Tips To Fix The Clock Gettime Error

August 18, 2021 By Lawrence Scanlon Off


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    I am using clock_gettime in training. I’ve tried enabling it too, but none of them work. I also added -lrt to the new compiler arguments, but I still get the same errors.

      Exception for CentOS Linux 7.2.1511 (kernel)gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)GNU ld version 20130226ldd (libc GNU) 2.17 
      gcc -o main packet.c connect.c transport.c accept.c main.c close.c util.c receive.c send.c congestion.c -Wall -g -std = c99 -lrtutil.c: In the Millis function:util.c: 42: 21: Error: storage type "t" unknown     Structure information about time;                    ^util.c: 43: 5: warning: implicit declaration involved in function "clock_gettime" [-Wimplicit-function-declaration]     clock_gettime (CLOCK_MONOTONIC_RAW, & t);    ^User. C: 43: 19: error: "CLOCK_MONOTONIC_RAW" not declared (click only in this function)     clock_gettime (CLOCK_MONOTONIC_RAW, & t);               ^ 
      CFLAGS = -Wall -g means -std = c99-lrt libraries# Must match your own list of C files unless your family creates selectivelySRC = $ (placeholder * .c)Principal: $ (SRC)    gcc -o $ ^ $ @ $ (CFLAGS) $ (LIBS) 
      #ifndef UTILS_438_H_#define UTILS_438_H_#include "const.h"#include "data.h"#include "transport.h"#include  

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  •   #include "util.h"#include #include #include  

    Thank you for allowing me to provide additional information to provide answers

    requested November 9, 2016 at 8:34 PM


    Not The Answer You Are Looking For? Check Out Other Questions Described As Compiler Errors With Gcc Libc, Or Maybe Ask Your Own Question.

      #define _POSIX_C_SOURCE 199309L 

    Glibc functional test macro requirements (see feature_test_macros (7)):

      clock_getres (), clock_gettime (), clock_settime ():          _POSIX_C_SOURCE> = 199309L 

    _POSIX_C_SOURCEDefining this macro means that header files can provide definitions for you follows:

      Value 1 indicates definitions conforming to POSIX.1-1990 and     ISO-C (1990).  Multiple or greater values ​​provide additional explanation    POSIX.2-1992.  A value of 199309L or greater provides additional definitions.     for POSIX.1b (realtime extension).  Higher Ou 199506l also reveals definitions     for POSIX.1c (child).  (Since glibc.3.3 version 2.5) 200112L is greater or greater     shows information that corresponds to a POSIX.1-2001 database     (XSI extension is possible without specification). it's worth it too     calls C95 (since Glibc 2.12) and C99 Glibc (since 2.10)     gives you access (in other words, the equivalent     Definition of _ISOC99_SOURCE).  AT · (Since 2 glibc. 10) will also benefit from 200809L or above     expands definitions conforming to POSIX.1-2008 base     Specification (except XSI extension). 

    answered Nov 11, 2016 at 20:41

    clock gettime error


    Just remove -std = c99 and repeat with -std = gnu99.This way you don’t have to add _POSIX_C_SOURCE

    answered Jan 2 ’20 only at 19:56


      CFLAGS = -g -Wall -std = c99 -D_POSIX_SOURCE -D_GNU_SOURCELDFLAGS = -lpthread -lrt 

    You may be able to compile on all Linux systems. -lrt linker and -D_POSIX_SOURCE are the most important

    answered Nov 4 ’19 at 14:30



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