1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010 The FreeBSD Foundation
5 * Copyright (c) 2008 John Birrell (jb@freebsd.org)
6 * All rights reserved.
7 *
8 * Portions of this software were developed by Rui Paulo under sponsorship
9 * from the FreeBSD Foundation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/types.h>
34#include <sys/ptrace.h>
35#include <sys/wait.h>
36
37#include <err.h>
38#include <errno.h>
39#include <signal.h>
40#include <string.h>
41#include <unistd.h>
42
43#include "_libproc.h"
44
45int
46proc_clearflags(struct proc_handle *phdl, int mask)
47{
48
49	if (phdl == NULL)
50		return (EINVAL);
51
52	phdl->flags &= ~mask;
53
54	return (0);
55}
56
57/*
58 * NB: we return -1 as the Solaris libproc Psetrun() function.
59 */
60int
61proc_continue(struct proc_handle *phdl)
62{
63	int pending;
64
65	if (phdl == NULL)
66		return (-1);
67
68	if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP)
69		pending = WSTOPSIG(phdl->wstat);
70	else
71		pending = 0;
72	if (ptrace(PT_CONTINUE, proc_getpid(phdl), (caddr_t)(uintptr_t)1,
73	    pending) != 0)
74		return (-1);
75
76	phdl->status = PS_RUN;
77
78	return (0);
79}
80
81int
82proc_detach(struct proc_handle *phdl, int reason)
83{
84	int status;
85	int request;
86	pid_t pid;
87
88	if (phdl == NULL)
89		return (EINVAL);
90	if (reason == PRELEASE_HANG)
91		return (EINVAL);
92	if ((phdl->flags & PATTACH_RDONLY) != 0)
93		goto free;
94	request = (reason == PRELEASE_KILL) ? PT_KILL : PT_DETACH;
95	pid = proc_getpid(phdl);
96	if (ptrace(request, pid, 0, 0) != 0 && errno == EBUSY) {
97		kill(pid, SIGSTOP);
98		waitpid(pid, &status, WUNTRACED);
99		ptrace(request, pid, 0, 0);
100		kill(pid, SIGCONT);
101	}
102free:
103	proc_free(phdl);
104	return (0);
105}
106
107int
108proc_getflags(struct proc_handle *phdl)
109{
110
111	if (phdl == NULL)
112		return (-1);
113
114	return (phdl->flags);
115}
116
117int
118proc_setflags(struct proc_handle *phdl, int mask)
119{
120
121	if (phdl == NULL)
122		return (EINVAL);
123
124	phdl->flags |= mask;
125
126	return (0);
127}
128
129int
130proc_state(struct proc_handle *phdl)
131{
132
133	if (phdl == NULL)
134		return (-1);
135
136	return (phdl->status);
137}
138
139int
140proc_getmodel(struct proc_handle *phdl)
141{
142
143	if (phdl == NULL)
144		return (-1);
145
146	return (phdl->model);
147}
148
149int
150proc_wstatus(struct proc_handle *phdl)
151{
152	int status;
153
154	if (phdl == NULL)
155		return (-1);
156	if (waitpid(proc_getpid(phdl), &status, WUNTRACED) < 0) {
157		if (errno != EINTR)
158			DPRINTF("waitpid");
159		return (-1);
160	}
161	if (WIFSTOPPED(status))
162		phdl->status = PS_STOP;
163	if (WIFEXITED(status) || WIFSIGNALED(status))
164		phdl->status = PS_UNDEAD;
165	phdl->wstat = status;
166
167	return (phdl->status);
168}
169
170int
171proc_getwstat(struct proc_handle *phdl)
172{
173
174	if (phdl == NULL)
175		return (-1);
176
177	return (phdl->wstat);
178}
179
180char *
181proc_signame(int sig, char *name, size_t namesz)
182{
183
184	strlcpy(name, strsignal(sig), namesz);
185
186	return (name);
187}
188
189int
190proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr)
191{
192	struct ptrace_io_desc piod;
193
194	if (phdl == NULL)
195		return (-1);
196	piod.piod_op = PIOD_READ_D;
197	piod.piod_len = size;
198	piod.piod_addr = (void *)buf;
199	piod.piod_offs = (void *)addr;
200
201	if (ptrace(PT_IO, proc_getpid(phdl), (caddr_t)&piod, 0) < 0)
202		return (-1);
203	return (piod.piod_len);
204}
205
206const lwpstatus_t *
207proc_getlwpstatus(struct proc_handle *phdl)
208{
209	struct ptrace_lwpinfo lwpinfo;
210	lwpstatus_t *psp = &phdl->lwps;
211	siginfo_t *siginfo;
212
213	if (phdl == NULL)
214		return (NULL);
215	if (ptrace(PT_LWPINFO, proc_getpid(phdl), (caddr_t)&lwpinfo,
216	    sizeof(lwpinfo)) < 0)
217		return (NULL);
218	siginfo = &lwpinfo.pl_siginfo;
219	if (lwpinfo.pl_event == PL_EVENT_SIGNAL &&
220	    (lwpinfo.pl_flags & PL_FLAG_SI) != 0) {
221		if (siginfo->si_signo == SIGTRAP &&
222		    (siginfo->si_code == TRAP_BRKPT ||
223		    siginfo->si_code == TRAP_TRACE)) {
224			psp->pr_why = PR_FAULTED;
225			psp->pr_what = FLTBPT;
226		} else {
227			psp->pr_why = PR_SIGNALLED;
228			psp->pr_what = siginfo->si_signo;
229		}
230	} else if (lwpinfo.pl_flags & PL_FLAG_SCE) {
231		psp->pr_why = PR_SYSENTRY;
232	} else if (lwpinfo.pl_flags & PL_FLAG_SCX) {
233		psp->pr_why = PR_SYSEXIT;
234	}
235
236	return (psp);
237}
238