1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/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 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 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 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 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 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 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 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 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 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 * 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 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 * 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