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newlib/winsup/cygwin/spawn.cc

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/* spawn.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.
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 <unistd.h>
#include <process.h>
#include <sys/wait.h>
#include <wchar.h>
#include <ctype.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "security.h"
#include "sigproc.h"
#include "pinfo.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "child_info.h"
#include "environ.h"
#include "cygtls.h"
#include "tls_pbuf.h"
#include "winf.h"
#include "ntdll.h"
static const suffix_info exe_suffixes[] =
{
suffix_info ("", 1),
suffix_info (".exe", 1),
suffix_info (".com"),
suffix_info (NULL)
};
/* Add .exe to PROG if not already present and see if that exists.
If not, return PROG (converted from posix to win32 rules if necessary).
The result is always BUF.
Returns (possibly NULL) suffix */
static const char *
perhaps_suffix (const char *prog, path_conv& buf, int& err, unsigned opt)
{
const char *ext;
err = 0;
debug_printf ("prog '%s'", prog);
buf.check (prog, PC_SYM_FOLLOW | PC_NULLEMPTY,
(opt & FE_DLL) ? stat_suffixes : exe_suffixes);
if (buf.isdir ())
{
err = EACCES;
ext = NULL;
}
else if (!buf.exists ())
{
err = ENOENT;
ext = NULL;
}
else if (buf.known_suffix)
ext = buf.get_win32 () + (buf.known_suffix - buf.get_win32 ());
else
ext = strchr (buf.get_win32 (), '\0');
debug_printf ("buf %s, suffix found '%s'", (char *) buf.get_win32 (), ext);
return ext;
}
/* Find an executable name, possibly by appending known executable
suffixes to it. The win32-translated name is placed in 'buf'.
Any found suffix is returned in known_suffix.
If the file is not found and !null_if_not_found then the win32 version
of name is placed in buf and returned. Otherwise the contents of buf
is undefined and NULL is returned. */
const char * __reg3
find_exec (const char *name, path_conv& buf, const char *mywinenv,
unsigned opt, const char **known_suffix)
{
const char *suffix = "";
debug_printf ("find_exec (%s)", name);
const char *retval;
tmp_pathbuf tp;
char *tmp = tp.c_get ();
const char *posix = (opt & FE_NATIVE) ? NULL : name;
bool has_slash = !!strpbrk (name, "/\\");
int err = 0;
/* Check to see if file can be opened as is first.
Win32 systems always check . first, but PATH may not be set up to
do this. */
if ((has_slash || opt & FE_CWD)
&& (suffix = perhaps_suffix (name, buf, err, opt)) != NULL)
{
if (posix && !has_slash)
{
tmp[0] = '.';
tmp[1] = '/';
strcpy (tmp + 2, name);
posix = tmp;
}
retval = buf.get_win32 ();
goto out;
}
win_env *winpath;
const char *path;
const char *posix_path;
posix = (opt & FE_NATIVE) ? NULL : tmp;
if (strchr (mywinenv, '/'))
{
/* it's not really an environment variable at all */
int n = cygwin_conv_path_list (CCP_POSIX_TO_WIN_A, mywinenv, NULL, 0);
char *s = (char *) alloca (n);
if (cygwin_conv_path_list (CCP_POSIX_TO_WIN_A, mywinenv, s, n))
goto errout;
path = s;
posix_path = mywinenv - 1;
}
else if (has_slash || strchr (name, '\\') || isdrive (name)
|| !(winpath = getwinenv (mywinenv))
|| !(path = winpath->get_native ()) || *path == '\0')
/* Return the error condition if this is an absolute path or if there
is no PATH to search. */
goto errout;
else
posix_path = winpath->get_posix () - 1;
debug_printf ("%s%s", mywinenv, path);
/* Iterate over the specified path, looking for the file with and without
executable extensions. */
do
{
posix_path++;
char *eotmp = strccpy (tmp, &path, ';');
/* An empty path or '.' means the current directory, but we've
already tried that. */
if (opt & FE_CWD && (tmp[0] == '\0' || (tmp[0] == '.' && tmp[1] == '\0')))
continue;
*eotmp++ = '\\';
strcpy (eotmp, name);
debug_printf ("trying %s", tmp);
int err1;
if ((suffix = perhaps_suffix (tmp, buf, err1, opt)) != NULL)
{
if (buf.has_acls () && check_file_access (buf, X_OK, true))
continue;
if (posix == tmp)
{
eotmp = strccpy (tmp, &posix_path, ':');
if (eotmp == tmp)
*eotmp++ = '.';
*eotmp++ = '/';
strcpy (eotmp, name);
}
retval = buf.get_win32 ();
goto out;
}
}
while (*path && *++path && (posix_path = strchr (posix_path, ':')));
errout:
posix = NULL;
/* Couldn't find anything in the given path.
Take the appropriate action based on null_if_not_found. */
if (opt & FE_NNF)
retval = NULL;
else if (!(opt & FE_NATIVE))
retval = name;
else
{
buf.check (name);
retval = buf.get_win32 ();
}
out:
if (posix)
retval = buf.set_path (posix);
debug_printf ("%s = find_exec (%s)", (char *) buf.get_win32 (), name);
if (known_suffix)
*known_suffix = suffix ?: strchr (buf.get_win32 (), '\0');
if (!retval && err)
set_errno (err);
return retval;
}
/* Utility for child_info_spawn::worker. */
static HANDLE
handle (int fd, bool writing)
{
HANDLE h;
cygheap_fdget cfd (fd);
if (cfd < 0)
h = INVALID_HANDLE_VALUE;
else if (cfd->close_on_exec ())
h = INVALID_HANDLE_VALUE;
else if (!writing)
h = cfd->get_handle ();
else
h = cfd->get_output_handle ();
return h;
}
int
iscmd (const char *argv0, const char *what)
{
int n;
n = strlen (argv0) - strlen (what);
if (n >= 2 && argv0[1] != ':')
return 0;
return n >= 0 && strcasematch (argv0 + n, what) &&
(n == 0 || isdirsep (argv0[n - 1]));
}
#define ILLEGAL_SIG_FUNC_PTR ((_sig_func_ptr) (-2))
struct system_call_handle
{
_sig_func_ptr oldint;
_sig_func_ptr oldquit;
sigset_t oldmask;
bool is_system_call ()
{
return oldint != ILLEGAL_SIG_FUNC_PTR;
}
system_call_handle (bool issystem)
{
if (!issystem)
oldint = ILLEGAL_SIG_FUNC_PTR;
else
{
sig_send (NULL, __SIGHOLD);
oldint = NULL;
}
}
void arm()
{
if (is_system_call ())
{
sigset_t child_block;
oldint = signal (SIGINT, SIG_IGN);
oldquit = signal (SIGQUIT, SIG_IGN);
sigemptyset (&child_block);
sigaddset (&child_block, SIGCHLD);
sigprocmask (SIG_BLOCK, &child_block, &oldmask);
sig_send (NULL, __SIGNOHOLD);
}
}
~system_call_handle ()
{
if (is_system_call ())
{
signal (SIGINT, oldint);
signal (SIGQUIT, oldquit);
sigprocmask (SIG_SETMASK, &oldmask, NULL);
}
}
# undef cleanup
};
child_info_spawn NO_COPY ch_spawn;
int
child_info_spawn::worker (const char *prog_arg, const char *const *argv,
const char *const envp[], int mode,
int in__stdin, int in__stdout)
{
bool rc;
pid_t cygpid;
int res = -1;
/* Check if we have been called from exec{lv}p or spawn{lv}p and mask
mode to keep only the spawn mode. */
bool p_type_exec = !!(mode & _P_PATH_TYPE_EXEC);
mode = _P_MODE (mode);
if (prog_arg == NULL)
{
syscall_printf ("prog_arg is NULL");
set_errno (EFAULT); /* As on Linux. */
return -1;
}
if (!prog_arg[0])
{
syscall_printf ("prog_arg is empty");
set_errno (ENOENT); /* Per POSIX */
return -1;
}
syscall_printf ("mode = %d, prog_arg = %.9500s", mode, prog_arg);
/* FIXME: This is no error condition on Linux. */
if (argv == NULL)
{
syscall_printf ("argv is NULL");
set_errno (EINVAL);
return -1;
}
av newargv;
linebuf cmd;
PWCHAR envblock = NULL;
path_conv real_path;
bool reset_sendsig = false;
tmp_pathbuf tp;
PWCHAR runpath = tp.w_get ();
int c_flags;
bool null_app_name = false;
STARTUPINFOW si = {};
int looped = 0;
myfault efault;
system_call_handle system_call (mode == _P_SYSTEM);
if (efault.faulted ())
{
if (get_errno () == ENOMEM)
set_errno (E2BIG);
else
set_errno (EFAULT);
res = -1;
goto out;
}
child_info_types chtype;
if (mode == _P_OVERLAY)
chtype = _CH_EXEC;
else
chtype = _CH_SPAWN;
moreinfo = cygheap_exec_info::alloc ();
/* CreateProcess takes one long string that is the command line (sigh).
We need to quote any argument that has whitespace or embedded "'s. */
int ac;
for (ac = 0; argv[ac]; ac++)
/* nothing */;
int err;
const char *ext;
if ((ext = perhaps_suffix (prog_arg, real_path, err, FE_NADA)) == NULL)
{
set_errno (err);
res = -1;
goto out;
}
res = newargv.setup (prog_arg, real_path, ext, ac, argv, p_type_exec);
if (res)
goto out;
if (!real_path.iscygexec () && ::cygheap->cwd.get_error ())
{
small_printf ("Error: Current working directory %s.\n"
"Can't start native Windows application from here.\n\n",
::cygheap->cwd.get_error_desc ());
set_errno (::cygheap->cwd.get_error ());
res = -1;
goto out;
}
if (ac == 3 && argv[1][0] == '/' && tolower (argv[1][1]) == 'c' &&
(iscmd (argv[0], "command.com") || iscmd (argv[0], "cmd.exe")))
{
real_path.check (prog_arg);
cmd.add ("\"");
if (!real_path.error)
cmd.add (real_path.get_win32 ());
else
cmd.add (argv[0]);
cmd.add ("\"");
cmd.add (" ");
cmd.add (argv[1]);
cmd.add (" ");
cmd.add (argv[2]);
real_path.set_path (argv[0]);
null_app_name = true;
}
else
{
if (real_path.iscygexec ())
{
moreinfo->argc = newargv.argc;
moreinfo->argv = newargv;
}
if ((wincmdln || !real_path.iscygexec ())
&& !cmd.fromargv (newargv, real_path.get_win32 (),
real_path.iscygexec ()))
{
res = -1;
goto out;
}
if (mode != _P_OVERLAY || !real_path.iscygexec ()
|| !DuplicateHandle (GetCurrentProcess (), myself.shared_handle (),
GetCurrentProcess (), &moreinfo->myself_pinfo,
0, TRUE, DUPLICATE_SAME_ACCESS))
moreinfo->myself_pinfo = NULL;
else
VerifyHandle (moreinfo->myself_pinfo);
}
PROCESS_INFORMATION pi;
pi.hProcess = pi.hThread = NULL;
pi.dwProcessId = pi.dwThreadId = 0;
/* Set up needed handles for stdio */
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = handle ((in__stdin < 0 ? 0 : in__stdin), false);
si.hStdOutput = handle ((in__stdout < 0 ? 1 : in__stdout), true);
si.hStdError = handle (2, true);
si.cb = sizeof (si);
c_flags = GetPriorityClass (GetCurrentProcess ());
sigproc_printf ("priority class %d", c_flags);
c_flags |= CREATE_SEPARATE_WOW_VDM | CREATE_UNICODE_ENVIRONMENT;
if (wincap.has_program_compatibility_assistant ())
{
/* We're adding the CREATE_BREAKAWAY_FROM_JOB flag here to workaround
issues with the "Program Compatibility Assistant (PCA) Service"
starting with Windows Vista. For some reason, when starting long
running sessions from mintty(*), the affected svchost.exe process
takes more and more memory and at one point takes over the CPU. At
this point the machine becomes unresponsive. The only way to get
back to normal is to stop the entire mintty session, or to stop the
PCA service. However, a process which is controlled by PCA is part
of a compatibility job, which allows child processes to break away
from the job. This helps to avoid this issue.
First we call IsProcessInJob. It fetches the information whether or
not we're part of a job 20 times faster than QueryInformationJobObject.
(*) Note that this is not mintty's fault. It has just been observed
with mintty in the first place. See the archives for more info:
http://cygwin.com/ml/cygwin-developers/2012-02/msg00018.html */
JOBOBJECT_BASIC_LIMIT_INFORMATION jobinfo;
BOOL is_in_job;
if (IsProcessInJob (GetCurrentProcess (), NULL, &is_in_job)
&& is_in_job
&& QueryInformationJobObject (NULL, JobObjectBasicLimitInformation,
&jobinfo, sizeof jobinfo, NULL)
&& (jobinfo.LimitFlags & (JOB_OBJECT_LIMIT_BREAKAWAY_OK
| JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK)))
{
debug_printf ("Add CREATE_BREAKAWAY_FROM_JOB");
c_flags |= CREATE_BREAKAWAY_FROM_JOB;
}
}
if (mode == _P_DETACH)
c_flags |= DETACHED_PROCESS;
else
fhandler_console::need_invisible ();
if (mode != _P_OVERLAY)
myself->exec_sendsig = NULL;
else
{
/* Reset sendsig so that any process which wants to send a signal
to this pid will wait for the new process to become active.
Save the old value in case the exec fails. */
if (!myself->exec_sendsig)
{
myself->exec_sendsig = myself->sendsig;
myself->exec_dwProcessId = myself->dwProcessId;
myself->sendsig = NULL;
reset_sendsig = true;
}
}
if (null_app_name)
runpath = NULL;
else
{
USHORT len = real_path.get_nt_native_path ()->Length / sizeof (WCHAR);
if (RtlEqualUnicodePathPrefix (real_path.get_nt_native_path (),
&ro_u_natp, FALSE))
{
runpath = real_path.get_wide_win32_path (runpath);
/* If the executable path length is < MAX_PATH, make sure the long
path win32 prefix is removed from the path to make subsequent
not long path aware native Win32 child processes happy. */
if (len < MAX_PATH + 4)
{
if (runpath[5] == ':')
runpath += 4;
else if (len < MAX_PATH + 6)
*(runpath += 6) = L'\\';
}
}
else if (len < NT_MAX_PATH - ro_u_globalroot.Length / sizeof (WCHAR))
{
UNICODE_STRING rpath;
RtlInitEmptyUnicodeString (&rpath, runpath,
(NT_MAX_PATH - 1) * sizeof (WCHAR));
RtlCopyUnicodeString (&rpath, &ro_u_globalroot);
RtlAppendUnicodeStringToString (&rpath,
real_path.get_nt_native_path ());
}
else
{
set_errno (ENAMETOOLONG);
res = -1;
goto out;
}
}
cygbench ("spawn-worker");
if (!real_path.iscygexec())
::cygheap->fdtab.set_file_pointers_for_exec ();
moreinfo->envp = build_env (envp, envblock, moreinfo->envc,
real_path.iscygexec ());
if (!moreinfo->envp || !envblock)
{
set_errno (E2BIG);
res = -1;
goto out;
}
set (chtype, real_path.iscygexec ());
__stdin = in__stdin;
__stdout = in__stdout;
record_children ();
si.lpReserved2 = (LPBYTE) this;
si.cbReserved2 = sizeof (*this);
/* Depends on set call above.
Some file types might need extra effort in the parent after CreateProcess
and before copying the datastructures to the child. So we have to start
the child in suspend state, unfortunately, to avoid a race condition. */
if (!newargv.win16_exe
&& (!iscygwin () || mode != _P_OVERLAY
|| ::cygheap->fdtab.need_fixup_before ()))
c_flags |= CREATE_SUSPENDED;
/* If a native application should be spawned, we test here if the spawning
process is running in a console and, if so, if it's a foreground or
background process. If it's a background process, we start the native
process with the CREATE_NEW_PROCESS_GROUP flag set. This lets the native
process ignore Ctrl-C by default. If we don't do that, pressing Ctrl-C
in a console will break native processes running in the background,
because the Ctrl-C event is sent to all processes in the console, unless
they ignore it explicitely. CREATE_NEW_PROCESS_GROUP does that for us. */
if (!iscygwin () && fhandler_console::exists ()
&& fhandler_console::tc_getpgid () != myself->pgid)
c_flags |= CREATE_NEW_PROCESS_GROUP;
refresh_cygheap ();
if (mode == _P_DETACH)
/* all set */;
else if (mode != _P_OVERLAY || !my_wr_proc_pipe)
prefork ();
else
wr_proc_pipe = my_wr_proc_pipe;
/* Don't allow child to inherit these handles if it's not a Cygwin program.
wr_proc_pipe will be injected later. parent won't be used by the child
so there is no reason for the child to have it open as it can confuse
ps into thinking that children of windows processes are all part of
the same "execed" process.
FIXME: Someday, make it so that parent is never created when starting
non-Cygwin processes. */
if (!iscygwin ())
{
SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT, 0);
SetHandleInformation (parent, HANDLE_FLAG_INHERIT, 0);
}
/* FIXME: racy */
if (mode != _P_OVERLAY)
SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT, 0);
parent_winpid = GetCurrentProcessId ();
loop:
/* When ruid != euid we create the new process under the current original
account and impersonate in child, this way maintaining the different
effective vs. real ids.
FIXME: If ruid != euid and ruid != saved_uid we currently give
up on ruid. The new process will have ruid == euid. */
::cygheap->user.deimpersonate ();
if (!real_path.iscygexec () && mode == _P_OVERLAY)
myself->process_state |= PID_NOTCYGWIN;
wchar_t wcmd[(size_t) cmd];
if (!::cygheap->user.issetuid ()
|| (::cygheap->user.saved_uid == ::cygheap->user.real_uid
&& ::cygheap->user.saved_gid == ::cygheap->user.real_gid
&& !::cygheap->user.groups.issetgroups ()
&& !::cygheap->user.setuid_to_restricted))
{
rc = CreateProcessW (runpath, /* image name - with full path */
cmd.wcs (wcmd),/* what was passed to exec */
&sec_none_nih, /* process security attrs */
&sec_none_nih, /* thread security attrs */
TRUE, /* inherit handles from parent */
c_flags,
envblock, /* environment */
NULL,
&si,
&pi);
}
else
{
/* Give access to myself */
if (mode == _P_OVERLAY)
myself.set_acl();
WCHAR wstname[1024] = { L'\0' };
HWINSTA hwst_orig = NULL, hwst = NULL;
HDESK hdsk_orig = NULL, hdsk = NULL;
PSECURITY_ATTRIBUTES sa;
DWORD n;
hwst_orig = GetProcessWindowStation ();
hdsk_orig = GetThreadDesktop (GetCurrentThreadId ());
GetUserObjectInformationW (hwst_orig, UOI_NAME, wstname, 1024, &n);
/* Prior to Vista it was possible to start a service with the
"Interact with desktop" flag. This started the service in the
interactive window station of the console. A big security
risk, but we don't want to disable this behaviour for older
OSes because it's still heavily used by some users. They have
been warned. */
if (!::cygheap->user.setuid_to_restricted
&& wcscasecmp (wstname, L"WinSta0") != 0)
{
WCHAR sid[128];
sa = sec_user ((PSECURITY_ATTRIBUTES) alloca (1024),
::cygheap->user.sid ());
/* We're creating a window station per user, not per logon session.
First of all we might not have a valid logon session for
the user (logon by create_token), and second, it doesn't
make sense in terms of security to create a new window
station for every logon of the same user. It just fills up
the system with window stations for no good reason. */
hwst = CreateWindowStationW (::cygheap->user.get_windows_id (sid), 0,
GENERIC_READ | GENERIC_WRITE, sa);
if (!hwst)
system_printf ("CreateWindowStation failed, %E");
else if (!SetProcessWindowStation (hwst))
system_printf ("SetProcessWindowStation failed, %E");
else if (!(hdsk = CreateDesktopW (L"Default", NULL, NULL, 0,
GENERIC_ALL, sa)))
system_printf ("CreateDesktop failed, %E");
else
{
wcpcpy (wcpcpy (wstname, sid), L"\\Default");
si.lpDesktop = wstname;
debug_printf ("Desktop: %W", si.lpDesktop);
}
}
rc = CreateProcessAsUserW (::cygheap->user.primary_token (),
runpath, /* image name - with full path */
cmd.wcs (wcmd),/* what was passed to exec */
&sec_none_nih, /* process security attrs */
&sec_none_nih, /* thread security attrs */
TRUE, /* inherit handles from parent */
c_flags,
envblock, /* environment */
NULL,
&si,
&pi);
if (hwst)
{
SetProcessWindowStation (hwst_orig);
CloseWindowStation (hwst);
}
if (hdsk)
{
SetThreadDesktop (hdsk_orig);
CloseDesktop (hdsk);
}
}
if (mode != _P_OVERLAY)
SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT,
HANDLE_FLAG_INHERIT);
/* Set errno now so that debugging messages from it appear before our
final debugging message [this is a general rule for debugging
messages]. */
if (!rc)
{
__seterrno ();
syscall_printf ("CreateProcess failed, %E");
/* If this was a failed exec, restore the saved sendsig. */
if (reset_sendsig)
{
myself->sendsig = myself->exec_sendsig;
myself->exec_sendsig = NULL;
}
myself->process_state &= ~PID_NOTCYGWIN;
/* Reset handle inheritance to default when the execution of a non-Cygwin
process fails. Only need to do this for _P_OVERLAY since the handle will
be closed otherwise. Don't need to do this for 'parent' since it will
be closed in every case. See FIXME above. */
if (!iscygwin () && mode == _P_OVERLAY)
SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT,
HANDLE_FLAG_INHERIT);
if (wr_proc_pipe == my_wr_proc_pipe)
wr_proc_pipe = NULL; /* We still own it: don't nuke in destructor */
/* Restore impersonation. In case of _P_OVERLAY this isn't
allowed since it would overwrite child data. */
if (mode != _P_OVERLAY)
::cygheap->user.reimpersonate ();
res = -1;
goto out;
}
/* The CREATE_SUSPENDED case is handled below */
if (iscygwin () && !(c_flags & CREATE_SUSPENDED))
strace.write_childpid (pi.dwProcessId);
/* Fixup the parent data structures if needed and resume the child's
main thread. */
if (::cygheap->fdtab.need_fixup_before ())
::cygheap->fdtab.fixup_before_exec (pi.dwProcessId);
if (mode != _P_OVERLAY)
cygpid = cygwin_pid (pi.dwProcessId);
else
cygpid = myself->pid;
/* We print the original program name here so the user can see that too. */
syscall_printf ("pid %d, prog_arg %s, cmd line %.9500s)",
rc ? cygpid : (unsigned int) -1, prog_arg, (const char *) cmd);
/* Name the handle similarly to proc_subproc. */
ProtectHandle1 (pi.hProcess, childhProc);
if (mode == _P_OVERLAY)
{
myself->dwProcessId = pi.dwProcessId;
strace.execing = 1;
myself.hProcess = hExeced = pi.hProcess;
real_path.get_wide_win32_path (myself->progname); // FIXME: race?
sigproc_printf ("new process name %W", myself->progname);
if (!iscygwin ())
close_all_files ();
}
else
{
myself->set_has_pgid_children ();
ProtectHandle (pi.hThread);
pinfo child (cygpid,
PID_IN_USE | (real_path.iscygexec () ? 0 : PID_NOTCYGWIN));
if (!child)
{
syscall_printf ("pinfo failed");
if (get_errno () != ENOMEM)
set_errno (EAGAIN);
res = -1;
goto out;
}
child->dwProcessId = pi.dwProcessId;
child.hProcess = pi.hProcess;
real_path.get_wide_win32_path (child->progname);
/* FIXME: This introduces an unreferenced, open handle into the child.
The purpose is to keep the pid shared memory open so that all of
the fields filled out by child.remember do not disappear and so there
is not a brief period during which the pid is not available.
However, we should try to find another way to do this eventually. */
DuplicateHandle (GetCurrentProcess (), child.shared_handle (),
pi.hProcess, NULL, 0, 0, DUPLICATE_SAME_ACCESS);
child->start_time = time (NULL); /* Register child's starting time. */
child->nice = myself->nice;
postfork (child);
if (!child.remember (mode == _P_DETACH))
{
/* FIXME: Child in strange state now */
CloseHandle (pi.hProcess);
ForceCloseHandle (pi.hThread);
res = -1;
goto out;
}
}
/* Start the child running */
if (c_flags & CREATE_SUSPENDED)
{
/* Inject a non-inheritable wr_proc_pipe handle into child so that we
can accurately track when the child exits without keeping this
process waiting around for it to exit. */
if (!iscygwin ())
DuplicateHandle (GetCurrentProcess (), wr_proc_pipe, pi.hProcess, NULL,
0, false, DUPLICATE_SAME_ACCESS);
ResumeThread (pi.hThread);
if (iscygwin ())
strace.write_childpid (pi.dwProcessId);
}
ForceCloseHandle (pi.hThread);
sigproc_printf ("spawned windows pid %d", pi.dwProcessId);
bool synced;
if ((mode == _P_DETACH || mode == _P_NOWAIT) && !iscygwin ())
synced = false;
else
/* Just mark a non-cygwin process as 'synced'. We will still eventually
wait for it to exit in maybe_set_exit_code_from_windows(). */
synced = iscygwin () ? sync (pi.dwProcessId, pi.hProcess, INFINITE) : true;
switch (mode)
{
case _P_OVERLAY:
myself.hProcess = pi.hProcess;
if (!synced)
{
if (!proc_retry (pi.hProcess))
{
looped++;
goto loop;
}
close_all_files (true);
}
else
{
if (iscygwin ())
close_all_files (true);
if (!my_wr_proc_pipe
&& WaitForSingleObject (pi.hProcess, 0) == WAIT_TIMEOUT)
wait_for_myself ();
}
myself.exit (EXITCODE_NOSET);
break;
case _P_WAIT:
case _P_SYSTEM:
system_call.arm ();
if (waitpid (cygpid, &res, 0) != cygpid)
res = -1;
break;
case _P_DETACH:
res = 0; /* Lost all memory of this child. */
break;
case _P_NOWAIT:
case _P_NOWAITO:
case _P_VFORK:
res = cygpid;
break;
default:
break;
}
out:
this->cleanup ();
if (envblock)
free (envblock);
return (int) res;
}
extern "C" int
cwait (int *result, int pid, int)
{
return waitpid (pid, result, 0);
}
/*
* Helper function for spawn runtime calls.
* Doesn't search the path.
*/
extern "C" int
spawnve (int mode, const char *path, const char *const *argv,
const char *const *envp)
{
static char *const empty_env[] = { NULL };
int ret;
#ifdef NEWVFORK
vfork_save *vf = vfork_storage.val ();
if (vf != NULL && (vf->pid < 0) && mode == _P_OVERLAY)
mode = _P_NOWAIT;
else
vf = NULL;
#endif
syscall_printf ("spawnve (%s, %s, %p)", path, argv[0], envp);
if (!envp)
envp = empty_env;
switch (_P_MODE (mode))
{
case _P_OVERLAY:
ch_spawn.worker (path, argv, envp, mode);
/* Errno should be set by worker. */
ret = -1;
break;
case _P_VFORK:
case _P_NOWAIT:
case _P_NOWAITO:
case _P_WAIT:
case _P_DETACH:
case _P_SYSTEM:
ret = ch_spawn.worker (path, argv, envp, mode);
#ifdef NEWVFORK
if (vf)
{
if (ret > 0)
{
debug_printf ("longjmping due to vfork");
vf->restore_pid (ret);
}
}
#endif
break;
default:
set_errno (EINVAL);
ret = -1;
break;
}
return ret;
}
/*
* spawn functions as implemented in the MS runtime library.
* Most of these based on (and copied from) newlib/libc/posix/execXX.c
*/
extern "C" int
spawnl (int mode, const char *path, const char *arg0, ...)
{
int i;
va_list args;
const char *argv[256];
va_start (args, arg0);
argv[0] = arg0;
i = 1;
do
argv[i] = va_arg (args, const char *);
while (argv[i++] != NULL);
va_end (args);
return spawnve (mode, path, (char * const *) argv, cur_environ ());
}
extern "C" int
spawnle (int mode, const char *path, const char *arg0, ...)
{
int i;
va_list args;
const char * const *envp;
const char *argv[256];
va_start (args, arg0);
argv[0] = arg0;
i = 1;
do
argv[i] = va_arg (args, const char *);
while (argv[i++] != NULL);
envp = va_arg (args, const char * const *);
va_end (args);
return spawnve (mode, path, (char * const *) argv, (char * const *) envp);
}
extern "C" int
spawnlp (int mode, const char *file, const char *arg0, ...)
{
int i;
va_list args;
const char *argv[256];
path_conv buf;
va_start (args, arg0);
argv[0] = arg0;
i = 1;
do
argv[i] = va_arg (args, const char *);
while (argv[i++] != NULL);
va_end (args);
return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf),
(char * const *) argv, cur_environ ());
}
extern "C" int
spawnlpe (int mode, const char *file, const char *arg0, ...)
{
int i;
va_list args;
const char * const *envp;
const char *argv[256];
path_conv buf;
va_start (args, arg0);
argv[0] = arg0;
i = 1;
do
argv[i] = va_arg (args, const char *);
while (argv[i++] != NULL);
envp = va_arg (args, const char * const *);
va_end (args);
return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf),
(char * const *) argv, envp);
}
extern "C" int
spawnv (int mode, const char *path, const char * const *argv)
{
return spawnve (mode, path, argv, cur_environ ());
}
extern "C" int
spawnvp (int mode, const char *file, const char * const *argv)
{
path_conv buf;
return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf), argv,
cur_environ ());
}
extern "C" int
spawnvpe (int mode, const char *file, const char * const *argv,
const char * const *envp)
{
path_conv buf;
return spawnve (mode | _P_PATH_TYPE_EXEC, find_exec (file, buf), argv, envp);
}
int
av::setup (const char *prog_arg, path_conv& real_path, const char *ext,
int argc, const char *const *argv, bool p_type_exec)
{
const char *p;
bool exeext = ascii_strcasematch (ext, ".exe");
new (this) av (argc, argv);
if ((exeext && real_path.iscygexec ()) || ascii_strcasematch (ext, ".bat")
|| (!*ext && ((p = ext - 4) > real_path.get_win32 ())
&& (ascii_strcasematch (p, ".bat") || ascii_strcasematch (p, ".cmd")
|| ascii_strcasematch (p, ".btm"))))
/* no extra checks needed */;
else
while (1)
{
char *pgm = NULL;
char *arg1 = NULL;
char *ptr, *buf;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
HANDLE h;
NTSTATUS status;
LARGE_INTEGER size;
status = NtOpenFile (&h, SYNCHRONIZE | GENERIC_READ,
real_path.get_object_attr (attr, sec_none_nih),
&io, FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT
| FILE_NON_DIRECTORY_FILE);
if (!NT_SUCCESS (status))
{
/* File is not readable? Doesn't mean it's not executable.
Test for executability and if so, just assume the file is
a cygwin executable and go ahead. */
if (status == STATUS_ACCESS_DENIED && real_path.has_acls ()
&& check_file_access (real_path, X_OK, true) == 0)
{
real_path.set_cygexec (true);
break;
}
goto err;
}
if (!GetFileSizeEx (h, &size))
{
NtClose (h);
goto err;
}
if (size.QuadPart > (LONGLONG) wincap.allocation_granularity ())
size.LowPart = wincap.allocation_granularity ();
HANDLE hm = CreateFileMapping (h, &sec_none_nih, PAGE_READONLY,
0, 0, NULL);
NtClose (h);
if (!hm)
{
/* ERROR_FILE_INVALID indicates very likely an empty file. */
if (GetLastError () == ERROR_FILE_INVALID)
{
debug_printf ("zero length file, treat as script.");
goto just_shell;
}
goto err;
}
/* Try to map the first 64K of the image. That's enough for the local
tests, and it's enough for hook_or_detect_cygwin to compute the IAT
address. */
buf = (char *) MapViewOfFile (hm, FILE_MAP_READ, 0, 0, size.LowPart);
if (!buf)
{
CloseHandle (hm);
goto err;
}
{
myfault efault;
if (efault.faulted ())
{
UnmapViewOfFile (buf);
CloseHandle (hm);
real_path.set_cygexec (false);
break;
}
if (buf[0] == 'M' && buf[1] == 'Z')
{
WORD subsys;
unsigned off = (unsigned char) buf[0x18] | (((unsigned char) buf[0x19]) << 8);
win16_exe = off < sizeof (IMAGE_DOS_HEADER);
if (!win16_exe)
real_path.set_cygexec (hook_or_detect_cygwin (buf, NULL,
subsys, hm));
else
real_path.set_cygexec (false);
UnmapViewOfFile (buf);
CloseHandle (hm);
break;
}
}
CloseHandle (hm);
debug_printf ("%s is possibly a script", real_path.get_win32 ());
ptr = buf;
if (*ptr++ == '#' && *ptr++ == '!')
{
ptr += strspn (ptr, " \t");
size_t len = strcspn (ptr, "\r\n");
while (ptr[len - 1] == ' ' || ptr[len - 1] == '\t')
len--;
if (len)
{
char *namebuf = (char *) alloca (len + 1);
memcpy (namebuf, ptr, len);
namebuf[len] = '\0';
for (ptr = pgm = namebuf; *ptr; ptr++)
if (!arg1 && (*ptr == ' ' || *ptr == '\t'))
{
/* Null terminate the initial command and step over any
additional white space. If we've hit the end of the
line, exit the loop. Otherwise, we've found the first
argument. Position the current pointer on the last known
white space. */
*ptr = '\0';
char *newptr = ptr + 1;
newptr += strspn (newptr, " \t");
if (!*newptr)
break;
arg1 = newptr;
ptr = newptr - 1;
}
}
}
UnmapViewOfFile (buf);
just_shell:
if (!pgm)
{
if (!p_type_exec)
{
/* Not called from exec[lv]p. Don't try to treat as script. */
debug_printf ("%s is not a valid executable",
real_path.get_win32 ());
set_errno (ENOEXEC);
return -1;
}
if (ascii_strcasematch (ext, ".com"))
break;
pgm = (char *) "/bin/sh";
arg1 = NULL;
}
/* Check if script is executable. Otherwise we start non-executable
scripts successfully, which is incorrect behaviour. */
if (real_path.has_acls ()
&& check_file_access (real_path, X_OK, true) < 0)
return -1; /* errno is already set. */
/* Replace argv[0] with the full path to the script if this is the
first time through the loop. */
replace0_maybe (prog_arg);
/* pointers:
* pgm interpreter name
* arg1 optional string
*/
if (arg1)
unshift (arg1);
/* FIXME: This should not be using FE_NATIVE. It should be putting
the posix path on the argv list. */
find_exec (pgm, real_path, "PATH=", FE_NATIVE, &ext);
unshift (real_path.get_win32 (), 1);
}
if (real_path.iscygexec ())
dup_all ();
return 0;
err:
__seterrno ();
return -1;
}
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