time_t(3type) - Linux manual page (original) (raw)

timet(3type) timet(3type)

NAME top

   time_t, suseconds_t, useconds_t - integer time

LIBRARY top

   Standard C library (_libc_)

SYNOPSIS top

   **#include <time.h>**

   **typedef** /* ... */  **time_t;**

   **#include <sys/types.h>**

   **typedef** /* ... */  **suseconds_t;**
   **typedef** /* ... */  **useconds_t;**

DESCRIPTION top

   _timet_ Used for time in seconds.  According to POSIX, it is an
          integer type.

   _susecondst_
          Used for time in microseconds.  It is a signed integer type
          capable of storing values at least in the range [**-1**,
          **1000000**].

   _usecondst_
          Used for time in microseconds.  It is an unsigned integer
          type capable of storing values at least in the range [**0**,
          **1000000**].

STANDARDS top

   _timet_ C11, POSIX.1-2008.

   _susecondst_
   _usecondst_
          POSIX.1-2008.

HISTORY top

   _timet_ C89, POSIX.1-2001.

   _susecondst_
   _usecondst_
          POSIX.1-2001.

   _<sched.h>_ defines _timet_ since POSIX.1-2008.

   POSIX.1-2001 defined _usecondst_ in _<unistd.h>_ too.

NOTES top

   On some architectures, the width of _timet_ can be controlled with
   the feature test macro **_TIME_BITS**.  See [feature_test_macros(7)](../man7/feature%5Ftest%5Fmacros.7.html).

   The following headers also provide _timet_: _<sched.h>_, _<sys/msg.h>_,
   _<sys/select.h>_, _<sys/sem.h>_, _<sys/shm.h>_, _<sys/stat.h>_,
   _<sys/time.h>_, _<sys/types.h>_, and _<utime.h>_.

   The following headers also provide _susecondst_: _<sys/select.h>_ and
   _<sys/time.h>_.

SEE ALSO top

   [stime(2)](../man2/stime.2.html), [time(2)](../man2/time.2.html), [ctime(3)](../man3/ctime.3.html), [difftime(3)](../man3/difftime.3.html), [usleep(3)](../man3/usleep.3.html),
   [timeval(3type)](../man3/timeval.3type.html)

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Linux man-pages 6.10 2024-05-02 timet(3type)

Pages that refer to this page:time(2), timespec(3type), timeval(3type), usleep(3), feature_test_macros(7)