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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/* $OpenBSD: utils.c,v 1.5 2017/01/03 07:25:16 ratchov Exp $ */
/*
* Copyright (c) 2003-2012 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* log_xxx() routines are used to quickly store traces into a trace buffer.
* This allows trances to be collected during time sensitive operations without
* disturbing them. The buffer can be flushed on standard error later, when
* slow syscalls are no longer disruptive, e.g. at the end of the poll() loop.
*/
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "utils.h"
/*
* log buffer size
*/
#define LOG_BUFSZ 8192
/*
* store a character in the log
*/
#define LOG_PUTC(c) do { \
if (log_used < LOG_BUFSZ) \
log_buf[log_used++] = (c); \
} while (0)
char log_buf[LOG_BUFSZ]; /* buffer where traces are stored */
unsigned int log_used = 0; /* bytes used in the buffer */
unsigned int log_sync = 1; /* if true, flush after each '\n' */
/*
* write the log buffer on stderr
*/
void
log_flush(void)
{
if (log_used == 0)
return;
write(STDERR_FILENO, log_buf, log_used);
log_used = 0;
}
/*
* store a string in the log
*/
void
log_puts(char *msg)
{
char *p = msg;
int c;
while ((c = *p++) != '\0') {
LOG_PUTC(c);
if (log_sync && c == '\n')
log_flush();
}
}
/*
* store a hex in the log
*/
void
log_putx(unsigned long num)
{
char dig[sizeof(num) * 2], *p = dig, c;
unsigned int ndig;
if (num != 0) {
for (ndig = 0; num != 0; ndig++) {
*p++ = num & 0xf;
num >>= 4;
}
for (; ndig != 0; ndig--) {
c = *(--p);
c += (c < 10) ? '0' : 'a' - 10;
LOG_PUTC(c);
}
} else
LOG_PUTC('0');
}
/*
* store an unsigned decimal in the log
*/
void
log_putu(unsigned long num)
{
char dig[sizeof(num) * 3], *p = dig;
unsigned int ndig;
if (num != 0) {
for (ndig = 0; num != 0; ndig++) {
*p++ = num % 10;
num /= 10;
}
for (; ndig != 0; ndig--)
LOG_PUTC(*(--p) + '0');
} else
LOG_PUTC('0');
}
/*
* store a signed decimal in the log
*/
void
log_puti(long num)
{
if (num < 0) {
LOG_PUTC('-');
num = -num;
}
log_putu(num);
}
/*
* abort program execution after a fatal error
*/
void
panic(void)
{
log_flush();
(void)kill(getpid(), SIGABRT);
_exit(1);
}
/*
* allocate a (small) amount of memory, and abort if it fails
*/
void *
xmalloc(size_t size)
{
void *p;
p = malloc(size);
if (p == NULL) {
log_puts("failed to allocate ");
log_putx(size);
log_puts(" bytes\n");
panic();
}
return p;
}
/*
* free memory allocated with xmalloc()
*/
void
xfree(void *p)
{
#ifdef DEBUG
if (p == NULL) {
log_puts("xfree with NULL arg\n");
panic();
}
#endif
free(p);
}
/*
* xmalloc-style strdup(3)
*/
char *
xstrdup(char *s)
{
size_t size;
void *p;
size = strlen(s) + 1;
p = xmalloc(size);
memcpy(p, s, size);
return p;
}
|
