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
|
/* -*- linux-c -*-
*
* ctl.c - staprun control channel
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*
* Copyright (C) 2007 Red Hat Inc.
*/
#include "staprun.h"
/* This is only used in the old relayfs code */
static void read_buffer_info(void)
{
char buf[128];
struct statfs st;
int fd, len, ret;
if (!use_old_transport)
return;
if (statfs("/sys/kernel/debug", &st) == 0 && (int) st.f_type == (int) DEBUGFS_MAGIC)
return;
sprintf (buf, "/proc/systemtap/%s/bufsize", modname);
fd = open(buf, O_RDONLY);
if (fd < 0)
return;
len = read(fd, buf, sizeof(buf));
if (len <= 0) {
fprintf (stderr, "ERROR: couldn't read bufsize.\n");
close(fd);
return;
}
ret = sscanf(buf, "%u,%u", &n_subbufs, &subbuf_size);
if (ret != 2)
fprintf (stderr, "ERROR: couldn't read bufsize.\n");
dbug(2, "n_subbufs= %u, size=%u\n", n_subbufs, subbuf_size);
close(fd);
return;
}
int init_ctl_channel(void)
{
char buf[128];
struct statfs st;
if (statfs("/sys/kernel/debug", &st) == 0 && (int) st.f_type == (int) DEBUGFS_MAGIC)
sprintf (buf, "/sys/kernel/debug/systemtap/%s/cmd", modname);
else
sprintf (buf, "/proc/systemtap/%s/cmd", modname);
dbug(2, "Opening %s\n", buf);
control_channel = open(buf, O_RDWR);
if (control_channel < 0) {
if (attach_mod)
fprintf (stderr, "ERROR: Cannot connect to module \"%s\".\n", modname);
else
fprintf (stderr, "ERROR: couldn't open control channel %s\n", buf);
fprintf (stderr, "errcode = %s\n", strerror(errno));
return -1;
}
read_buffer_info();
return 0;
}
void close_ctl_channel(void)
{
if (control_channel > 0) {
close(control_channel);
control_channel = 0;
}
}
|
