sigproc_printf ("WritePipeOverlapped arg %d failed, %E",
e - env);
break;
}
break;
}
}
if (process_sync)
{
DWORD res = WaitForSingleObject (process_sync, 5000);
if (res != WAIT_OBJECT_0)
sigproc_printf ("WFSO failed - %u, %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 = { 0 };
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;
if (!pid)
{
set_errno (ESRCH);
goto err;
}
if (ISSTATE (this, PID_NOTCYGWIN))
{
set_errno (ENOTSUP);
goto err;
}
va_start (args, code);
si._si_commune._si_code = code;
switch (code)
{
case PICOM_PIPE_FHANDLER:
si._si_commune._si_pipe_unique_id = va_arg (args, int64_t);
break;
case PICOM_FD:
case PICOM_FILE_PATHCONV:
si._si_commune._si_fd = va_arg (args, int);
si._si_commune._si_flags = va_arg (args, uint32_t);
break;
break;
}
va_end (args);
char name_buf[MAX_PATH];
request_sync = CreateSemaphore (&sec_none_nih, 0, INT32_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;
}
DWORD n;
switch (code)
{
case PICOM_CMDLINE:
case PICOM_CWD:
case PICOM_ENVIRON:
case PICOM_ROOT:
case PICOM_FDS:
case PICOM_FD:
case PICOM_PIPE_FHANDLER:
case PICOM_FILE_PATHCONV:
if (!ReadPipeOverlapped (fromthem, &n, sizeof n, &nr, 1000L)
|| 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 && ReadPipeOverlapped (fromthem, p, n, &nr, 1000L);
p += nr, n -= nr)
continue;
if (n)
{
__seterrno ();
goto err;
}
res.n = p - res.s;
}
break;
case PICOM_SIGINFO:
if (!ReadPipeOverlapped (fromthem, &res, sizeof res, &nr, 1000L)
|| nr != sizeof res)
{
__seterrno ();
goto err;
}
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 (int64_t unique_id, size_t &n)
{
if (!pid)
return NULL;
if (pid == myself->pid)
return NULL;
commune_result cr = commune_request (PICOM_PIPE_FHANDLER, unique_id);
n = cr.n;
return (fhandler_pipe *) cr.s;
}
void *
_pinfo::file_pathconv (int fd, uint32_t flags, size_t &n)
{
if (!pid)
return NULL;
if (pid == myself->pid)
return NULL;
commune_result cr = commune_request (PICOM_FILE_PATHCONV, fd, flags);
n = cr.n;
return (void *) cr.s;
}
char *
_pinfo::fd (int fd, size_t &n)
{
char *s;
if (!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 (!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;