123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116 |
- /* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
- Copyright (C) 2004, 2005 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 <sysdep.h>
- #include <unistd.h>
- #include <bits/kernel-features.h>
- #include "kernel-posix-cpu-timers.h"
- #ifndef HAS_CPUCLOCK
- # define HAS_CPUCLOCK 1
- #endif
- int
- clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
- {
- #if defined(__NR_clock_getres) || defined(__NR_clock_getres_time64)
- /* 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);
- # if !(__ASSUME_POSIX_CPU_TIMERS > 0)
- extern int __libc_missing_posix_cpu_timers attribute_hidden;
- # if !(__ASSUME_POSIX_TIMERS > 0)
- extern int __libc_missing_posix_timers attribute_hidden;
- if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers)
- __libc_missing_posix_cpu_timers = 1;
- # endif
- if (!__libc_missing_posix_cpu_timers)
- # endif
- {
- INTERNAL_SYSCALL_DECL (err);
- # if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_getres_time64)
- int r = INTERNAL_SYSCALL (clock_getres_time64, err, 2, pidclock, NULL);
- # else
- int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL);
- # endif
- if (!INTERNAL_SYSCALL_ERROR_P (r, err))
- {
- *clock_id = pidclock;
- return 0;
- }
- # if !(__ASSUME_POSIX_TIMERS > 0)
- if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS)
- {
- /* The kernel doesn't support these calls at all. */
- __libc_missing_posix_timers = 1;
- __libc_missing_posix_cpu_timers = 1;
- }
- else
- # endif
- if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
- {
- # if !(__ASSUME_POSIX_CPU_TIMERS > 0)
- # if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_getres_time64)
- if (pidclock == MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
- || INTERNAL_SYSCALL_ERROR_P (INTERNAL_SYSCALL
- (clock_getres_time64, err, 2,
- MAKE_PROCESS_CPUCLOCK
- (0, CPUCLOCK_SCHED), NULL),
- err))
- # else
- if (pidclock == MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
- || INTERNAL_SYSCALL_ERROR_P (INTERNAL_SYSCALL
- (clock_getres, err, 2,
- MAKE_PROCESS_CPUCLOCK
- (0, CPUCLOCK_SCHED), NULL),
- err))
- # endif
- /* The kernel doesn't support these clocks at all. */
- __libc_missing_posix_cpu_timers = 1;
- else
- # endif
- /* The clock_getres system call checked the PID for us. */
- return ESRCH;
- }
- else
- return INTERNAL_SYSCALL_ERRNO (r, err);
- }
- #endif
- /* We don't allow any process ID but our own. */
- if (pid != 0 && pid != getpid ())
- return EPERM;
- #ifdef CLOCK_PROCESS_CPUTIME_ID
- if (HAS_CPUCLOCK)
- {
- /* Store the number. */
- *clock_id = CLOCK_PROCESS_CPUTIME_ID;
- return 0;
- }
- #endif
- /* We don't have a timer for that. */
- return ENOENT;
- }
|