/* 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 #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; DWORD flags = PID_IN_USE | PID_ACTIVE; /* Forked process or process started from non-Cygwin parent needs a pid. */ if (!h) { 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); 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 __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. */ myself.thisproc (NULL); myself->pgid = myself->sid = myself->pid; myself->ctty = -1; 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); 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 (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; 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 (myself->ctty > 0 && !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++) { procinfo = (_pinfo *) open_shared (L"cygpid", n, h0, sizeof (_pinfo), &shloc, 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; } bool created = shloc != SH_JUSTOPEN; /* 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 (); } } 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 <= 0) 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 <= 0 || ctty == tc.ntty) && !(flags & O_NOCTTY)) { 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); 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 > 0; } /* Test to determine if a process really exists and is processing signals. */ bool __reg1 _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; } DWORD WINAPI 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_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 = cur_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; 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; res.s = NULL; res.n = 0; 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; } 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; 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 (!pid) return NULL; if (pid != myself->pid && !ISSTATE (this, PID_NOTCYGWIN)) { 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; } static HANDLE open_commune_proc_parms (DWORD pid, PRTL_USER_PROCESS_PARAMETERS prupp) { HANDLE proc; NTSTATUS status; PROCESS_BASIC_INFORMATION pbi; PEB lpeb; proc = OpenProcess (PROCESS_QUERY_LIMITED_INFORMATION | PROCESS_VM_READ, FALSE, pid); if (!proc) return NULL; status = NtQueryInformationProcess (proc, ProcessBasicInformation, &pbi, sizeof pbi, NULL); if (NT_SUCCESS (status) && ReadProcessMemory (proc, pbi.PebBaseAddress, &lpeb, sizeof lpeb, NULL) && ReadProcessMemory (proc, lpeb.ProcessParameters, prupp, sizeof *prupp, NULL)) return proc; NtClose (proc); return NULL; } char * _pinfo::cwd (size_t& n) { char *s = NULL; if (!pid) return NULL; if (ISSTATE (this, PID_NOTCYGWIN)) { RTL_USER_PROCESS_PARAMETERS rupp; HANDLE proc = open_commune_proc_parms (dwProcessId, &rupp); n = 0; if (!proc) return NULL; tmp_pathbuf tp; PWCHAR cwd = tp.w_get (); if (ReadProcessMemory (proc, rupp.CurrentDirectoryName.Buffer, cwd, rupp.CurrentDirectoryName.Length, NULL)) { /* Drop trailing backslash, add trailing \0 in passing. */ cwd[rupp.CurrentDirectoryName.Length / sizeof (WCHAR) - 1] = L'\0'; s = (char *) cmalloc_abort (HEAP_COMMUNE, NT_MAX_PATH); mount_table->conv_to_posix_path (cwd, s, 0); n = strlen (s) + 1; } NtClose (proc); } else 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 = NULL; if (!pid) return NULL; if (ISSTATE (this, PID_NOTCYGWIN)) { RTL_USER_PROCESS_PARAMETERS rupp; HANDLE proc = open_commune_proc_parms (dwProcessId, &rupp); n = 0; if (!proc) return NULL; tmp_pathbuf tp; PWCHAR cmdline = tp.w_get (); if (ReadProcessMemory (proc, rupp.CommandLine.Buffer, cmdline, rupp.CommandLine.Length, NULL)) { /* Add trailing \0. */ cmdline[rupp.CommandLine.Length / sizeof (WCHAR)] = L'\0'; n = sys_wcstombs_alloc (&s, HEAP_COMMUNE, cmdline, rupp.CommandLine.Length / sizeof (WCHAR)); /* Quotes & Spaces post-processing. */ bool in_quote = false; for (char *c = s; *c; ++c) if (*c == '"') in_quote = !in_quote; else if (*c == ' ' && !in_quote) *c = '\0'; } NtClose (proc); } else 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; } char * _pinfo::environ (size_t& n) { char **env = NULL; if (!pid) return NULL; if (ISSTATE (this, PID_NOTCYGWIN)) { RTL_USER_PROCESS_PARAMETERS rupp; HANDLE proc = open_commune_proc_parms (dwProcessId, &rupp); if (!proc) return NULL; MEMORY_BASIC_INFORMATION mbi; SIZE_T envsize; PWCHAR envblock; if (!VirtualQueryEx (proc, rupp.Environment, &mbi, sizeof(mbi))) { NtClose (proc); return NULL; } SIZE_T read; envsize = (ptrdiff_t) mbi.RegionSize - ((ptrdiff_t) rupp.Environment - (ptrdiff_t) mbi.BaseAddress); envblock = (PWCHAR) cmalloc_abort (HEAP_COMMUNE, envsize); if (ReadProcessMemory (proc, rupp.Environment, envblock, envsize, &read)) env = win32env_to_cygenv (envblock, false); NtClose (proc); } else if (pid != myself->pid) { commune_result cr = commune_request (PICOM_ENVIRON); n = cr.n; return cr.s; } else env = cur_environ (); if (env == NULL) return NULL; n = 0; for (char **e = env; *e; e++) n += strlen (*e) + 1; char *p, *s; p = s = (char *) cmalloc_abort (HEAP_COMMUNE, n); for (char **e = env; *e; e++) { strcpy (p, *e); 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; bool its_me = vchild == myself; 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; } if (!its_me && have_execed_cygwin) break; si.si_uid = vchild->uid; switch (buf) { case __ALERT_ALIVE: continue; case 0: /* Child exited. Do some cleanup and signal myself. */ 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; } if (its_me && ch_spawn.signal_myself_exited ()) 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; } /* function to set up the process pipe and kick off proc_waiter */ bool pinfo::wait () { 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, "waitproc"); 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 %y, rd_proc_pipe %p", (*this)->pid, (*this)->dwProcessId, rd_proc_pipe); } return true; } /* 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 (my_wr_proc_pipe) { if (WriteFile (my_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 = my_wr_proc_pipe; my_wr_proc_pipe = NULL; ForceCloseHandle1 (closeit, wr_proc_pipe); } } return (bool) nb; } void pinfo::release () { _pinfo_release (); if (winpid_hdl) NtClose (winpid_hdl); HANDLE close_h; if (rd_proc_pipe) { close_h = rd_proc_pipe; rd_proc_pipe = NULL; ForceCloseHandle1 (close_h, rd_proc_pipe); } if (hProcess) { close_h = hProcess; hProcess = NULL; ForceCloseHandle1 (close_h, childhProc); } } /* DOCTOOL-START cygwin_winpid_to_pid extern "C" pid_t cygwin_winpid_to_pid int winpid Given a windows pid, converts to the corresponding Cygwin pid, if any. Returns -1 if windows pid does not correspond to a cygwin pid. Example use of cygwin_winpid_to_pid extern "C" cygwin_winpid_to_pid (int winpid); pid_t mypid; mypid = cygwin_winpid_to_pid (windows_pid); DOCTOOL-END */ extern "C" pid_t cygwin_winpid_to_pid (int winpid) { pinfo p (cygwin_pid (winpid)); if (p) return p->pid; set_errno (ESRCH); return (pid_t) -1; } #define slop_pidlist 200 #define size_pidlist(i) (sizeof (pidlist[0]) * ((i) + 1)) #define size_pinfolist(i) (sizeof (pinfolist[0]) * ((i) + 1)) class _onreturn { HANDLE h; public: ~_onreturn () { if (h) { CloseHandle (h); } } void no_close_handle (pinfo& p) { p.hProcess = h; h = NULL; } _onreturn (): h (NULL) {} void operator = (HANDLE h0) {h = h0;} operator HANDLE () const {return h;} }; inline void winpids::add (DWORD& nelem, bool winpid, DWORD pid) { pid_t cygpid = cygwin_pid (pid); if (nelem >= npidlist) { npidlist += slop_pidlist; pidlist = (DWORD *) realloc (pidlist, size_pidlist (npidlist + 1)); pinfolist = (pinfo *) realloc ((void *) pinfolist, size_pinfolist (npidlist + 1)); } _onreturn onreturn; pinfo& p = pinfolist[nelem]; memset ((void *) &p, 0, sizeof (p)); bool perform_copy; if (cygpid == myself->pid) { p = myself; perform_copy = false; } else { /* Open a process to prevent a subsequent exit from invalidating the shared memory region. */ onreturn = OpenProcess (PROCESS_QUERY_LIMITED_INFORMATION, false, pid); /* If we couldn't open the process then we don't have rights to it and should make a copy of the shared memory area when it exists (it may not). */ perform_copy = onreturn ? make_copy : true; p.init (cygpid, PID_PROCINFO | pinfo_access, NULL); } /* Did we catch the process during exec? Try to fix. */ if (p && p->dwProcessId != pid) pid = p->dwProcessId; /* If we're just looking for winpids then don't do any special cygwin "stuff* */ if (winpid) { perform_copy = true; goto out; } /* !p means that we couldn't find shared memory for this pid. Probably means that it isn't a cygwin process. */ if (!p) { if (!pinfo_access || !cygpid) return; p.init (cygpid, PID_PROCINFO, NULL); if (!p) return; } out: /* Scan list of previously recorded pids to make sure that this pid hasn't shown up before. This can happen when a process execs. */ for (unsigned i = 0; i < nelem; i++) if (pidlist[i] == pid) { if (p && (_pinfo *) p != (_pinfo *) myself) p.release (); return; } /* If p is "false" then, eventually any opened process handle will be closed and the function will exit without adding anything to the pid list. If p is "true" then we've discovered a cygwin process. Handle "myself" differently. Don't copy it and close/zero the handle we just opened to it. If not performing a copy, then keep the process handle open for the duration of the life of the procinfo region to potential races when a new process uses this pid. Otherwise, malloc some memory for a copy of the shared memory. If malloc failed, then "oh well". Just keep the shared memory around and eventually close the handle when the winpids goes out of scope. If malloc succeeds, copy the procinfo we just grabbed into the new region, release the shared memory and allow the handle to be closed when this function returns. */ if (p) { if (p == (_pinfo *) myself) /* handle specially. Close the handle but (eventually) don't deallocate procinfo in release call */; else if (!perform_copy) onreturn.no_close_handle (p); /* Don't close the handle until release */ else { _pinfo *pnew = (_pinfo *) malloc (sizeof (*p.procinfo)); if (!pnew) onreturn.no_close_handle (p); else { *pnew = *p.procinfo; p.release (); p.procinfo = pnew; p.destroy = false; if (winpid) p->dwProcessId = pid; } } } /* Add pid to the list and bump the number of elements. */ if (p || winpid) pidlist[nelem++] = pid; } DWORD winpids::enum_processes (bool winpid) { DWORD nelem = 0; if (!winpid) { tmp_pathbuf tp; NTSTATUS status; HANDLE dir = get_shared_parent_dir (); BOOLEAN restart = TRUE; bool last_run = false; ULONG context = 0; PDIRECTORY_BASIC_INFORMATION dbi_buf = (PDIRECTORY_BASIC_INFORMATION) tp.w_get (); while (!last_run) { status = NtQueryDirectoryObject (dir, dbi_buf, 65536, FALSE, restart, &context, NULL); if (!NT_SUCCESS (status)) { debug_printf ("NtQueryDirectoryObject, status %y", status); break; } if (status != STATUS_MORE_ENTRIES) last_run = true; restart = FALSE; for (PDIRECTORY_BASIC_INFORMATION dbi = dbi_buf; dbi->ObjectName.Length > 0; dbi++) { if (wcsncmp (dbi->ObjectName.Buffer, L"winpid.", 7) == 0) { DWORD pid = wcstoul (dbi->ObjectName.Buffer + 7, NULL, 10); add (nelem, false, pid); } } } } else { static DWORD szprocs; static PSYSTEM_PROCESS_INFORMATION procs; while (1) { PSYSTEM_PROCESS_INFORMATION new_p = (PSYSTEM_PROCESS_INFORMATION) realloc (procs, szprocs += 200 * sizeof (*procs)); if (!new_p) { system_printf ("out of memory reading system process " "information"); return 0; } procs = new_p; NTSTATUS status = NtQuerySystemInformation (SystemProcessInformation, procs, szprocs, NULL); if (NT_SUCCESS (status)) break; if (status != STATUS_INFO_LENGTH_MISMATCH) { system_printf ("error %y reading system process information", status); return 0; } } PSYSTEM_PROCESS_INFORMATION px = procs; while (1) { if (px->UniqueProcessId) add (nelem, true, (DWORD) (uintptr_t) px->UniqueProcessId); if (!px->NextEntryOffset) break; px = (PSYSTEM_PROCESS_INFORMATION) ((char *) px + px->NextEntryOffset); } } return nelem; } void winpids::set (bool winpid) { npids = enum_processes (winpid); if (pidlist) pidlist[npids] = 0; } DWORD winpids::enum_init (bool winpid) { return enum_processes (winpid); } void winpids::release () { _pinfo *p; for (unsigned i = 0; i < npids; i++) if (pinfolist[i] == (_pinfo *) myself) continue; else if (pinfolist[i].hProcess) pinfolist[i].release (); else if ((p = pinfolist[i])) { pinfolist[i].procinfo = NULL; free (p); } } winpids::~winpids () { if (npidlist) { release (); free (pidlist); free (pinfolist); } }