time_t(3type)

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 al least in the range [-1, 1000000].

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

VERSIONS

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

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

STANDARDS
time_t: C99 and later; POSIX.1-2001 and later.
suseconds_t, useconds_t: POSIX.1-2001 and later.

NOTES
On some architectures, the width of time_t can be controlled with the feature test macro _TIME_BITS.

time_t
    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>.

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

SEE ALSO
stime(2), time(2), ctime(3), difftime(3), usleep(3), timeval(3type)