1 /*
2 * Copyright (c) 2024, Tenstorrent AI ULC
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <errno.h>
8 #include <time.h>
9
10 #include <zephyr/kernel.h>
11 #include <zephyr/posix/sys/times.h>
12 #include <zephyr/posix/unistd.h>
13 #include <zephyr/sys/clock.h>
14 #include <zephyr/sys/time_units.h>
15 #include <zephyr/sys/util.h>
16
getpid(void)17 pid_t getpid(void)
18 {
19 /*
20 * To maintain compatibility with some other POSIX operating systems,
21 * a PID of zero is used to indicate that the process exists in another namespace.
22 * PID zero is also used by the scheduler in some cases.
23 * PID one is usually reserved for the init process.
24 * Also note, that negative PIDs may be used by kill()
25 * to send signals to process groups in some implementations.
26 *
27 * At the moment, getpid just returns an arbitrary number >= 2
28 */
29
30 return 42;
31 }
32 #ifdef CONFIG_POSIX_MULTI_PROCESS_ALIAS_GETPID
33 FUNC_ALIAS(getpid, _getpid, pid_t);
34 #endif /* CONFIG_POSIX_MULTI_PROCESS_ALIAS_GETPID */
35
times(struct tms * buffer)36 clock_t times(struct tms *buffer)
37 {
38 int ret;
39 clock_t utime; /* user time */
40 k_thread_runtime_stats_t stats;
41
42 ret = k_thread_runtime_stats_all_get(&stats);
43 if (ret < 0) {
44 errno = -ret;
45 return (clock_t)-1;
46 }
47
48 utime = z_tmcvt(stats.total_cycles, sys_clock_hw_cycles_per_sec(), USEC_PER_SEC,
49 IS_ENABLED(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) ? false : true,
50 sizeof(clock_t) == sizeof(uint32_t), false, false);
51
52 *buffer = (struct tms){
53 .tms_utime = utime,
54 .tms_stime = 0,
55 .tms_cutime = 0,
56 .tms_cstime = 0,
57 };
58
59 return utime;
60 }
61
