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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/syscall.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "log.h"
#include "common.h"
#include "appconfig.h"
char *global_host_prefix = "";
int enable_ksm = 1;
/*
// http://stackoverflow.com/questions/7666509/hash-function-for-string
uint32_t simple_hash(const char *name)
{
const char *s = name;
uint32_t hash = 5381;
int i;
while((i = *s++)) hash = ((hash << 5) + hash) + i;
// fprintf(stderr, "HASH: %lu %s\n", hash, name);
return hash;
}
*/
// http://isthe.com/chongo/tech/comp/fnv/#FNV-1a
uint32_t simple_hash(const char *name) {
unsigned char *s = (unsigned char *)name;
uint32_t hval = 0x811c9dc5;
// FNV-1a algorithm
while (*s) {
// multiply by the 32 bit FNV magic prime mod 2^32
// gcc optimized
hval += (hval<<1) + (hval<<4) + (hval<<7) + (hval<<8) + (hval<<24);
// xor the bottom with the current octet
hval ^= (uint32_t)*s++;
}
// fprintf(stderr, "HASH: %u = %s\n", hval, name);
return hval;
}
/*
// http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx
// one at a time hash
uint32_t simple_hash(const char *name) {
unsigned char *s = (unsigned char *)name;
uint32_t h = 0;
while(*s) {
h += *s++;
h += (h << 10);
h ^= (h >> 6);
}
h += (h << 3);
h ^= (h >> 11);
h += (h << 15);
// fprintf(stderr, "HASH: %u = %s\n", h, name);
return h;
}
*/
void strreverse(char* begin, char* end)
{
char aux;
while (end > begin)
aux = *end, *end-- = *begin, *begin++ = aux;
}
char *mystrsep(char **ptr, char *s)
{
char *p = "";
while ( p && !p[0] && *ptr ) p = strsep(ptr, s);
return(p);
}
char *trim(char *s)
{
// skip leading spaces
while(*s && isspace(*s)) s++;
if(!*s || *s == '#') return NULL;
// skip tailing spaces
long c = (long) strlen(s) - 1;
while(c >= 0 && isspace(s[c])) {
s[c] = '\0';
c--;
}
if(c < 0) return NULL;
if(!*s) return NULL;
return s;
}
void *mymmap(const char *filename, size_t size, int flags, int ksm)
{
int fd;
void *mem = NULL;
errno = 0;
fd = open(filename, O_RDWR|O_CREAT|O_NOATIME, 0664);
if(fd != -1) {
if(lseek(fd, size, SEEK_SET) == (long)size) {
if(write(fd, "", 1) == 1) {
if(ftruncate(fd, size))
error("Cannot truncate file '%s' to size %ld. Will use the larger file.", filename, size);
#ifdef MADV_MERGEABLE
if(flags & MAP_SHARED || !enable_ksm || !ksm) {
#endif
mem = mmap(NULL, size, PROT_READ|PROT_WRITE, flags, fd, 0);
if(mem) {
int advise = MADV_SEQUENTIAL|MADV_DONTFORK;
if(flags & MAP_SHARED) advise |= MADV_WILLNEED;
if(madvise(mem, size, advise) != 0)
error("Cannot advise the kernel about the memory usage of file '%s'.", filename);
}
#ifdef MADV_MERGEABLE
}
else {
mem = mmap(NULL, size, PROT_READ|PROT_WRITE, flags|MAP_ANONYMOUS, -1, 0);
if(mem) {
if(lseek(fd, 0, SEEK_SET) == 0) {
if(read(fd, mem, size) != (ssize_t)size)
error("Cannot read from file '%s'", filename);
}
else
error("Cannot seek to beginning of file '%s'.", filename);
// don't use MADV_SEQUENTIAL|MADV_DONTFORK, they disable MADV_MERGEABLE
if(madvise(mem, size, MADV_SEQUENTIAL|MADV_DONTFORK) != 0)
error("Cannot advise the kernel about the memory usage (MADV_SEQUENTIAL|MADV_DONTFORK) of file '%s'.", filename);
if(madvise(mem, size, MADV_MERGEABLE) != 0)
error("Cannot advise the kernel about the memory usage (MADV_MERGEABLE) of file '%s'.", filename);
}
else
error("Cannot allocate PRIVATE ANONYMOUS memory for KSM for file '%s'.", filename);
}
#endif
}
else error("Cannot write to file '%s' at position %ld.", filename, size);
}
else error("Cannot seek file '%s' to size %ld.", filename, size);
close(fd);
}
else error("Cannot create/open file '%s'.", filename);
return mem;
}
int savememory(const char *filename, void *mem, unsigned long size)
{
char tmpfilename[FILENAME_MAX + 1];
snprintf(tmpfilename, FILENAME_MAX, "%s.%ld.tmp", filename, (long)getpid());
int fd = open(tmpfilename, O_RDWR|O_CREAT|O_NOATIME, 0664);
if(fd < 0) {
error("Cannot create/open file '%s'.", filename);
return -1;
}
if(write(fd, mem, size) != (long)size) {
error("Cannot write to file '%s' %ld bytes.", filename, (long)size);
close(fd);
return -1;
}
close(fd);
int ret = 0;
if(rename(tmpfilename, filename)) {
error("Cannot rename '%s' to '%s'", tmpfilename, filename);
ret = -1;
}
return ret;
}
int fd_is_valid(int fd) {
return fcntl(fd, F_GETFD) != -1 || errno != EBADF;
}
/*
***************************************************************************
* Get number of clock ticks per second.
***************************************************************************
*/
unsigned int hz;
void get_HZ(void)
{
long ticks;
if ((ticks = sysconf(_SC_CLK_TCK)) == -1) {
perror("sysconf");
}
hz = (unsigned int) ticks;
}
pid_t gettid(void)
{
return syscall(SYS_gettid);
}
|
