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 * $FreeBSD$ 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 <unistd.h> 39 #include <stdio.h> 40 #include <signal.h> 41 #include <string.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 63 if (phdl == NULL) 64 return (-1); 65 66 if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t) 1, 0) != 0) 67 return (-1); 68 69 phdl->status = PS_RUN; 70 71 return (0); 72 } 73 74 int 75 proc_detach(struct proc_handle *phdl, int reason) 76 { 77 int status; 78 79 if (phdl == NULL) 80 return (EINVAL); 81 if (reason == PRELEASE_KILL) { 82 kill(phdl->pid, SIGKILL); 83 return (0); 84 } 85 if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0 && errno == ESRCH) 86 return (0); 87 if (errno == EBUSY) { 88 kill(phdl->pid, SIGSTOP); 89 waitpid(phdl->pid, &status, WUNTRACED); 90 ptrace(PT_DETACH, phdl->pid, 0, 0); 91 kill(phdl->pid, SIGCONT); 92 return (0); 93 } 94 95 return (0); 96 } 97 98 int 99 proc_getflags(struct proc_handle *phdl) 100 { 101 102 if (phdl == NULL) 103 return (-1); 104 105 return(phdl->flags); 106 } 107 108 int 109 proc_setflags(struct proc_handle *phdl, int mask) 110 { 111 112 if (phdl == NULL) 113 return (EINVAL); 114 115 phdl->flags |= mask; 116 117 return (0); 118 } 119 120 int 121 proc_state(struct proc_handle *phdl) 122 { 123 124 if (phdl == NULL) 125 return (-1); 126 127 return (phdl->status); 128 } 129 130 pid_t 131 proc_getpid(struct proc_handle *phdl) 132 { 133 134 if (phdl == NULL) 135 return (-1); 136 137 return (phdl->pid); 138 } 139 140 int 141 proc_wstatus(struct proc_handle *phdl) 142 { 143 int status; 144 145 if (phdl == NULL) 146 return (-1); 147 if (waitpid(phdl->pid, &status, WUNTRACED) < 0) { 148 if (errno != EINTR) 149 warn("waitpid"); 150 return (-1); 151 } 152 if (WIFSTOPPED(status)) 153 phdl->status = PS_STOP; 154 if (WIFEXITED(status) || WIFSIGNALED(status)) 155 phdl->status = PS_UNDEAD; 156 phdl->wstat = status; 157 158 return (phdl->status); 159 } 160 161 int 162 proc_getwstat(struct proc_handle *phdl) 163 { 164 165 if (phdl == NULL) 166 return (-1); 167 168 return (phdl->wstat); 169 } 170 171 char * 172 proc_signame(int sig, char *name, size_t namesz) 173 { 174 175 strlcpy(name, strsignal(sig), namesz); 176 177 return (name); 178 } 179 180 int 181 proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr) 182 { 183 struct ptrace_io_desc piod; 184 185 if (phdl == NULL) 186 return (-1); 187 piod.piod_op = PIOD_READ_D; 188 piod.piod_len = size; 189 piod.piod_addr = (void *)buf; 190 piod.piod_offs = (void *)addr; 191 192 if (ptrace(PT_IO, phdl->pid, (caddr_t)&piod, 0) < 0) 193 return (-1); 194 return (piod.piod_len); 195 } 196 197 const lwpstatus_t * 198 proc_getlwpstatus(struct proc_handle *phdl) 199 { 200 struct ptrace_lwpinfo lwpinfo; 201 lwpstatus_t *psp = &phdl->lwps; 202 siginfo_t *siginfo; 203 204 if (phdl == NULL) 205 return (NULL); 206 if (ptrace(PT_LWPINFO, phdl->pid, (caddr_t)&lwpinfo, 207 sizeof(lwpinfo)) < 0) 208 return (NULL); 209 siginfo = &lwpinfo.pl_siginfo; 210 if (lwpinfo.pl_event == PL_EVENT_SIGNAL && 211 (lwpinfo.pl_flags & PL_FLAG_SI) && 212 siginfo->si_signo == SIGTRAP && 213 (siginfo->si_code == TRAP_BRKPT || 214 siginfo->si_code == TRAP_TRACE)) { 215 psp->pr_why = PR_FAULTED; 216 psp->pr_what = FLTBPT; 217 } else if (lwpinfo.pl_flags & PL_FLAG_SCE) { 218 psp->pr_why = PR_SYSENTRY; 219 } else if (lwpinfo.pl_flags & PL_FLAG_SCX) { 220 psp->pr_why = PR_SYSEXIT; 221 } 222 223 return (psp); 224 } 225