sudo/compat.h

/*
 *  CU sudo version 1.6
 *  Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 1, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Please send bugs, changes, problems to sudo-bugs@courtesan.com
 *
 *  $Sudo$
 */

#ifndef _SUDO_COMPAT_H
#define _SUDO_COMPAT_H

/*
 * Macros that may be missing on some Operating Systems
 */

/* Deal with ansi stuff reasonably.  */
#ifndef  __P
#  if defined (__cplusplus) || defined (__STDC__)
#    define __P(args)		args
#  else
#    define __P(args)		()
#  endif
#endif /* __P */

/*
 * Some systems (ie ISC V/386) do not define MAXPATHLEN even in param.h
 */
#ifndef MAXPATHLEN
#  define MAXPATHLEN		1024
#endif

/*
 * Some systems do not define MAXHOSTNAMELEN.
 */
#ifndef MAXHOSTNAMELEN
#  define MAXHOSTNAMELEN	64
#endif

/*
 * 4.2BSD lacks FD_* macros (we only use FD_SET and FD_ZERO)
 */
#ifndef FD_SETSIZE
#define FD_SET(fd, fds)		((fds) -> fds_bits[0] |= (1 << (fd)))
#define FD_ZERO(fds)		((fds) -> fds_bits[0] = 0)
#endif /* !FD_SETSIZE */

/*
 * Posix versions for those without...
 */
#ifndef _S_IFMT
#  define _S_IFMT		S_IFMT
#endif /* _S_IFMT */
#ifndef _S_IFREG
#  define _S_IFREG		S_IFREG
#endif /* _S_IFREG */
#ifndef _S_IFDIR
#  define _S_IFDIR		S_IFDIR
#endif /* _S_IFDIR */
#ifndef S_ISREG
#  define S_ISREG(m)		(((m) & _S_IFMT) == _S_IFREG)
#endif /* S_ISREG */
#ifndef S_ISDIR
#  define S_ISDIR(m)		(((m) & _S_IFMT) == _S_IFDIR)
#endif /* S_ISDIR */

/*
 * Some OS's may not have this.
 */
#ifndef S_IRWXU
#  define S_IRWXU		0000700		/* rwx for owner */
#endif /* S_IRWXU */

/*
 * In case this is not defined in <sys/types.h> or <sys/select.h>
 */
#ifndef howmany
#define howmany(x, y)	(((x) + ((y) - 1)) / (y))
#endif

/*
 * These should be defined in <unistd.h> but not everyone has them.
 */
#ifndef STDIN_FILENO
#  define	STDIN_FILENO	0
#endif
#ifndef STDOUT_FILENO
#  define	STDOUT_FILENO	1
#endif
#ifndef STDERR_FILENO
#  define	STDERR_FILENO	2
#endif

/*
 * Emulate seteuid() for AIX via setuidx() -- needed for some versions of AIX
 */
#ifdef _AIX
#  include <sys/id.h>
#  define seteuid(_EUID)	(setuidx(ID_EFFECTIVE|ID_REAL, _EUID))
#  undef HAVE_SETEUID
#  define HAVE_SETEUID		1
#endif /* _AIX */

/*
 * Emulate seteuid() for HP-UX via setresuid(2) and seteuid(2) for others.
 */
#ifndef HAVE_SETEUID
#  ifdef __hpux
#    define seteuid(_EUID)	(setresuid((uid_t) -1, _EUID, (uid_t) -1))
#  else
#    define seteuid(_EUID)	(setreuid((uid_t) -1, _EUID))
#  endif /* __hpux */
#endif /* HAVE_SETEUID */

#endif /* _SUDO_COMPAT_H */