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
|
#ifndef _PRINT_C_ /* -*- linux-c -*- */
#define _PRINT_C_
#include <linux/config.h>
#include "io.c"
/** @file print.c
* @addtogroup print Print Buffer
* Print Buffer Functions.
* The print buffer is for collecting output to send to the user daemon.
* This is a per-cpu static buffer. The buffer is sent when
* _stp_print_flush() is called.
*
* The reason to do this is to allow multiple small prints to be combined then
* timestamped and sent together to stpd. This is more efficient than sending
* numerous small packets.
*
* This function is called automatically when the print buffer is full.
* It MUST also be called at the end of every probe that prints something.
* @{
*/
static int _stp_pbuf_len[NR_CPUS];
#ifdef STP_NETLINK_ONLY
#define STP_PRINT_BUF_START 0
/** Size of buffer, not including terminating NULL */
#ifndef STP_PRINT_BUF_LEN
#define STP_PRINT_BUF_LEN 8191
#endif
static char _stp_pbuf[NR_CPUS][STP_PRINT_BUF_LEN + 1];
void _stp_print_flush (void)
{
int cpu = smp_processor_id();
char *buf = &_stp_pbuf[cpu][0];
int len = _stp_pbuf_len[cpu];
int ret;
if (len == 0)
return;
ret =_stp_transport_write(t, buf, len + 1);
if (unlikely(ret < 0))
atomic_inc (&_stp_transport_failures);
_stp_pbuf_len[cpu] = 0;
*buf = 0;
}
#else /* ! STP_NETLINK_ONLY */
/* size of timestamp, in bytes, including space */
#define TIMESTAMP_SIZE 19
#define STP_PRINT_BUF_START (TIMESTAMP_SIZE + 1)
/** Size of buffer, not including terminating NULL */
#ifndef STP_PRINT_BUF_LEN
#define STP_PRINT_BUF_LEN (8192 - TIMESTAMP_SIZE - 2)
#endif
static char _stp_pbuf[NR_CPUS][STP_PRINT_BUF_LEN + STP_PRINT_BUF_START + 1];
/** Send the print buffer to the transport now.
* Output accumulates in the print buffer until it
* is filled, or this is called. This MUST be called before returning
* from a probe or accumulated output in the print buffer will be lost.
*/
void _stp_print_flush (void)
{
int cpu = smp_processor_id();
char *buf = &_stp_pbuf[cpu][0];
char *ptr = buf + STP_PRINT_BUF_START;
struct timeval tv;
if (_stp_pbuf_len[cpu] == 0)
return;
do_gettimeofday(&tv);
scnprintf (buf, TIMESTAMP_SIZE+1, "[%li.%06li] ", tv.tv_sec, tv.tv_usec);
buf[TIMESTAMP_SIZE] = ' ';
_stp_transport_write(t, buf, _stp_pbuf_len[cpu] + TIMESTAMP_SIZE + 2);
_stp_pbuf_len[cpu] = 0;
*ptr = 0;
}
#endif /* STP_NETLINK_ONLY */
/** Print into the print buffer.
* Like printf, except output goes to the print buffer.
* Safe because overflowing the buffer is not allowed.
*
* @sa _stp_print_flush()
*/
#define _stp_printf(args...) _stp_sprintf(_stp_stdout,args)
/** Print into the print buffer.
* Use this if your function already has a va_list.
* You probably want _stp_printf().
*/
#define _stp_vprintf(fmt,args) _stp_vsprintf(stdout,fmt,args)
/** Write a C string into the print buffer.
* Copies a string into a print buffer.
* Safe because overflowing the buffer is not allowed.
* This is more efficient than using _stp_printf() if you don't
* need fancy formatting.
*
* @param str A C string.
* @sa _stp_print
*/
#define _stp_print_cstr(str) _stp_string_cat_cstr(_stp_stdout,str)
/** Write a String into the print buffer.
* Copies a String into a print buffer.
* Safe because overflowing the buffer is not allowed.
* This is more efficient than using _stp_printf() if you don't
* need fancy formatting.
*
* @param str A String.
* @sa _stp_print
*/
#define _stp_print_string(str) _stp_string_cat_string(_stp_stdout,str)
/** Write a String or C string into the print buffer.
* This macro selects the proper function to call.
* @param str A String or C string (char *)
* @sa _stp_print_cstr _stp_print_string
*/
#define _stp_print(str) \
({ \
if (__builtin_types_compatible_p (typeof (str), char[])) { \
char *x = (char *)str; \
_stp_string_cat_cstr(_stp_stdout,x); \
} else { \
String x = (String)str; \
_stp_string_cat_string(_stp_stdout,x); \
} \
})
/** @} */
#endif /* _PRINT_C_ */
|
