| /* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version. |
| Copyright (C) 2004-2014 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) |
