1 /* $OpenBSD: rthread_np.c,v 1.20 2017/09/05 02:40:54 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/param.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 38 REDIRECT_SYSCALL(sysctl); 39 40 void 41 pthread_set_name_np(pthread_t thread, const char *name) 42 { 43 strlcpy(thread->name, name, sizeof(thread->name)); 44 } 45 46 int 47 pthread_main_np(void) 48 { 49 return (!_threads_ready || 50 (TIB_GET()->tib_thread_flags & TIB_THREAD_INITIAL_STACK) ? 1 : 0); 51 } 52 53 54 /* 55 * Return stack info from the given thread. Based upon the solaris 56 * thr_stksegment function. Note that the returned ss_sp member is the 57 * *top* of the allocated stack area, unlike in sigaltstack() where 58 * it's the bottom. You'll have to ask Sun what they were thinking... 59 * 60 * This function taken from the uthread library, with the following 61 * license: 62 * PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */ 63 int 64 pthread_stackseg_np(pthread_t thread, stack_t *sinfo) 65 { 66 if (thread->stack) { 67 #ifdef MACHINE_STACK_GROWS_UP 68 sinfo->ss_sp = thread->stack->base; 69 #else 70 sinfo->ss_sp = (char *)thread->stack->base + 71 thread->stack->len; 72 #endif 73 sinfo->ss_size = thread->stack->len; 74 if (thread->stack->guardsize != 1) 75 sinfo->ss_size -= thread->stack->guardsize; 76 sinfo->ss_flags = 0; 77 return (0); 78 } else if (thread->tib->tib_thread_flags & TIB_THREAD_INITIAL_STACK) { 79 static struct _ps_strings _ps; 80 static struct rlimit rl; 81 static int gotself; 82 83 if (!_threads_ready) /* for ROUND_TO_PAGE */ 84 _rthread_init(); 85 86 if (gotself == 0) { 87 int mib[2]; 88 size_t len; 89 90 if (getrlimit(RLIMIT_STACK, &rl) != 0) 91 return (EAGAIN); 92 93 mib[0] = CTL_VM; 94 mib[1] = VM_PSSTRINGS; 95 len = sizeof(_ps); 96 if (sysctl(mib, 2, &_ps, &len, NULL, 0) != 0) 97 return (EAGAIN); 98 gotself = 1; 99 } 100 101 /* 102 * Provides a rough estimation of stack bounds. Caller 103 * likely wants to know for the purpose of inspecting call 104 * frames, but VM_PSSTRINGS points to process arguments... 105 */ 106 #ifdef MACHINE_STACK_GROWS_UP 107 sinfo->ss_sp = _ps.val; 108 #else 109 sinfo->ss_sp = (void *)ROUND_TO_PAGE((uintptr_t)_ps.val); 110 #endif 111 sinfo->ss_size = (size_t)rl.rlim_cur; 112 sinfo->ss_flags = 0; 113 return (0); 114 } 115 return (EAGAIN); 116 } 117