1 /*- 2 * Copyright (c) 2010 The FreeBSD Foundation 3 * Copyright (c) 2008 John Birrell (jb@freebsd.org) 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Rui Paulo under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: head/lib/libproc/proc_util.c 265308 2014-05-04 03:34:32Z markj $ 31 */ 32 33 #include <sys/types.h> 34 #include <sys/ptrace.h> 35 #include <sys/wait.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <signal.h> 39 #include <stdbool.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include "_libproc.h" 43 44 int 45 proc_clearflags(struct proc_handle *phdl, int mask) 46 { 47 48 if (phdl == NULL) 49 return (EINVAL); 50 51 phdl->flags &= ~mask; 52 53 return (0); 54 } 55 56 /* 57 * NB: we return -1 as the Solaris libproc Psetrun() function. 58 */ 59 int 60 proc_continue(struct proc_handle *phdl) 61 { 62 int pending = 0; 63 64 if (phdl == NULL) 65 return (-1); 66 67 if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP) 68 pending = WSTOPSIG(phdl->wstat); 69 if (ptrace(PT_CONTINUE, phdl->pid, (void *)(uintptr_t)1, pending) != 0) 70 return (-1); 71 72 phdl->status = PS_RUN; 73 74 return (0); 75 } 76 77 int 78 proc_detach(struct proc_handle *phdl, int reason) 79 { 80 int status; 81 82 if (phdl == NULL) 83 return EINVAL; 84 if (reason == PRELEASE_KILL) { 85 ptrace(PT_DETACH, phdl->pid, (void *)(uintptr_t)1, 0); 86 kill(phdl->pid, SIGKILL); 87 return 0; 88 } 89 if (ptrace(PT_DETACH, phdl->pid, (void *)(uintptr_t)1, 0) == 0) 90 return 0; 91 92 switch (errno) { 93 case ESRCH: 94 return 0; 95 case EBUSY: 96 break; 97 default: 98 return -1; 99 } 100 101 if (kill(phdl->pid, SIGSTOP) == -1) 102 return -1; 103 104 waitpid(phdl->pid, &status, WUNTRACED); 105 106 if (ptrace(PT_DETACH, phdl->pid, (void *)(uintptr_t)1, 0) == -1) 107 return -1; 108 109 if (kill(phdl->pid, SIGCONT) == -1) 110 return -1; 111 112 return 0; 113 } 114 115 int 116 proc_getflags(struct proc_handle *phdl) 117 { 118 119 if (phdl == NULL) 120 return (-1); 121 122 return(phdl->flags); 123 } 124 125 int 126 proc_setflags(struct proc_handle *phdl, int mask) 127 { 128 129 if (phdl == NULL) 130 return (EINVAL); 131 132 phdl->flags |= mask; 133 134 return (0); 135 } 136 137 int 138 proc_state(struct proc_handle *phdl) 139 { 140 141 if (phdl == NULL) 142 return (-1); 143 144 return (phdl->status); 145 } 146 147 pid_t 148 proc_getpid(struct proc_handle *phdl) 149 { 150 151 if (phdl == NULL) 152 return (-1); 153 154 return (phdl->pid); 155 } 156 157 int 158 proc_wstatus(struct proc_handle *phdl) 159 { 160 int status; 161 162 if (phdl == NULL) 163 return (-1); 164 if (waitpid(phdl->pid, &status, WUNTRACED) < 0) { 165 if (errno != EINTR) 166 DPRINTF("waitpid"); 167 return (-1); 168 } 169 if (WIFSTOPPED(status)) 170 phdl->status = PS_STOP; 171 if (WIFEXITED(status) || WIFSIGNALED(status)) 172 phdl->status = PS_UNDEAD; 173 phdl->wstat = status; 174 175 return (phdl->status); 176 } 177 178 int 179 proc_getwstat(struct proc_handle *phdl) 180 { 181 182 if (phdl == NULL) 183 return (-1); 184 185 return (phdl->wstat); 186 } 187 188 char * 189 proc_signame(int sig, char *name, size_t namesz) 190 { 191 192 strlcpy(name, strsignal(sig), namesz); 193 194 return (name); 195 } 196 197 int 198 proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr) 199 { 200 struct ptrace_io_desc piod; 201 202 if (phdl == NULL) 203 return (-1); 204 piod.piod_op = PIOD_READ_D; 205 piod.piod_len = size; 206 piod.piod_addr = (void *)buf; 207 piod.piod_offs = (void *)addr; 208 209 if (ptrace(PT_IO, phdl->pid, (void *)&piod, 0) < 0) 210 return (-1); 211 return (piod.piod_len); 212 } 213 214 const lwpstatus_t * 215 proc_getlwpstatus(struct proc_handle *phdl) 216 { 217 struct ptrace_lwpinfo lwpinfo; 218 lwpstatus_t *psp = &phdl->lwps; 219 siginfo_t *siginfo; 220 bool have_siginfo, sysentry, sysexit; 221 222 if (phdl == NULL) 223 return (NULL); 224 lwpinfo.pl_lwpid = 0; 225 if (ptrace(PT_LWPINFO, phdl->pid, (void *)&lwpinfo, 226 sizeof(lwpinfo)) < 0) 227 return (NULL); 228 229 #ifdef PL_FLAG_SI 230 have_siginfo = (lwpinfo.pl_flags & PL_FLAG_SI) != 0; 231 sysentry = (lwpinfo.pl_flags & PL_FLAG_SCE) != 0; 232 sysexit = (lwpinfo.pl_flags & PL_FLAG_SCX) != 0; 233 #endif 234 #ifdef PT_GET_SIGINFO 235 have_siginfo = 1; 236 sysentry = 0; 237 sysexit = 0; 238 #endif 239 240 if (lwpinfo.pl_event == PL_EVENT_SIGNAL && have_siginfo) { 241 #ifdef PL_FLAG_SI 242 siginfo = &lwpinfo.pl_siginfo; 243 #endif 244 #ifdef PT_GET_SIGINFO 245 struct ptrace_siginfo si; 246 247 if (ptrace(PT_GET_SIGINFO, phdl->pid, (void *)&si, 248 sizeof(si)) < 0) 249 return (NULL); 250 251 siginfo = &si.psi_siginfo; 252 #endif 253 if (siginfo->si_signo == SIGTRAP && 254 (siginfo->si_code == TRAP_BRKPT || 255 siginfo->si_code == TRAP_TRACE)) { 256 psp->pr_why = PR_FAULTED; 257 psp->pr_what = FLTBPT; 258 } else { 259 psp->pr_why = PR_SIGNALLED; 260 psp->pr_what = siginfo->si_signo; 261 } 262 } else if (sysentry) { 263 psp->pr_why = PR_SYSENTRY; 264 } else if (sysexit) { 265 psp->pr_why = PR_SYSEXIT; 266 } 267 return (psp); 268 } 269