.\" Copyright (c) 2021 wharms .\" %%%LICENSE_START(VERBATIM) .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of this .\" manual under the conditions for verbatim copying, provided that the .\" entire resulting derived work is distributed under the terms of a .\" permission notice identical to this one. .\" .\" Since the Linux kernel and libraries are constantly changing, this .\" manual page may be incorrect or out-of-date. The author(s) assume no .\" responsibility for errors or omissions, or for damages resulting from .\" the use of the information contained herein. The author(s) may not .\" have taken the same level of care in the production of this manual, .\" which is licensed free of charge, as they might when working .\" professionally. .\" .\" Formatted or processed versions of this manual, if unaccompanied by .\" the source, must acknowledge the copyright and authors of this work. .\" %%%LICENSE_END .\" .ds N1 The example is simplified code and not production ready. .de N2 .SH COLOPHON This page is part of release 4.16 of the Linux .I man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at \%https://www.kernel.org/doc/man\-pages/. .. .TH timespec_get 1 "2021-04-20" Linux "User Manuals" .SH NAME timespec_get \- get time in high resolution .SH SYNOPSIS .B #include <time.h> .PP .BI "int timespec_get( struct timespec *"ts ", int " base ");" .SH DESCRIPTION The function .B timespec_get() will fill .I ts wth the current time. The argument is a .I struct timespec what is specified like: .nf struct timespec { time_t tv_sec; /* Seconds. */ long tv_nsec; /* Nanoseconds. */ }; .fi The elements of the struct hold the seconds and nanoseconds since epoch. The system clock will round the nanosecond argument. .PP The second argument .B base indicate the time base. POSIX requieres .I TIME_UTC only. All others are implementation defined. .SH RETURN VALUE The function will return .I base or 0 for failure. .SH EXAMPLE The example program will show the current time in YYYY-MM-DD hh:mm:ss and then the nanoseconds . .EX /* compile with: * gcc timespec.c -o timespec */ #include <stdio.h> #include <time.h> int main(void) { struct timespec ts; char buf[30]; timespec_get(&ts, TIME_UTC); strftime(buf, sizeof(buf), "%F %T", gmtime(&ts.tv_sec)); printf("Current time: %s ", buf); printf("UTC and %ld nsec\\n", ts.tv_nsec); return (0); } .EE \*(N1 .SH NOTE This function is equal to the POSIX function .BR "clock_gettime(CLOCK_REALTIME, ts)" . .PP The ts.tv_sec is equal to the return value of .BR time(NULL) . .SH "CONFORMING TO" The function is a C11 requirement and appears first time in .BR "glibc 2.16 " . .SH "SEE ALSO" .BR clock_gettime(3) , .BR time (2), .BR time (7) \*(N2
