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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 usuallylong,       andlong 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 waslong.

STANDARDS        top

       C11, POSIX.1-2024.

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

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.16.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2026-01-16.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.16            2025-10-29timespec(3type)

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

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