3ded4ca51d
This is used by libdtrace to determine the data model of target processes. This allows for the creation of pid provider probes in 32-bit processes on amd64. MFC after: 1 month
241 lines
5.0 KiB
C
241 lines
5.0 KiB
C
/*-
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* Copyright (c) 2010 The FreeBSD Foundation
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* Copyright (c) 2008 John Birrell (jb@freebsd.org)
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* All rights reserved.
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*
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* Portions of this software were developed by Rui Paulo under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include "_libproc.h"
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int
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proc_clearflags(struct proc_handle *phdl, int mask)
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{
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if (phdl == NULL)
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return (EINVAL);
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phdl->flags &= ~mask;
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return (0);
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}
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/*
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* NB: we return -1 as the Solaris libproc Psetrun() function.
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*/
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int
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proc_continue(struct proc_handle *phdl)
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{
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int pending = 0;
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if (phdl == NULL)
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return (-1);
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if (phdl->status == PS_STOP && WSTOPSIG(phdl->wstat) != SIGTRAP)
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pending = WSTOPSIG(phdl->wstat);
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if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t)1, pending) != 0)
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return (-1);
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phdl->status = PS_RUN;
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return (0);
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}
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int
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proc_detach(struct proc_handle *phdl, int reason)
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{
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int status;
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if (phdl == NULL)
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return (EINVAL);
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if (reason == PRELEASE_KILL) {
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kill(phdl->pid, SIGKILL);
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return (0);
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}
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if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0 && errno == ESRCH)
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return (0);
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if (errno == EBUSY) {
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kill(phdl->pid, SIGSTOP);
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waitpid(phdl->pid, &status, WUNTRACED);
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ptrace(PT_DETACH, phdl->pid, 0, 0);
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kill(phdl->pid, SIGCONT);
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return (0);
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}
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return (0);
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}
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int
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proc_getflags(struct proc_handle *phdl)
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{
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if (phdl == NULL)
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return (-1);
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return(phdl->flags);
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}
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int
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proc_setflags(struct proc_handle *phdl, int mask)
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{
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if (phdl == NULL)
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return (EINVAL);
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phdl->flags |= mask;
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return (0);
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}
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int
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proc_state(struct proc_handle *phdl)
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{
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if (phdl == NULL)
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return (-1);
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return (phdl->status);
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}
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pid_t
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proc_getpid(struct proc_handle *phdl)
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{
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if (phdl == NULL)
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return (-1);
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return (phdl->pid);
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}
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int
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proc_getmodel(struct proc_handle *phdl)
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{
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if (phdl == NULL)
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return (-1);
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return (phdl->model);
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}
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int
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proc_wstatus(struct proc_handle *phdl)
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{
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int status;
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if (phdl == NULL)
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return (-1);
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if (waitpid(phdl->pid, &status, WUNTRACED) < 0) {
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if (errno != EINTR)
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DPRINTF("waitpid");
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return (-1);
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}
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if (WIFSTOPPED(status))
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phdl->status = PS_STOP;
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if (WIFEXITED(status) || WIFSIGNALED(status))
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phdl->status = PS_UNDEAD;
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phdl->wstat = status;
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return (phdl->status);
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}
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int
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proc_getwstat(struct proc_handle *phdl)
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{
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if (phdl == NULL)
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return (-1);
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return (phdl->wstat);
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}
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char *
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proc_signame(int sig, char *name, size_t namesz)
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{
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strlcpy(name, strsignal(sig), namesz);
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return (name);
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}
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int
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proc_read(struct proc_handle *phdl, void *buf, size_t size, size_t addr)
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{
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struct ptrace_io_desc piod;
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if (phdl == NULL)
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return (-1);
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piod.piod_op = PIOD_READ_D;
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piod.piod_len = size;
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piod.piod_addr = (void *)buf;
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piod.piod_offs = (void *)addr;
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if (ptrace(PT_IO, phdl->pid, (caddr_t)&piod, 0) < 0)
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return (-1);
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return (piod.piod_len);
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}
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const lwpstatus_t *
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proc_getlwpstatus(struct proc_handle *phdl)
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{
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struct ptrace_lwpinfo lwpinfo;
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lwpstatus_t *psp = &phdl->lwps;
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siginfo_t *siginfo;
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if (phdl == NULL)
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return (NULL);
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if (ptrace(PT_LWPINFO, phdl->pid, (caddr_t)&lwpinfo,
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sizeof(lwpinfo)) < 0)
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return (NULL);
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siginfo = &lwpinfo.pl_siginfo;
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if (lwpinfo.pl_event == PL_EVENT_SIGNAL &&
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(lwpinfo.pl_flags & PL_FLAG_SI) != 0) {
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if (siginfo->si_signo == SIGTRAP &&
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(siginfo->si_code == TRAP_BRKPT ||
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siginfo->si_code == TRAP_TRACE)) {
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psp->pr_why = PR_FAULTED;
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psp->pr_what = FLTBPT;
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} else {
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psp->pr_why = PR_SIGNALLED;
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psp->pr_what = siginfo->si_signo;
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}
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} else if (lwpinfo.pl_flags & PL_FLAG_SCE) {
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psp->pr_why = PR_SYSENTRY;
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} else if (lwpinfo.pl_flags & PL_FLAG_SCX) {
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psp->pr_why = PR_SYSEXIT;
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}
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return (psp);
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}
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