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 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/ptrace.h> 36 #include <sys/wait.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <signal.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 pid_t pid; 87 88 if (phdl == NULL) 89 return (EINVAL); 90 if (reason == PRELEASE_HANG) 91 return (EINVAL); 92 if (reason == PRELEASE_KILL) { 93 kill(proc_getpid(phdl), SIGKILL); 94 goto free; 95 } 96 if ((phdl->flags & PATTACH_RDONLY) != 0) 97 goto free; 98 pid = proc_getpid(phdl); 99 if (ptrace(PT_DETACH, pid, 0, 0) != 0 && errno == ESRCH) 100 goto free; 101 if (errno == EBUSY) { 102 kill(pid, SIGSTOP); 103 waitpid(pid, &status, WUNTRACED); 104 ptrace(PT_DETACH, pid, 0, 0); 105 kill(pid, SIGCONT); 106 } 107 free: 108 proc_free(phdl); 109 return (0); 110 } 111 112 int 113 proc_getflags(struct proc_handle *phdl) 114 { 115 116 if (phdl == NULL) 117 return (-1); 118 119 return (phdl->flags); 120 } 121 122 int 123 proc_setflags(struct proc_handle *phdl, int mask) 124 { 125 126 if (phdl == NULL) 127 return (EINVAL); 128 129 phdl->flags |= mask; 130 131 return (0); 132 } 133 134 int 135 proc_state(struct proc_handle *phdl) 136 { 137 138 if (phdl == NULL) 139 return (-1); 140 141 return (phdl->status); 142 } 143 144 int 145 proc_getmodel(struct proc_handle *phdl) 146 { 147 148 if (phdl == NULL) 149 return (-1); 150 151 return (phdl->model); 152 } 153 154 int 155 proc_wstatus(struct proc_handle *phdl) 156 { 157 int status; 158 159 if (phdl == NULL) 160 return (-1); 161 if (waitpid(proc_getpid(phdl), &status, WUNTRACED) < 0) { 162 if (errno != EINTR) 163 DPRINTF("waitpid"); 164 return (-1); 165 } 166 if (WIFSTOPPED(status)) 167 phdl->status = PS_STOP; 168 if (WIFEXITED(status) || WIFSIGNALED(status)) 169 phdl->status = PS_UNDEAD; 170 phdl->wstat = status; 171 172 return (phdl->status); 173 } 174 175 int 176 proc_getwstat(struct proc_handle *phdl) 177 { 178 179 if (phdl == NULL) 180 return (-1); 181 182 return (phdl->wstat); 183 } 184 185 char * 186 proc_signame(int sig, char *name, size_t namesz) 187 { 188 189 strlcpy(name, strsignal(sig), namesz); 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