diff options
Diffstat (limited to 'winsup/cygwin/spawn.cc')
| -rw-r--r-- | winsup/cygwin/spawn.cc | 1110 |
1 files changed, 0 insertions, 1110 deletions
diff --git a/winsup/cygwin/spawn.cc b/winsup/cygwin/spawn.cc deleted file mode 100644 index c5b5bee9a..000000000 --- a/winsup/cygwin/spawn.cc +++ /dev/null @@ -1,1110 +0,0 @@ -/* spawn.cc - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, - 2005, 2006, 2007, 2008, 2009 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 <wingdi.h> -#include <winuser.h> -#include <wchar.h> -#include <ctype.h> -#include "cygerrno.h" -#include <sys/cygwin.h> -#include "security.h" -#include "path.h" -#include "fhandler.h" -#include "dtable.h" -#include "sigproc.h" -#include "cygheap.h" -#include "child_info.h" -#include "pinfo.h" -#include "environ.h" -#include "cygtls.h" -#include "tls_pbuf.h" -#include "winf.h" -#include "ntdll.h" - -static suffix_info exe_suffixes[] = -{ - suffix_info ("", 1), - suffix_info (".exe", 1), - suffix_info (".com"), - suffix_info (NULL) -}; - -static suffix_info dll_suffixes[] = -{ - suffix_info (".dll"), - suffix_info ("", 1), - suffix_info (".exe", 1), - suffix_info (NULL) -}; - -child_info_spawn *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. - - 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) ? dll_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 * __stdcall -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 = strchr (name, '/'); - int err; - - /* 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); - - if ((suffix = perhaps_suffix (tmp, buf, err, opt)) != NULL) - { - if (buf.has_acls () && check_file_access (buf, X_OK)) - 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 spawn_guts. */ - -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])); -} - -struct pthread_cleanup -{ - _sig_func_ptr oldint; - _sig_func_ptr oldquit; - sigset_t oldmask; - pthread_cleanup (): oldint (NULL), oldquit (NULL), oldmask ((sigset_t) -1) {} -}; - -static void -do_cleanup (void *args) -{ -# define cleanup ((pthread_cleanup *) args) - if (cleanup->oldmask != (sigset_t) -1) - { - signal (SIGINT, cleanup->oldint); - signal (SIGQUIT, cleanup->oldquit); - sigprocmask (SIG_SETMASK, &(cleanup->oldmask), NULL); - } -# undef cleanup -} - - -int -spawn_guts (const char *prog_arg, const char *const *argv, - const char *const envp[], int mode, int __stdin, int __stdout) -{ - bool rc; - pid_t cygpid; - int res = -1; - - if (prog_arg == NULL) - { - syscall_printf ("prog_arg is NULL"); - set_errno (EINVAL); - return -1; - } - - syscall_printf ("spawn_guts (%d, %.9500s)", mode, prog_arg); - - if (argv == NULL) - { - syscall_printf ("argv is NULL"); - set_errno (EINVAL); - return -1; - } - - /* FIXME: There is a small race here and FIXME: not thread safe! */ - - pthread_cleanup cleanup; - if (mode == _P_SYSTEM) - { - sigset_t child_block; - cleanup.oldint = signal (SIGINT, SIG_IGN); - cleanup.oldquit = signal (SIGQUIT, SIG_IGN); - sigemptyset (&child_block); - sigaddset (&child_block, SIGCHLD); - sigprocmask (SIG_BLOCK, &child_block, &cleanup.oldmask); - } - 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; - - tmp_pathbuf tp; - PWCHAR runpath = tp.w_get (); - int c_flags; - bool wascygexec; - cygheap_exec_info *moreinfo; - - bool null_app_name = false; - STARTUPINFOW si = {}; - int looped = 0; - HANDLE orig_wr_proc_pipe = NULL; - - myfault efault; - 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 = PROC_SPAWN; - else - chtype = PROC_EXEC; - - moreinfo = (cygheap_exec_info *) ccalloc_abort (HEAP_1_EXEC, 1, - sizeof (cygheap_exec_info)); - moreinfo->old_title = NULL; - - /* 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 */; - - newargv.set (ac, argv); - - int err; - const char *ext; - if ((ext = perhaps_suffix (prog_arg, real_path, err, FE_NADA)) == NULL) - { - set_errno (err); - res = -1; - goto out; - } - - - wascygexec = real_path.iscygexec (); - res = newargv.fixup (prog_arg, real_path, ext); - - if (res) - goto out; - - if (!real_path.iscygexec () - && (cygheap->cwd.drive_length == 0 - || cygheap->cwd.win32.Length >= MAX_PATH * sizeof (WCHAR))) - { - small_printf ("Error: Current working directory is a %s.\n" - "Can't start native Windows application from here.\n\n", - cygheap->cwd.drive_length == 0 - ? "virtual Cygwin directory" - : "path longer than allowed for a\n" - "Win32 working directory"); - set_errno (ENAMETOOLONG); - res = -1; - goto out; - } - - if (ac == 3 && argv[1][0] == '/' && argv[1][1] == 'c' && - (iscmd (argv[0], "command.com") || iscmd (argv[0], "cmd.exe"))) - { - real_path.check (prog_arg); - one_line.add ("\""); - if (!real_path.error) - one_line.add (real_path.get_win32 ()); - else - one_line.add (argv[0]); - one_line.add ("\""); - one_line.add (" "); - one_line.add (argv[1]); - one_line.add (" "); - one_line.add (argv[2]); - real_path.set_path (argv[0]); - null_app_name = true; - } - else - { - if (wascygexec) - newargv.dup_all (); - else if (!one_line.fromargv (newargv, real_path.get_win32 (), - real_path.iscygexec ())) - { - res = -1; - goto out; - } - - - newargv.all_calloced (); - moreinfo->argc = newargv.argc; - moreinfo->argv = newargv; - - if (mode != _P_OVERLAY || - !DuplicateHandle (hMainProc, myself.shared_handle (), hMainProc, - &moreinfo->myself_pinfo, 0, TRUE, - DUPLICATE_SAME_ACCESS)) - moreinfo->myself_pinfo = NULL; - else - VerifyHandle (moreinfo->myself_pinfo); - } - WCHAR wone_line[one_line.ix + 1]; - if (one_line.ix) - sys_mbstowcs (wone_line, one_line.ix + 1, one_line.buf); - else - wone_line[0] = L'\0'; - - 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 ((__stdin < 0 ? 0 : __stdin), false); - si.hStdOutput = handle ((__stdout < 0 ? 1 : __stdout), true); - si.hStdError = handle (2, true); - - si.cb = sizeof (si); - - c_flags = GetPriorityClass (hMainProc); - sigproc_printf ("priority class %d", c_flags); - c_flags |= CREATE_SEPARATE_WOW_VDM | CREATE_UNICODE_ENVIRONMENT; - - 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; - } - /* 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) - /* already done previously */; - else if (DuplicateHandle (hMainProc, hMainProc, hMainProc, - &cygheap->pid_handle, PROCESS_QUERY_INFORMATION, - TRUE, 0)) - ProtectHandleINH (cygheap->pid_handle); - else - system_printf ("duplicate to pid_handle failed, %E"); - } - - runpath = null_app_name ? NULL : 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 native Win32 - child processes happy which are not long path aware. */ - USHORT len = real_path.get_nt_native_path ()->Length; - if (len < (MAX_PATH + 4) * sizeof (WCHAR) - || (runpath[5] != L':' /* UNC path */ - && len < (MAX_PATH + 6) * sizeof (WCHAR))) - { - PWCHAR r = runpath + 4; - if (r[1] != L':') /* UNC path */ - *(r += 2) = L'\\'; - if (!RtlIsDosDeviceName_U (r)) - runpath = r; - else if (*r == L'\\') - *r = L'C'; - } - } - - syscall_printf ("null_app_name %d (%W, %.9500W)", null_app_name, - runpath, wone_line); - - cygbench ("spawn-guts"); - - 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; - } - ch.set (chtype, real_path.iscygexec ()); - ch.moreinfo = moreinfo; - ch.__stdin = __stdin; - ch.__stdout = __stdout; - - si.lpReserved2 = (LPBYTE) &ch; - si.cbReserved2 = sizeof (ch); - - /* Depends on ch.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)) - c_flags |= CREATE_SUSPENDED; - - /* 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 (); - - if (!cygheap->user.issetuid () - || (cygheap->user.saved_uid == cygheap->user.real_uid - && cygheap->user.saved_gid == cygheap->user.real_gid - && !cygheap->user.groups.issetgroups ())) - { - rc = CreateProcessW (runpath, /* image name - with full path */ - wone_line, /* 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 (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 */ - wone_line, /* 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); - } - } - - /* 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 (); - - /* 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; - } - res = -1; - goto out; - } - - if (!(c_flags & CREATE_SUSPENDED)) - strace.write_childpid (ch, 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 ("%d = spawn_guts (%s, %.9500s)", - rc ? cygpid : (unsigned int) -1, prog_arg, one_line.buf); - - /* Name the handle similarly to proc_subproc. */ - ProtectHandle1 (pi.hProcess, childhProc); - - bool synced; - 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; - strcpy (myself->progname, real_path.get_win32 ()); // FIXME: race? - sigproc_printf ("new process name %s", myself->progname); - /* If wr_proc_pipe doesn't exist then this process was not started by a cygwin - process. So, we need to wait around until the process we've just "execed" - dies. Use our own wait facility to wait for our own pid to exit (there - is some minor special case code in proc_waiter and friends to accommodate - this). - - If wr_proc_pipe exists, then it should be duplicated to the child. - If the child has exited already, that's ok. The parent will pick up - on this fact when we exit. dup_proc_pipe will close our end of the pipe. - Note that wr_proc_pipe may also be == INVALID_HANDLE_VALUE. That will make - dup_proc_pipe essentially a no-op. */ - if (!newargv.win16_exe && myself->wr_proc_pipe) - { - if (!looped) - myself->sync_proc_pipe (); /* Make sure that we own wr_proc_pipe - just in case we've been previously - execed. */ - orig_wr_proc_pipe = myself->dup_proc_pipe (pi.hProcess); - } - pid = myself->pid; - if (!ch.iscygwin ()) - close_all_files (); - } - else - { - myself->set_has_pgid_children (); - ProtectHandle (pi.hThread); - pinfo child (cygpid, PID_IN_USE); - 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; - - strcpy (child->progname, real_path.get_win32 ()); - /* 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 (hMainProc, 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; - if (!child.remember (mode == _P_DETACH)) - { - /* FIXME: Child in strange state now */ - CloseHandle (pi.hProcess); - ForceCloseHandle (pi.hThread); - res = -1; - goto out; - } - pid = child->pid; - } - - /* Start the child running */ - if (c_flags & CREATE_SUSPENDED) - { - ResumeThread (pi.hThread); - strace.write_childpid (ch, pi.dwProcessId); - } - ForceCloseHandle (pi.hThread); - - sigproc_printf ("spawned windows pid %d", pi.dwProcessId); - - if ((mode == _P_DETACH || mode == _P_NOWAIT) && !ch.iscygwin ()) - synced = false; - else - synced = ch.sync (pi.dwProcessId, pi.hProcess, INFINITE); - - switch (mode) - { - case _P_OVERLAY: - myself.hProcess = pi.hProcess; - if (!synced) - { - if (orig_wr_proc_pipe) - { - myself->wr_proc_pipe_owner = GetCurrentProcessId (); - myself->wr_proc_pipe = orig_wr_proc_pipe; - } - if (!ch.proc_retry (pi.hProcess)) - { - looped++; - goto loop; - } - close_all_files (true); - } - else - { - close_all_files (true); - if (!myself->wr_proc_pipe - && WaitForSingleObject (pi.hProcess, 0) == WAIT_TIMEOUT) - { - extern bool is_toplevel_proc; - is_toplevel_proc = true; - myself.remember (false); - waitpid (myself->pid, &res, 0); - } - } - myself.exit (EXITCODE_NOSET); - break; - case _P_WAIT: - case _P_SYSTEM: - 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: - if (envblock) - free (envblock); - pthread_cleanup_pop (1); - return (int) res; -#undef ch -} - -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) -{ - 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, %x)", path, argv[0], envp); - - switch (mode) - { - case _P_OVERLAY: - /* We do not pass _P_SEARCH_PATH here. execve doesn't search PATH.*/ - /* Just act as an exec if _P_OVERLAY set. */ - spawn_guts (path, argv, envp, mode); - /* Errno should be set by spawn_guts. */ - ret = -1; - break; - case _P_VFORK: - case _P_NOWAIT: - case _P_NOWAITO: - case _P_WAIT: - case _P_DETACH: - case _P_SYSTEM: - ret = spawn_guts (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 *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 spawnvpe (mode, path, (char * const *) argv, cur_environ ()); -} - -extern "C" int -spawnlpe (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 spawnvpe (mode, path, (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 *path, const char * const *argv) -{ - return spawnvpe (mode, path, 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, find_exec (file, buf), argv, envp); -} - -int -av::fixup (const char *prog_arg, path_conv& real_path, const char *ext) -{ - const char *p; - bool exeext = ascii_strcasematch (ext, ".exe"); - if ((exeext && real_path.iscygexec ()) || ascii_strcasematch (ext, ".bat")) - return 0; - if (!*ext && ((p = ext - 4) > real_path.get_win32 ()) - && (ascii_strcasematch (p, ".bat") || ascii_strcasematch (p, ".cmd") - || ascii_strcasematch (p, ".btm"))) - return 0; - while (1) - { - char *pgm = NULL; - char *arg1 = NULL; - char *ptr, *buf; - OBJECT_ATTRIBUTES attr; - IO_STATUS_BLOCK io; - HANDLE h; - NTSTATUS status; - - status = NtOpenFile (&h, SYNCHRONIZE | GENERIC_READ, - real_path.get_object_attr (attr, sec_none_nih), - &io, FILE_SHARE_READ | FILE_SHARE_WRITE, - FILE_SYNCHRONOUS_IO_NONALERT - | FILE_OPEN_FOR_BACKUP_INTENT - | FILE_NON_DIRECTORY_FILE); - if (!NT_SUCCESS (status)) - goto err; - - 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; - } - buf = (char *) MapViewOfFile(hm, FILE_MAP_READ, 0, 0, 0); - CloseHandle (hm); - if (!buf) - goto err; - - { - myfault efault; - if (efault.faulted ()) - { - UnmapViewOfFile (buf); - 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)); - else - real_path.set_cygexec (false); - UnmapViewOfFile (buf); - break; - } - } - - 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"); - 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 (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) < 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); - } - return 0; - -err: - __seterrno (); - return -1; -} |