auto
 ?÷     )),	\
   ((getservbyname_r((s),(p),&(sp).sent,&(sp).sdata) == -1) ? NULL : &(sp).sent) )
# endif
# ifdef X_POSIX_THREAD_SAFE_FUNCTIONS
#  undef X_POSIX_THREAD_SAFE_FUNCTIONS
# endif

#else
/* The regular API is assumed to be MT-safe under POSIX. */
typedef int _Xgethostbynameparams; /* dummy */
typedef int _Xgetservbynameparams; /* dummy */
# define _XGethostbyname(h,hp)		gethostbyname((h))
# define _XGethostbyaddr(a,al,t,hp)	gethostbyaddr((a),(al),(t))
# define _XGetservbyname(s,p,sp)	getservbyname((s),(p))
#endif /* X_INCLUDE_NETDB_H */

#if defined(X_INCLUDE_NETDB_H) && !defined(_XOS_INCLUDED_NETDB_H)
# define _XOS_INCLUDED_NETDB_H
#endif


/***** <dirent.h> wrappers *****/

/*
 * Effective prototypes for <dirent.h> wrappers:
 *
 * #define X_INCLUDE_DIRENT_H
 * #define XOS_USE_..._LOCKING
 * #include <X11/Xos_r.h>
 *
 * typedef ... _Xreaddirparams;
 *
 * struct dirent *_XReaddir(DIR *dir_pointer, _Xreaddirparams);
 */

#if defined(X_INCLUDE_DIRENT_H) && !defined(_XOS_INCLUDED_DIRENT_H)
# include <sys/types.h>
# if !defined(X_NOT_POSIX) || defined(SYSV)
#  include <dirent.h>
# else
#  include <sys/dir.h>
#  ifndef dirent
#   define dirent direct
#  endif
# endif
# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_DIRENTAPI)
#  define XOS_USE_MTSAFE_DIRENTAPI 1
# endif
#endif

#if !defined(X_INCLUDE_DIRENT_H) || defined(_XOS_INCLUDED_DIRENT_H)
/* Do nothing. */

#elif !defined(XTHREADS) && !defined(X_FORCE_USE_MTSAFE_API)
/* Use regular, unsafe API. */
typedef int _Xreaddirparams;	/* dummy */
# define _XReaddir(d,p)	readdir(d)

#elif !defined(XOS_USE_MTSAFE_DIRENTAPI) || defined(XNO_MTSAFE_DIRENTAPI)
/* Systems with thread support but no _r API. */
typedef struct {
  struct dirent *result;
  struct dirent dir_entry;
# ifdef _POSIX_PATH_MAX
  char buf[_POSIX_PATH_MAX];
# elif defined(NAME_MAX)
  char buf[NAME_MAX];
# else
  char buf[255];
# endif
} _Xreaddirparams;

# define _XReaddir(d,p)	\
 ( (_Xos_processLock),						 \
   (((p).result = readdir((d))) ?				 \
    (memcpy(&((p).dir_entry), (p).result, (p).result->d_reclen), \
     ((p).result = &(p).dir_entry), 0) :			 \
    0),								 \
   (_Xos_processUnlock),					 \
   (p).result )

#else
typedef struct {
  struct dirent *result;
  struct dirent dir_entry;
# ifdef _POSIX_PATH_MAX
  char buf[_POSIX_PATH_MAX];
# elif defined(NAME_MAX)
  char buf[NAME_MAX];
# else
  char buf[255];
# endif
} _Xreaddirparams;

# if defined(_POSIX_THREAD_SAFE_FUNCTIONS) || defined(__APPLE__)
/* POSIX final API, returns (int)0 on success. */
#  define _XReaddir(d,p)						\
    (readdir_r((d), &((p).dir_entry), &((p).result)) ? NULL : (p).result)
# elif defined(_POSIX_REENTRANT_FUNCTIONS)
/* POSIX draft API, returns (int)0 on success. */
#  define _XReaddir(d,p)	\
    (readdir_r((d),&((p).dir_entry)) ? NULL : &((p).dir_entry))
# elif defined(SVR4)
/* Pre-POSIX API, returns non-NULL on success. */
#  define _XReaddir(d,p)	(readdir_r((d), &(p).dir_entry))
# else
/* We have no idea what is going on.  Fake it all using process locks. */
#  define _XReaddir(d,p)	\
    ( (_Xos_processLock),						\
      (((p).result = readdir((d))) ?					\
       (memcpy(&((p).dir_entry), (p).result, (p).result->d_reclen),	\
	((p).result = &(p).dir_entry), 0) :				\
       0),								\
      (_Xos_processUnlock),						\
      (p).result )
# endif
#endif /* X_INCLUDE_DIRENT_H */

#if defined(X_INCLUDE_DIRENT_H) && !defined(_XOS_INCLUDED_DIRENT_H)
# define _XOS_INCLUDED_DIRENT_H
#endif


/***** <unistd.h> wrappers *****/

/*
 * Effective prototypes for <unistd.h> wrappers:
 *
 * #define X_INCLUDE_UNISTD_H
 * #define XOS_USE_..._LOCKING
 * #include <X11/Xos_r.h>
 *
 * typedef ... _Xgetloginparams;
 * typedef ... _Xttynameparams;
 *
 * char *_XGetlogin(_Xgetloginparams);
 * char *_XTtyname(int, _Xttynameparams);
 */

#if defined(X_INCLUDE_UNISTD_H) && !defined(_XOS_INCLUDED_UNISTD_H)
/* <unistd.h> already included by <X11/Xos.h> */
# if defined(XUSE_MTSAFE_API) || defined(XUSE_MTSAFE_UNISTDAPI)
#  define XOS_USE_MTSAFE_UNISTDAPI 1
# endif
#endif

#if !defined(X_INCLUDE_UNISTD_H) || defined(_XOS_INCLUDE