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 <signal.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include "_libproc.h" 42 43 int 44 proc_clearflags(struct proc_handle *phdl, int mask) 45 { 46 47 if (phdl == NULL) 48 return (EINVAL); 49 50 phdl->flags &= ~mask; 51 52 return (0); 53 } 54 55 /* 56 * NB: we return -1 as the Solaris libproc Psetrun() function. 57 */ 58 int 59 proc_continue(struct proc_handle *phdl) 60 { 61 int pending = 0; 62 63 if (phdl == NULL) 64 return (-1); 65 66 if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP) 67 pending = WSTOPSIG(phdl->wstat); 68 if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t)1, pending) != 0) 69 return (-1); 70 71 phdl->status = PS_RUN; 72 73 return (0); 74 } 75 76 int 77 proc_detach(struct proc_handle *phdl, int reason) 78 { 79 int status; 80 81 if (phdl == NULL) 82 return (EINVAL); 83 if (reason == PRELEASE_KILL) { 84 kill(phdl->pid, SIGKILL); 85 return (0); 86 } 87 if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0 && errno == ESRCH) 88 return (0); 89 if (errno == EBUSY) { 90 kill(phdl->pid, SIGSTOP); 91 waitpid(phdl->pid, &status, WUNTRACED); 92 ptrace(PT_DETACH, phdl->pid, 0, 0); 93 kill(phdl->pid, SIGCONT); 94 return (0); 95 } 96 97 return (0); 98 } 99 100 int 101 proc_getflags(struct proc_handle *phdl) 102 { 103 104 if (phdl == NULL) 105 return (-1); 106 107 return(phdl->flags); 108 } 109 110 int 111 proc_setflags(struct proc_handle *phdl, int mask) 112 { 113 114 if (phdl == NULL) 115 return (EINVAL); 116 117 phdl->flags |= mask; 118 119 return (0); 120 } 121 122 int 123 proc_state(struct proc_handle *phdl) 124 { 125 126 if (phdl == NULL) 127 return (-1); 128 129 return (phdl->status); 130 } 131 132 pid_t 133 proc_getpid(struct proc_handle *phdl) 134 { 135 136 if (phdl == NULL) 137 return (-1); 138 139 return (phdl->pid); 140 } 141 142 int 143 proc_wstatus(struct proc_handle *phdl) 144 { 145 int status; 146 147 if (phdl == NULL) 148 return (-1); 149 if (waitpid(phdl->pid, &status, WUNTRACED) < 0) { 150 if (errno != EINTR) 151 DPRINTF("waitpid"); 152 return (-1); 153 } 154 if (WIFSTOPPED(status)) 155 phdl->status = PS_STOP; 156 if (WIFEXITED(status) || WIFSIGNALED(status)) 157 phdl->status = PS_UNDEAD; 158 phdl->wstat = status; 159 160 return (phdl->status); 161 } 162 163 int 164 proc_getwstat(struct proc_handle *phdl) 165 { 166 167 if (phdl == NULL) 168 return (-1); 169 170 return (phdl->wstat); 171 } 172 173 char * 174 proc_signame(int sig, char *name, size_t namesz) 175 { 176 177 strlcpy(name, strsignal(sig), namesz); 178 179 return (name); 180 } 181 182 int 183 proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr) 184 { 185 struct ptrace_io_desc piod; 186 187 if (phdl == NULL) 188 return (-1); 189 piod.piod_op = PIOD_READ_D; 190 piod.piod_len = size; 191 piod.piod_addr = (void *)buf; 192 piod.piod_offs = (void *)addr; 193 194 if (ptrace(PT_IO, phdl->pid, (caddr_t)&piod, 0) < 0) 195 return (-1); 196 return (piod.piod_len); 197 } 198 199 const lwpstatus_t * 200 proc_getlwpstatus(struct proc_handle *phdl) 201 { 202 struct ptrace_lwpinfo lwpinfo; 203 lwpstatus_t *psp = &phdl->lwps; 204 siginfo_t *siginfo; 205 206 if (phdl == NULL) 207 return (NULL); 208 if (ptrace(PT_LWPINFO, phdl->pid, (caddr_t)&lwpinfo, 209 sizeof(lwpinfo)) < 0) 210 return (NULL); 211 siginfo = &lwpinfo.pl_siginfo; 212 if (lwpinfo.pl_event == PL_EVENT_SIGNAL && 213 (lwpinfo.pl_flags & PL_FLAG_SI) != 0) { 214 if (siginfo->si_signo == SIGTRAP && 215 (siginfo->si_code == TRAP_BRKPT || 216 siginfo->si_code == TRAP_TRACE)) { 217 psp->pr_why = PR_FAULTED; 218 psp->pr_what = FLTBPT; 219 } else { 220 psp->pr_why = PR_SIGNALLED; 221 psp->pr_what = siginfo->si_signo; 222 } 223 } else if (lwpinfo.pl_flags & PL_FLAG_SCE) { 224 psp->pr_why = PR_SYSENTRY; 225 } else if (lwpinfo.pl_flags & PL_FLAG_SCX) { 226 psp->pr_why = PR_SYSEXIT; 227 } 228 229 return (psp); 230 } 231