=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/Makefile
---------------------------------------------------------------------
# $FreeBSD$

LIB=	proc

SRCS=				\
	proc_create.c		\
	proc_sym.c		\
	proc_util.c

INCS=	libproc.h

CFLAGS+=	-I. -I${.CURDIR}

SHLIB_MAJOR=	1

WARNS?=	6

WITHOUT_MAN=	yes

.include <bsd.lib.mk>
=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/_libproc.h
---------------------------------------------------------------------
/*-
 * 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 <sys/cdefs.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/ptrace.h>

#include "libproc.h"

struct proc_handle {
	pid_t	pid;			/* Process ID. */
	int	kq;			/* Kernel event queue ID. */
	int	flags;			/* Process flags. */
	int	status;			/* Process status (PS_*). */
};

=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/libproc.h
---------------------------------------------------------------------
/*-
 * 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.
 *
 * $FreeBSD$
 */

#ifndef	_LIBPROC_H_
#define	_LIBPROC_H_

#include <gelf.h>

struct proc_handle;

/* Values returned by proc_state(). */
#define PS_IDLE		1
#define PS_STOP		2
#define PS_RUN		3
#define PS_UNDEAD	4
#define PS_DEAD		5
#define PS_LOST		6

typedef struct prmap {
	uintptr_t	pr_vaddr;	/* Virtual address. */
} prmap_t;

/* Function prototype definitions. */
__BEGIN_DECLS

const prmap_t *proc_addr2map(struct proc_handle *, uintptr_t);
const prmap_t *proc_name2map(struct proc_handle *, const char *);
char	*proc_objname(struct proc_handle *, uintptr_t, char *, size_t);
int	proc_addr2sym(struct proc_handle *, uintptr_t, char *, size_t, GElf_Sym *);
int	proc_attach(pid_t pid, int flags, struct proc_handle **pphdl);
int	proc_continue(struct proc_handle *);
int	proc_clearflags(struct proc_handle *, int);
int	proc_create(const char *, char * const *, struct proc_handle **);
int	proc_detach(struct proc_handle *);
int	proc_getflags(struct proc_handle *);
int	proc_name2sym(struct proc_handle *, const char *, const char *, GElf_Sym *);
int	proc_setflags(struct proc_handle *, int);
int	proc_state(struct proc_handle *);
int	proc_wait(struct proc_handle *);
pid_t	proc_getpid(struct proc_handle *);
void	proc_free(struct proc_handle *);

__END_DECLS

#endif /* !_LIBPROC_H_ */
=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/proc_create.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 <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;
	struct kevent kev;
	int error = 0;
	int status;

	if (pid == 0 || pphdl == NULL)
		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;

	EV_SET(&kev, pid, EVFILT_PROC, EV_ADD | EV_ONESHOT, NOTE_EXIT,
	    0, NULL);

	if ((phdl->kq = kqueue()) == -1)
		err(1, "ERROR: cannot create kernel evet queue");

	if (kevent(phdl->kq, &kev, 1, NULL, 0, NULL) < 0)
		err(2, "ERROR: cannot monitor child process %d", pid);

	if (ptrace(PT_ATTACH, phdl->pid, NULL, 0) != 0)
		error = errno;

	/* Wait for the child process to stop. */
	else if (waitpid(pid, &status, WUNTRACED) == -1)
		err(3, "ERROR: child process %d didn't stop as expected", pid);

	/* Check for an unexpected status. */
	else if (WIFSTOPPED(status) == 0)
		err(4, "ERROR: child process %d status 0x%x", pid, status);
	else
		phdl->status = PS_STOP;

	if (error)
		proc_free(phdl);
	else
		*pphdl = phdl;

	return (error);
}

int
proc_create(const char *file, char * const *argv, struct proc_handle **pphdl)
{
	struct proc_handle *phdl;
	struct kevent kev;
	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);

	/* Fork a new process. */
	if ((pid = fork()) == -1)
		error = errno;
	else if (pid == 0) {
		/* The child expects to be traced. */
		if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
			_exit(1);

		/* 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;

		EV_SET(&kev, pid, EVFILT_PROC, EV_ADD | EV_ONESHOT, NOTE_EXIT,
		    0, NULL);

		if ((phdl->kq = kqueue()) == -1)
                	err(1, "ERROR: cannot create kernel evet queue");

        	if (kevent(phdl->kq, &kev, 1, NULL, 0, NULL) < 0)
                	err(2, "ERROR: cannot monitor child process %d", pid);

		/* Wait for the child process to stop. */
		if (waitpid(pid, &status, WUNTRACED) == -1)
                	err(3, "ERROR: child process %d didn't stop as expected", pid);

		/* Check for an unexpected status. */
		if (WIFSTOPPED(status) == 0)
                	err(4, "ERROR: child process %d status 0x%x", pid, status);
		else
			phdl->status = PS_STOP;
	}

	if (error)
		proc_free(phdl);
	else
		*pphdl = phdl;

	return (error);
}

void
proc_free(struct proc_handle *phdl)
{
	free(phdl);
}
=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/proc_sym.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>

char *
proc_objname(struct proc_handle *p, uintptr_t addr, char *objname,
    size_t objnamesz)
{
printf("%s(%d): Not implemented. p %p addr 0x%lx objname %p objnamesz %zd\n",__func__,__LINE__,p,(u_long) addr,objname,objnamesz);
	return (NULL);
}

const prmap_t *
proc_addr2map(struct proc_handle *p, uintptr_t addr)
{
printf("%s(%d): Not implemented. p %p addr 0x%lx\n",__func__,__LINE__,p,(u_long) addr);
	return (NULL);
}

int
proc_addr2sym(struct proc_handle *p, uintptr_t addr, char *name,
    size_t namesz, GElf_Sym *sym)
{
printf("%s(%d): Not implemented. p %p addr 0x%lx name %p namesz %zd sym %p\n",__func__,__LINE__,p,(u_long) addr,name,namesz,sym);
	return (0);
}

const prmap_t *
proc_name2map(struct proc_handle *p, const char *name)
{
printf("%s(%d): Not implemented. p %p name %p\n",__func__,__LINE__,p,name);
	return (NULL);
}

int
proc_name2sym(struct proc_handle *p, const char *object, const char *symbol,
    GElf_Sym *sym)
{
printf("%s(%d): Not implemented. p %p object %p symbol %p sym %p\n",__func__,__LINE__,p,object,symbol,sym);
	return (0);
}
=====================================================================
--ditto--
---------------------------------------------------------------------
New file: src/lib/libproc/proc_util.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 <errno.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <stdio.h>

int
proc_clearflags(struct proc_handle *phdl, int mask)
{
	if (phdl == NULL)
		return (EINVAL);

	phdl->flags &= ~mask;

	return (0);
}

int
proc_continue(struct proc_handle *phdl)
{
	if (phdl == NULL)
		return (EINVAL);

	if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t) 1, 0) != 0)
		return (errno);

	phdl->status = PS_RUN;

	return (0);
}

int
proc_detach(struct proc_handle *phdl)
{
	if (phdl == NULL)
		return (EINVAL);

	if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0)
		return (errno);

	return (0);
}

int
proc_getflags(struct proc_handle *phdl)
{
	if (phdl == NULL)
		return (-1);

	return(phdl->flags);
}

int
proc_setflags(struct proc_handle *phdl, int mask)
{
	if (phdl == NULL)
		return (EINVAL);

	phdl->flags |= mask;

	return (0);
}

int
proc_state(struct proc_handle *phdl)
{
	if (phdl == NULL)
		return (-1);

	return (phdl->status);
}

int
proc_wait(struct proc_handle *phdl)
{
	int status = 0;
	struct kevent kev;

	if (phdl == NULL)
		return (EINVAL);

	if (kevent(phdl->kq, NULL, 0, &kev, 1, NULL) <= 0)
		return (0);

	switch (kev.filter) {
	/* Child has exited */
	case EVFILT_PROC:  /* target has exited */
		phdl->status = PS_UNDEAD;
		break;
	default:
		break;
	}

	return (status);
}

pid_t
proc_getpid(struct proc_handle *phdl)
{
	if (phdl == NULL)
		return (-1);

	return (phdl->pid);
}