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newlib-cygwin/winsup/cygwin/syscalls.cc

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/* syscalls.cc: syscalls
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 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. */
#define fstat __FOOfstat__
#define lstat __FOOlstat__
#define stat __FOOstat__
#define _close __FOO_close__
#define _lseek __FOO_lseek__
#define _open __FOO_open__
#define _read __FOO_read__
#define _write __FOO_write__
#define _open64 __FOO_open64__
#define _lseek64 __FOO_lseek64__
#define _fstat64 __FOO_fstat64__
#include "winsup.h"
#include <sys/stat.h>
#include <sys/vfs.h> /* needed for statfs */
#include <pwd.h>
#include <grp.h>
#include <stdlib.h>
#include <stdio.h>
#include <process.h>
#include <utmp.h>
#include <sys/uio.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include <unistd.h>
#include <setjmp.h>
#include <winnls.h>
#include <wininet.h>
#include <lmcons.h> /* for UNLEN */
#include <rpc.h>
#undef fstat
#undef lstat
#undef stat
#include <cygwin/version.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "sigproc.h"
#include "pinfo.h"
#include "shared_info.h"
#include "cygheap.h"
#define NEED_VFORK
#include "perthread.h"
#include "pwdgrp.h"
#include "cpuid.h"
#include "registry.h"
#undef _close
#undef _lseek
#undef _open
#undef _read
#undef _write
#undef _open64
#undef _lseek64
#undef _fstat64
suffix_info stat_suffixes[] =
{
suffix_info ("", 1),
suffix_info (".exe", 1),
suffix_info (NULL)
};
SYSTEM_INFO system_info;
static int __stdcall mknod_worker (const char *, mode_t, mode_t, _major_t,
_minor_t);
static int __stdcall stat_worker (const char *name, struct __stat64 *buf,
int nofollow) __attribute__ ((regparm (3)));
/* 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 ()
{
cygheap->fdtab.lock ();
fhandler_base *fh;
for (int i = 0; i < (int) cygheap->fdtab.size; i++)
if ((fh = cygheap->fdtab[i]) != NULL)
{
#ifdef DEBUGGING
debug_printf ("closing fd %d", i);
#endif
fh->close ();
cygheap->fdtab.release (i);
}
if (cygheap->ctty)
cygheap->close_ctty ();
cygheap->fdtab.unlock ();
user_shared->delqueue.process_queue ();
}
int
dup (int fd)
{
return cygheap->fdtab.dup2 (fd, cygheap_fdnew ());
}
int
dup2 (int oldfd, int newfd)
{
return cygheap->fdtab.dup2 (oldfd, newfd);
}
extern "C" int
unlink (const char *ourname)
{
int res = -1;
DWORD devn;
path_conv win32_name (ourname, PC_SYM_NOFOLLOW | PC_FULL);
if (win32_name.error)
{
set_errno (win32_name.error);
goto done;
}
if ((devn = win32_name.get_devn ()) == FH_PROC || devn == FH_REGISTRY
|| devn == FH_PROCESS)
{
set_errno (EROFS);
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");
set_errno (EPERM);
goto done;
}
bool setattrs;
if (!((DWORD) win32_name & (FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM)))
setattrs = false;
else
{
/* Allow us to delete even if read-only */
setattrs = SetFileAttributes (win32_name,
(DWORD) win32_name
& ~(FILE_ATTRIBUTE_READONLY
| FILE_ATTRIBUTE_SYSTEM));
}
/* Attempt to use "delete on close" semantics to handle removing
a file which may be open. */
if (wincap.has_delete_on_close ())
{
HANDLE h;
h = CreateFile (win32_name, 0, FILE_SHARE_READ, &sec_none_nih,
OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, 0);
if (h != INVALID_HANDLE_VALUE)
{
if (wincap.has_hard_links () && setattrs)
(void) SetFileAttributes (win32_name, (DWORD) win32_name);
BOOL res = CloseHandle (h);
syscall_printf ("%d = CloseHandle (%p)", res, h);
if (GetFileAttributes (win32_name) == INVALID_FILE_ATTRIBUTES
|| !win32_name.isremote ())
{
syscall_printf ("CreateFile (FILE_FLAG_DELETE_ON_CLOSE) succeeded");
goto ok;
}
else
{
syscall_printf ("CreateFile (FILE_FLAG_DELETE_ON_CLOSE) failed");
if (setattrs)
SetFileAttributes (win32_name, (DWORD) win32_name & ~(FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM));
}
}
}
/* Try a delete with attributes reset */
if (DeleteFile (win32_name))
{
syscall_printf ("DeleteFile after CreateFile/CloseHandle succeeded");
goto ok;
}
DWORD lasterr;
lasterr = GetLastError ();
(void) SetFileAttributes (win32_name, (DWORD) win32_name);
/* 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;
/* 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. */
user_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_r (struct _reent *, 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" 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;
}
extern "C" pid_t
_getpid_r (struct _reent *)
{
return getpid ();
}
/* 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)
{
#ifdef NEWVFORK
vfork_save *vf = vfork_storage.val ();
/* This is a horrible, horrible kludge */
if (vf && vf->pid < 0)
{
pid_t pid = fork ();
if (pid > 0)
{
syscall_printf ("longjmping due to vfork");
vf->restore_pid (pid);
}
/* assuming that fork was successful */
}
#endif
if (myself->pgid == myself->pid)
syscall_printf ("hmm. pgid %d pid %d", myself->pgid, myself->pid);
else
{
if (myself->ctty >= 0 && cygheap->open_fhs <= 0)
{
syscall_printf ("freeing console");
FreeConsole ();
}
myself->ctty = -1;
myself->sid = getpid ();
myself->pgid = getpid ();
if (cygheap->ctty)
cygheap->close_ctty ();
syscall_printf ("sid %d, pgid %d, ctty %d, open_fhs %d", myself->sid,
myself->pgid, myself->ctty, cygheap->open_fhs);
return myself->sid;
}
set_errno (EPERM);
return -1;
}
extern "C" pid_t
getsid (pid_t pid)
{
pid_t res;
if (!pid)
res = myself->sid;
else
{
pinfo p (pid);
if (p)
res = p->sid;
else
{
set_errno (ESRCH);
res = -1;
}
}
return res;
}
extern "C" ssize_t
read (int fd, void *ptr, size_t len)
{
const iovec iov =
{
iov_base: ptr,
iov_len: len
};
return readv (fd, &iov, 1);
}
extern "C" ssize_t _read (int, void *, size_t)
__attribute__ ((alias ("read")));
extern "C" ssize_t
write (int fd, const void *ptr, size_t len)
{
const struct iovec iov =
{
iov_base: (void *) ptr, // const_cast
iov_len: len
};
return writev (fd, &iov, 1);
}
extern "C" ssize_t _write (int fd, const void *ptr, size_t len)
__attribute__ ((alias ("write")));
extern "C" ssize_t
readv (int fd, const struct iovec *const iov, const int iovcnt)
{
extern int sigcatchers;
const int e = get_errno ();
int res = -1;
const ssize_t tot = check_iovec_for_read (iov, iovcnt);
if (tot <= 0)
{
res = tot;
goto done;
}
while (1)
{
sig_dispatch_pending ();
cygheap_fdget cfd (fd);
if (cfd < 0)
break;
if ((cfd->get_flags () & O_ACCMODE) == O_WRONLY)
{
set_errno (EBADF);
break;
}
DWORD wait = cfd->is_nonblocking () ? 0 : INFINITE;
/* Could block, so let user know we at least got here. */
syscall_printf ("readv (%d, %p, %d) %sblocking, sigcatchers %d",
fd, iov, iovcnt, wait ? "" : "non", sigcatchers);
if (wait && (!cfd->is_slow () || cfd->uninterruptible_io ()))
debug_printf ("no need to call ready_for_read");
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 ())
break;
/* 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 ())
{
res = -1;
break;
}
if (res > bg_eof)
{
myself->process_state |= PID_TTYIN;
if (!cfd.isopen ())
{
res = -1;
break;
}
res = cfd->readv (iov, iovcnt, tot);
myself->process_state &= ~PID_TTYIN;
}
out:
if (res >= 0 || get_errno () != EINTR || !_my_tls.call_signal_handler ())
break;
set_errno (e);
}
done:
syscall_printf ("%d = readv (%d, %p, %d), errno %d", res, fd, iov, iovcnt,
get_errno ());
MALLOC_CHECK;
return res;
}
extern "C" ssize_t
writev (const int fd, const struct iovec *const iov, const int iovcnt)
{
int res = -1;
sig_dispatch_pending ();
const ssize_t tot = check_iovec_for_write (iov, iovcnt);
cygheap_fdget cfd (fd);
if (cfd < 0)
goto done;
if (tot <= 0)
{
res = tot;
goto done;
}
if ((cfd->get_flags () & O_ACCMODE) == O_RDONLY)
{
set_errno (EBADF);
goto done;
}
/* Could block, so let user know we at least got here. */
if (fd == 1 || fd == 2)
paranoid_printf ("writev (%d, %p, %d)", fd, iov, iovcnt);
else
syscall_printf ("writev (%d, %p, %d)", fd, iov, iovcnt);
res = cfd->bg_check (SIGTTOU);
if (res > (int) bg_eof)
{
myself->process_state |= PID_TTYOU;
res = cfd->writev (iov, iovcnt, tot);
myself->process_state &= ~PID_TTYOU;
}
done:
if (fd == 1 || fd == 2)
paranoid_printf ("%d = write (%d, %p, %d), errno %d",
res, fd, iov, iovcnt, get_errno ());
else
syscall_printf ("%d = write (%d, %p, %d), errno %d",
res, fd, iov, iovcnt, get_errno ());
MALLOC_CHECK;
return res;
}
/* _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;
sig_dispatch_pending ();
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)
{
if (!(fh = build_fh_name (unix_path, NULL, PC_SYM_FOLLOW)))
res = -1; // errno already set
else if (fh->is_fs_special () && fh->device_access_denied (flags))
{
delete fh;
res = -1;
}
else if (!fh->open (flags, (mode & 07777) & ~cygheap->umask))
{
delete fh;
res = -1;
}
else
{
cygheap->fdtab[fd] = fh;
if ((res = fd) <= 2)
set_std_handle (res);
}
}
}
syscall_printf ("%d = open (%s, %p)", res, unix_path, flags);
return res;
}
extern "C" int _open (const char *, int flags, ...)
__attribute__ ((alias ("open")));
extern "C" int _open64 (const char *, int flags, ...)
__attribute__ ((alias ("open")));
extern "C" _off64_t
lseek64 (int fd, _off64_t pos, int dir)
{
_off64_t res;
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 _lseek64 (int fd, _off64_t pos, int dir)
__attribute__ ((alias ("lseek64")));
extern "C" _off_t
lseek (int fd, _off_t pos, int dir)
{
return lseek64 (fd, (_off64_t) pos, dir);
}
extern "C" _off_t _lseek (int, _off_t, int)
__attribute__ ((alias ("lseek")));
extern "C" int
close (int fd)
{
int res;
syscall_printf ("close (%d)", fd);
MALLOC_CHECK;
cygheap_fdget cfd (fd, true);
if (cfd < 0)
res = -1;
else
{
res = cfd->close ();
cfd.release ();
}
syscall_printf ("%d = close (%d)", res, fd);
MALLOC_CHECK;
return res;
}
extern "C" int _close (int) __attribute__ ((alias ("close")));
extern "C" int
isatty (int fd)
{
int res;
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;
path_conv real_a (a, PC_SYM_NOFOLLOW | PC_FULL);
path_conv real_b (b, PC_SYM_NOFOLLOW | PC_FULL);
extern bool allow_winsymlinks;
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[strlen (real_b) - 1] == '.')
{
syscall_printf ("trailing dot, bailing out");
set_errno (EINVAL);
goto done;
}
/* Shortcut hack. */
char new_lnk_buf[CYG_MAX_PATH + 5];
if (allow_winsymlinks && real_a.is_lnk_symlink () && !real_b.case_clash)
{
strcpy (new_lnk_buf, b);
strcat (new_lnk_buf, ".lnk");
b = new_lnk_buf;
real_b.check (b, PC_SYM_NOFOLLOW | PC_FULL);
}
/* Try to make hard link first on Windows NT */
if (wincap.has_hard_links ())
{
if (CreateHardLinkA (real_b, real_a, NULL))
goto success;
HANDLE hFileSource;
WIN32_STREAM_ID StreamId;
DWORD dwBytesWritten;
LPVOID lpContext;
DWORD cbPathLen;
DWORD StreamSize;
WCHAR wbuf[CYG_MAX_PATH];
BOOL bSuccess;
hFileSource = CreateFile (real_a, 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;
}
cbPathLen = sys_mbstowcs (wbuf, real_b, CYG_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;
lpContext = NULL;
/* 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;
success:
res = 0;
if (!allow_winsymlinks && real_a.is_lnk_symlink ())
SetFileAttributes (real_b, (DWORD) real_a
| FILE_ATTRIBUTE_SYSTEM
| FILE_ATTRIBUTE_READONLY);
goto done;
}
docopy:
/* do this with a copy */
if (CopyFileA (real_a, real_b, 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, __uid32_t uid, __gid32_t gid)
{
int res;
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_auto_device () && !win32_path.issocket ())
{
res = 0;
goto done;
}
mode_t attrib = 0;
if (win32_path.isdir ())
attrib |= S_IFDIR;
res = get_file_attribute (win32_path.has_acls (), NULL,
win32_path.get_win32 (), &attrib);
if (!res)
res = set_file_attribute (win32_path.has_acls (), NULL, win32_path,
uid, gid, attrib);
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
chown32 (const char * name, __uid32_t uid, __gid32_t gid)
{
return chown_worker (name, PC_SYM_FOLLOW, uid, gid);
}
extern "C" int
chown (const char * name, __uid16_t uid, __gid16_t gid)
{
return chown_worker (name, PC_SYM_FOLLOW,
uid16touid32 (uid), gid16togid32 (gid));
}
extern "C" int
lchown32 (const char * name, __uid32_t uid, __gid32_t gid)
{
return chown_worker (name, PC_SYM_NOFOLLOW, uid, gid);
}
extern "C" int
lchown (const char * name, __uid16_t uid, __gid16_t gid)
{
return chown_worker (name, PC_SYM_NOFOLLOW,
uid16touid32 (uid), gid16togid32 (gid));
}
extern "C" int
fchown32 (int fd, __uid32_t uid, __gid32_t gid)
{
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);
}
extern "C" int
fchown (int fd, __uid16_t uid, __gid16_t gid)
{
return fchown32 (fd, uid16touid32 (uid), gid16togid32 (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;
}
int
chmod_device (path_conv& pc, mode_t mode)
{
return mknod_worker (pc, pc.dev.mode & S_IFMT, mode, pc.dev.major, pc.dev.minor);
}
/* chmod: POSIX 5.6.4.1 */
extern "C" int
chmod (const char *path, mode_t mode)
{
int res = -1;
fhandler_base *fh = build_fh_name (path, NULL, PC_SYM_FOLLOW | PC_FULL,
stat_suffixes);
if (fh->error ())
{
debug_printf ("got %d error from build_fh_name", fh->error ());
set_errno (fh->error ());
}
else
res = fh->fchmod (mode);
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)
{
cygheap_fdget cfd (fd);
if (cfd < 0)
{
syscall_printf ("-1 = fchmod (%d, 0%o)", fd, mode);
return -1;
}
return cfd->fchmod (mode);
}
static void
stat64_to_stat32 (struct __stat64 *src, struct __stat32 *dst)
{
dst->st_dev = ((src->st_dev >> 8) & 0xff00) | (src->st_dev & 0xff);
dst->st_ino = ((unsigned) (src->st_ino >> 32)) | (unsigned) src->st_ino;
dst->st_mode = src->st_mode;
dst->st_nlink = src->st_nlink;
dst->st_uid = src->st_uid;
dst->st_gid = src->st_gid;
dst->st_rdev = ((src->st_rdev >> 8) & 0xff00) | (src->st_rdev & 0xff);
dst->st_size = src->st_size;
dst->st_atim = src->st_atim;
dst->st_mtim = src->st_mtim;
dst->st_ctim = src->st_ctim;
dst->st_blksize = src->st_blksize;
dst->st_blocks = src->st_blocks;
}
extern "C" int
fstat64 (int fd, struct __stat64 *buf)
{
int res;
cygheap_fdget cfd (fd);
if (cfd < 0)
res = -1;
else
{
memset (buf, 0, sizeof (struct __stat64));
res = cfd->fstat (buf);
if (!res)
{
if (!buf->st_ino)
buf->st_ino = hash_path_name (0, cfd->get_win32_name ());
if (!buf->st_dev)
buf->st_dev = cfd->get_device ();
if (!buf->st_rdev)
buf->st_rdev = buf->st_dev;
}
}
syscall_printf ("%d = fstat (%d, %p)", res, fd, buf);
return res;
}
extern "C" int
_fstat64_r (struct _reent *ptr, int fd, struct __stat64 *buf)
{
int ret;
set_errno (0);
if ((ret = fstat64 (fd, buf)) == -1 && get_errno () != 0)
ptr->_errno = get_errno ();
return ret;
}
extern "C" int
fstat (int fd, struct __stat32 *buf)
{
struct __stat64 buf64;
int ret = fstat64 (fd, &buf64);
if (!ret)
stat64_to_stat32 (&buf64, buf);
return ret;
}
extern "C" int
_fstat_r (struct _reent *ptr, int fd, struct __stat32 *buf)
{
int ret;
set_errno (0);
if ((ret = fstat (fd, buf)) == -1 && get_errno () != 0)
ptr->_errno = get_errno ();
return ret;
}
/* fsync: P96 6.6.1.1 */
extern "C" int
fsync (int fd)
{
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: SUSv3 */
extern "C" void
sync ()
{
}
/* Cygwin internal */
static int __stdcall
stat_worker (const char *name, struct __stat64 *buf, int nofollow)
{
int res = -1;
fhandler_base *fh = NULL;
if (check_null_invalid_struct_errno (buf))
goto done;
fh = build_fh_name (name, NULL, (nofollow ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW)
| PC_FULL, stat_suffixes);
if (fh->error ())
{
debug_printf ("got %d error from build_fh_name", fh->error ());
set_errno (fh->error ());
}
else
{
debug_printf ("(%s, %p, %d, %p), file_attributes %d", name, buf, nofollow,
fh, (DWORD) *fh);
memset (buf, 0, sizeof (*buf));
res = fh->fstat (buf);
if (!res)
{
if (!buf->st_ino)
buf->st_ino = hash_path_name (0, fh->get_win32_name ());
if (!buf->st_dev)
buf->st_dev = fh->get_device ();
if (!buf->st_rdev)
buf->st_rdev = buf->st_dev;
}
}
done:
if (fh)
delete fh;
MALLOC_CHECK;
syscall_printf ("%d = (%s, %p)", res, name, buf);
return res;
}
extern "C" int
stat64 (const char *name, struct __stat64 *buf)
{
syscall_printf ("entering");
return stat_worker (name, buf, 0);
}
extern "C" int
_stat64_r (struct _reent *ptr, const char *name, struct __stat64 *buf)
{
int ret;
set_errno (0);
if ((ret = stat64 (name, buf)) == -1 && get_errno () != 0)
ptr->_errno = get_errno ();
return ret;
}
extern "C" int
stat (const char *name, struct __stat32 *buf)
{
struct __stat64 buf64;
int ret = stat64 (name, &buf64);
if (!ret)
stat64_to_stat32 (&buf64, buf);
return ret;
}
extern "C" int
_stat_r (struct _reent *ptr, const char *name, struct __stat32 *buf)
{
int ret;
set_errno (0);
if ((ret = stat (name, buf)) == -1 && get_errno () != 0)
ptr->_errno = get_errno ();
return ret;
}
/* lstat: Provided by SVR4 and 4.3+BSD, POSIX? */
extern "C" int
lstat64 (const char *name, struct __stat64 *buf)
{
syscall_printf ("entering");
return stat_worker (name, buf, 1);
}
/* lstat: Provided by SVR4 and 4.3+BSD, POSIX? */
extern "C" int
lstat (const char *name, struct __stat32 *buf)
{
struct __stat64 buf64;
int ret = lstat64 (name, &buf64);
if (!ret)
stat64_to_stat32 (&buf64, buf);
return ret;
}
extern "C" int
access (const char *fn, int flags)
{
// flags were incorrectly specified
int res = -1;
if (flags & ~(F_OK|R_OK|W_OK|X_OK))
set_errno (EINVAL);
else
{
fhandler_base *fh = build_fh_name (fn, NULL, PC_SYM_FOLLOW | PC_FULL, stat_suffixes);
res = fh->fhaccess (flags);
delete fh;
}
debug_printf ("returning %d", res);
return res;
}
extern "C" int
rename (const char *oldpath, const char *newpath)
{
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[CYG_MAX_PATH + 5];
if (real_old.is_lnk_symlink () && !real_new.error && !real_new.case_clash)
{
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.is_lnk_symlink ()
&& (lnk_suffix = strrchr (real_new.get_win32 (), '.')))
*lnk_suffix = '\0';
if (MoveFile (real_old, real_new))
goto done;
res = -1;
if (wincap.has_move_file_ex ())
{
if (MoveFileEx (real_old.get_win32 (), real_new.get_win32 (),
MOVEFILE_REPLACE_EXISTING))
res = 0;
}
else if (GetLastError () == ERROR_ALREADY_EXISTS
|| GetLastError () == ERROR_FILE_EXISTS)
{
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)
{
pthread_testcancel ();
if (check_null_empty_str_errno (cmdstring))
return -1;
int res;
const char* command[4];
if (cmdstring == (const char *) NULL)
return 1;
command[0] = "sh";
command[1] = "-c";
command[2] = cmdstring;
command[3] = (const char *) NULL;
if ((res = spawnvp (_P_SYSTEM, "sh", command)) == -1)
{
// when exec fails, return value should be as if shell
// executed exit (127)
res = 127;
}
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;
}
size_t
getshmlba ()
{
if (!system_info.dwAllocationGranularity)
GetSystemInfo (&system_info);
return system_info.dwAllocationGranularity;
}
static int
check_posix_perm (const char *fname, int v)
{
/* 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 (fname, (char *)alloca (strlen (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_FS)
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_auto_device ())
{
set_errno (EINVAL);
return -1;
}
return check_posix_perm (full_path, v);
}
default:
set_errno (EINVAL);
return -1;
}
}
extern "C" int
ttyname_r (int fd, char *buf, size_t buflen)
{
int ret = 0;
if (__check_null_invalid_struct (buf, buflen))
ret = EINVAL;
else
{
cygheap_fdget cfd (fd, true);
if (cfd < 0)
ret = EBADF;
else if (!cfd->is_tty ())
ret = ENOTTY;
else if (buflen < strlen (cfd->ttyname ()) + 1)
ret = ERANGE;
else
strcpy (buf, cfd->ttyname ());
}
debug_printf ("returning %d tty: %s", ret, ret ? "NULL" : buf);
return ret;
}
extern "C" char *
ttyname (int fd)
{
static char name[TTY_NAME_MAX + 1];
int ret = ttyname_r (fd, name, TTY_NAME_MAX + 1);
if (ret)
{
set_errno (ret);
return NULL;
}
return name;
}
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)
{
if (CYGWIN_VERSION_OLD_STDIO_CRLF_HANDLING)
{
syscall_printf ("fd %d: old API", fd);
return 0; /* we do it for old apps, due to getc/putc macros */
}
cygheap_fdget cfd (fd, false, false);
if (cfd < 0)
{
syscall_printf ("fd %d: not open", fd);
return 0;
}
#if 0
if (cfd->get_device () != FH_FS)
{
syscall_printf ("fd not disk file. Defaulting to binary.");
return 0;
}
#endif
if (cfd->wbinary () || cfd->rbinary ())
{
syscall_printf ("fd %d: opened as binary", fd);
return 0;
}
syscall_printf ("fd %d: defaulting to text", fd);
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)
{
syscall_printf ("improbable, but %d != %d", fileno (f), setmode_file);
return 0;
}
syscall_printf ("file was %s now %s", f->_flags & __SCLE ? "text" : "binary",
setmode_mode & O_TEXT ? "text" : "binary");
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->wbinary () && cfd->rbinary ())
res = O_BINARY;
else if (cfd->wbinset () && cfd->rbinset ())
res = O_TEXT; /* Specifically set O_TEXT */
else
res = 0;
if (!mode)
cfd->reset_to_open_binmode ();
else
cfd->set_flags ((cfd->get_flags () & ~(O_TEXT | O_BINARY)) | mode);
if (_cygwin_istext_for_stdio (fd))
setmode_mode = O_TEXT;
else
setmode_mode = O_BINARY;
setmode_file = fd;
_fwalk (_REENT, setmode_helper);
syscall_printf ("(%d<%s>, %p) returning %s", fd, cfd->get_name (),
mode, res & O_TEXT ? "text" : "binary");
return res;
}
extern "C" int
ftruncate64 (int fd, _off64_t length)
{
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 */
_off64_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, SEEK_SET);
}
}
}
syscall_printf ("%d = ftruncate (%d, %D)", res, fd, length);
return res;
}
/* ftruncate: P96 5.6.7.1 */
extern "C" int
ftruncate (int fd, _off_t length)
{
return ftruncate64 (fd, (_off64_t)length);
}
/* truncate: Provided by SVR4 and 4.3+BSD. Not part of POSIX.1 or XPG3 */
extern "C" int
truncate64 (const char *pathname, _off64_t length)
{
int fd;
int res = -1;
fd = open (pathname, O_RDWR);
if (fd == -1)
set_errno (EBADF);
else
{
res = ftruncate64 (fd, length);
close (fd);
}
syscall_printf ("%d = truncate (%s, %d)", res, pathname, 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)
{
return truncate64 (pathname, (_off64_t)length);
}
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)
{
char root[CYG_MAX_PATH];
syscall_printf ("statfs %s", fname);
if (!sfs)
{
set_errno (EFAULT);
return -1;
}
path_conv full_path (fname, PC_SYM_FOLLOW | PC_FULL);
if (!rootdir (full_path, root))
return -1;
/* GetDiskFreeSpaceEx must be called before GetDiskFreeSpace on
WinME, to avoid the MS KB 314417 bug */
ULARGE_INTEGER availb, freeb, totalb;
BOOL status = GetDiskFreeSpaceEx (root, &availb, &totalb, &freeb);
DWORD spc, bps, availc, freec, totalc;
if (!GetDiskFreeSpace (root, &spc, &bps, &freec, &totalc))
{
__seterrno ();
return -1;
}
if (status)
{
availc = availb.QuadPart / (spc*bps);
totalc = totalb.QuadPart / (spc*bps);
freec = freeb.QuadPart / (spc*bps);
}
else
availc = freec;
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_bavail = availc;
sfs->f_bfree = 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)
{
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)
{
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, PID_MAP_RW);
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)
{
if (pid == 0)
pid = getpid ();
pinfo p (pid);
if (p == 0)
{
set_errno (ESRCH);
return -1;
}
return p->pgid;
}
extern "C" int
setpgrp (void)
{
return setpgid (0, 0);
}
extern "C" pid_t
getpgrp (void)
{
return getpgid (0);
}
extern "C" char *
ptsname (int fd)
{
cygheap_fdget cfd (fd);
if (cfd < 0)
return 0;
return (char *) (cfd->ptsname ());
}
/* FIXME: what is this? */
extern "C" int __declspec(dllexport)
regfree ()
{
return 0;
}
static int __stdcall
mknod_worker (const char *path, mode_t type, mode_t mode, _major_t major,
_minor_t minor)
{
char buf[sizeof (":\\00000000:00000000:00000000") + CYG_MAX_PATH];
sprintf (buf, ":\\%x:%x:%x", major, minor,
type | (mode & (S_IRWXU | S_IRWXG | S_IRWXO)));
return symlink_worker (buf, path, true, true);
}
extern "C" int
mknod32 (const char *path, mode_t mode, __dev32_t dev)
{
if (check_null_empty_str_errno (path))
return -1;
if (strlen (path) >= CYG_MAX_PATH)
return -1;
path_conv w32path (path, PC_SYM_NOFOLLOW | PC_FULL);
if (w32path.exists ())
{
set_errno (EEXIST);
return -1;
}
mode_t type = mode & S_IFMT;
_major_t major = _major (dev);
_minor_t minor = _minor (dev);
switch (type)
{
case S_IFCHR:
case S_IFBLK:
break;
case S_IFIFO:
major = _major (FH_FIFO);
minor = _minor (FH_FIFO);
break;
case 0:
case S_IFREG:
{
int fd = open (path, O_CREAT, mode);
if (fd < 0)
return -1;
close (fd);
return 0;
}
default:
set_errno (EINVAL);
return -1;
}
return mknod_worker (w32path, type, mode, major, minor);
}
extern "C" int
mknod (const char *_path, mode_t mode, __dev16_t dev)
{
return mknod32 (_path, mode, (__dev32_t) dev);
}
extern "C" int
mkfifo (const char *_path, mode_t mode)
{
set_errno (ENOSYS); // FIXME
return -1;
}
/* seteuid: standards? */
extern "C" int
seteuid32 (__uid32_t uid)
{
debug_printf ("uid: %u myself->gid: %u", uid, myself->gid);
if (uid == myself->uid && !cygheap->user.groups.ischanged)
{
debug_printf ("Nothing happens");
return 0;
}
cygsid usersid;
user_groups &groups = cygheap->user.groups;
HANDLE ptok, new_token = INVALID_HANDLE_VALUE;
struct passwd * pw_new;
bool token_is_internal, issamesid;
char dacl_buf[MAX_DACL_LEN (5)];
TOKEN_DEFAULT_DACL tdacl = {};
pw_new = internal_getpwuid (uid);
if (!wincap.has_security () && pw_new)
goto success_9x;
if (!usersid.getfrompw (pw_new))
{
set_errno (EINVAL);
return -1;
}
RevertToSelf ();
if (!OpenProcessToken (hMainProc, TOKEN_QUERY | TOKEN_ADJUST_DEFAULT, &ptok))
{
__seterrno ();
goto failed_ptok;;
}
/* Verify if the process token is suitable. */
if (verify_token (ptok, usersid, groups))
new_token = ptok;
/* Verify if the external token is suitable */
else if (cygheap->user.external_token != INVALID_HANDLE_VALUE
&& verify_token (cygheap->user.external_token, usersid, groups))
new_token = cygheap->user.external_token;
/* Verify if the current token (internal or former external) is suitable */
else if (cygheap->user.current_token != INVALID_HANDLE_VALUE
&& cygheap->user.current_token != cygheap->user.external_token
&& verify_token (cygheap->user.current_token, usersid, groups,
&token_is_internal))
new_token = cygheap->user.current_token;
/* Verify if the internal token is suitable */
else if (cygheap->user.internal_token != INVALID_HANDLE_VALUE
&& cygheap->user.internal_token != cygheap->user.current_token
&& verify_token (cygheap->user.internal_token, usersid, groups,
&token_is_internal))
new_token = cygheap->user.internal_token;
debug_printf ("Found token %d", new_token);
/* Set process def dacl to allow access to impersonated token */
if (sec_acl ((PACL) dacl_buf, true, true, usersid))
{
tdacl.DefaultDacl = (PACL) dacl_buf;
if (!SetTokenInformation (ptok, TokenDefaultDacl,
&tdacl, sizeof dacl_buf))
debug_printf ("SetTokenInformation"
"(TokenDefaultDacl): %E");
}
/* If no impersonation token is available, try to
authenticate using NtCreateToken () or subauthentication. */
if (new_token == INVALID_HANDLE_VALUE)
{
new_token = create_token (usersid, groups, pw_new);
if (new_token == INVALID_HANDLE_VALUE)
{
/* create_token failed. Try subauthentication. */
debug_printf ("create token failed, try subauthentication.");
new_token = subauth (pw_new);
if (new_token == INVALID_HANDLE_VALUE)
goto failed;
}
/* Keep at most one internal token */
if (cygheap->user.internal_token != INVALID_HANDLE_VALUE)
CloseHandle (cygheap->user.internal_token);
cygheap->user.internal_token = new_token;
}
if (new_token != ptok)
{
/* Avoid having HKCU use default user */
load_registry_hive (usersid);
/* Try setting owner to same value as user. */
if (!SetTokenInformation (new_token, TokenOwner,
&usersid, sizeof usersid))
debug_printf ("SetTokenInformation(user.token, "
"TokenOwner): %E");
/* Try setting primary group in token to current group */
if (!SetTokenInformation (new_token, TokenPrimaryGroup,
&groups.pgsid, sizeof (cygsid)))
debug_printf ("SetTokenInformation(user.token, "
"TokenPrimaryGroup): %E");
/* Try setting default DACL */
if (tdacl.DefaultDacl
&& !SetTokenInformation (new_token, TokenDefaultDacl,
&tdacl, sizeof (tdacl)))
debug_printf ("SetTokenInformation (TokenDefaultDacl): %E");
}
CloseHandle (ptok);
issamesid = (usersid == cygheap->user.sid ());
cygheap->user.set_sid (usersid);
cygheap->user.current_token = new_token == ptok ? INVALID_HANDLE_VALUE
: new_token;
if (!issamesid) /* MS KB 199190 */
RegCloseKey (HKEY_CURRENT_USER);
cygheap->user.reimpersonate ();
if (!issamesid)
user_shared_initialize (true);
success_9x:
cygheap->user.set_name (pw_new->pw_name);
myself->uid = uid;
groups.ischanged = FALSE;
return 0;
failed:
CloseHandle (ptok);
failed_ptok:
cygheap->user.reimpersonate ();
return -1;
}
extern "C" int
seteuid (__uid16_t uid)
{
return seteuid32 (uid16touid32 (uid));
}
/* setuid: POSIX 4.2.2.1 */
extern "C" int
setuid32 (__uid32_t uid)
{
int ret = seteuid32 (uid);
if (!ret)
cygheap->user.real_uid = myself->uid;
debug_printf ("real: %d, effective: %d", cygheap->user.real_uid, myself->uid);
return ret;
}
extern "C" int
setuid (__uid16_t uid)
{
return setuid32 (uid16touid32 (uid));
}
extern "C" int
setreuid32 (__uid32_t ruid, __uid32_t euid)
{
int ret = 0;
bool tried = false;
__uid32_t old_euid = myself->uid;
if (ruid != ILLEGAL_UID && cygheap->user.real_uid != ruid && euid != ruid)
tried = !(ret = seteuid32 (ruid));
if (!ret && euid != ILLEGAL_UID)
ret = seteuid32 (euid);
if (tried && (ret || euid == ILLEGAL_UID) && seteuid32 (old_euid))
system_printf ("Cannot restore original euid %u", old_euid);
if (!ret && ruid != ILLEGAL_UID)
cygheap->user.real_uid = ruid;
debug_printf ("real: %u, effective: %u", cygheap->user.real_uid, myself->uid);
return ret;
}
extern "C" int
setreuid (__uid16_t ruid, __uid16_t euid)
{
return setreuid32 (uid16touid32 (ruid), uid16touid32 (euid));
}
/* setegid: from System V. */
extern "C" int
setegid32 (__gid32_t gid)
{
debug_printf ("new egid: %u current: %u", gid, myself->gid);
if (gid == myself->gid || !wincap.has_security ())
{
myself->gid = gid;
return 0;
}
user_groups * groups = &cygheap->user.groups;
cygsid gsid;
HANDLE ptok;
struct __group32 * gr = internal_getgrgid (gid);
if (!gsid.getfromgr (gr))
{
set_errno (EINVAL);
return -1;
}
myself->gid = gid;
groups->update_pgrp (gsid);
/* If impersonated, update primary group and revert */
if (cygheap->user.issetuid ())
{
if (!SetTokenInformation (cygheap->user.token (),
TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(thread, "
"TokenPrimaryGroup): %E");
RevertToSelf ();
}
if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_DEFAULT, &ptok))
debug_printf ("OpenProcessToken(): %E");
else
{
if (!SetTokenInformation (ptok, TokenPrimaryGroup,
&gsid, sizeof gsid))
debug_printf ("SetTokenInformation(process, "
"TokenPrimaryGroup): %E");
CloseHandle (ptok);
}
if (cygheap->user.issetuid ()
&& !ImpersonateLoggedOnUser (cygheap->user.token ()))
system_printf ("Impersonating in setegid failed: %E");
return 0;
}
extern "C" int
setegid (__gid16_t gid)
{
return setegid32 (gid16togid32 (gid));
}
/* setgid: POSIX 4.2.2.1 */
extern "C" int
setgid32 (__gid32_t gid)
{
int ret = setegid32 (gid);
if (!ret)
cygheap->user.real_gid = myself->gid;
return ret;
}
extern "C" int
setgid (__gid16_t gid)
{
int ret = setegid32 (gid16togid32 (gid));
if (!ret)
cygheap->user.real_gid = myself->gid;
return ret;
}
extern "C" int
setregid32 (__gid32_t rgid, __gid32_t egid)
{
int ret = 0;
bool tried = false;
__gid32_t old_egid = myself->gid;
if (rgid != ILLEGAL_GID && cygheap->user.real_gid != rgid && egid != rgid)
tried = !(ret = setegid32 (rgid));
if (!ret && egid != ILLEGAL_GID)
ret = setegid32 (egid);
if (tried && (ret || egid == ILLEGAL_GID) && setegid32 (old_egid))
system_printf ("Cannot restore original egid %u", old_egid);
if (!ret && rgid != ILLEGAL_GID)
cygheap->user.real_gid = rgid;
debug_printf ("real: %u, effective: %u", cygheap->user.real_gid, myself->gid);
return ret;
}
extern "C" int
setregid (__gid16_t rgid, __gid16_t egid)
{
return setregid32 (gid16togid32 (rgid), gid16togid32 (egid));
}
/* chroot: privileged Unix system call. */
/* FIXME: Not privileged here. How should this be done? */
extern "C" int
chroot (const char *newroot)
{
path_conv path (newroot, PC_SYM_FOLLOW | PC_FULL | PC_POSIX);
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
{
cygheap->root.set (path.normalized_path, 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)
{
return open (path, O_WRONLY | O_CREAT | O_TRUNC, mode);
}
extern "C" void
__assertfail ()
{
exit (99);
}
extern "C" int
getw (FILE *fp)
{
int w, ret;
ret = fread (&w, sizeof (int), 1, fp);
return ret != 1 ? EOF : w;
}
extern "C" int
putw (int w, FILE *fp)
{
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)
{
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;
}
static void
locked_append (int fd, const void * buf, size_t size)
{
struct __flock64 lock_buffer = {F_WRLCK, SEEK_SET, 0, 0, 0};
int count = 0;
do
if ((lock_buffer.l_start = lseek64 (fd, 0, SEEK_END)) != (_off64_t)-1
&& fcntl_worker (fd, F_SETLKW, &lock_buffer) != -1)
{
if (lseek64 (fd, 0, SEEK_END) != (_off64_t)-1)
write (fd, buf, size);
lock_buffer.l_type = F_UNLCK;
fcntl_worker (fd, F_SETLK, &lock_buffer);
break;
}
while (count++ < 1000
&& (errno == EACCES || errno == EAGAIN)
&& !usleep (1000));
}
extern "C" void
updwtmp (const char *wtmp_file, const struct utmp *ut)
{
int fd;
if ((fd = open (wtmp_file, O_WRONLY | O_BINARY, 0)) >= 0)
{
locked_append (fd, ut, sizeof *ut);
close (fd);
}
}
extern "C" void
logwtmp (const char *line, const char *user, const char *host)
{
struct utmp ut;
memset (&ut, 0, sizeof ut);
ut.ut_type = USER_PROCESS;
ut.ut_pid = getpid ();
if (line)
strncpy (ut.ut_line, line, sizeof ut.ut_line);
time (&ut.ut_time);
if (user)
strncpy (ut.ut_user, user, sizeof ut.ut_user);
if (host)
strncpy (ut.ut_host, host, sizeof ut.ut_host);
updwtmp (_PATH_WTMP, &ut);
}
extern "C" void
login (struct utmp *ut)
{
pututline (ut);
endutent ();
updwtmp (_PATH_WTMP, ut);
}
extern "C" int
logout (char *line)
{
struct utmp ut_buf, *ut;
memset (&ut_buf, 0, sizeof ut_buf);
strncpy (ut_buf.ut_line, line, sizeof ut_buf.ut_line);
setutent ();
ut = getutline (&ut_buf);
if (ut)
{
ut->ut_type = DEAD_PROCESS;
memset (ut->ut_user, 0, sizeof ut->ut_user);
memset (ut->ut_host, 0, sizeof ut->ut_host);
time (&ut->ut_time);
debug_printf ("set logout time for %s", line);
pututline (ut);
endutent ();
return 1;
}
return 0;
}
static int utmp_fd = -1;
static bool utmp_readonly = false;
static char *utmp_file = (char *) _PATH_UTMP;
static void
internal_setutent (bool force_readwrite)
{
if (force_readwrite && utmp_readonly)
endutent ();
if (utmp_fd < 0)
{
utmp_fd = open (utmp_file, O_RDWR | O_BINARY);
/* If open fails, we assume an unprivileged process (who?). In this
case we try again for reading only unless the process calls
pututline() (==force_readwrite) in which case opening just fails. */
if (utmp_fd < 0 && !force_readwrite)
{
utmp_fd = open (utmp_file, O_RDONLY | O_BINARY);
if (utmp_fd >= 0)
utmp_readonly = true;
}
}
else
lseek (utmp_fd, 0, SEEK_SET);
}
extern "C" void
setutent ()
{
internal_setutent (false);
}
extern "C" void
endutent ()
{
if (utmp_fd >= 0)
{
close (utmp_fd);
utmp_fd = -1;
utmp_readonly = false;
}
}
extern "C" void
utmpname (_CONST char *file)
{
if (check_null_empty_str (file))
{
debug_printf ("Invalid file");
return;
}
endutent ();
utmp_file = strdup (file);
debug_printf ("New UTMP file: %s", utmp_file);
}
/* Note: do not make NO_COPY */
static struct utmp utmp_data_buf[16];
static unsigned utix = 0;
#define nutdbuf (sizeof (utmp_data_buf) / sizeof (utmp_data_buf[0]))
#define utmp_data ({ \
if (utix > nutdbuf) \
utix = 0; \
utmp_data_buf + utix++; \
})
extern "C" struct utmp *
getutent ()
{
if (utmp_fd < 0)
{
internal_setutent (false);
if (utmp_fd < 0)
return NULL;
}
utmp *ut = utmp_data;
if (read (utmp_fd, ut, sizeof *ut) != sizeof *ut)
return NULL;
return ut;
}
extern "C" struct utmp *
getutid (struct utmp *id)
{
if (check_null_invalid_struct_errno (id))
return NULL;
if (utmp_fd < 0)
{
internal_setutent (false);
if (utmp_fd < 0)
return NULL;
}
utmp *ut = utmp_data;
while (read (utmp_fd, ut, sizeof *ut) == sizeof *ut)
{
switch (id->ut_type)
{
case RUN_LVL:
case BOOT_TIME:
case OLD_TIME:
case NEW_TIME:
if (id->ut_type == ut->ut_type)
return ut;
break;
case INIT_PROCESS:
case LOGIN_PROCESS:
case USER_PROCESS:
case DEAD_PROCESS:
if (strncmp (id->ut_id, ut->ut_id, UT_IDLEN) == 0)
return ut;
break;
default:
return NULL;
}
}
return NULL;
}
extern "C" struct utmp *
getutline (struct utmp *line)
{
if (check_null_invalid_struct_errno (line))
return NULL;
if (utmp_fd < 0)
{
internal_setutent (false);
if (utmp_fd < 0)
return NULL;
}
utmp *ut = utmp_data;
while (read (utmp_fd, ut, sizeof *ut) == sizeof *ut)
if ((ut->ut_type == LOGIN_PROCESS ||
ut->ut_type == USER_PROCESS) &&
!strncmp (ut->ut_line, line->ut_line, sizeof (ut->ut_line)))
return ut;
return NULL;
}
extern "C" void
pututline (struct utmp *ut)
{
if (check_null_invalid_struct (ut))
return;
internal_setutent (true);
if (utmp_fd < 0)
{
debug_printf ("error: utmp_fd %d", utmp_fd);
return;
}
debug_printf ("ut->ut_type %d, ut->ut_pid %d, ut->ut_line '%s', ut->ut_id '%s'\n",
ut->ut_type, ut->ut_pid, ut->ut_line, ut->ut_id);
debug_printf ("ut->ut_user '%s', ut->ut_host '%s'\n",
ut->ut_user, ut->ut_host);
struct utmp *u;
if ((u = getutid (ut)))
{
lseek (utmp_fd, -sizeof *ut, SEEK_CUR);
write (utmp_fd, ut, sizeof *ut);
}
else
locked_append (utmp_fd, ut, sizeof *ut);
}
extern "C"
long gethostid (void)
{
unsigned data[13] = {0x92895012,
0x10293412,
0x29602018,
0x81928167,
0x34601329,
0x75630198,
0x89860395,
0x62897564,
0x00194362,
0x20548593,
0x96839102,
0x12219854,
0x00290012};
bool has_cpuid = false;
DWORD opmask = SetThreadAffinityMask (GetCurrentThread (), 1);
if (!opmask)
debug_printf ("SetThreadAffinityMask to 1 failed, %E");
if (!can_set_flag (0x00040000))
debug_printf ("386 processor - no cpuid");
else
{
debug_printf ("486 processor");
if (can_set_flag (0x00200000))
{
debug_printf ("processor supports CPUID instruction");
has_cpuid = true;
}
else
debug_printf ("processor does not support CPUID instruction");
}
if (has_cpuid)
{
unsigned maxf, unused[3];
cpuid (&maxf, &unused[0], &unused[1], &unused[2], 0);
maxf &= 0xffff;
if (maxf >= 1)
{
unsigned features;
cpuid (&data[0], &unused[0], &unused[1], &features, 1);
if (features & (1 << 18))
{
debug_printf ("processor has psn");
if (maxf >= 3)
{
cpuid (&unused[0], &unused[1], &data[1], &data[2], 3);
debug_printf ("Processor PSN: %04x-%04x-%04x-%04x-%04x-%04x",
data[0] >> 16, data[0] & 0xffff, data[2] >> 16, data[2] & 0xffff, data[1] >> 16, data[1] & 0xffff);
}
}
else
debug_printf ("processor does not have psn");
}
}
UUID Uuid;
RPC_STATUS status = UuidCreateSequential (&Uuid);
if (GetLastError () == ERROR_PROC_NOT_FOUND)
status = UuidCreate (&Uuid);
if (status == RPC_S_OK)
{
data[4] = *(unsigned *)&Uuid.Data4[2];
data[5] = *(unsigned short *)&Uuid.Data4[6];
// Unfortunately Windows will sometimes pick a virtual Ethernet card
// e.g. VMWare Virtual Ethernet Adaptor
debug_printf ("MAC address of first Ethernet card: %02x:%02x:%02x:%02x:%02x:%02x",
Uuid.Data4[2], Uuid.Data4[3], Uuid.Data4[4],
Uuid.Data4[5], Uuid.Data4[6], Uuid.Data4[7]);
}
else
{
debug_printf ("no Ethernet card installed");
}
reg_key key (HKEY_LOCAL_MACHINE, KEY_READ, "SOFTWARE", "Microsoft", "Windows", "CurrentVersion", NULL);
key.get_string ("ProductId", (char *)&data[6], 24, "00000-000-0000000-00000");
debug_printf ("Windows Product ID: %s", (char *)&data[6]);
/* Contrary to MSDN, NT4 requires the second argument
or a STATUS_ACCESS_VIOLATION is generated */
ULARGE_INTEGER availb;
GetDiskFreeSpaceEx ("C:\\", &availb, (PULARGE_INTEGER) &data[11], NULL);
if (GetLastError () == ERROR_PROC_NOT_FOUND)
GetDiskFreeSpace ("C:\\", NULL, NULL, NULL, (DWORD *)&data[11]);
debug_printf ("hostid entropy: %08x %08x %08x %08x "
"%08x %08x %08x %08x "
"%08x %08x %08x %08x "
"%08x",
data[0], data[1],
data[2], data[3],
data[4], data[5],
data[6], data[7],
data[8], data[9],
data[10], data[11],
data[12]);
long hostid = 0x40291372;
// a random hashing algorithm
// dependancy on md5 is probably too costly
for (int i=0;i<13;i++)
hostid ^= ((data[i] << (i << 2)) | (data[i] >> (32 - (i << 2))));
if (opmask && !SetThreadAffinityMask (GetCurrentThread (), opmask))
debug_printf ("SetThreadAffinityMask to %p failed, %E", opmask);
debug_printf ("hostid: %08x", hostid);
return hostid;
}
#define ETC_SHELLS "/etc/shells"
static int shell_index;
static struct __sFILE64 *shell_fp;
extern "C" char *
getusershell ()
{
/* List of default shells if no /etc/shells exists, defined as on Linux.
FIXME: SunOS has a far longer list, containing all shells which
might be shipped with the OS. Should we do the same for the Cygwin
distro, adding bash, tcsh, ksh, pdksh and zsh? */
static NO_COPY const char *def_shells[] = {
"/bin/sh",
"/bin/csh",
"/usr/bin/sh",
"/usr/bin/csh",
NULL
};
static char buf[CYG_MAX_PATH];
int ch, buf_idx;
if (!shell_fp && !(shell_fp = fopen64 (ETC_SHELLS, "rt")))
{
if (def_shells[shell_index])
return strcpy (buf, def_shells[shell_index++]);
return NULL;
}
/* Skip white space characters. */
while ((ch = getc (shell_fp)) != EOF && isspace (ch))
;
/* Get each non-whitespace character as part of the shell path as long as
it fits in buf. */
for (buf_idx = 0;
ch != EOF && !isspace (ch) && buf_idx < CYG_MAX_PATH;
buf_idx++, ch = getc (shell_fp))
buf[buf_idx] = ch;
/* Skip any trailing non-whitespace character not fitting in buf. If the
path is longer than CYG_MAX_PATH, it's invalid anyway. */
while (ch != EOF && !isspace (ch))
ch = getc (shell_fp);
if (buf_idx)
{
buf[buf_idx] = '\0';
return buf;
}
return NULL;
}
extern "C" void
setusershell ()
{
if (shell_fp)
fseek (shell_fp, 0L, SEEK_SET);
shell_index = 0;
}
extern "C" void
endusershell ()
{
if (shell_fp)
fclose (shell_fp);
shell_index = 0;
}
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