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)