NAME

time_t, suseconds_t, useconds_t - integer time

LIBRARY

Standard C library (libc)

SYNOPSIS

#include <time.h>

typedef /* ... */  time_t;

#include <sys/types.h>

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

DESCRIPTION

time_t: Used for time in seconds. According to POSIX, it is an integer type.
suseconds_t: Used for time in microseconds. It is a signed integer type capable of storing values at least in the range [-1, 1000000].
useconds_t: Used for time in microseconds. It is an unsigned integer type capable of storing values at least in the range [0, 1000000].

STANDARDS

time_t: C11, POSIX.1-2008.
suseconds_t
useconds_t: POSIX.1-2008.

HISTORY

time_t: C89, POSIX.1-2001.
suseconds_t
useconds_t: POSIX.1-2001.

<sched.h> defines time_t since POSIX.1-2008.

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

NOTES

On some architectures, the width of time_t can be controlled with the feature test macro _TIME_BITS. See feature_test_macros(7).

The following headers also provide time_t: <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 suseconds_t: <sys/select.h> and <sys/time.h>.