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.TH CLOCK_GETCPUCLOCKID 3 2010\-09\-10 Linux "Linux Programmer's Manual"
.SH 名前
clock_getcpuclockid \- obtain ID of a process CPU\-time clock
.SH 書式
\fB#include <time.h>\fP
.nf
.sp
\fBint clock_getcpuclockid(pid_t \fP\fIpid\fP\fB, clockid_t *\fP\fIclock_id\fP\fB);\fP
.fi
.sp
\fI\-lrt\fP でリンクする。
.sp
.ad l
.in -4n
glibc 向けの機能検査マクロの要件 (\fBfeature_test_macros\fP(7)  参照):
.in
.sp
\fBclock_getcpuclockid\fP():
.RS 4
_XOPEN_SOURCE\ >=\ 600 || _POSIX_C_SOURCE\ >=\ 200112L
.RE
.ad
.SH 説明
The \fBclock_getcpuclockid\fP()  function obtains the ID of the CPU\-time clock
of the process whose ID is \fIpid\fP, and returns it in the location pointed to
by \fIclock_id\fP.  If \fIpid\fP is zero, then the clock ID of the CPU\-time clock
of the calling process is returned.
.SH 返り値
On success, \fBclock_getcpuclockid\fP()  returns 0; on error, it returns one of
the positive error numbers listed in ERRORS.
.SH エラー
.TP 
\fBENOSYS\fP
The kernel does not support obtaining the per\-process CPU\-time clock of
another process, and \fIpid\fP does not specify the calling process.
.TP 
\fBEPERM\fP
The caller does not have permission to access the CPU\-time clock of the
process specified by \fIpid\fP.  (Specified as an optional error in
POSIX.1\-2001; does not occur on Linux unless the kernel does not support
obtaining the per\-process CPU\-time clock of another process.)
.TP 
\fBESRCH\fP
There is no process with the ID \fIpid\fP.
.SH バージョン
The \fBclock_getcpuclockid\fP()  function is available in glibc since version
2.2.
.SH 準拠
POSIX.1\-2001.
.SH 注意
Calling \fBclock_gettime\fP(2)  with the clock ID obtained by a call to
\fBclock_getcpuclockid\fP()  with a \fIpid\fP of 0, is the same as using the clock
ID \fBCLOCK_PROCESS_CPUTIME_ID\fP.
.SH 例
The example program below obtains the CPU\-time clock ID of the process whose
ID is given on the command line, and then uses \fBclock_gettime\fP(2)  to
obtain the time on that clock.  An example run is the following:
.in +4n
.nf

$\fB ./a.out 1\fP                 # Show CPU clock of init process
CPU\-time clock for PID 1 is 2.213466748 seconds
.fi
.in
.SS プログラムのソース
\&
.nf
#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>\en", 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\en",
	    argv[1], (long) ts.tv_sec, (long) ts.tv_nsec);
    exit(EXIT_SUCCESS);
}
.fi
.SH 関連項目
\fBclock_getres\fP(2), \fBtimer_create\fP(2), \fBpthread_getcpuclockid\fP(3),
\fBtime\fP(7)