1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 The FreeBSD Foundation
5 * Copyright (c) 2008 John Birrell ([email protected])
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/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/types.h>
37 #include <sys/ptrace.h>
38 #include <sys/wait.h>
39
40 #include <err.h>
41 #include <errno.h>
42 #include <signal.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #include "_libproc.h"
47
48 int
proc_clearflags(struct proc_handle * phdl,int mask)49 proc_clearflags(struct proc_handle *phdl, int mask)
50 {
51
52 if (phdl == NULL)
53 return (EINVAL);
54
55 phdl->flags &= ~mask;
56
57 return (0);
58 }
59
60 /*
61 * NB: we return -1 as the Solaris libproc Psetrun() function.
62 */
63 int
proc_continue(struct proc_handle * phdl)64 proc_continue(struct proc_handle *phdl)
65 {
66 int pending;
67
68 if (phdl == NULL)
69 return (-1);
70
71 if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP)
72 pending = WSTOPSIG(phdl->wstat);
73 else
74 pending = 0;
75 if (ptrace(PT_CONTINUE, proc_getpid(phdl), (caddr_t)(uintptr_t)1,
76 pending) != 0)
77 return (-1);
78
79 phdl->status = PS_RUN;
80
81 return (0);
82 }
83
84 int
proc_detach(struct proc_handle * phdl,int reason)85 proc_detach(struct proc_handle *phdl, int reason)
86 {
87 int status;
88 pid_t pid;
89
90 if (phdl == NULL)
91 return (EINVAL);
92 if (reason == PRELEASE_HANG)
93 return (EINVAL);
94 if (reason == PRELEASE_KILL) {
95 kill(proc_getpid(phdl), SIGKILL);
96 goto free;
97 }
98 if ((phdl->flags & PATTACH_RDONLY) != 0)
99 goto free;
100 pid = proc_getpid(phdl);
101 if (ptrace(PT_DETACH, pid, 0, 0) != 0 && errno == ESRCH)
102 goto free;
103 if (errno == EBUSY) {
104 kill(pid, SIGSTOP);
105 waitpid(pid, &status, WUNTRACED);
106 ptrace(PT_DETACH, pid, 0, 0);
107 kill(pid, SIGCONT);
108 }
109 free:
110 proc_free(phdl);
111 return (0);
112 }
113
114 int
proc_getflags(struct proc_handle * phdl)115 proc_getflags(struct proc_handle *phdl)
116 {
117
118 if (phdl == NULL)
119 return (-1);
120
121 return (phdl->flags);
122 }
123
124 int
proc_setflags(struct proc_handle * phdl,int mask)125 proc_setflags(struct proc_handle *phdl, int mask)
126 {
127
128 if (phdl == NULL)
129 return (EINVAL);
130
131 phdl->flags |= mask;
132
133 return (0);
134 }
135
136 int
proc_state(struct proc_handle * phdl)137 proc_state(struct proc_handle *phdl)
138 {
139
140 if (phdl == NULL)
141 return (-1);
142
143 return (phdl->status);
144 }
145
146 int
proc_getmodel(struct proc_handle * phdl)147 proc_getmodel(struct proc_handle *phdl)
148 {
149
150 if (phdl == NULL)
151 return (-1);
152
153 return (phdl->model);
154 }
155
156 int
proc_wstatus(struct proc_handle * phdl)157 proc_wstatus(struct proc_handle *phdl)
158 {
159 int status;
160
161 if (phdl == NULL)
162 return (-1);
163 if (waitpid(proc_getpid(phdl), &status, WUNTRACED) < 0) {
164 if (errno != EINTR)
165 DPRINTF("waitpid");
166 return (-1);
167 }
168 if (WIFSTOPPED(status))
169 phdl->status = PS_STOP;
170 if (WIFEXITED(status) || WIFSIGNALED(status))
171 phdl->status = PS_UNDEAD;
172 phdl->wstat = status;
173
174 return (phdl->status);
175 }
176
177 int
proc_getwstat(struct proc_handle * phdl)178 proc_getwstat(struct proc_handle *phdl)
179 {
180
181 if (phdl == NULL)
182 return (-1);
183
184 return (phdl->wstat);
185 }
186
187 char *
proc_signame(int sig,char * name,size_t namesz)188 proc_signame(int sig, char *name, size_t namesz)
189 {
190
191 strlcpy(name, strsignal(sig), namesz);
192
193 return (name);
194 }
195
196 int
proc_read(struct proc_handle * phdl,void * buf,size_t size,size_t addr)197 proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr)
198 {
199 struct ptrace_io_desc piod;
200
201 if (phdl == NULL)
202 return (-1);
203 piod.piod_op = PIOD_READ_D;
204 piod.piod_len = size;
205 piod.piod_addr = (void *)buf;
206 piod.piod_offs = (void *)addr;
207
208 if (ptrace(PT_IO, proc_getpid(phdl), (caddr_t)&piod, 0) < 0)
209 return (-1);
210 return (piod.piod_len);
211 }
212
213 const lwpstatus_t *
proc_getlwpstatus(struct proc_handle * phdl)214 proc_getlwpstatus(struct proc_handle *phdl)
215 {
216 struct ptrace_lwpinfo lwpinfo;
217 lwpstatus_t *psp = &phdl->lwps;
218 siginfo_t *siginfo;
219
220 if (phdl == NULL)
221 return (NULL);
222 if (ptrace(PT_LWPINFO, proc_getpid(phdl), (caddr_t)&lwpinfo,
223 sizeof(lwpinfo)) < 0)
224 return (NULL);
225 siginfo = &lwpinfo.pl_siginfo;
226 if (lwpinfo.pl_event == PL_EVENT_SIGNAL &&
227 (lwpinfo.pl_flags & PL_FLAG_SI) != 0) {
228 if (siginfo->si_signo == SIGTRAP &&
229 (siginfo->si_code == TRAP_BRKPT ||
230 siginfo->si_code == TRAP_TRACE)) {
231 psp->pr_why = PR_FAULTED;
232 psp->pr_what = FLTBPT;
233 } else {
234 psp->pr_why = PR_SIGNALLED;
235 psp->pr_what = siginfo->si_signo;
236 }
237 } else if (lwpinfo.pl_flags & PL_FLAG_SCE) {
238 psp->pr_why = PR_SYSENTRY;
239 } else if (lwpinfo.pl_flags & PL_FLAG_SCX) {
240 psp->pr_why = PR_SYSEXIT;
241 }
242
243 return (psp);
244 }
245