sys_types.h

<sys/types.h>(P)					     <sys/types.h>(P)



NAME
       sys/types.h - data types

SYNOPSIS
       #include <sys/types.h>

DESCRIPTION
       The  <sys/types.h>  header  shall include definitions for at least the
       following types:

       blkcnt_t
	      Used for file block counts.

       blksize_t
	      Used for block sizes.

       clock_t
	      Used for system times in clock  ticks  or	 CLOCKS_PER_SEC;  see
	      <time.h> .

       clockid_t
	      Used for clock ID type in the clock and timer functions.

       dev_t  Used for device IDs.

       fsblkcnt_t
	      Used for file system block counts.

       fsfilcnt_t
	      Used for file system file counts.

       gid_t  Used for group IDs.

       id_t   Used as a general identifier; can be used to contain at least a
	      pid_t, uid_t, or gid_t.

       ino_t  Used for file serial numbers.

       key_t  Used for XSI interprocess communication.

       mode_t Used for some file attributes.

       nlink_t
	      Used for link counts.

       off_t  Used for file sizes.

       pid_t  Used for process IDs and process group IDs.

       pthread_attr_t
	      Used to identify a thread attribute object.

       pthread_barrier_t
	      Used to identify a barrier.

       pthread_barrierattr_t
	      Used to define a barrier attributes object.

       pthread_cond_t
	      Used for condition variables.

       pthread_condattr_t
	      Used to identify a condition attribute object.

       pthread_key_t
	      Used for thread-specific data keys.

       pthread_mutex_t
	      Used for mutexes.

       pthread_mutexattr_t
	      Used to identify a mutex attribute object.

       pthread_once_t
	      Used for dynamic package initialization.

       pthread_rwlock_t
	      Used for read-write locks.

       pthread_rwlockattr_t
	      Used for read-write lock attributes.

       pthread_spinlock_t
	      Used to identify a spin lock.

       pthread_t
	      Used to identify a thread.

       size_t Used for sizes of objects.

       ssize_t
	      Used for a count of bytes or an error indication.

       suseconds_t
	      Used for time in microseconds.

       time_t Used for time in seconds.

       timer_t
	      Used for timer ID returned by timer_create().

       trace_attr_t
	      Used to identify a trace stream attributes object.

       trace_event_id_t
	      Used to identify a trace event type.

       trace_event_set_t
	      Used to identify a trace event type set.

       trace_id_t
	      Used to identify a trace stream.

       uid_t  Used for user IDs.

       useconds_t
	      Used for time in microseconds.


       All of the types shall be defined as arithmetic types of an  appropri-
       ate length, with the following exceptions:



       key_t


       pthread_attr_t


       pthread_barrier_t
       pthread_barrierattr_t


       pthread_cond_t
       pthread_condattr_t
       pthread_key_t
       pthread_mutex_t
       pthread_mutexattr_t
       pthread_once_t
       pthread_rwlock_t
       pthread_rwlockattr_t


       pthread_spinlock_t


       trace_attr_t
       trace_event_id_t


       trace_event_set_t


       trace_id_t


       Additionally:

	* mode_t shall be an integer type.


	* nlink_t, uid_t, gid_t, and id_t shall be integer types.


	* blkcnt_t and off_t shall be signed integer types.


	* fsblkcnt_t,  fsfilcnt_t,    and  ino_t shall be defined as unsigned
	  integer types.


	* size_t shall be an unsigned integer type.


	* blksize_t, pid_t, and ssize_t shall be signed integer types.


	* time_t and clock_t shall be integer or real-floating types.


       The type ssize_t shall be capable of storing values at  least  in  the
       range  [-1, {SSIZE_MAX}].     The type useconds_t shall be an unsigned
       integer	type  capable  of  storing  values  at	least  in  the	range
       [0, 1000000].  The  type	 suseconds_t  shall  be a signed integer type
       capable of storing values at least in the range [-1, 1000000].

       The implementation shall support one or more programming	 environments
       in which the widths of blksize_t, pid_t, size_t, ssize_t, suseconds_t,
       and useconds_t are no greater than the width of type long.  The	names
       of  these programming environments can be obtained using the confstr()
       function or the getconf utility.

       There are no defined comparison or assignment operators for  the	 fol-
       lowing types:



       pthread_attr_t


       pthread_barrier_t
       pthread_barrierattr_t


       pthread_cond_t
       pthread_condattr_t
       pthread_mutex_t
       pthread_mutexattr_t
       pthread_rwlock_t
       pthread_rwlockattr_t


       pthread_spinlock_t


       trace_attr_t


       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <time.h> , the System Interfaces volume of IEEE Std 1003.1-2001, conf-
       str(), the Shell and Utilities volume of IEEE Std 1003.1-2001, getconf

COPYRIGHT
       Portions	 of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information  Technol-
       ogy  --	Portable  Operating  System Interface (POSIX), The Open Group
       Base Specifications Issue 6, Copyright (C) 2001-2003 by the  Institute
       of  Electrical  and  Electronics Engineers, Inc and The Open Group. In
       the event of any discrepancy between this  version  and	the  original
       IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard is  the	 referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



POSIX				     2003		     <sys/types.h>(P)