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89fb683558
__clock_gettime and other __clock_* functions could result in an extra PLT reference within libc.so if it actually gets used. None of the code currently uses them, which is why this probably went unnoticed.
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
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Copyright (C) 2004-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <time.h>
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#include <unistd.h>
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#include <kernel-features.h>
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#include "kernel-posix-cpu-timers.h"
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int
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__clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
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{
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/* The clockid_t value is a simple computation from the PID.
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But we do a clock_getres call to validate it. */
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const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED);
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INTERNAL_SYSCALL_DECL (err);
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int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL);
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if (!INTERNAL_SYSCALL_ERROR_P (r, err))
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{
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*clock_id = pidclock;
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return 0;
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}
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if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
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{
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/* The clock_getres system call checked the PID for us. */
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return ESRCH;
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}
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else
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return INTERNAL_SYSCALL_ERRNO (r, err);
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}
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weak_alias (__clock_getcpuclockid, clock_getcpuclockid)
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