/* syscalls.cc: syscalls Copyright 1996, 1997, 1998, 1999, 2000, 2001 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 #include /* needed for statfs */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* for UNLEN */ #include #include #include "cygerrno.h" #include "perprocess.h" #include "security.h" #include "fhandler.h" #include "path.h" #include "dtable.h" #include "sync.h" #include "sigproc.h" #include "pinfo.h" #include #include "shared_info.h" #include "cygheap.h" extern int normalize_posix_path (const char *, char *); SYSTEM_INFO system_info; /* Close all files and process any queued deletions. Lots of unix style applications will open a tmp file, unlink it, but never call close. This function is called by _exit to ensure we don't leave any such files lying around. */ void __stdcall close_all_files (void) { SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "close_all_files"); fhandler_base *fh; for (int i = 0; i < (int) cygheap->fdtab.size; i++) if ((fh = cygheap->fdtab[i]) != NULL) { fh->close (); cygheap->fdtab.release (i); } ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "close_all_files"); cygwin_shared->delqueue.process_queue (); } BOOL __stdcall check_pty_fds (void) { int res = FALSE; SetResourceLock (LOCK_FD_LIST, WRITE_LOCK, "check_pty_fds"); fhandler_base *fh; for (int i = 0; i < (int) cygheap->fdtab.size; i++) if ((fh = cygheap->fdtab[i]) != NULL && (fh->get_device () == FH_TTYS || fh->get_device () == FH_PTYM)) { res = TRUE; break; } ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK, "check_pty_fds"); return res; } int dup (int fd) { int res; cygheap_fdnew newfd; if (newfd < 0) res = -1; else res = dup2 (fd, newfd); return res; } int dup2 (int oldfd, int newfd) { return cygheap->fdtab.dup2 (oldfd, newfd); } extern "C" int _unlink (const char *ourname) { int res = -1; sigframe thisframe (mainthread); path_conv win32_name (ourname, PC_SYM_NOFOLLOW | PC_FULL); if (win32_name.error) { set_errno (win32_name.error); goto done; } syscall_printf ("_unlink (%s)", win32_name.get_win32 ()); if (!win32_name.exists ()) { syscall_printf ("unlinking a nonexistent file"); set_errno (ENOENT); goto done; } else if (win32_name.isdir ()) { syscall_printf ("unlinking a directory"); set_errno (EPERM); goto done; } /* Windows won't check the directory mode, so we do that ourselves. */ if (!writable_directory (win32_name)) { syscall_printf ("non-writable directory"); goto done; } /* Check for shortcut as symlink condition. */ if (win32_name.has_attribute (FILE_ATTRIBUTE_READONLY)) { int len = strlen (win32_name); if (len > 4 && strcasematch ((char *) win32_name + len - 4, ".lnk")) SetFileAttributes (win32_name, (DWORD) win32_name & ~FILE_ATTRIBUTE_READONLY); } DWORD lasterr; lasterr = 0; for (int i = 0; i < 2; i++) { if (DeleteFile (win32_name)) { syscall_printf ("DeleteFile succeeded"); goto ok; } lasterr = GetLastError (); if (i || lasterr != ERROR_ACCESS_DENIED || win32_name.issymlink ()) break; /* Couldn't delete it. */ /* if access denied, chmod to be writable, in case it is not, and try again */ (void) chmod (win32_name, 0777); } /* Windows 9x seems to report ERROR_ACCESS_DENIED rather than sharing violation. So, set lasterr to ERROR_SHARING_VIOLATION in this case to simplify tests. */ if (wincap.access_denied_on_delete () && lasterr == ERROR_ACCESS_DENIED && !win32_name.isremote ()) lasterr = ERROR_SHARING_VIOLATION; /* Tried to delete file by normal DeleteFile and by resetting protection and then deleting. That didn't work. There are two possible reasons for this: 1) The file may be opened and Windows is not allowing it to be deleted, or 2) We may not have permissions to delete the file. So, first assume that it may be 1) and try to remove the file using the Windows FILE_FLAG_DELETE_ON_CLOSE semantics. This seems to work only spottily on Windows 9x/Me but it does seem to work reliably on NT as long as the file doesn't exist on a remote drive. */ bool delete_on_close_ok; delete_on_close_ok = !win32_name.isremote () && wincap.has_delete_on_close (); /* Attempt to use "delete on close" semantics to handle removing a file which may be open. */ HANDLE h; h = CreateFile (win32_name, GENERIC_READ, FILE_SHARE_READ, &sec_none_nih, OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, 0); if (h == INVALID_HANDLE_VALUE) { if (GetLastError () == ERROR_FILE_NOT_FOUND) goto ok; } else { CloseHandle (h); syscall_printf ("CreateFile/CloseHandle succeeded"); /* Everything is fine if the file has disappeared or if we know that the FILE_FLAG_DELETE_ON_CLOSE will eventually work. */ if (GetFileAttributes (win32_name) == (DWORD) -1 || delete_on_close_ok) goto ok; /* The file is either gone already or will eventually be deleted by the OS. */ } /* FILE_FLAGS_DELETE_ON_CLOSE was a bust. If this is a sharing violation, then queue the file for deletion when the process exits. Otherwise, punt. */ if (lasterr != ERROR_SHARING_VIOLATION) goto err; syscall_printf ("couldn't delete file, err %d", lasterr); /* Add file to the "to be deleted" queue. */ cygwin_shared->delqueue.queue_file (win32_name); /* Success condition. */ ok: res = 0; goto done; /* Error condition. */ err: __seterrno (); res = -1; done: syscall_printf ("%d = unlink (%s)", res, ourname); return res; } extern "C" int remove (const char *ourname) { path_conv win32_name (ourname, PC_SYM_NOFOLLOW | PC_FULL); if (win32_name.error) { set_errno (win32_name.error); syscall_printf ("-1 = remove (%s)", ourname); return -1; } return win32_name.isdir () ? rmdir (ourname) : _unlink (ourname); } extern "C" pid_t _getpid () { return myself->pid; } /* getppid: POSIX 4.1.1.1 */ extern "C" pid_t getppid () { return myself->ppid; } /* setsid: POSIX 4.3.2.1 */ extern "C" pid_t setsid (void) { if (myself->pgid != _getpid ()) { if (myself->ctty == TTY_CONSOLE && !cygheap->fdtab.has_console_fds () && !check_pty_fds ()) FreeConsole (); myself->ctty = -1; myself->sid = _getpid (); myself->pgid = _getpid (); syscall_printf ("sid %d, pgid %d, ctty %d", myself->sid, myself->pgid, myself->ctty); return myself->sid; } set_errno (EPERM); return -1; } extern "C" ssize_t _read (int fd, void *ptr, size_t len) { if (len == 0) return 0; if (__check_null_invalid_struct_errno (ptr, len)) return -1; int res; extern int sigcatchers; int e = get_errno (); while (1) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) return -1; DWORD wait = cfd->is_nonblocking () ? 0 : INFINITE; /* Could block, so let user know we at least got here. */ syscall_printf ("read (%d, %p, %d) %sblocking, sigcatchers %d", fd, ptr, len, wait ? "" : "non", sigcatchers); if (wait && (!cfd->is_slow () || cfd->get_r_no_interrupt ())) debug_printf ("non-interruptible read\n"); else if (!cfd->ready_for_read (fd, wait)) { res = -1; goto out; } /* FIXME: This is not thread safe. We need some method to ensure that an fd, closed in another thread, aborts I/O operations. */ if (!cfd.isopen()) return -1; /* Check to see if this is a background read from a "tty", sending a SIGTTIN, if appropriate */ res = cfd->bg_check (SIGTTIN); if (!cfd.isopen()) return -1; if (res > bg_eof) { myself->process_state |= PID_TTYIN; if (!cfd.isopen()) return -1; res = cfd->read (ptr, len); myself->process_state &= ~PID_TTYIN; } out: if (res >= 0 || get_errno () != EINTR || !thisframe.call_signal_handler ()) break; set_errno (e); } syscall_printf ("%d = read (%d, %p, %d), errno %d", res, fd, ptr, len, get_errno ()); MALLOC_CHECK; return res; } extern "C" ssize_t _write (int fd, const void *ptr, size_t len) { int res = -1; sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) goto done; /* No further action required for len == 0 */ if (len == 0) { res = 0; goto done; } if (len && __check_invalid_read_ptr_errno (ptr, len)) goto done; /* Could block, so let user know we at least got here. */ if (fd == 1 || fd == 2) paranoid_printf ("write (%d, %p, %d)", fd, ptr, len); else syscall_printf ("write (%d, %p, %d)", fd, ptr, len); res = cfd->bg_check (SIGTTOU); if (res > bg_eof) { myself->process_state |= PID_TTYOU; res = cfd->write (ptr, len); myself->process_state &= ~PID_TTYOU; } done: if (fd == 1 || fd == 2) paranoid_printf ("%d = write (%d, %p, %d)", res, fd, ptr, len); else syscall_printf ("%d = write (%d, %p, %d)", res, fd, ptr, len); return (ssize_t) res; } /* * FIXME - should really move this interface into fhandler, and implement * write in terms of it. There are devices in Win32 that could do this with * overlapped I/O much more efficiently - we should eventually use * these. */ extern "C" ssize_t writev (int fd, const struct iovec *iov, int iovcnt) { int i; ssize_t len, total; char *base; if (iovcnt < 1 || iovcnt > IOV_MAX) { set_errno (EINVAL); return -1; } /* Ensure that the sum of the iov_len values is less than SSIZE_MAX (per spec), if so, we must fail with no output (per spec). */ total = 0; for (i = 0; i < iovcnt; ++i) { total += iov[i].iov_len; if (total > SSIZE_MAX) { set_errno (EINVAL); return -1; } } /* Now write the data */ for (i = 0, total = 0; i < iovcnt; i++, iov++) { len = iov->iov_len; base = iov->iov_base; while (len > 0) { register int nbytes; nbytes = write (fd, base, len); if (nbytes < 0 && total == 0) return -1; if (nbytes <= 0) return total; len -= nbytes; total += nbytes; base += nbytes; } } return total; } /* * FIXME - should really move this interface into fhandler, and implement * read in terms of it. There are devices in Win32 that could do this with * overlapped I/O much more efficiently - we should eventually use * these. */ extern "C" ssize_t readv (int fd, const struct iovec *iov, int iovcnt) { int i; ssize_t len, total; char *base; for (i = 0, total = 0; i < iovcnt; i++, iov++) { len = iov->iov_len; base = iov->iov_base; while (len > 0) { register int nbytes; nbytes = read (fd, base, len); if (nbytes < 0 && total == 0) return -1; if (nbytes <= 0) return total; len -= nbytes; total += nbytes; base += nbytes; } } return total; } /* _open */ /* newlib's fcntl.h defines _open as taking variable args so we must correspond. The third arg if it exists is: mode_t mode. */ extern "C" int _open (const char *unix_path, int flags, ...) { int res = -1; va_list ap; mode_t mode = 0; sigframe thisframe (mainthread); syscall_printf ("open (%s, %p)", unix_path, flags); if (!check_null_empty_str_errno (unix_path)) { /* check for optional mode argument */ va_start (ap, flags); mode = va_arg (ap, mode_t); va_end (ap); fhandler_base *fh; cygheap_fdnew fd; if (fd >= 0) { path_conv pc; if (!(fh = cygheap->fdtab.build_fhandler_from_name (fd, unix_path, NULL, pc))) res = -1; // errno already set else if (!fh->open (&pc, flags, (mode & 07777) & ~cygheap->umask)) { fd.release (); res = -1; } else if ((res = fd) <= 2) set_std_handle (res); } } syscall_printf ("%d = open (%s, %p)", res, unix_path, flags); return res; } extern "C" off_t _lseek (int fd, off_t pos, int dir) { off_t res; sigframe thisframe (mainthread); if (dir != SEEK_SET && dir != SEEK_CUR && dir != SEEK_END) { set_errno (EINVAL); res = -1; } else { cygheap_fdget cfd (fd); if (cfd >= 0) res = cfd->lseek (pos, dir); else res = -1; } syscall_printf ("%d = lseek (%d, %d, %d)", res, fd, pos, dir); return res; } extern "C" int _close (int fd) { int res; sigframe thisframe (mainthread); syscall_printf ("close (%d)", fd); MALLOC_CHECK; cygheap_fdget cfd (fd, true); if (cfd < 0) res = -1; else { cfd->close (); cfd.release (); res = 0; } syscall_printf ("%d = close (%d)", res, fd); MALLOC_CHECK; return res; } extern "C" int isatty (int fd) { int res; sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) res = 0; else res = cfd->is_tty (); syscall_printf ("%d = isatty (%d)", res, fd); return res; } /* Under NT, try to make a hard link using backup API. If that fails or we are Win 95, just copy the file. FIXME: We should actually be checking partition type, not OS. Under NTFS, we should support hard links. On FAT partitions, we should just copy the file. */ extern "C" int _link (const char *a, const char *b) { int res = -1; sigframe thisframe (mainthread); path_conv real_a (a, PC_SYM_NOFOLLOW | PC_FULL); path_conv real_b (b, PC_SYM_NOFOLLOW | PC_FULL); if (real_a.error) { set_errno (real_a.error); goto done; } if (real_b.error) { set_errno (real_b.case_clash ? ECASECLASH : real_b.error); goto done; } if (real_b.exists ()) { syscall_printf ("file '%s' exists?", (char *)real_b); set_errno (EEXIST); goto done; } if (real_b.get_win32 ()[strlen (real_b.get_win32 ()) - 1] == '.') { syscall_printf ("trailing dot, bailing out"); set_errno (EINVAL); goto done; } /* Try to make hard link first on Windows NT */ if (wincap.has_hard_links ()) { if (CreateHardLinkA (real_b.get_win32 (), real_a.get_win32 (), NULL)) { res = 0; goto done; } HANDLE hFileSource; WIN32_STREAM_ID StreamId; DWORD dwBytesWritten; LPVOID lpContext; DWORD cbPathLen; DWORD StreamSize; WCHAR wbuf[MAX_PATH]; BOOL bSuccess; hFileSource = CreateFile ( real_a.get_win32 (), FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE /*| FILE_SHARE_DELETE*/, &sec_none_nih, // sa OPEN_EXISTING, 0, NULL ); if (hFileSource == INVALID_HANDLE_VALUE) { syscall_printf ("cannot open source, %E"); goto docopy; } lpContext = NULL; cbPathLen = sys_mbstowcs (wbuf, real_b.get_win32 (), MAX_PATH) * sizeof (WCHAR); StreamId.dwStreamId = BACKUP_LINK; StreamId.dwStreamAttributes = 0; StreamId.dwStreamNameSize = 0; StreamId.Size.HighPart = 0; StreamId.Size.LowPart = cbPathLen; StreamSize = sizeof (WIN32_STREAM_ID) - sizeof (WCHAR**) + StreamId.dwStreamNameSize; /* Write the WIN32_STREAM_ID */ bSuccess = BackupWrite ( hFileSource, (LPBYTE) &StreamId, // buffer to write StreamSize, // number of bytes to write &dwBytesWritten, FALSE, // don't abort yet FALSE, // don't process security &lpContext); if (bSuccess) { /* write the buffer containing the path */ /* FIXME: BackupWrite sometimes traps if linkname is invalid. Need to handle. */ bSuccess = BackupWrite ( hFileSource, (LPBYTE) wbuf, // buffer to write cbPathLen, // number of bytes to write &dwBytesWritten, FALSE, // don't abort yet FALSE, // don't process security &lpContext ); if (!bSuccess) syscall_printf ("cannot write linkname, %E"); /* Free context */ BackupWrite ( hFileSource, NULL, // buffer to write 0, // number of bytes to write &dwBytesWritten, TRUE, // abort FALSE, // don't process security &lpContext); } else syscall_printf ("cannot write streamId, %E"); CloseHandle (hFileSource); if (!bSuccess) goto docopy; res = 0; goto done; } docopy: /* do this with a copy */ if (CopyFileA (real_a.get_win32 (), real_b.get_win32 (), 1)) res = 0; else __seterrno (); done: syscall_printf ("%d = link (%s, %s)", res, a, b); return res; } /* chown: POSIX 5.6.5.1 */ /* * chown () is only implemented for Windows NT. Under other operating * systems, it is only a stub that always returns zero. */ static int chown_worker (const char *name, unsigned fmode, uid_t uid, gid_t gid) { int res; uid_t old_uid; gid_t old_gid; if (check_null_empty_str_errno (name)) return -1; if (!wincap.has_security ()) // real chown only works on NT res = 0; // return zero (and do nothing) under Windows 9x else { /* we need Win32 path names because of usage of Win32 API functions */ path_conv win32_path (PC_NONULLEMPTY, name, fmode); if (win32_path.error) { set_errno (win32_path.error); res = -1; goto done; } /* FIXME: This makes chown on a device succeed always. Someday we'll want to actually allow chown to work properly on devices. */ if (win32_path.is_device ()) { res = 0; goto done; } DWORD attrib = 0; if (win32_path.isdir ()) attrib |= S_IFDIR; res = get_file_attribute (win32_path.has_acls (), win32_path.get_win32 (), (int *) &attrib, &old_uid, &old_gid); if (!res) { if (uid == (uid_t) -1) uid = old_uid; if (gid == (gid_t) -1) gid = old_gid; if (win32_path.isdir()) attrib |= S_IFDIR; res = set_file_attribute (win32_path.has_acls (), win32_path, uid, gid, attrib, cygheap->user.logsrv ()); } if (res != 0 && (!win32_path.has_acls () || !allow_ntsec)) { /* fake - if not supported, pretend we're like win95 where it just works */ res = 0; } } done: syscall_printf ("%d = %schown (%s,...)", res, (fmode & PC_SYM_NOFOLLOW) ? "l" : "", name); return res; } extern "C" int chown (const char * name, uid_t uid, gid_t gid) { sigframe thisframe (mainthread); return chown_worker (name, PC_SYM_FOLLOW, uid, gid); } extern "C" int lchown (const char * name, uid_t uid, gid_t gid) { sigframe thisframe (mainthread); return chown_worker (name, PC_SYM_NOFOLLOW, uid, gid); } extern "C" int fchown (int fd, uid_t uid, gid_t gid) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) { syscall_printf ("-1 = fchown (%d,...)", fd); return -1; } const char *path = cfd->get_name (); if (path == NULL) { syscall_printf ("-1 = fchown (%d,...) (no name)", fd); set_errno (ENOSYS); return -1; } syscall_printf ("fchown (%d,...): calling chown_worker (%s,FOLLOW,...)", fd, path); return chown_worker (path, PC_SYM_FOLLOW, uid, gid); } /* umask: POSIX 5.3.3.1 */ extern "C" mode_t umask (mode_t mask) { mode_t oldmask; oldmask = cygheap->umask; cygheap->umask = mask & 0777; return oldmask; } /* chmod: POSIX 5.6.4.1 */ extern "C" int chmod (const char *path, mode_t mode) { int res = -1; sigframe thisframe (mainthread); path_conv win32_path (path); if (win32_path.error) { set_errno (win32_path.error); goto done; } /* FIXME: This makes chmod on a device succeed always. Someday we'll want to actually allow chmod to work properly on devices. */ if (win32_path.is_device ()) { res = 0; goto done; } if (!win32_path.exists ()) __seterrno (); else { /* temporary erase read only bit, to be able to set file security */ SetFileAttributes (win32_path, (DWORD) win32_path & ~FILE_ATTRIBUTE_READONLY); uid_t uid; gid_t gid; if (win32_path.isdir ()) mode |= S_IFDIR; get_file_attribute (win32_path.has_acls (), win32_path.get_win32 (), NULL, &uid, &gid); /* FIXME: Do we really need this to be specified twice? */ if (win32_path.isdir ()) mode |= S_IFDIR; if (!set_file_attribute (win32_path.has_acls (), win32_path, uid, gid, mode, cygheap->user.logsrv ()) && allow_ntsec) res = 0; /* if the mode we want has any write bits set, we can't be read only. */ if (mode & (S_IWUSR | S_IWGRP | S_IWOTH)) (DWORD) win32_path &= ~FILE_ATTRIBUTE_READONLY; else (DWORD) win32_path |= FILE_ATTRIBUTE_READONLY; if (S_ISLNK (mode) || S_ISSOCK (mode)) (DWORD) win32_path |= FILE_ATTRIBUTE_SYSTEM; if (!SetFileAttributes (win32_path, win32_path)) __seterrno (); else { /* Correct NTFS security attributes have higher priority */ if (res == 0 || !allow_ntsec) res = 0; } } done: syscall_printf ("%d = chmod (%s, %p)", res, path, mode); return res; } /* fchmod: P96 5.6.4.1 */ extern "C" int fchmod (int fd, mode_t mode) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) { syscall_printf ("-1 = fchmod (%d, 0%o)", fd, mode); return -1; } const char *path = cfd->get_name (); if (path == NULL) { syscall_printf ("-1 = fchmod (%d, 0%o) (no name)", fd, mode); set_errno (ENOSYS); return -1; } syscall_printf ("fchmod (%d, 0%o): calling chmod (%s, 0%o)", fd, mode, path, mode); return chmod (path, mode); } extern "C" int _fstat (int fd, struct stat *buf) { int res; sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) res = -1; else { memset (buf, 0, sizeof (struct stat)); res = cfd->fstat (buf, NULL); } syscall_printf ("%d = fstat (%d, %p)", res, fd, buf); return res; } /* fsync: P96 6.6.1.1 */ extern "C" int fsync (int fd) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) { syscall_printf ("-1 = fsync (%d)", fd); return -1; } if (FlushFileBuffers (cfd->get_handle ()) == 0) { __seterrno (); return -1; } return 0; } /* sync: standards? */ extern "C" int sync () { return 0; } suffix_info stat_suffixes[] = { suffix_info ("", 1), suffix_info (".exe", 1), suffix_info (NULL) }; /* Cygwin internal */ int __stdcall stat_worker (const char *name, struct stat *buf, int nofollow, path_conv *pc) { int res = -1; path_conv real_path; fhandler_base *fh = NULL; if (!pc) pc = &real_path; MALLOC_CHECK; if (check_null_invalid_struct_errno (buf)) goto done; fh = cygheap->fdtab.build_fhandler_from_name (-1, name, NULL, *pc, (nofollow ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW) | PC_FULL, stat_suffixes); if (pc->error) { debug_printf ("got %d error from build_fhandler_from_name", pc->error); set_errno (pc->error); } else { debug_printf ("(%s, %p, %d, %p), file_attributes %d", name, buf, nofollow, pc, (DWORD) real_path); memset (buf, 0, sizeof (struct stat)); res = fh->fstat (buf, pc); } done: if (fh) delete fh; MALLOC_CHECK; syscall_printf ("%d = (%s, %p)", res, name, buf); return res; } extern "C" int _stat (const char *name, struct stat *buf) { sigframe thisframe (mainthread); syscall_printf ("entering"); return stat_worker (name, buf, 0); } /* lstat: Provided by SVR4 and 4.3+BSD, POSIX? */ extern "C" int lstat (const char *name, struct stat *buf) { sigframe thisframe (mainthread); syscall_printf ("entering"); return stat_worker (name, buf, 1); } extern int acl_access (const char *, int); extern "C" int access (const char *fn, int flags) { sigframe thisframe (mainthread); // flags were incorrectly specified if (flags & ~(F_OK|R_OK|W_OK|X_OK)) { set_errno (EINVAL); return -1; } if (allow_ntsec) return acl_access (fn, flags); struct stat st; int r = stat_worker (fn, &st, 0); if (r) return -1; r = -1; if (flags & R_OK) { if (st.st_uid == myself->uid) { if (! (st.st_mode & S_IRUSR)) goto done; } else if (st.st_gid == myself->gid) { if (! (st.st_mode & S_IRGRP)) goto done; } else if (! (st.st_mode & S_IROTH)) goto done; } if (flags & W_OK) { if (st.st_uid == myself->uid) { if (! (st.st_mode & S_IWUSR)) goto done; } else if (st.st_gid == myself->gid) { if (! (st.st_mode & S_IWGRP)) goto done; } else if (! (st.st_mode & S_IWOTH)) goto done; } if (flags & X_OK) { if (st.st_uid == myself->uid) { if (! (st.st_mode & S_IXUSR)) goto done; } else if (st.st_gid == myself->gid) { if (! (st.st_mode & S_IXGRP)) goto done; } else if (! (st.st_mode & S_IXOTH)) goto done; } r = 0; done: if (r) set_errno (EACCES); return r; } extern "C" int _rename (const char *oldpath, const char *newpath) { sigframe thisframe (mainthread); int res = 0; char *lnk_suffix = NULL; path_conv real_old (oldpath, PC_SYM_NOFOLLOW); if (real_old.error) { syscall_printf ("-1 = rename (%s, %s)", oldpath, newpath); set_errno (real_old.error); return -1; } path_conv real_new (newpath, PC_SYM_NOFOLLOW); /* Shortcut hack. */ char new_lnk_buf[MAX_PATH + 5]; if (real_old.issymlink () && !real_new.error && !real_new.case_clash) { int len_old = strlen (real_old.get_win32 ()); if (strcasematch (real_old.get_win32 () + len_old - 4, ".lnk")) { strcpy (new_lnk_buf, newpath); strcat (new_lnk_buf, ".lnk"); newpath = new_lnk_buf; real_new.check (newpath, PC_SYM_NOFOLLOW); } } if (real_new.error || real_new.case_clash) { syscall_printf ("-1 = rename (%s, %s)", oldpath, newpath); set_errno (real_new.case_clash ? ECASECLASH : real_new.error); return -1; } if (!writable_directory (real_old) || !writable_directory (real_new)) { syscall_printf ("-1 = rename (%s, %s)", oldpath, newpath); set_errno (EACCES); return -1; } if (!real_old.exists ()) /* file to move doesn't exist */ { syscall_printf ("file to move doesn't exist"); set_errno (ENOENT); return (-1); } /* Destination file exists and is read only, change that or else the rename won't work. */ if (real_new.has_attribute (FILE_ATTRIBUTE_READONLY)) SetFileAttributes (real_new, (DWORD) real_new & ~FILE_ATTRIBUTE_READONLY); /* Shortcut hack No. 2, part 1 */ if (!real_old.issymlink () && !real_new.error && real_new.issymlink () && real_new.known_suffix && strcasematch (real_new.known_suffix, ".lnk") && (lnk_suffix = strrchr (real_new.get_win32 (), '.'))) *lnk_suffix = '\0'; if (!MoveFile (real_old, real_new)) res = -1; if (res == 0 || (GetLastError () != ERROR_ALREADY_EXISTS && GetLastError () != ERROR_FILE_EXISTS)) goto done; if (wincap.has_move_file_ex ()) { if (MoveFileEx (real_old.get_win32 (), real_new.get_win32 (), MOVEFILE_REPLACE_EXISTING)) res = 0; } else { syscall_printf ("try win95 hack"); for (int i = 0; i < 2; i++) { if (!DeleteFileA (real_new.get_win32 ()) && GetLastError () != ERROR_FILE_NOT_FOUND) { syscall_printf ("deleting %s to be paranoid", real_new.get_win32 ()); break; } else if (MoveFile (real_old.get_win32 (), real_new.get_win32 ())) { res = 0; break; } } } done: if (res) { __seterrno (); /* Reset R/O attributes if neccessary. */ if (real_new.has_attribute (FILE_ATTRIBUTE_READONLY)) SetFileAttributes (real_new, real_new); } else { /* make the new file have the permissions of the old one */ DWORD attr = real_old; #ifdef HIDDEN_DOT_FILES char *c = strrchr (real_old.get_win32 (), '\\'); if ((c && c[1] == '.') || *real_old.get_win32 () == '.') attr &= ~FILE_ATTRIBUTE_HIDDEN; c = strrchr (real_new.get_win32 (), '\\'); if ((c && c[1] == '.') || *real_new.get_win32 () == '.') attr |= FILE_ATTRIBUTE_HIDDEN; #endif SetFileAttributes (real_new, attr); /* Shortcut hack, No. 2, part 2 */ /* if the new filename was an existing shortcut, remove it now if the new filename is equal to the shortcut name without .lnk suffix. */ if (lnk_suffix) { *lnk_suffix = '.'; DeleteFile (real_new); } } syscall_printf ("%d = rename (%s, %s)", res, (char *) real_old, (char *) real_new); return res; } extern "C" int system (const char *cmdstring) { if (check_null_empty_str_errno (cmdstring)) return -1; sigframe thisframe (mainthread); int res; const char* command[4]; _sig_func_ptr oldint, oldquit; sigset_t child_block, old_mask; if (cmdstring == (const char *) NULL) return 1; oldint = signal (SIGINT, SIG_IGN); oldquit = signal (SIGQUIT, SIG_IGN); sigemptyset (&child_block); sigaddset (&child_block, SIGCHLD); (void) sigprocmask (SIG_BLOCK, &child_block, &old_mask); command[0] = "sh"; command[1] = "-c"; command[2] = cmdstring; command[3] = (const char *) NULL; if ((res = spawnvp (_P_WAIT, "sh", command)) == -1) { // when exec fails, return value should be as if shell // executed exit (127) res = 127; } signal (SIGINT, oldint); signal (SIGQUIT, oldquit); (void) sigprocmask (SIG_SETMASK, &old_mask, 0); return res; } extern "C" int setdtablesize (int size) { if (size <= (int)cygheap->fdtab.size || cygheap->fdtab.extend (size - cygheap->fdtab.size)) return 0; return -1; } extern "C" int getdtablesize () { return cygheap->fdtab.size > OPEN_MAX ? cygheap->fdtab.size : OPEN_MAX; } extern "C" size_t getpagesize () { if (!system_info.dwPageSize) GetSystemInfo (&system_info); return (int) system_info.dwPageSize; } static int check_posix_perm (const char *fname, int v) { extern int allow_ntea, allow_ntsec, allow_smbntsec; /* Windows 95/98/ME don't support file system security at all. */ if (!wincap.has_security ()) return 0; /* ntea is ok for supporting permission bits but it doesn't support full POSIX security settings. */ if (v == _PC_POSIX_PERMISSIONS && allow_ntea) return 1; if (!allow_ntsec) return 0; char *root = rootdir (strcpy ((char *)alloca (strlen (fname)), fname)); if (!allow_smbntsec && ((root[0] == '\\' && root[1] == '\\') || GetDriveType (root) == DRIVE_REMOTE)) return 0; DWORD vsn, len, flags; if (!GetVolumeInformation (root, NULL, 0, &vsn, &len, &flags, NULL, 16)) { __seterrno (); return 0; } return (flags & FS_PERSISTENT_ACLS) ? 1 : 0; } /* FIXME: not all values are correct... */ extern "C" long int fpathconf (int fd, int v) { cygheap_fdget cfd (fd); if (cfd < 0) return -1; switch (v) { case _PC_LINK_MAX: return _POSIX_LINK_MAX; case _PC_MAX_CANON: case _PC_MAX_INPUT: if (isatty (fd)) return _POSIX_MAX_CANON; else { set_errno (EBADF); return -1; } case _PC_NAME_MAX: case _PC_PATH_MAX: return PATH_MAX; case _PC_PIPE_BUF: return PIPE_BUF; case _PC_CHOWN_RESTRICTED: case _PC_NO_TRUNC: return -1; case _PC_VDISABLE: if (cfd->is_tty ()) return -1; else { set_errno (EBADF); return -1; } case _PC_POSIX_PERMISSIONS: case _PC_POSIX_SECURITY: if (cfd->get_device () == FH_DISK) return check_posix_perm (cfd->get_win32_name (), v); set_errno (EINVAL); return -1; default: set_errno (EINVAL); return -1; } } extern "C" long int pathconf (const char *file, int v) { switch (v) { case _PC_PATH_MAX: if (check_null_empty_str_errno (file)) return -1; return PATH_MAX - strlen (file); case _PC_NAME_MAX: return PATH_MAX; case _PC_LINK_MAX: return _POSIX_LINK_MAX; case _PC_MAX_CANON: case _PC_MAX_INPUT: return _POSIX_MAX_CANON; case _PC_PIPE_BUF: return PIPE_BUF; case _PC_CHOWN_RESTRICTED: case _PC_NO_TRUNC: return -1; case _PC_VDISABLE: return -1; case _PC_POSIX_PERMISSIONS: case _PC_POSIX_SECURITY: { path_conv full_path (file, PC_SYM_FOLLOW | PC_FULL); if (full_path.error) { set_errno (full_path.error); return -1; } if (full_path.is_device ()) { set_errno (EINVAL); return -1; } return check_posix_perm (full_path, v); } default: set_errno (EINVAL); return -1; } } extern "C" char * ttyname (int fd) { cygheap_fdget cfd (fd); if (cfd < 0 || !cfd->is_tty ()) { return 0; } return (char *) (cfd->ttyname ()); } extern "C" char * ctermid (char *str) { static NO_COPY char buf[16]; if (str == NULL) str = buf; if (!real_tty_attached (myself)) strcpy (str, "/dev/conin"); else __small_sprintf (str, "/dev/tty%d", myself->ctty); return str; } /* Tells stdio if it should do the cr/lf conversion for this file */ extern "C" int _cygwin_istext_for_stdio (int fd) { syscall_printf ("_cygwin_istext_for_stdio (%d)\n", fd); if (CYGWIN_VERSION_OLD_STDIO_CRLF_HANDLING) { syscall_printf (" _cifs: old API\n"); return 0; /* we do it for old apps, due to getc/putc macros */ } cygheap_fdget cfd (fd, false, false); if (cfd < 0) { syscall_printf (" _cifs: fd not open\n"); return 0; } if (cfd->get_device () != FH_DISK) { syscall_printf (" _cifs: fd not disk file\n"); return 0; } if (cfd->get_w_binary () || cfd->get_r_binary ()) { syscall_printf (" _cifs: get_*_binary\n"); return 0; } syscall_printf ("_cygwin_istext_for_stdio says yes\n"); return 1; } /* internal newlib function */ extern "C" int _fwalk (struct _reent *ptr, int (*function) (FILE *)); static int setmode_mode; static int setmode_file; static int setmode_helper (FILE *f) { if (fileno (f) != setmode_file) return 0; syscall_printf ("setmode: file was %s now %s\n", f->_flags & __SCLE ? "cle" : "raw", setmode_mode & O_TEXT ? "cle" : "raw"); if (setmode_mode & O_TEXT) f->_flags |= __SCLE; else f->_flags &= ~__SCLE; return 0; } extern "C" int getmode (int fd) { cygheap_fdget cfd (fd); if (cfd < 0) return -1; return cfd->get_flags () & (O_BINARY | O_TEXT); } /* Set a file descriptor into text or binary mode, returning the previous mode. */ extern "C" int setmode (int fd, int mode) { cygheap_fdget cfd (fd); if (cfd < 0) return -1; if (mode != O_BINARY && mode != O_TEXT && mode != 0) { set_errno (EINVAL); return -1; } /* Note that we have no way to indicate the case that writes are binary but not reads, or vice-versa. These cases can arise when using the tty or console interface. People using those interfaces should not use setmode. */ int res; if (cfd->get_w_binary () && cfd->get_r_binary ()) res = O_BINARY; else if (cfd->get_w_binset () && cfd->get_r_binset ()) res = O_TEXT; /* Specifically set O_TEXT */ else res = 0; if (!mode) cfd->reset_to_open_binmode (); else if (mode & O_BINARY) { cfd->set_w_binary (1); cfd->set_r_binary (1); } else { cfd->set_w_binary (0); cfd->set_r_binary (0); } if (_cygwin_istext_for_stdio (fd)) setmode_mode = O_TEXT; else setmode_mode = O_BINARY; setmode_file = fd; _fwalk (_REENT, setmode_helper); syscall_printf ("setmode (%d<%s>, %s) returns %s\n", fd, cfd->get_name (), mode & O_TEXT ? "text" : "binary", res & O_TEXT ? "text" : "binary"); return res; } /* ftruncate: P96 5.6.7.1 */ extern "C" int ftruncate (int fd, off_t length) { sigframe thisframe (mainthread); int res = -1; if (length < 0) set_errno (EINVAL); else { cygheap_fdget cfd (fd); if (cfd >= 0) { HANDLE h = cygheap->fdtab[fd]->get_handle (); if (cfd->get_handle ()) { /* remember curr file pointer location */ off_t prev_loc = cfd->lseek (0, SEEK_CUR); cfd->lseek (length, SEEK_SET); if (!SetEndOfFile (h)) __seterrno (); else res = 0; /* restore original file pointer location */ cfd->lseek (prev_loc, 0); } } } syscall_printf ("%d = ftruncate (%d, %d)", res, fd, length); return res; } /* truncate: Provided by SVR4 and 4.3+BSD. Not part of POSIX.1 or XPG3 */ extern "C" int truncate (const char *pathname, off_t length) { sigframe thisframe (mainthread); int fd; int res = -1; fd = open (pathname, O_RDWR); if (fd == -1) set_errno (EBADF); else { res = ftruncate (fd, length); close (fd); } syscall_printf ("%d = truncate (%s, %d)", res, pathname, length); return res; } extern "C" long get_osfhandle (int fd) { long res; cygheap_fdget cfd (fd); if (cfd >= 0) res = (long) cfd->get_handle (); else res = -1; syscall_printf ("%d = get_osfhandle (%d)", res, fd); return res; } extern "C" int statfs (const char *fname, struct statfs *sfs) { sigframe thisframe (mainthread); if (!sfs) { set_errno (EFAULT); return -1; } path_conv full_path (fname, PC_SYM_FOLLOW | PC_FULL); char *root = rootdir (full_path); syscall_printf ("statfs %s", root); DWORD spc, bps, freec, totalc; if (!GetDiskFreeSpace (root, &spc, &bps, &freec, &totalc)) { __seterrno (); return -1; } DWORD vsn, maxlen, flags; if (!GetVolumeInformation (root, NULL, 0, &vsn, &maxlen, &flags, NULL, 0)) { __seterrno (); return -1; } sfs->f_type = flags; sfs->f_bsize = spc*bps; sfs->f_blocks = totalc; sfs->f_bfree = sfs->f_bavail = freec; sfs->f_files = -1; sfs->f_ffree = -1; sfs->f_fsid = vsn; sfs->f_namelen = maxlen; return 0; } extern "C" int fstatfs (int fd, struct statfs *sfs) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) return -1; return statfs (cfd->get_name (), sfs); } /* setpgid: POSIX 4.3.3.1 */ extern "C" int setpgid (pid_t pid, pid_t pgid) { sigframe thisframe (mainthread); int res = -1; if (pid == 0) pid = getpid (); if (pgid == 0) pgid = pid; if (pgid < 0) { set_errno (EINVAL); goto out; } else { pinfo p (pid); if (!p) { set_errno (ESRCH); goto out; } /* A process may only change the process group of itself and its children */ if (p == myself || p->ppid == myself->pid) { p->pgid = pgid; if (p->pid != p->pgid) p->set_has_pgid_children (0); res = 0; } else { set_errno (EPERM); goto out; } } out: syscall_printf ("pid %d, pgid %d, res %d", pid, pgid, res); return res; } extern "C" pid_t getpgid (pid_t pid) { sigframe thisframe (mainthread); if (pid == 0) pid = getpid (); pinfo p (pid); if (p == 0) { set_errno (ESRCH); return -1; } return p->pgid; } extern "C" int setpgrp (void) { sigframe thisframe (mainthread); return setpgid (0, 0); } extern "C" pid_t getpgrp (void) { sigframe thisframe (mainthread); return getpgid (0); } extern "C" char * ptsname (int fd) { sigframe thisframe (mainthread); cygheap_fdget cfd (fd); if (cfd < 0) return 0; return (char *) (cfd->ptsname ()); } /* FIXME: what is this? */ extern "C" int regfree () { return 0; } /* mknod was the call to create directories before the introduction of mkdir in 4.2BSD and SVR3. Use of mknod required superuser privs so the mkdir command had to be setuid root. Although mknod hasn't been implemented yet, some GNU tools (e.g. the fileutils) assume its existence so we must provide a stub that always fails. */ extern "C" int mknod (const char *_path, mode_t mode, dev_t dev) { set_errno (ENOSYS); return -1; } extern "C" int mkfifo (const char *_path, mode_t mode) { set_errno (ENOSYS); return -1; } /* setgid: POSIX 4.2.2.1 */ extern "C" int setgid (gid_t gid) { int ret = setegid (gid); if (!ret) cygheap->user.real_gid = myself->gid; return ret; } /* setuid: POSIX 4.2.2.1 */ extern "C" int setuid (uid_t uid) { int ret = seteuid (uid); if (!ret) cygheap->user.real_uid = myself->uid; debug_printf ("real: %d, effective: %d", cygheap->user.real_uid, myself->uid); return ret; } extern struct passwd *internal_getlogin (cygheap_user &user); /* seteuid: standards? */ extern "C" int seteuid (uid_t uid) { sigframe thisframe (mainthread); if (wincap.has_security ()) { char orig_username[UNLEN + 1]; char orig_domain[INTERNET_MAX_HOST_NAME_LENGTH + 1]; char username[UNLEN + 1]; DWORD ulen = UNLEN + 1; char domain[INTERNET_MAX_HOST_NAME_LENGTH + 1]; DWORD dlen = INTERNET_MAX_HOST_NAME_LENGTH + 1; SID_NAME_USE use; if (uid == (uid_t) -1 || uid == myself->uid) { debug_printf ("new euid == current euid, nothing happens"); return 0; } struct passwd *pw_new = getpwuid (uid); if (!pw_new) { set_errno (EINVAL); return -1; } cygsid tok_usersid; DWORD siz; char *env; orig_username[0] = orig_domain[0] = '\0'; if ((env = getenv ("USERNAME"))) strncat (orig_username, env, UNLEN + 1); if ((env = getenv ("USERDOMAIN"))) strncat (orig_domain, env, INTERNET_MAX_HOST_NAME_LENGTH + 1); if (uid == cygheap->user.orig_uid) { debug_printf ("RevertToSelf () (uid == orig_uid, token=%d)", cygheap->user.token); RevertToSelf (); if (cygheap->user.token != INVALID_HANDLE_VALUE) cygheap->user.impersonated = FALSE; HANDLE ptok = INVALID_HANDLE_VALUE; if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &ptok)) debug_printf ("OpenProcessToken(): %E\n"); else if (!GetTokenInformation (ptok, TokenUser, &tok_usersid, sizeof tok_usersid, &siz)) debug_printf ("GetTokenInformation(): %E"); else if (!LookupAccountSid (NULL, tok_usersid, username, &ulen, domain, &dlen, &use)) debug_printf ("LookupAccountSid(): %E"); else { setenv ("USERNAME", username, 1); setenv ("USERDOMAIN", domain, 1); } if (ptok != INVALID_HANDLE_VALUE) CloseHandle (ptok); } else { cygsid usersid, pgrpsid, tok_pgrpsid; HANDLE sav_token = INVALID_HANDLE_VALUE; BOOL sav_impersonation; BOOL current_token_is_internal_token = FALSE; BOOL explicitely_created_token = FALSE; struct group *gr = getgrgid (myself->gid); debug_printf ("myself->gid: %d, gr: %d", myself->gid, gr); usersid.getfrompw (pw_new); pgrpsid.getfromgr (gr); /* Only when ntsec is ON! */ /* Check if new user == user of impersonation token and - if reasonable - new pgrp == pgrp of impersonation token. */ if (allow_ntsec && cygheap->user.token != INVALID_HANDLE_VALUE) { if (!GetTokenInformation (cygheap->user.token, TokenUser, &tok_usersid, sizeof tok_usersid, &siz)) { debug_printf ("GetTokenInformation(): %E"); tok_usersid = NO_SID; } if (!GetTokenInformation (cygheap->user.token, TokenPrimaryGroup, &tok_pgrpsid, sizeof tok_pgrpsid, &siz)) { debug_printf ("GetTokenInformation(): %E"); tok_pgrpsid = NO_SID; } /* Check if the current user token was internally created. */ TOKEN_SOURCE ts; if (!GetTokenInformation (cygheap->user.token, TokenSource, &ts, sizeof ts, &siz)) debug_printf ("GetTokenInformation(): %E"); else if (!memcmp (ts.SourceName, "Cygwin.1", 8)) current_token_is_internal_token = TRUE; if ((usersid && tok_usersid && usersid != tok_usersid) || /* Check for pgrp only if current token is an internal token. Otherwise the external provided token is very likely overwritten here. */ (current_token_is_internal_token && pgrpsid && tok_pgrpsid && pgrpsid != tok_pgrpsid)) { /* If not, RevertToSelf and close old token. */ debug_printf ("tsid != usersid"); RevertToSelf (); sav_token = cygheap->user.token; sav_impersonation = cygheap->user.impersonated; cygheap->user.token = INVALID_HANDLE_VALUE; cygheap->user.impersonated = FALSE; } } /* Only when ntsec is ON! */ /* If no impersonation token is available, try to authenticate using NtCreateToken() or subauthentication. */ if (allow_ntsec && cygheap->user.token == INVALID_HANDLE_VALUE) { HANDLE ptok = INVALID_HANDLE_VALUE; ptok = create_token (usersid, pgrpsid); if (ptok != INVALID_HANDLE_VALUE) explicitely_created_token = TRUE; else { /* create_token failed. Try subauthentication. */ debug_printf ("create token failed, try subauthentication."); ptok = subauth (pw_new); } if (ptok != INVALID_HANDLE_VALUE) { cygwin_set_impersonation_token (ptok); /* If sav_token was internally created, destroy it. */ if (sav_token != INVALID_HANDLE_VALUE && current_token_is_internal_token) CloseHandle (sav_token); } else if (sav_token != INVALID_HANDLE_VALUE) cygheap->user.token = sav_token; } /* If no impersonation is active but an impersonation token is available, try to impersonate. */ if (cygheap->user.token != INVALID_HANDLE_VALUE && !cygheap->user.impersonated) { debug_printf ("Impersonate (uid == %d)", uid); RevertToSelf (); /* If the token was explicitely created, all information has already been set correctly. */ if (!explicitely_created_token) { /* Try setting owner to same value as user. */ if (usersid && !SetTokenInformation (cygheap->user.token, TokenOwner, &usersid, sizeof usersid)) debug_printf ("SetTokenInformation(user.token, " "TokenOwner): %E"); /* Try setting primary group in token to current group if token not explicitely created. */ if (pgrpsid && !SetTokenInformation (cygheap->user.token, TokenPrimaryGroup, &pgrpsid, sizeof pgrpsid)) debug_printf ("SetTokenInformation(user.token, " "TokenPrimaryGroup): %E"); } /* Now try to impersonate. */ if (!LookupAccountSid (NULL, usersid, username, &ulen, domain, &dlen, &use)) debug_printf ("LookupAccountSid (): %E"); else if (!ImpersonateLoggedOnUser (cygheap->user.token)) system_printf ("Impersonating (%d) in set(e)uid failed: %E", cygheap->user.token); else { cygheap->user.impersonated = TRUE; setenv ("USERNAME", username, 1); setenv ("USERDOMAIN", domain, 1); } } } cygheap_user user; /* user.token is used in internal_getlogin () to determine if impersonation is active. If so, the token is used for retrieving user's SID. */ user.token = cygheap->user.impersonated ? cygheap->user.token : INVALID_HANDLE_VALUE; /* Unsetting these both env vars is necessary to get NetUserGetInfo() called in internal_getlogin (). Otherwise the wrong path is used after a user switch, probably. */ unsetenv ("HOMEDRIVE"); unsetenv ("HOMEPATH"); struct passwd *pw_cur = internal_getlogin (user); if (pw_cur != pw_new) { debug_printf ("Diffs!!! token: %d, cur: %d, new: %d, orig: %d", cygheap->user.token, pw_cur->pw_uid, pw_new->pw_uid, cygheap->user.orig_uid); setenv ("USERNAME", orig_username, 1); setenv ("USERDOMAIN", orig_domain, 1); set_errno (EPERM); return -1; } myself->uid = uid; cygheap->user = user; } else set_errno (ENOSYS); debug_printf ("real: %d, effective: %d", cygheap->user.real_uid, myself->uid); return 0; } /* setegid: from System V. */ extern "C" int setegid (gid_t gid) { sigframe thisframe (mainthread); if (wincap.has_security ()) { if (gid != (gid_t) -1) { struct group *gr; if (!(gr = getgrgid (gid))) { set_errno (EINVAL); return -1; } myself->gid = gid; if (allow_ntsec) { cygsid gsid; HANDLE ptok; if (gsid.getfromgr (gr)) { if (!OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_DEFAULT, &ptok)) debug_printf ("OpenProcessToken(): %E\n"); else { if (!SetTokenInformation (ptok, TokenPrimaryGroup, &gsid, sizeof gsid)) debug_printf ("SetTokenInformation(myself, " "TokenPrimaryGroup): %E"); CloseHandle (ptok); } } } } } else set_errno (ENOSYS); return 0; } /* chroot: privileged Unix system call. */ /* FIXME: Not privileged here. How should this be done? */ extern "C" int chroot (const char *newroot) { sigframe thisframe (mainthread); path_conv path (newroot, PC_SYM_FOLLOW | PC_FULL); int ret; if (path.error) ret = -1; else if (!path.exists ()) { set_errno (ENOENT); ret = -1; } else if (!path.isdir ()) { set_errno (ENOTDIR); ret = -1; } else { char buf[MAX_PATH]; normalize_posix_path (newroot, buf); cygheap->root.set (buf, path); ret = 0; } syscall_printf ("%d = chroot (%s)", ret ? get_errno () : 0, newroot ? newroot : "NULL"); return ret; } extern "C" int creat (const char *path, mode_t mode) { sigframe thisframe (mainthread); return open (path, O_WRONLY | O_CREAT | O_TRUNC, mode); } extern "C" void __assertfail () { exit (99); } extern "C" int getw (FILE *fp) { sigframe thisframe (mainthread); int w, ret; ret = fread (&w, sizeof (int), 1, fp); return ret != 1 ? EOF : w; } extern "C" int putw (int w, FILE *fp) { sigframe thisframe (mainthread); int ret; ret = fwrite (&w, sizeof (int), 1, fp); if (feof (fp) || ferror (fp)) return -1; return 0; } extern "C" int wcscmp (const wchar_t *s1, const wchar_t *s2) { while (*s1 && *s1 == *s2) { s1++; s2++; } return (* (unsigned short *) s1) - (* (unsigned short *) s2); } extern "C" size_t wcslen (const wchar_t *s1) { int l = 0; while (s1[l]) l++; return l; } /* FIXME: to do this right, maybe work out the usoft va_list machine and use wsvprintfW instead? */ extern "C" int wprintf (const char *fmt, ...) { va_list ap; int ret; va_start (ap, fmt); ret = vprintf (fmt, ap); va_end (ap); return ret; } extern "C" int vhangup () { set_errno (ENOSYS); return -1; } extern "C" _PTR memccpy (_PTR out, const _PTR in, int c, size_t len) { const char *inc = (char *) in; char *outc = (char *) out; while (len) { char x = *inc++; *outc++ = x; if (x == c) return outc; len --; } return 0; } extern "C" int nice (int incr) { sigframe thisframe (mainthread); DWORD priority[] = { IDLE_PRIORITY_CLASS, IDLE_PRIORITY_CLASS, NORMAL_PRIORITY_CLASS, HIGH_PRIORITY_CLASS, REALTIME_PRIORITY_CLASS, REALTIME_PRIORITY_CLASS }; int curr = 2; switch (GetPriorityClass (hMainProc)) { case IDLE_PRIORITY_CLASS: curr = 1; break; case NORMAL_PRIORITY_CLASS: curr = 2; break; case HIGH_PRIORITY_CLASS: curr = 3; break; case REALTIME_PRIORITY_CLASS: curr = 4; break; } if (incr > 0) incr = -1; else if (incr < 0) incr = 1; if (SetPriorityClass (hMainProc, priority[curr + incr]) == FALSE) { __seterrno (); return -1; } return 0; } /* * Find the first bit set in I. */ extern "C" int ffs (int i) { static const unsigned char table[] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8 }; unsigned long int a; unsigned long int x = i & -i; a = x <= 0xffff ? (x <= 0xff ? 0 : 8) : (x <= 0xffffff ? 16 : 24); return table[x >> a] + a; } extern "C" void login (struct utmp *ut) { sigframe thisframe (mainthread); register int fd; int currtty = ttyslot (); if (currtty >= 0 && (fd = open (_PATH_UTMP, O_WRONLY | O_CREAT | O_BINARY, 0644)) >= 0) { (void) lseek (fd, (long) (currtty * sizeof (struct utmp)), SEEK_SET); (void) write (fd, (char *) ut, sizeof (struct utmp)); (void) close (fd); } if ((fd = open (_PATH_WTMP, O_WRONLY | O_APPEND | O_BINARY, 0)) >= 0) { (void) write (fd, (char *) ut, sizeof (struct utmp)); (void) close (fd); } } /* It isn't possible to use unix-style I/O function in logout code because cygwin's I/O subsystem may be inaccessible at logout () call time. FIXME (cgf): huh? */ extern "C" int logout (char *line) { sigframe thisframe (mainthread); int res = 0; HANDLE ut_fd; static const char path_utmp[] = _PATH_UTMP; path_conv win32_path (path_utmp); if (win32_path.error) return 0; ut_fd = CreateFile (win32_path.get_win32 (), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, &sec_none_nih, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (ut_fd != INVALID_HANDLE_VALUE) { struct utmp *ut; struct utmp ut_buf[100]; off_t pos = 0; /* Position in file */ DWORD rd; while (!res && ReadFile (ut_fd, ut_buf, sizeof ut_buf, &rd, NULL) && rd != 0) { struct utmp *ut_end = (struct utmp *) ((char *) ut_buf + rd); for (ut = ut_buf; ut < ut_end; ut++, pos += sizeof (*ut)) if (ut->ut_name[0] && strncmp (ut->ut_line, line, sizeof (ut->ut_line)) == 0) /* Found the entry for LINE; mark it as logged out. */ { /* Zero out entries describing who's logged in. */ bzero (ut->ut_name, sizeof (ut->ut_name)); bzero (ut->ut_host, sizeof (ut->ut_host)); time (&ut->ut_time); /* Now seek back to the position in utmp at which UT occured, and write the new version of UT there. */ if ((SetFilePointer (ut_fd, pos, 0, FILE_BEGIN) != 0xFFFFFFFF) && (WriteFile (ut_fd, (char *) ut, sizeof (*ut), &rd, NULL))) { res = 1; break; } } } CloseHandle (ut_fd); } return res; } static int utmp_fd = -2; static char *utmp_file = (char *) _PATH_UTMP; static struct utmp utmp_data; extern "C" void setutent () { sigframe thisframe (mainthread); if (utmp_fd == -2) { utmp_fd = _open (utmp_file, O_RDONLY); } _lseek (utmp_fd, 0, SEEK_SET); } extern "C" void endutent () { sigframe thisframe (mainthread); _close (utmp_fd); utmp_fd = -2; } extern "C" void utmpname (_CONST char *file) { sigframe thisframe (mainthread); if (check_null_empty_str (file)) { debug_printf ("Invalid file"); return; } utmp_file = strdup (file); debug_printf ("New UTMP file: %s", utmp_file); } extern "C" struct utmp * getutent () { sigframe thisframe (mainthread); if (utmp_fd == -2) setutent (); if (_read (utmp_fd, &utmp_data, sizeof (utmp_data)) != sizeof (utmp_data)) return NULL; return &utmp_data; } extern "C" struct utmp * getutid (struct utmp *id) { sigframe thisframe (mainthread); if (check_null_invalid_struct_errno (id)) return NULL; while (_read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data)) { switch (id->ut_type) { #if 0 /* Not available in Cygwin. */ case RUN_LVL: case BOOT_TIME: case OLD_TIME: case NEW_TIME: if (id->ut_type == utmp_data.ut_type) return &utmp_data; break; #endif case INIT_PROCESS: case LOGIN_PROCESS: case USER_PROCESS: case DEAD_PROCESS: if (id->ut_id == utmp_data.ut_id) return &utmp_data; break; default: return NULL; } } return NULL; } extern "C" struct utmp * getutline (struct utmp *line) { sigframe thisframe (mainthread); if (check_null_invalid_struct_errno (line)) return NULL; while (_read (utmp_fd, &utmp_data, sizeof (utmp_data)) == sizeof (utmp_data)) { if ((utmp_data.ut_type == LOGIN_PROCESS || utmp_data.ut_type == USER_PROCESS) && !strncmp (utmp_data.ut_line, line->ut_line, sizeof (utmp_data.ut_line))) return &utmp_data; } return NULL; }