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 <stdio.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "_libproc.h" 45 46 int 47 proc_clearflags(struct proc_handle *phdl, int mask) 48 { 49 50 if (phdl == NULL) 51 return (EINVAL); 52 53 phdl->flags &= ~mask; 54 55 return (0); 56 } 57 58 /* 59 * NB: we return -1 as the Solaris libproc Psetrun() function. 60 */ 61 int 62 proc_continue(struct proc_handle *phdl) 63 { 64 int pending; 65 66 if (phdl == NULL) 67 return (-1); 68 69 if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP) 70 pending = WSTOPSIG(phdl->wstat); 71 else 72 pending = 0; 73 if (ptrace(PT_CONTINUE, proc_getpid(phdl), (caddr_t)(uintptr_t)1, 74 pending) != 0) 75 return (-1); 76 77 phdl->status = PS_RUN; 78 79 return (0); 80 } 81 82 int 83 proc_detach(struct proc_handle *phdl, int reason) 84 { 85 int status; 86 int request; 87 pid_t pid; 88 89 if (phdl == NULL) 90 return (EINVAL); 91 if (reason == PRELEASE_HANG) 92 return (EINVAL); 93 if ((phdl->flags & PATTACH_RDONLY) != 0) 94 goto free; 95 request = (reason == PRELEASE_KILL) ? PT_KILL : PT_DETACH; 96 pid = proc_getpid(phdl); 97 if (ptrace(request, pid, 0, 0) != 0 && errno == EBUSY) { 98 kill(pid, SIGSTOP); 99 waitpid(pid, &status, WUNTRACED); 100 ptrace(request, pid, 0, 0); 101 kill(pid, SIGCONT); 102 } 103 free: 104 proc_free(phdl); 105 return (0); 106 } 107 108 int 109 proc_getflags(struct proc_handle *phdl) 110 { 111 112 if (phdl == NULL) 113 return (-1); 114 115 return (phdl->flags); 116 } 117 118 int 119 proc_setflags(struct proc_handle *phdl, int mask) 120 { 121 122 if (phdl == NULL) 123 return (EINVAL); 124 125 phdl->flags |= mask; 126 127 return (0); 128 } 129 130 int 131 proc_state(struct proc_handle *phdl) 132 { 133 134 if (phdl == NULL) 135 return (-1); 136 137 return (phdl->status); 138 } 139 140 int 141 proc_getmodel(struct proc_handle *phdl) 142 { 143 144 if (phdl == NULL) 145 return (-1); 146 147 return (phdl->model); 148 } 149 150 int 151 proc_wstatus(struct proc_handle *phdl) 152 { 153 int status; 154 155 if (phdl == NULL) 156 return (-1); 157 if (waitpid(proc_getpid(phdl), &status, WUNTRACED) < 0) { 158 if (errno != EINTR) 159 DPRINTF("waitpid"); 160 return (-1); 161 } 162 if (WIFSTOPPED(status)) 163 phdl->status = PS_STOP; 164 if (WIFEXITED(status) || WIFSIGNALED(status)) 165 phdl->status = PS_UNDEAD; 166 phdl->wstat = status; 167 168 return (phdl->status); 169 } 170 171 int 172 proc_getwstat(struct proc_handle *phdl) 173 { 174 175 if (phdl == NULL) 176 return (-1); 177 178 return (phdl->wstat); 179 } 180 181 char * 182 proc_signame(int sig, char *name, size_t namesz) 183 { 184 char buf[SIG2STR_MAX]; 185 186 if (sig2str(sig, buf) == 0) 187 (void)snprintf(name, namesz, "SIG%s", buf); 188 else 189 (void)snprintf(name, namesz, "SIG#%d", sig); 190 191 return (name); 192 } 193 194 int 195 proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr) 196 { 197 struct ptrace_io_desc piod; 198 199 if (phdl == NULL) 200 return (-1); 201 piod.piod_op = PIOD_READ_D; 202 piod.piod_len = size; 203 piod.piod_addr = (void *)buf; 204 piod.piod_offs = (void *)addr; 205 206 if (ptrace(PT_IO, proc_getpid(phdl), (caddr_t)&piod, 0) < 0) 207 return (-1); 208 return (piod.piod_len); 209 } 210 211 const lwpstatus_t * 212 proc_getlwpstatus(struct proc_handle *phdl) 213 { 214 struct ptrace_lwpinfo lwpinfo; 215 lwpstatus_t *psp = &phdl->lwps; 216 siginfo_t *siginfo; 217 218 if (phdl == NULL) 219 return (NULL); 220 if (ptrace(PT_LWPINFO, proc_getpid(phdl), (caddr_t)&lwpinfo, 221 sizeof(lwpinfo)) < 0) 222 return (NULL); 223 siginfo = &lwpinfo.pl_siginfo; 224 if (lwpinfo.pl_event == PL_EVENT_SIGNAL && 225 (lwpinfo.pl_flags & PL_FLAG_SI) != 0) { 226 if (siginfo->si_signo == SIGTRAP && 227 (siginfo->si_code == TRAP_BRKPT || 228 siginfo->si_code == TRAP_TRACE)) { 229 psp->pr_why = PR_FAULTED; 230 psp->pr_what = FLTBPT; 231 } else { 232 psp->pr_why = PR_SIGNALLED; 233 psp->pr_what = siginfo->si_signo; 234 } 235 } else if (lwpinfo.pl_flags & PL_FLAG_SCE) { 236 psp->pr_why = PR_SYSENTRY; 237 } else if (lwpinfo.pl_flags & PL_FLAG_SCX) { 238 psp->pr_why = PR_SYSEXIT; 239 } 240 241 return (psp); 242 } 243