time_t, suseconds_t, useconds_t - integer time

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].

time_t C89, POSIX.1-2001.

       suseconds_tuseconds_t
              POSIX.1-2001.

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

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

       Standard C library (libc)

       time_t, suseconds_t, useconds_t - integer time

       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>.

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

Linux man-pages 6.9.1                              2024-05-02                                      time_t(3type)

time_t C11, POSIX.1-2008.

       suseconds_tuseconds_t
              POSIX.1-2008.

#include<time.h>typedef /* ... */  time_t;#include<sys/types.h>typedef /* ... */  suseconds_t;typedef /* ... */  useconds_t;