/* spawn.cc Copyright 1996, 1997, 1998, 1999, 2000 Cygnus Solutions. 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 #include #include #include #include #include #include #include #include #include #include "cygerrno.h" #include #include "fhandler.h" #include "path.h" #include "dtable.h" #include "sync.h" #include "sigproc.h" #include "cygheap.h" #include "child_info.h" #include "pinfo.h" #define NEED_VFORK #include "perthread.h" #include "registry.h" #include "environ.h" #include "security.h" #define LINE_BUF_CHUNK (MAX_PATH * 2) suffix_info std_suffixes[] = { suffix_info (".exe", 1), suffix_info ("", 1), suffix_info (".com"), suffix_info (".cmd"), suffix_info (".bat"), suffix_info (".dll"), 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) { char *ext; debug_printf ("prog '%s'", prog); buf.check (prog, PC_SYM_FOLLOW | PC_FULL, std_suffixes); if (buf.file_attributes () & FILE_ATTRIBUTE_DIRECTORY) ext = NULL; else if (buf.known_suffix) ext = buf + (buf.known_suffix - buf.get_win32 ()); else ext = strchr (buf, '\0'); debug_printf ("buf %s, suffix found '%s'", (char *) buf, 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, int null_if_notfound, const char **known_suffix) { const char *suffix = ""; debug_printf ("find_exec (%s)", name); char *retval = buf; /* 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 ((suffix = perhaps_suffix (name, buf)) != NULL) goto out; win_env *winpath; const char *path; char tmp[MAX_PATH]; /* Return the error condition if this is an absolute path or if there is no PATH to search. */ if (strchr (name, '/') || strchr (name, '\\') || isdrive (name) || !(winpath = getwinenv (mywinenv)) || !(path = winpath->get_native ()) || *path == '\0') goto errout; debug_printf ("%s%s", mywinenv, path); /* Iterate over the specified path, looking for the file with and without executable extensions. */ do { char *eotmp = strccpy (tmp, &path, ';'); /* An empty path or '.' means the current directory, but we've already tried that. */ if (tmp[0] == '\0' || (tmp[0] == '.' && tmp[1] == '\0')) continue; *eotmp++ = '\\'; strcpy (eotmp, name); debug_printf ("trying %s", tmp); if ((suffix = perhaps_suffix (tmp, buf)) != NULL) goto out; } while (*path && *++path); errout: /* Couldn't find anything in the given path. Take the appropriate action based on null_if_not_found. */ if (null_if_notfound) retval = NULL; else buf.check (name); out: debug_printf ("%s = find_exec (%s)", (char *) buf, name); if (known_suffix) *known_suffix = suffix ?: strchr (buf, '\0'); return retval; } /* Utility for spawn_guts. */ static HANDLE handle (int n, int direction) { fhandler_base *fh = fdtab[n]; if (!fh) return INVALID_HANDLE_VALUE; if (fh->get_close_on_exec ()) return INVALID_HANDLE_VALUE; if (direction == 0) return fh->get_handle (); return fh->get_output_handle (); } 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])); } class linebuf { public: size_t ix; char *buf; size_t alloced; linebuf () : ix (0), buf (NULL), alloced (0) { } ~linebuf () {/* if (buf) free (buf);*/} void add (const char *what, int len); void add (const char *what) {add (what, strlen (what));} void prepend (const char *what, int len); }; void linebuf::add (const char *what, int len) { size_t newix; if ((newix = ix + len) >= alloced || !buf) { alloced += LINE_BUF_CHUNK + newix; buf = (char *) realloc (buf, alloced + 1); } memcpy (buf + ix, what, len); ix = newix; buf[ix] = '\0'; } void linebuf::prepend (const char *what, int len) { int buflen; size_t newix; if ((newix = ix + len) >= alloced) { alloced += LINE_BUF_CHUNK + newix; buf = (char *) realloc (buf, alloced + 1); buf[ix] = '\0'; } if ((buflen = strlen (buf))) memmove (buf + len, buf, buflen + 1); else buf[newix] = '\0'; memcpy (buf, what, len); ix = newix; } class av { char **argv; int calloced; public: int argc; av (int ac, const char * const *av) : calloced (0), argc (ac) { argv = (char **) cmalloc (HEAP_1_ARGV, (argc + 5) * sizeof (char *)); memcpy (argv, av, (argc + 1) * sizeof (char *)); } ~av () { for (int i = 0; i < calloced; i++) cfree (argv[i]); cfree (argv); } int unshift (const char *what, int conv = 0); operator char **() {return argv;} void all_calloced () {calloced = argc;} void replace0_maybe (const char *arg0) { /* Note: Assumes that argv array has not yet been "unshifted" */ if (!calloced) { argv[0] = cstrdup1 (arg0); calloced = 1; } } void dup_maybe (int i) { if (i >= calloced) argv[i] = cstrdup1 (argv[i]); } void dup_all () { for (int i = calloced; i < argc; i++) argv[i] = cstrdup1 (argv[i]); } }; int av::unshift (const char *what, int conv) { char **av; av = (char **) crealloc (argv, (argc + 2) * sizeof (char *)); if (!av) return 0; argv = av; memmove (argv + 1, argv, (argc + 1) * sizeof (char *)); char buf[MAX_PATH + 1]; if (conv) { cygwin_conv_to_posix_path (what, buf); char *p = strchr (buf, '\0') - 4; if (p > buf && strcasematch (p, ".exe")) *p = '\0'; what = buf; } *argv = cstrdup1 (what); argc++; calloced++; return 1; } static int __stdcall spawn_guts (HANDLE hToken, const char * prog_arg, const char *const *argv, const char *const envp[], int mode) { BOOL rc; pid_t cygpid; MALLOC_CHECK; if (prog_arg == NULL) { syscall_printf ("prog_arg is NULL"); set_errno(EINVAL); return -1; } syscall_printf ("spawn_guts (%.132s)", prog_arg); if (argv == NULL) { syscall_printf ("argv is NULL"); set_errno(EINVAL); return (-1); } path_conv real_path; linebuf one_line; STARTUPINFO si = {0, NULL, NULL, NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL}; child_info_spawn ciresrv; si.lpReserved2 = (LPBYTE) &ciresrv; si.cbReserved2 = sizeof (ciresrv); DWORD chtype; if (mode != _P_OVERLAY && mode != _P_VFORK) chtype = PROC_SPAWN; else chtype = PROC_EXEC; HANDLE spr = CreateEvent(&sec_all, TRUE, FALSE, NULL); ProtectHandle (spr); init_child_info (chtype, &ciresrv, (mode == _P_OVERLAY) ? myself->pid : 1, spr); if (!DuplicateHandle (hMainProc, hMainProc, hMainProc, &ciresrv.parent, 0, 1, DUPLICATE_SAME_ACCESS)) { system_printf ("couldn't create handle to myself for child, %E"); return -1; } ciresrv.moreinfo = (cygheap_exec_info *) ccalloc (HEAP_1_EXEC, 1, sizeof (cygheap_exec_info)); ciresrv.moreinfo->old_title = NULL; ciresrv.moreinfo->fds = fdtab; ciresrv.moreinfo->nfds = fdtab.size; /* 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 */; av newargv (ac, argv); if (ac == 3 && argv[1][0] == '/' && argv[1][1] == 'c' && (iscmd (argv[0], "command.com") || iscmd (argv[0], "cmd.exe"))) { one_line.add (argv[0]); one_line.add (" "); one_line.add (argv[1]); one_line.add (" "); one_line.add (argv[2]); strcpy (real_path, argv[0]); goto skip_arg_parsing; } const char *ext; if ((ext = perhaps_suffix (prog_arg, real_path)) == NULL) { set_errno (ENOENT); return -1; } MALLOC_CHECK; /* If the file name ends in either .exe, .com, .bat, or .cmd we assume that it is NOT a script file */ while (*ext == '\0') { HANDLE hnd = CreateFileA (real_path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, &sec_none_nih, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); if (hnd == INVALID_HANDLE_VALUE) { __seterrno (); return -1; } DWORD done; char buf[2 * MAX_PATH + 1]; buf[0] = buf[1] = buf[2] = buf[sizeof(buf) - 1] = '\0'; if (!ReadFile (hnd, buf, sizeof (buf) - 1, &done, 0)) { CloseHandle (hnd); __seterrno (); return -1; } CloseHandle (hnd); if (buf[0] == 'M' && buf[1] == 'Z') break; debug_printf ("%s is a script", (char *) real_path); char *pgm, *arg1; if (buf[0] != '#' || buf[1] != '!') { pgm = (char *) "/bin/sh"; arg1 = NULL; } else { char *ptr; pgm = buf + 2; pgm += strspn (pgm, " \t"); for (ptr = pgm, arg1 = NULL; *ptr && *ptr != '\r' && *ptr != '\n'; 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 || *newptr == '\r' || *newptr == '\n') break; arg1 = newptr; ptr = newptr - 1; } *ptr = '\0'; } /* Replace argv[0] with the full path to the script if this is the first time through the loop. */ newargv.replace0_maybe (prog_arg); /* pointers: * pgm interpreter name * arg1 optional string */ if (arg1) newargv.unshift (arg1); find_exec (pgm, real_path, "PATH=", 0, &ext); newargv.unshift (real_path, 1); } if (real_path.iscygexec ()) newargv.dup_all (); else { for (int i = 0; i < newargv.argc; i++) { char *p = NULL; const char *a; newargv.dup_maybe (i); a = i ? newargv[i] : (char *) real_path; int len = strlen (a); if (len != 0 && !strpbrk (a, " \t\n\r\"")) one_line.add (a, len); else { one_line.add ("\"", 1); for (; (p = strpbrk (a, "\"\\")); a = ++p) { one_line.add (a, p - a); if ((*p == '\\' && p[1] == '"') || *p == '"') one_line.add ("\\", 1); one_line.add (p, 1); } if (*a) one_line.add (a); one_line.add ("\"", 1); } MALLOC_CHECK; one_line.add (" ", 1); MALLOC_CHECK; } MALLOC_CHECK; if (one_line.ix) one_line.buf[one_line.ix - 1] = '\0'; else one_line.add ("", 1); MALLOC_CHECK; } newargv.all_calloced (); ciresrv.moreinfo->argc = newargv.argc; ciresrv.moreinfo->argv = newargv; cygcwd.copy (ciresrv.moreinfo->cwd_posix, ciresrv.moreinfo->cwd_win32, ciresrv.moreinfo->cwd_hash); ciresrv.moreinfo->envc = envsize (envp, 0); ciresrv.moreinfo->envp = (char **) cmalloc (HEAP_1_ARGV, ciresrv.moreinfo->envc); ciresrv.hexec_proc = hexec_proc; char **c; const char * const *e; for (c = ciresrv.moreinfo->envp, e = envp; *e;) *c++ = cstrdup1 (*e++); *c = NULL; if (mode != _P_OVERLAY || !DuplicateHandle (hMainProc, myself.shared_handle (), hMainProc, &ciresrv.moreinfo->myself_pinfo, 0, TRUE, DUPLICATE_SAME_ACCESS)) ciresrv.moreinfo->myself_pinfo = NULL; skip_arg_parsing: PROCESS_INFORMATION pi = {NULL, 0, 0, 0}; si.lpReserved = NULL; si.lpDesktop = NULL; si.dwFlags = STARTF_USESTDHANDLES; si.hStdInput = handle (0, 0); /* Get input handle */ si.hStdOutput = handle (1, 1); /* Get output handle */ si.hStdError = handle (2, 1); /* Get output handle */ si.cb = sizeof (si); syscall_printf ("spawn_guts (%s, %.132s)", (char *) real_path, one_line.buf); int flags = CREATE_DEFAULT_ERROR_MODE | GetPriorityClass (hMainProc); if (mode == _P_DETACH || !set_console_state_for_spawn ()) flags |= DETACHED_PROCESS; if (mode != _P_OVERLAY) flags |= CREATE_SUSPENDED; /* Build windows style environment list */ char *envblock; if (real_path.iscygexec ()) envblock = NULL; else envblock = winenv (envp, 0); ciresrv.cygheap = cygheap; ciresrv.cygheap_max = cygheap_max; /* Preallocated buffer for `sec_user' call */ char sa_buf[1024]; if (!hToken && myself->token != INVALID_HANDLE_VALUE) hToken = myself->token; cygbench ("spawn-guts"); if (!hToken) { ciresrv.moreinfo->uid = getuid (); rc = CreateProcess (real_path, /* image name - with full path */ one_line.buf, /* what was passed to exec */ /* process security attrs */ allow_ntsec ? sec_user (sa_buf) : &sec_all_nih, /* thread security attrs */ allow_ntsec ? sec_user (sa_buf) : &sec_all_nih, TRUE, /* inherit handles from parent */ flags, envblock,/* environment */ 0, /* use current drive/directory */ &si, &pi); } else { /* allow the child to interact with our window station/desktop */ HANDLE hwst, hdsk; SECURITY_INFORMATION dsi = DACL_SECURITY_INFORMATION; DWORD n; char wstname[1024]; char dskname[1024]; ciresrv.moreinfo->uid = USHRT_MAX; hwst = GetProcessWindowStation(); SetUserObjectSecurity(hwst, &dsi, get_null_sd ()); GetUserObjectInformation(hwst, UOI_NAME, wstname, 1024, &n); hdsk = GetThreadDesktop(GetCurrentThreadId()); SetUserObjectSecurity(hdsk, &dsi, get_null_sd ()); GetUserObjectInformation(hdsk, UOI_NAME, dskname, 1024, &n); strcat (wstname, "\\"); strcat (wstname, dskname); si.lpDesktop = wstname; char tu[1024]; PSID sid = NULL; DWORD ret_len; if (GetTokenInformation (hToken, TokenUser, (LPVOID) &tu, sizeof tu, &ret_len)) sid = ((TOKEN_USER *) &tu)->User.Sid; else system_printf ("GetTokenInformation: %E"); /* Retrieve security attributes before setting psid to NULL since it's value is needed by `sec_user'. */ PSECURITY_ATTRIBUTES sec_attribs = allow_ntsec && sid ? sec_user (sa_buf, sid) : &sec_all_nih; /* Remove impersonation */ uid_t uid = geteuid(); if (myself->impersonated && myself->token != INVALID_HANDLE_VALUE) seteuid (myself->orig_uid); /* Load users registry hive. */ load_registry_hive (sid); rc = CreateProcessAsUser (hToken, real_path, /* image name - with full path */ one_line.buf, /* what was passed to exec */ sec_attribs, /* process security attrs */ sec_attribs, /* thread security attrs */ TRUE, /* inherit handles from parent */ flags, envblock,/* environment */ 0, /* use current drive/directory */ &si, &pi); /* Restore impersonation. In case of _P_OVERLAY this isn't allowed since it would overwrite child data. */ if (mode != _P_OVERLAY && mode != _P_VFORK && myself->impersonated && myself->token != INVALID_HANDLE_VALUE) seteuid (uid); } MALLOC_CHECK; if (envblock) free (envblock); MALLOC_CHECK; /* 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) { if (spr) ForceCloseHandle (spr); __seterrno (); syscall_printf ("CreateProcess failed, %E"); return -1; } if (mode == _P_OVERLAY) cygpid = myself->pid; else cygpid = cygwin_pid (pi.dwProcessId); /* We print the original program name here so the user can see that too. */ syscall_printf ("%d = spawn_guts (%s, %.132s)", rc ? cygpid : (unsigned int) -1, prog_arg, one_line.buf); /* Name the handle similarly to proc_subproc. */ ProtectHandle1 (pi.hProcess, childhProc); if (mode == _P_OVERLAY) { /* These are both duplicated in the child code. We do this here, primarily for strace. */ strcpy (myself->progname, real_path); myself->dwProcessId = pi.dwProcessId; } else { ProtectHandle (pi.hThread); pinfo child (cygpid, 1); if (!child) { set_errno (EAGAIN); syscall_printf ("-1 = spawnve (), process table full"); return -1; } child->username[0] = '\0'; child->progname[0] = '\0'; child->ppid = myself->pid; child->gid = myself->gid; child->pgid = myself->pgid; child->sid = myself->sid; child->ctty = myself->ctty; child->umask = myself->umask; child->process_state |= PID_INITIALIZING; if (myself->use_psid) { child->use_psid = 1; memcpy (child->psid, myself->psid, MAX_SID_LEN); } memcpy (child->logsrv, myself->logsrv, MAX_HOST_NAME); memcpy (child->domain, myself->domain, MAX_COMPUTERNAME_LENGTH+1); memcpy (child->root, myself->root, MAX_PATH+1); child->rootlen = myself->rootlen; child->dwProcessId = pi.dwProcessId; child->hProcess = pi.hProcess; child.remember (); /* Start the child running */ ResumeThread (pi.hThread); } ForceCloseHandle (pi.hThread); sigproc_printf ("spawned windows pid %d", pi.dwProcessId); if (hToken && hToken != myself->token) CloseHandle (hToken); DWORD res; BOOL exited; HANDLE waitbuf[3] = {pi.hProcess, signal_arrived, spr}; int nwait = 3; res = 0; exited = FALSE; MALLOC_CHECK; for (int i = 0; i < 100; i++) { switch (WaitForMultipleObjects (nwait, waitbuf, FALSE, INFINITE)) { case WAIT_OBJECT_0: sigproc_printf ("subprocess exited"); DWORD exitcode; if (!GetExitCodeProcess (pi.hProcess, &exitcode)) exitcode = 1; res |= exitcode; exited = TRUE; if (nwait > 2 && !(res & EXIT_REPARENTING) && (mode == _P_OVERLAY || mode == _P_VFORK)) res |= EXIT_REPARENTING; break; case WAIT_OBJECT_0 + 1: sigproc_printf ("signal arrived"); ResetEvent (signal_arrived); continue; case WAIT_OBJECT_0 + 2: if (mode == _P_OVERLAY) { res |= EXIT_REPARENTING; if (!parent_alive) { nwait = 1; sigproc_terminate (); continue; } } break; case WAIT_FAILED: system_printf ("wait failed: nwait %d, pid %d, winpid %d, %E", nwait, myself->pid, myself->dwProcessId); system_printf ("waitbuf[0] %p %d", waitbuf[0], WaitForSingleObject (waitbuf[0], 0)); system_printf ("waitbuf[1] %p = %d", waitbuf[1], WaitForSingleObject (waitbuf[1], 0)); system_printf ("waitbuf[w] %p = %d", waitbuf[2], WaitForSingleObject (waitbuf[2], 0)); set_errno (ECHILD); try_to_debug (); return -1; } break; } ForceCloseHandle (spr); sigproc_printf ("res = %x", res); if (mode == _P_OVERLAY && (res & EXIT_REPARENTING)) { /* Try to reparent child process. * Make handles to child available to parent process and exit with * EXIT_REPARENTING status. Wait() syscall in parent will then wait * for newly created child. */ pinfo parent (myself->ppid); if (!parent) /* nothing */; else { int rc = 0; HANDLE oldh = myself->hProcess; HANDLE h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, parent->dwProcessId); sigproc_printf ("parent handle %p, pid %d", h, parent->dwProcessId); if (h == NULL && GetLastError () == ERROR_INVALID_PARAMETER) rc = 1; else if (h) { ProtectHandle (h); rc = DuplicateHandle (hMainProc, pi.hProcess, h, &myself->hProcess, 0, FALSE, DUPLICATE_SAME_ACCESS); sigproc_printf ("%d = DuplicateHandle, oldh %p, newh %p", rc, oldh, myself->hProcess); ForceCloseHandle (h); } if (!rc) { system_printf ("Reparent failed, parent handle %p, %E", h); system_printf ("my dwProcessId %d, myself->dwProcessId %d", GetCurrentProcessId(), myself->dwProcessId); system_printf ("old hProcess %p, hProcess %p", oldh, myself->hProcess); } } } MALLOC_CHECK; switch (mode) { case _P_OVERLAY: ForceCloseHandle1 (pi.hProcess, childhProc); proc_terminate (); myself->exit (0, 1); break; case _P_WAIT: waitpid (cygpid, (int *) &res, 0); break; case _P_DETACH: res = 0; /* Lose all memory of this child. */ break; case _P_NOWAIT: case _P_NOWAITO: case _P_VFORK: res = cygpid; break; default: break; } 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 (HANDLE hToken, int mode, const char *path, const char *const *argv, const char *const *envp) { int ret; vfork_save *vf = vfork_storage.val (); if (vf != NULL && (vf->pid < 0) && mode == _P_OVERLAY) mode = _P_NOWAIT; else vf = NULL; 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 (hToken, 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: subproc_init (); ret = spawn_guts (hToken, path, argv, envp, mode); if (vf && ret > 0) { vf->pid = ret; longjmp (vf->j, 1); } 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 (NULL, 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 (NULL, 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 (NULL, mode, path, argv, cur_environ ()); } extern "C" int spawnve (int mode, const char *path, char * const *argv, const char * const *envp) { return _spawnve (NULL, mode, path, argv, envp); } 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 (NULL, mode, find_exec (file, buf), argv, envp); }