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<sys/types.h>(P) POSIX Programmer's Manual <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 appropriate
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 capa-
ble 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 follow-
ing 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 Technology
-- 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 .
IEEE/The Open Group 2003 <sys/types.h>(P)
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