timespec(3type) — Linux manual page

timespec(3type)                                           timespec(3type)

NAME         top

       timespec - time in seconds and nanoseconds

LIBRARY         top

       Standard C library (libc)

SYNOPSIS         top

       #include <time.h>

       struct timespec {
           time_t     tv_sec;   /* Seconds */
           /* ... */  tv_nsec;  /* Nanoseconds [0, 999'999'999] */
       };

DESCRIPTION         top

       Describes times in seconds and nanoseconds.

       tv_nsec is of an implementation-defined signed type capable of
       holding the specified range.  Under glibc, this is usually long,
       and long long on X32.  It can be safely down-cast to any concrete
       32-bit integer type for processing.

VERSIONS         top

       Prior to C23, tv_nsec was long.

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001.

NOTES         top

       The following headers also provide this type: <aio.h>, <mqueue.h>,
       <sched.h>, <signal.h>, <sys/select.h>, and <sys/stat.h>.

SEE ALSO         top

       clock_gettime(2), clock_nanosleep(2), nanosleep(2),
       timerfd_gettime(2), timer_gettime(2), time_t(3type),
       timeval(3type)

COLOPHON         top

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Linux man-pages 6.15            2025-05-17                timespec(3type)

Pages that refer to this page: itimerspec(3type),  timespec_get(3),  timeval(3type),  TIMEVAL_TO_TIMESPEC(3)

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