Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/sysv/linux/clock_getcpuclockid.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
49 lines (41 sloc)
1.66 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version. | |
Copyright (C) 2004-2013 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <time.h> | |
#include <unistd.h> | |
#include <kernel-features.h> | |
#include "kernel-posix-cpu-timers.h" | |
int | |
__clock_getcpuclockid (pid_t pid, clockid_t *clock_id) | |
{ | |
/* The clockid_t value is a simple computation from the PID. | |
But we do a clock_getres call to validate it. */ | |
const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED); | |
INTERNAL_SYSCALL_DECL (err); | |
int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL); | |
if (!INTERNAL_SYSCALL_ERROR_P (r, err)) | |
{ | |
*clock_id = pidclock; | |
return 0; | |
} | |
if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL) | |
{ | |
/* The clock_getres system call checked the PID for us. */ | |
return ESRCH; | |
} | |
else | |
return INTERNAL_SYSCALL_ERRNO (r, err); | |
} | |
weak_alias (__clock_getcpuclockid, clock_getcpuclockid) |