30e81f7e3b
* Don't print any error messages to stderr unless DEBUG is defined. * Add a DPRINTFX macro for use when errno isn't set. * Print the error string from libelf when appropriate.
158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 2008 John Birrell (jb@freebsd.org)
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "_libproc.h"
|
|
#include <stdio.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/wait.h>
|
|
|
|
int
|
|
proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
|
|
{
|
|
struct proc_handle *phdl;
|
|
int error = 0;
|
|
int status;
|
|
|
|
if (pid == 0 || pid == getpid())
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Allocate memory for the process handle, a structure containing
|
|
* all things related to the process.
|
|
*/
|
|
if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
|
|
return (ENOMEM);
|
|
|
|
memset(phdl, 0, sizeof(struct proc_handle));
|
|
phdl->pid = pid;
|
|
phdl->flags = flags;
|
|
phdl->status = PS_RUN;
|
|
elf_version(EV_CURRENT);
|
|
|
|
if (ptrace(PT_ATTACH, phdl->pid, 0, 0) != 0) {
|
|
error = errno;
|
|
DPRINTF("ERROR: cannot ptrace child process %d", pid);
|
|
goto out;
|
|
}
|
|
|
|
/* Wait for the child process to stop. */
|
|
if (waitpid(pid, &status, WUNTRACED) == -1) {
|
|
error = errno;
|
|
DPRINTF("ERROR: child process %d didn't stop as expected", pid);
|
|
goto out;
|
|
}
|
|
|
|
/* Check for an unexpected status. */
|
|
if (WIFSTOPPED(status) == 0)
|
|
DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
|
|
else
|
|
phdl->status = PS_STOP;
|
|
|
|
out:
|
|
if (error)
|
|
proc_free(phdl);
|
|
else
|
|
*pphdl = phdl;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
proc_create(const char *file, char * const *argv, proc_child_func *pcf,
|
|
void *child_arg, struct proc_handle **pphdl)
|
|
{
|
|
struct proc_handle *phdl;
|
|
int error = 0;
|
|
int status;
|
|
pid_t pid;
|
|
|
|
/*
|
|
* Allocate memory for the process handle, a structure containing
|
|
* all things related to the process.
|
|
*/
|
|
if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
|
|
return (ENOMEM);
|
|
|
|
elf_version(EV_CURRENT);
|
|
|
|
/* Fork a new process. */
|
|
if ((pid = vfork()) == -1)
|
|
error = errno;
|
|
else if (pid == 0) {
|
|
/* The child expects to be traced. */
|
|
if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
|
|
_exit(1);
|
|
|
|
if (pcf != NULL)
|
|
(*pcf)(child_arg);
|
|
|
|
/* Execute the specified file: */
|
|
execvp(file, argv);
|
|
|
|
/* Couldn't execute the file. */
|
|
_exit(2);
|
|
} else {
|
|
/* The parent owns the process handle. */
|
|
memset(phdl, 0, sizeof(struct proc_handle));
|
|
phdl->pid = pid;
|
|
phdl->status = PS_IDLE;
|
|
|
|
/* Wait for the child process to stop. */
|
|
if (waitpid(pid, &status, WUNTRACED) == -1) {
|
|
error = errno;
|
|
DPRINTF("ERROR: child process %d didn't stop as expected", pid);
|
|
goto bad;
|
|
}
|
|
|
|
/* Check for an unexpected status. */
|
|
if (WIFSTOPPED(status) == 0) {
|
|
error = errno;
|
|
DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
|
|
goto bad;
|
|
} else
|
|
phdl->status = PS_STOP;
|
|
}
|
|
bad:
|
|
if (error)
|
|
proc_free(phdl);
|
|
else
|
|
*pphdl = phdl;
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
proc_free(struct proc_handle *phdl)
|
|
{
|
|
free(phdl);
|
|
}
|