diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/clock_getcpuclockid.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/clock_getcpuclockid.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/clock_getcpuclockid.c b/REORG.TODO/sysdeps/unix/sysv/linux/clock_getcpuclockid.c new file mode 100644 index 0000000000..4b1f3b67b0 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/clock_getcpuclockid.c @@ -0,0 +1,48 @@ +/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version. + Copyright (C) 2004-2017 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-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) |