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 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 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 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 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 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 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 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 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 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 * 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 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 * 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