1time_t(3type) time_t(3type)
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6 time_t, suseconds_t, useconds_t - integer time
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9 Standard C library (libc)
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12 #include <time.h>
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14 typedef /* ... */ time_t;
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16 #include <sys/types.h>
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18 typedef /* ... */ suseconds_t;
19 typedef /* ... */ useconds_t;
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22 time_t Used for time in seconds. According to POSIX, it is an integer
23 type.
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25 suseconds_t
26 Used for time in microseconds. It is a signed integer type ca‐
27 pable of storing values at least in the range [-1, 1000000].
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29 useconds_t
30 Used for time in microseconds. It is an unsigned integer type
31 capable of storing values at least in the range [0, 1000000].
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34 time_t C11, POSIX.1-2008.
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36 suseconds_t
37 useconds_t
38 POSIX.1-2008.
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41 time_t C89, POSIX.1-2001.
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43 suseconds_t
44 useconds_t
45 POSIX.1-2001.
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47 <sched.h> defines time_t since POSIX.1-2008.
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49 POSIX.1-2001 defined useconds_t in <unistd.h> too.
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52 On some architectures, the width of time_t can be controlled with the
53 feature test macro _TIME_BITS.
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55 The following headers also provide time_t: <sched.h>, <sys/msg.h>,
56 <sys/select.h>, <sys/sem.h>, <sys/shm.h>, <sys/stat.h>, <sys/time.h>,
57 <sys/types.h>, and <utime.h>.
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59 The following headers also provide suseconds_t: <sys/select.h> and
60 <sys/time.h>.
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63 stime(2), time(2), ctime(3), difftime(3), usleep(3), timeval(3type)
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67Linux man-pages 6.04 2023-03-31 time_t(3type)