JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Throughout use "have_execed" macro rather than "hExeced" global handle.

Browse Source 
Throughout rename _PROC_* to _CH_*.
* child_info.h: Include "pinfo.h".
(child_info_types): Rename _PROC_* -> _CH_* to avoid confusion with similarly
named constants.
(_PROC_*): Delete unneeded aliases.
(PROC_*): Ditto.
(CURR_CHILD_INFO_MAGIC): Ditto.
(cchildren): Define using "pinfo_minimal".
(child_info::set_saw_ctrl_c): Move to
(child_info_spawn::set_saw_ctrl_c): Here.
(child_info_spawn::lock): New field.
(child_info_spawn::hExeced): Ditto.
(child_info_spawn::ev): Ditto.
(child_info_spawn::~child_info_spawn): Move to sigproc.cc.
(child_info_spawn::child_info_spawn): Ditto.
(child_info_spawn::cleanup): Declare new function.
(child_info_spawn::set_saw_ctrl_c): Move to this class.  Set flag only when
execed and return true when we have set the flag.
(child_info_spawn::child_info_spawn::signal_myself_exited): New function.
(child_info_spawn::wait_for_myself): Ditto.
(child_info_spawn::has_execed_cygwin): Ditto.
(child_info_spawn::has_execed): Ditto.  Replaces "hExeced" test.
(child_info_spawn::operator HANDLE&): New operator.
(child_info_spawn::worker): Define old "spawn_guts" as class member.
(ch_spawn): Declare.
(have_execed): Define.
(have_execed_cygwin): Ditto.
* cygheap.h: Update comment.
* dcrt0.cc (get_cygwin_startup_info): Use _CH_* enums.
(child_info_spawn::handle_spawn): Ditto.
(dll_crt0_0): Ditto.
(multiple_cygwin_problem): Ditto.
* exceptions.cc (chExeced): Delete obsolete declaration.
(ctrl_c_handler): Reference set_saw_ctrl_c via new ch_spawn global.
* globals.cc (hExeced): Delete.
* pinfo.cc (pinfo::thisproc): Refer to cygheap as ::cygheap for consistency in
handle naming when -DDEBUGGING.
(pinfo::init): Accommodate case where myself.h is known but h0 is passed in.
(pinfo::pinfo): New constructor for setting up a pinfo passed in by previous
exec'or.
(pinfo::proc_waiter): Don't handle subprocess if we're in the process of
exiting due to an exec of a cygwin process.  Don't close rd_proc_pipe here.
Close it when we actually are finished with the process.  Use new
ch_spawn.signal_myself_exited function to let exec stub know that subprocess
has exited.
(pinfo::wait): Clarify debugging output.
(pinfo::release): Use "close_h" to close all handles to avoid races.
(winpids::add): Assume that elements of the array do not need to be zeroed and
are properly initialized or suffer problems on pinfo::release.  Don't close
hProcess since release does that now.
* pinfo.h: Update comment.
(pinfo_minimal): Move some elements from pinfo here so that child_info_spawn
can use them.
(pinfo): Inherit from pinfo_minimal.
(pinfo::pinfo): Modify to accommodate new pinfo_minimal.
(pinfo::allow_remove): New function.
* sigproc.cc (proc_subproc): Use boolean values for true/false.  Implement
PROC_EXEC_CLEANUP.
(proc_terminate): Set ppid = 1 since the procs list will only be iterated when
the process has not execed.  Don't do any cleanup here since it is now handled
in pinfo::release.
(sigproc_init): Initialize sync_proc_subproc earlier.
(child_info::child_info): Assume that all important fields are properly
initialized and avoid memset().
(child_info_spawn::child_info_spawn): Specifically test for execing and then
set up appropriate fields in the struct.
(child_info_spawn::cleanup): Define new function.
(child_info_spawn::record_children): Specifically test for being execed here.
Fill in pinfo_minimal part of children array.
(child_info_spawn::reattach_children): Use constructor to duplicate information
for previous exec'or.  Add more debugging output.
(remove_proc): Force deletion of thread when exiting due to exec.  Rely on
pinfo::cleanup in release.
* sigproc.h (PROC_EXEC_CLEANUP): New enum.
(PROC_DETACHED_CHILD): Delete.
* spawn.cc (chExeced): Delete.
(child_info_spawn::worker): Rename from spawn_guts.  Use elements of
child_info_spawn throughout rather than ch.whatever.  Use ::cygheap to refer to
global rather than element of child_info.  Use wait_for_myself() rather than
waitpid().  Call child_info_spawn::cleanup on function return.
(spawnve): Reflect movement of spawn_guts functionality into
child_info_spawn::worker.
* syscalls.cc (popen): Ditto.
* winsup.h (spawn_guts): Delete declaration.
This commit is contained in:
Christopher Faylor
2011-11-14 01:29:49 +00:00
parent 46e7439b9d
commit 56a1971526
27 changed files with 458 additions and 242 deletions
Download Patch File Download Diff File Expand all files Collapse all files

115
winsup/cygwin/spawn.cc
View File

@@ -56,8 +56,6 @@ static suffix_info dll_suffixes[] =
};
#endif
child_info_spawn NO_COPY *chExeced;
/* 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.
@@ -219,7 +217,7 @@ find_exec (const char *name, path_conv& buf, const char *mywinenv,
return retval;
}
/* Utility for spawn_guts. */
/* Utility for child_info_spawn::worker. */
static HANDLE
handle (int fd, bool writing)
@@ -271,10 +269,12 @@ do_cleanup (void *args)
# undef cleanup
}
NO_COPY child_info_spawn ch_spawn;
int
spawn_guts (const char *prog_arg, const char *const *argv,
const char *const envp[], int mode, int __stdin, int __stdout)
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;
@@ -298,7 +298,7 @@ spawn_guts (const char *prog_arg, const char *const *argv,
return -1;
}
syscall_printf ("spawn_guts (%d, %.9500s)", mode, prog_arg);
syscall_printf ("mode = %d, prog_arg = %.9500s", mode, prog_arg);
/* FIXME: This is no error condition on Linux. */
if (argv == NULL)
@@ -323,7 +323,6 @@ spawn_guts (const char *prog_arg, const char *const *argv,
pthread_cleanup_push (do_cleanup, (void *) &cleanup);
av newargv;
linebuf one_line;
child_info_spawn ch;
PWCHAR envblock = NULL;
path_conv real_path;
bool reset_sendsig = false;
@@ -332,7 +331,6 @@ spawn_guts (const char *prog_arg, const char *const *argv,
PWCHAR runpath = tp.w_get ();
int c_flags;
bool wascygexec;
cygheap_exec_info *moreinfo;
bool null_app_name = false;
STARTUPINFOW si = {};
@@ -352,9 +350,9 @@ spawn_guts (const char *prog_arg, const char *const *argv,
child_info_types chtype;
if (mode != _P_OVERLAY)
chtype = PROC_SPAWN;
chtype = _CH_SPAWN;
else
chtype = PROC_EXEC;
chtype = _CH_EXEC;
moreinfo = (cygheap_exec_info *) ccalloc_abort (HEAP_1_EXEC, 1,
sizeof (cygheap_exec_info));
@@ -384,12 +382,12 @@ spawn_guts (const char *prog_arg, const char *const *argv,
if (res)
goto out;
if (!real_path.iscygexec () && cygheap->cwd.get_error ())
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 ());
::cygheap->cwd.get_error_desc ());
set_errno (::cygheap->cwd.get_error ());
res = -1;
goto out;
}
@@ -447,8 +445,8 @@ spawn_guts (const char *prog_arg, const char *const *argv,
/* Set up needed handles for stdio */
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = handle ((__stdin < 0 ? 0 : __stdin), false);
si.hStdOutput = handle ((__stdout < 0 ? 1 : __stdout), true);
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);
@@ -479,12 +477,12 @@ spawn_guts (const char *prog_arg, const char *const *argv,
/* Save a copy of a handle to the current process around the first time we
exec so that the pid will not be reused. Why did I stop cygwin from
generating its own pids again? */
if (cygheap->pid_handle)
if (::cygheap->pid_handle)
/* already done previously */;
else if (DuplicateHandle (GetCurrentProcess (), GetCurrentProcess (),
GetCurrentProcess (), &cygheap->pid_handle,
GetCurrentProcess (), &::cygheap->pid_handle,
PROCESS_QUERY_INFORMATION, TRUE, 0))
ProtectHandleINH (cygheap->pid_handle);
ProtectHandleINH (::cygheap->pid_handle);
else
system_printf ("duplicate to pid_handle failed, %E");
}
@@ -529,10 +527,10 @@ spawn_guts (const char *prog_arg, const char *const *argv,
syscall_printf ("null_app_name %d (%W, %.9500W)", null_app_name,
runpath, wone_line);
cygbench ("spawn-guts");
cygbench ("spawn-worker");
if (!real_path.iscygexec())
cygheap->fdtab.set_file_pointers_for_exec ();
::cygheap->fdtab.set_file_pointers_for_exec ();
moreinfo->envp = build_env (envp, envblock, moreinfo->envc,
real_path.iscygexec ());
@@ -542,23 +540,21 @@ spawn_guts (const char *prog_arg, const char *const *argv,
res = -1;
goto out;
}
ch.set (chtype, real_path.iscygexec ());
ch.moreinfo = moreinfo;
ch.__stdin = __stdin;
ch.__stdout = __stdout;
if (mode == _P_OVERLAY && ch.iscygwin ())
ch.record_children ();
set (chtype, real_path.iscygexec ());
__stdin = in__stdin;
__stdout = in__stdout;
record_children ();
si.lpReserved2 = (LPBYTE) &ch;
si.cbReserved2 = sizeof (ch);
si.lpReserved2 = (LPBYTE) this;
si.cbReserved2 = sizeof (*this);
/* Depends on ch.set call above.
/* 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
&& (!ch.iscygwin () || mode != _P_OVERLAY
|| cygheap->fdtab.need_fixup_before ()))
&& (!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
@@ -568,26 +564,26 @@ spawn_guts (const char *prog_arg, const char *const *argv,
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 (!ch.iscygwin () && myself->ctty >= 0 && iscons_dev (myself->ctty)
if (!iscygwin () && myself->ctty >= 0 && iscons_dev (myself->ctty)
&& fhandler_console::tc_getpgid () != getpgrp ())
c_flags |= CREATE_NEW_PROCESS_GROUP;
ch.refresh_cygheap ();
refresh_cygheap ();
/* 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. */
loop:
cygheap->user.deimpersonate ();
::cygheap->user.deimpersonate ();
if (!real_path.iscygexec () && mode == _P_OVERLAY)
myself->process_state |= PID_NOTCYGWIN;
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))
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 */
wone_line, /* what was passed to exec */
@@ -621,20 +617,20 @@ loop:
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
if (!::cygheap->user.setuid_to_restricted
&& wcscasecmp (wstname, L"WinSta0") != 0)
{
WCHAR sid[128];
sa = sec_user ((PSECURITY_ATTRIBUTES) alloca (1024),
cygheap->user.sid ());
::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,
hwst = CreateWindowStationW (::cygheap->user.get_windows_id (sid), 0,
GENERIC_READ | GENERIC_WRITE, sa);
if (!hwst)
system_printf ("CreateWindowStation failed, %E");
@@ -651,7 +647,7 @@ loop:
}
}
rc = CreateProcessAsUserW (cygheap->user.primary_token (),
rc = CreateProcessAsUserW (::cygheap->user.primary_token (),
runpath, /* image name - with full path */
wone_line, /* what was passed to exec */
&sec_none_nih, /* process security attrs */
@@ -677,7 +673,7 @@ loop:
/* Restore impersonation. In case of _P_OVERLAY this isn't
allowed since it would overwrite child data. */
if (mode != _P_OVERLAY || !rc)
cygheap->user.reimpersonate ();
::cygheap->user.reimpersonate ();
/* Set errno now so that debugging messages from it appear before our
final debugging message [this is a general rule for debugging
@@ -698,12 +694,12 @@ loop:
}
if (!(c_flags & CREATE_SUSPENDED))
strace.write_childpid (ch, pi.dwProcessId);
strace.write_childpid (*this, 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 (::cygheap->fdtab.need_fixup_before ())
::cygheap->fdtab.fixup_before_exec (pi.dwProcessId);
if (mode != _P_OVERLAY)
cygpid = cygwin_pid (pi.dwProcessId);
@@ -711,7 +707,7 @@ loop:
cygpid = myself->pid;
/* We print the original program name here so the user can see that too. */
syscall_printf ("%d = spawn_guts (%s, %.9500s)",
syscall_printf ("%d = child_info_spawn::worker (%s, %.9500s)",
rc ? cygpid : (unsigned int) -1, prog_arg, one_line.buf);
/* Name the handle similarly to proc_subproc. */
@@ -721,7 +717,6 @@ loop:
pid_t pid;
if (mode == _P_OVERLAY)
{
chExeced = &ch; /* FIXME: there's a race here if a user sneaks in CTRL-C */
myself->dwProcessId = pi.dwProcessId;
strace.execing = 1;
myself.hProcess = hExeced = pi.hProcess;
@@ -747,7 +742,7 @@ loop:
orig_wr_proc_pipe = myself->dup_proc_pipe (pi.hProcess);
}
pid = myself->pid;
if (!ch.iscygwin ())
if (!iscygwin ())
close_all_files ();
}
else
@@ -792,16 +787,16 @@ loop:
if (c_flags & CREATE_SUSPENDED)
{
ResumeThread (pi.hThread);
strace.write_childpid (ch, pi.dwProcessId);
strace.write_childpid (*this, pi.dwProcessId);
}
ForceCloseHandle (pi.hThread);
sigproc_printf ("spawned windows pid %d", pi.dwProcessId);
if ((mode == _P_DETACH || mode == _P_NOWAIT) && !ch.iscygwin ())
if ((mode == _P_DETACH || mode == _P_NOWAIT) && !iscygwin ())
synced = false;
else
synced = ch.sync (pi.dwProcessId, pi.hProcess, INFINITE);
synced = sync (pi.dwProcessId, pi.hProcess, INFINITE);
switch (mode)
{
@@ -814,7 +809,7 @@ loop:
myself->wr_proc_pipe_owner = GetCurrentProcessId ();
myself->wr_proc_pipe = orig_wr_proc_pipe;
}
if (!ch.proc_retry (pi.hProcess))
if (!proc_retry (pi.hProcess))
{
looped++;
goto loop;
@@ -830,9 +825,10 @@ loop:
extern bool is_toplevel_proc;
is_toplevel_proc = true;
myself.remember (false);
waitpid (myself->pid, &res, 0);
wait_for_myself ();
}
}
this->cleanup ();
myself.exit (EXITCODE_NOSET);
break;
case _P_WAIT:
@@ -853,11 +849,12 @@ loop:
}
out:
debug_printf ("about to call cleanup");
this->cleanup ();
if (envblock)
free (envblock);
pthread_cleanup_pop (1);
return (int) res;
#undef ch
}
extern "C" int
@@ -895,8 +892,8 @@ spawnve (int mode, const char *path, const char *const *argv,
switch (_P_MODE (mode))
{
case _P_OVERLAY:
spawn_guts (path, argv, envp, mode);
/* Errno should be set by spawn_guts. */
ch_spawn.worker (path, argv, envp, mode);
/* Errno should be set by worker. */
ret = -1;
break;
case _P_VFORK:
@@ -905,7 +902,7 @@ spawnve (int mode, const char *path, const char *const *argv,
case _P_WAIT:
case _P_DETACH:
case _P_SYSTEM:
ret = spawn_guts (path, argv, envp, mode);
ret = ch_spawn.worker (path, argv, envp, mode);
#ifdef NEWVFORK
if (vf)
{