proc_util.c revision 179185 
1/*-
2 * Copyright (c) 2008 John Birrell (jb@freebsd.org)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libproc/proc_util.c 179185 2008-05-22 02:09:21Z jb $
27 */
28
29#include "_libproc.h"
30#include <errno.h>
31#include <unistd.h>
32#include <sys/ptrace.h>
33#include <sys/wait.h>
34#include <stdio.h>
35
36int
37proc_clearflags(struct proc_handle *phdl, int mask)
38{
39	if (phdl == NULL)
40		return (EINVAL);
41
42	phdl->flags &= ~mask;
43
44	return (0);
45}
46
47int
48proc_continue(struct proc_handle *phdl)
49{
50	if (phdl == NULL)
51		return (EINVAL);
52
53	if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t) 1, 0) != 0)
54		return (errno);
55
56	phdl->status = PS_RUN;
57
58	return (0);
59}
60
61int
62proc_detach(struct proc_handle *phdl)
63{
64	if (phdl == NULL)
65		return (EINVAL);
66
67	if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0)
68		return (errno);
69
70	return (0);
71}
72
73int
74proc_getflags(struct proc_handle *phdl)
75{
76	if (phdl == NULL)
77		return (-1);
78
79	return(phdl->flags);
80}
81
82int
83proc_setflags(struct proc_handle *phdl, int mask)
84{
85	if (phdl == NULL)
86		return (EINVAL);
87
88	phdl->flags |= mask;
89
90	return (0);
91}
92
93int
94proc_state(struct proc_handle *phdl)
95{
96	if (phdl == NULL)
97		return (-1);
98
99	return (phdl->status);
100}
101
102int
103proc_wait(struct proc_handle *phdl)
104{
105	int status = 0;
106	struct kevent kev;
107
108	if (phdl == NULL)
109		return (EINVAL);
110
111	if (kevent(phdl->kq, NULL, 0, &kev, 1, NULL) <= 0)
112		return (0);
113
114	switch (kev.filter) {
115	/* Child has exited */
116	case EVFILT_PROC:  /* target has exited */
117		phdl->status = PS_UNDEAD;
118		break;
119	default:
120		break;
121	}
122
123	return (status);
124}
125
126pid_t
127proc_getpid(struct proc_handle *phdl)
128{
129	if (phdl == NULL)
130		return (-1);
131
132	return (phdl->pid);
133}
134