1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
Copyright 2024 Northern.tech AS
This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; version 3.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
To the extent this program is licensed as part of the Enterprise
versions of CFEngine, the applicable Commercial Open Source License
(COSL) may apply to this file if you as a licensee so wish it. See
included file COSL.txt.
*/
#include <cf3.defs.h>
#include <process_lib.h>
#include <process_unix_priv.h>
#include <file_lib.h>
/*
* procfs.h is not 64-bit off_t clean, but the only affected structure is
* priovec, which we don't use. Hence we may work around #error in sys/procfs.h
* by lying that we are not compiling with large file support (while we do).
*/
#define _FILE_OFFSET_BITS 32
#include <procfs.h>
static bool GetProcessPsinfo(pid_t pid, psinfo_t *psinfo)
{
char filename[CF_BUFSIZE];
snprintf(filename, CF_BUFSIZE, "/proc/%d/psinfo", (int)pid);
int fd = open(filename, O_RDONLY);
if (fd == -1)
{
return false;
}
int res = FullRead(fd, psinfo, sizeof(*psinfo));
close(fd);
return res == sizeof(*psinfo);
}
time_t GetProcessStartTime(pid_t pid)
{
psinfo_t psinfo;
if (GetProcessPsinfo(pid, &psinfo))
{
return psinfo.pr_start.tv_sec;
}
else
{
return PROCESS_START_TIME_UNKNOWN;
}
}
static bool GetProcessPstatus(pid_t pid, pstatus_t *pstatus)
{
char filename[CF_BUFSIZE];
snprintf(filename, CF_BUFSIZE, "/proc/%jd/status", (intmax_t) pid);
int fd = open(filename, O_RDONLY);
if (fd == -1)
{
return false;
}
int res = FullRead(fd, pstatus, sizeof(*pstatus));
close(fd);
return res == sizeof(*pstatus);
}
ProcessState GetProcessState(pid_t pid)
{
/* This is the documented way to check for zombie process, on Solaris 9
* however I couldn't get it to work: Killing a child process and then reading
* /proc/PID/psinfo *before* reaping the dead child, resulted in
* psinfo.pr_nlwp == 1 and psinfo.pr_lwp.pr_lwpid == 1.
*/
#if 0
psinfo_t psinfo;
if (GetProcessPsinfo(pid, &psinfo))
{
if (psinfo.pr_nlwp == 0 &&
psinfo.pr_lwp.pr_lwpid == 0)
{
return PROCESS_STATE_ZOMBIE;
}
else
{
/* Then, we must read the "status" file to get
* pstatus.pr_lwp.pr_flags, because the psinfo.pr_lwp.pr_flag is
* deprecated. */
pstatus_t pstatus;
if (GetProcessPstatus(pid &pstatus))
{
if (pstatus.pr_lwp.pr_flags & PR_STOPPED)
{
return PROCESS_STATE_STOPPED;
}
else
{
return PROCESS_STATE_RUNNING;
}
}
}
}
return PROCESS_STATE_DOES_NOT_EXIST;
#endif
/* HACK WARNING: By experimentation I figured out that on Solaris 9 there
is no clear way to figure out if a process is zombie, but if the
"status" file is not there while the "psinfo" file is, then it's most
probably a zombie. */
pstatus_t pstatus;
bool success = GetProcessPstatus(pid, &pstatus);
if (!success && errno == ENOENT) /* file does not exist */
{
psinfo_t psinfo;
if (GetProcessPsinfo(pid, &psinfo))
{
/* /proc/PID/psinfo exists, /proc/PID/status does not exist */
return PROCESS_STATE_ZOMBIE;
}
else /* Neither status nor psinfo could be opened */
{
return PROCESS_STATE_DOES_NOT_EXIST;
}
}
/* Read the flags from status, since reading it from
psinfo is deprecated. */
if (success)
{
if (pstatus.pr_lwp.pr_flags & PR_STOPPED)
{
return PROCESS_STATE_STOPPED;
}
else
{
return PROCESS_STATE_RUNNING;
}
}
/* If we reach this point it's probably because /proc/PID/status couldn't
* be opened because of EPERM. We can't do anything to that process, so we
* might as well pretend it does not exist. */
return PROCESS_STATE_DOES_NOT_EXIST;
}
|
