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
45 int
proc_clearflags(struct proc_handle * phdl,int mask)46 proc_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 */
60 int
proc_continue(struct proc_handle * phdl)61 proc_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
81 int
proc_detach(struct proc_handle * phdl,int reason)82 proc_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 }
102 free:
103 proc_free(phdl);
104 return (0);
105 }
106
107 int
proc_getflags(struct proc_handle * phdl)108 proc_getflags(struct proc_handle *phdl)
109 {
110
111 if (phdl == NULL)
112 return (-1);
113
114 return (phdl->flags);
115 }
116
117 int
proc_setflags(struct proc_handle * phdl,int mask)118 proc_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
129 int
proc_state(struct proc_handle * phdl)130 proc_state(struct proc_handle *phdl)
131 {
132
133 if (phdl == NULL)
134 return (-1);
135
136 return (phdl->status);
137 }
138
139 int
proc_getmodel(struct proc_handle * phdl)140 proc_getmodel(struct proc_handle *phdl)
141 {
142
143 if (phdl == NULL)
144 return (-1);
145
146 return (phdl->model);
147 }
148
149 int
proc_wstatus(struct proc_handle * phdl)150 proc_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
170 int
proc_getwstat(struct proc_handle * phdl)171 proc_getwstat(struct proc_handle *phdl)
172 {
173
174 if (phdl == NULL)
175 return (-1);
176
177 return (phdl->wstat);
178 }
179
180 char *
proc_signame(int sig,char * name,size_t namesz)181 proc_signame(int sig, char *name, size_t namesz)
182 {
183
184 strlcpy(name, strsignal(sig), namesz);
185
186 return (name);
187 }
188
189 int
proc_read(struct proc_handle * phdl,void * buf,size_t size,size_t addr)190 proc_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
206 const lwpstatus_t *
proc_getlwpstatus(struct proc_handle * phdl)207 proc_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