개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

clock_getcpuclockid(3)

CLOCK_GETCPUCLOCKID(3)     Linux Programmer's Manual    CLOCK_GETCPUCLOCKID(3)

NAME
       clock_getcpuclockid - obtain ID of a process CPU-time clock

SYNOPSIS
       #include <time.h>

       int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);

       Link with -lrt (only for glibc versions before 2.17).

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       clock_getcpuclockid():
           _POSIX_C_SOURCE >= 200112L

DESCRIPTION
       The clock_getcpuclockid() function obtains the ID of the CPU-time clock
       of  the process whose ID is pid, and returns it in the location pointed
       to by clock_id.  If pid is zero, then the  clock  ID  of  the  CPU-time
       clock of the calling process is returned.

RETURN VALUE
       On  success,  clock_getcpuclockid() returns 0; on error, it returns one
       of the positive error numbers listed in ERRORS.

ERRORS
       ENOSYS The kernel does not support obtaining the  per-process  CPU-time
              clock  of  another process, and pid does not specify the calling
              process.

       EPERM  The caller does not have permission to access the CPU-time clock
              of the process specified by pid.   (Specified  in  POSIX.1-2001;
              does  not  occur on Linux unless the kernel does not support ob‐
              taining the per-process CPU-time clock of another process.)

       ESRCH  There is no process with the ID pid.

VERSIONS
       The clock_getcpuclockid() function is available in glibc since  version
       2.2.

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox; lbw21 lb lb  l  l  l.   Interface Attribute Value  T{
       clock_getcpuclockid() T}   Thread safety  MT-Safe

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       Calling  clock_gettime(2)  with  the  clock  ID  obtained  by a call to
       clock_getcpuclockid() with a pid of 0, is the same as using  the  clock
       ID CLOCK_PROCESS_CPUTIME_ID.

EXAMPLE
       The  example program below obtains the CPU-time clock ID of the process
       whose ID is given on the command line, and then  uses  clock_gettime(2)
       to obtain the time on that clock.  An example run is the following:

           $ ./a.out 1                 # Show CPU clock of init process
           CPU-time clock for PID 1 is 2.213466748 seconds

   Program source

       #define _XOPEN_SOURCE 600
       #include <stdio.h>
       #include <unistd.h>
       #include <stdlib.h>
       #include <time.h>

       int
       main(int argc, char *argv[])
       {
           clockid_t clockid;
           struct timespec ts;

           if (argc != 2) {
               fprintf(stderr, "%s <process-ID>\n", argv[0]);
               exit(EXIT_FAILURE);
           }

           if (clock_getcpuclockid(atoi(argv[1]), &clockid) != 0) {
               perror("clock_getcpuclockid");
               exit(EXIT_FAILURE);
           }

           if (clock_gettime(clockid, &ts) == -1) {
               perror("clock_gettime");
               exit(EXIT_FAILURE);
           }

           printf("CPU-time clock for PID %s is %ld.%09ld seconds\n",
                   argv[1], (long) ts.tv_sec, (long) ts.tv_nsec);
           exit(EXIT_SUCCESS);
       }

SEE ALSO
       clock_getres(2), timer_create(2), pthread_getcpuclockid(3), time(7)

COLOPHON
       This  page  is  part of release 5.02 of the Linux 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/.

Linux                             2019-03-06            CLOCK_GETCPUCLOCKID(3)