1/*	$OpenBSD: rthread_np.c,v 1.24 2023/01/07 05:24:58 guenther Exp $	*/
2/*
3 * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
4 * Copyright (c) 2005 Otto Moerbeek <otto@openbsd.org>
5 * All Rights Reserved.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <sys/types.h>
21#include <sys/time.h>
22#include <sys/lock.h>
23#include <sys/resource.h>
24#include <sys/queue.h>
25#include <sys/sysctl.h>
26
27#include <errno.h>
28#include <pthread.h>
29#include <pthread_np.h>
30#include <stddef.h>
31#include <stdint.h>
32#include <string.h>
33#include <tib.h>
34#include <unistd.h>
35
36#include "rthread.h"
37
38REDIRECT_SYSCALL(sysctl);
39REDIRECT_SYSCALL(getthrname);
40REDIRECT_SYSCALL(setthrname);
41
42void
43pthread_set_name_np(pthread_t thread, const char *name)
44{
45	pid_t tid = 0;
46
47	if (thread != pthread_self())
48		tid = thread->tib->tib_tid;
49	setthrname(tid, name);
50}
51
52void
53pthread_get_name_np(pthread_t thread, char *name, size_t len)
54{
55	pid_t tid = 0;
56
57	if (thread != pthread_self())
58		tid = thread->tib->tib_tid;
59	getthrname(tid, name, len);
60}
61
62int
63pthread_main_np(void)
64{
65	return (!_threads_ready ||
66	    (TIB_GET()->tib_thread_flags & TIB_THREAD_INITIAL_STACK) ? 1 : 0);
67}
68
69
70/*
71 * Return stack info from the given thread.  Based upon the solaris
72 * thr_stksegment function.  Note that the returned ss_sp member is the
73 * *top* of the allocated stack area, unlike in sigaltstack() where
74 * it's the bottom.  You'll have to ask Sun what they were thinking...
75 *
76 * This function taken from the uthread library, with the following
77 * license:
78 * PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
79int
80pthread_stackseg_np(pthread_t thread, stack_t *sinfo)
81{
82	if (thread->stack) {
83#ifdef MACHINE_STACK_GROWS_UP
84		sinfo->ss_sp = thread->stack->base;
85#else
86		sinfo->ss_sp = (char *)thread->stack->base +
87		    thread->stack->len;
88#endif
89		sinfo->ss_size = thread->stack->len;
90		if (thread->stack->guardsize != 1)
91			sinfo->ss_size -= thread->stack->guardsize;
92		sinfo->ss_flags = 0;
93		return (0);
94	} else if (thread->tib->tib_thread_flags & TIB_THREAD_INITIAL_STACK) {
95		static struct _ps_strings _ps;
96		static struct rlimit rl;
97		static int gotself;
98
99		if (!_threads_ready)		/* for ROUND_TO_PAGE */
100			_rthread_init();
101
102		if (gotself == 0) {
103			const int mib[2] = { CTL_VM, VM_PSSTRINGS };
104			size_t len;
105
106			if (getrlimit(RLIMIT_STACK, &rl) != 0)
107				return (EAGAIN);
108
109			len = sizeof(_ps);
110			if (sysctl(mib, 2, &_ps, &len, NULL, 0) != 0)
111				return (EAGAIN);
112			gotself = 1;
113		}
114
115		/*
116		 * Provides a rough estimation of stack bounds.   Caller
117		 * likely wants to know for the purpose of inspecting call
118		 * frames, but VM_PSSTRINGS points to process arguments...
119		 */
120#ifdef MACHINE_STACK_GROWS_UP
121		sinfo->ss_sp = _ps.val;
122#else
123		sinfo->ss_sp = (void *)ROUND_TO_PAGE((uintptr_t)_ps.val);
124#endif
125		sinfo->ss_size = (size_t)rl.rlim_cur;
126		sinfo->ss_flags = 0;
127		return (0);
128	}
129	return (EAGAIN);
130}
131