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common.c
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#include "common.h"
#ifdef __APPLE__
#define INHERIT_NONE 0
#endif /* __APPLE__ */
#if defined(__FreeBSD__) || defined(__APPLE__)
# define O_NOATIME 0
# define MADV_DONTFORK INHERIT_NONE
#endif /* __FreeBSD__ || __APPLE__*/
char *netdata_configured_hostname = NULL;
char *netdata_configured_config_dir = NULL;
char *netdata_configured_log_dir = NULL;
char *netdata_configured_plugins_dir = NULL;
char *netdata_configured_web_dir = NULL;
char *netdata_configured_cache_dir = NULL;
char *netdata_configured_varlib_dir = NULL;
char *netdata_configured_home_dir = NULL;
char *netdata_configured_host_prefix = NULL;
char *netdata_configured_timezone = NULL;
int enable_ksm = 1;
volatile sig_atomic_t netdata_exit = 0;
const char *os_type = NETDATA_OS_TYPE;
const char *program_version = VERSION;
// ----------------------------------------------------------------------------
// memory allocation functions that handle failures
// although netdata does not use memory allocations too often (netdata tries to
// maintain its memory footprint stable during runtime, i.e. all buffers are
// allocated during initialization and are adapted to current use throughout
// its lifetime), these can be used to override the default system allocation
// routines.
#ifdef NETDATA_LOG_ALLOCATIONS
static struct memory_statistics {
volatile size_t malloc_calls_made;
volatile size_t calloc_calls_made;
volatile size_t realloc_calls_made;
volatile size_t strdup_calls_made;
volatile size_t free_calls_made;
volatile size_t memory_calls_made;
volatile size_t allocated_memory;
volatile size_t mmapped_memory;
} memory_statistics;
static inline void print_allocations(const char *file, const char *function, const unsigned long line) {
static struct memory_statistics old = { 0, 0, 0, 0, 0, 0, 0, 0 };
//if(unlikely(!(memory_statistics.memory_calls_made % 5))) {
fprintf(stderr, "(%04lu@%-10.10s:%-15.15s): Allocated %zu KB (+%zu B), mmapped %zu KB (+%zu B): malloc %zu (+%zu), calloc %zu (+%zu), realloc %zu (+%zu), strdup %zu (+%zu), free %zu (+%zu)\n",
line, file, function,
(memory_statistics.allocated_memory + 512) / 1024, memory_statistics.allocated_memory - old.allocated_memory,
(memory_statistics.mmapped_memory + 512) / 1024, memory_statistics.mmapped_memory - old.mmapped_memory,
memory_statistics.malloc_calls_made, memory_statistics.malloc_calls_made - old.malloc_calls_made,
memory_statistics.calloc_calls_made, memory_statistics.calloc_calls_made - old.calloc_calls_made,
memory_statistics.realloc_calls_made, memory_statistics.realloc_calls_made - old.realloc_calls_made,
memory_statistics.strdup_calls_made, memory_statistics.strdup_calls_made - old.strdup_calls_made,
memory_statistics.free_calls_made, memory_statistics.free_calls_made - old.free_calls_made
);
memcpy(&old, &memory_statistics, sizeof(struct memory_statistics));
//}
}
static inline void malloc_accounting(const char *file, const char *function, const unsigned long line, size_t size) {
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.malloc_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.malloc_calls_made++;
memory_statistics.allocated_memory += size;
#endif
print_allocations(file, function, line);
}
static inline void mmap_accounting(size_t size) {
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.malloc_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.mmapped_memory, size, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.mmapped_memory += size;
#endif
}
static inline void calloc_accounting(const char *file, const char *function, const unsigned long line, size_t size) {
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.calloc_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.calloc_calls_made++;
memory_statistics.allocated_memory += size;
#endif
print_allocations(file, function, line);
}
static inline void realloc_accounting(const char *file, const char *function, const unsigned long line, void *ptr, size_t size) {
(void)ptr;
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.realloc_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.realloc_calls_made++;
memory_statistics.allocated_memory += size;
#endif
print_allocations(file, function, line);
}
static inline void strdup_accounting(const char *file, const char *function, const unsigned long line, const char *s) {
size_t size = strlen(s) + 1;
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.strdup_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.strdup_calls_made++;
memory_statistics.allocated_memory += size;
#endif
print_allocations(file, function, line);
}
static inline void free_accounting(const char *file, const char *function, const unsigned long line, void *ptr) {
(void)file;
(void)function;
(void)line;
if(likely(ptr)) {
#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
__atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
__atomic_fetch_add(&memory_statistics.free_calls_made, 1, __ATOMIC_SEQ_CST);
#else
// this is for debugging - we don't care locking it
memory_statistics.memory_calls_made++;
memory_statistics.free_calls_made++;
#endif
}
}
#endif
#ifdef NETDATA_LOG_ALLOCATIONS
char *strdupz_int(const char *file, const char *function, const unsigned long line, const char *s) {
strdup_accounting(file, function, line, s);
#else
char *strdupz(const char *s) {
#endif
char *t = strdup(s);
if (unlikely(!t)) fatal("Cannot strdup() string '%s'", s);
return t;
}
#ifdef NETDATA_LOG_ALLOCATIONS
void *mallocz_int(const char *file, const char *function, const unsigned long line, size_t size) {
malloc_accounting(file, function, line, size);
#else
void *mallocz(size_t size) {
#endif
void *p = malloc(size);
if (unlikely(!p)) fatal("Cannot allocate %zu bytes of memory.", size);
return p;
}
#ifdef NETDATA_LOG_ALLOCATIONS
void *callocz_int(const char *file, const char *function, const unsigned long line, size_t nmemb, size_t size) {
calloc_accounting(file, function, line, nmemb * size);
#else
void *callocz(size_t nmemb, size_t size) {
#endif
void *p = calloc(nmemb, size);
if (unlikely(!p)) fatal("Cannot allocate %zu bytes of memory.", nmemb * size);
return p;
}
#ifdef NETDATA_LOG_ALLOCATIONS
void *reallocz_int(const char *file, const char *function, const unsigned long line, void *ptr, size_t size) {
realloc_accounting(file, function, line, ptr, size);
#else
void *reallocz(void *ptr, size_t size) {
#endif
void *p = realloc(ptr, size);
if (unlikely(!p)) fatal("Cannot re-allocate memory to %zu bytes.", size);
return p;
}
#ifdef NETDATA_LOG_ALLOCATIONS
void freez_int(const char *file, const char *function, const unsigned long line, void *ptr) {
free_accounting(file, function, line, ptr);
#else
void freez(void *ptr) {
#endif
free(ptr);
}
void json_escape_string(char *dst, const char *src, size_t size) {
const char *t;
char *d = dst, *e = &dst[size - 1];
for(t = src; *t && d < e ;t++) {
if(unlikely(*t == '\\' || *t == '"')) {
if(unlikely(d + 1 >= e)) break;
*d++ = '\\';
}
*d++ = *t;
}
*d = '\0';
}
void json_fix_string(char *s) {
unsigned char c;
while((c = (unsigned char)*s)) {
if(unlikely(c == '\\'))
*s++ = '/';
else if(unlikely(c == '"'))
*s++ = '\'';
else if(unlikely(isspace(c) || iscntrl(c)))
*s++ = ' ';
else if(unlikely(!isprint(c) || c > 127))
*s++ = '_';
else
s++;
}
}
int sleep_usec(usec_t usec) {
#ifndef NETDATA_WITH_USLEEP
// we expect microseconds (1.000.000 per second)
// but timespec is nanoseconds (1.000.000.000 per second)
struct timespec rem, req = {
.tv_sec = (time_t) (usec / 1000000),
.tv_nsec = (suseconds_t) ((usec % 1000000) * 1000)
};
while (nanosleep(&req, &rem) == -1) {
if (likely(errno == EINTR)) {
debug(D_SYSTEM, "nanosleep() interrupted (while sleeping for %llu microseconds).", usec);
req.tv_sec = rem.tv_sec;
req.tv_nsec = rem.tv_nsec;
} else {
error("Cannot nanosleep() for %llu microseconds.", usec);
break;
}
}
return 0;
#else
int ret = usleep(usec);
if(unlikely(ret == -1 && errno == EINVAL)) {
// on certain systems, usec has to be up to 999999
if(usec > 999999) {
int counter = usec / 999999;
while(counter--)
usleep(999999);
usleep(usec % 999999);
}
else {
error("Cannot usleep() for %llu microseconds.", usec);
return ret;
}
}
if(ret != 0)
error("usleep() failed for %llu microseconds.", usec);
return ret;
#endif
}
unsigned char netdata_map_chart_names[256] = {
[0] = '\0', //
[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] = '0', // 0
[49] = '1', // 1
[50] = '2', // 2
[51] = '3', // 3
[52] = '4', // 4
[53] = '5', // 5
[54] = '6', // 6
[55] = '7', // 7
[56] = '8', // 8
[57] = '9', // 9
[58] = '_', // :
[59] = '_', // ;
[60] = '_', // <
[61] = '_', // =
[62] = '_', // >
[63] = '_', // ?
[64] = '_', // @
[65] = 'a', // A
[66] = 'b', // B
[67] = 'c', // C
[68] = 'd', // D
[69] = 'e', // E
[70] = 'f', // F
[71] = 'g', // G
[72] = 'h', // H
[73] = 'i', // I
[74] = 'j', // J
[75] = 'k', // K
[76] = 'l', // L
[77] = 'm', // M
[78] = 'n', // N
[79] = 'o', // O
[80] = 'p', // P
[81] = 'q', // Q
[82] = 'r', // R
[83] = 's', // S
[84] = 't', // T
[85] = 'u', // U
[86] = 'v', // V
[87] = 'w', // W
[88] = 'x', // X
[89] = 'y', // Y
[90] = 'z', // Z
[91] = '_', // [
[92] = '/', // backslash
[93] = '_', // ]
[94] = '_', // ^
[95] = '_', // _
[96] = '_', // `
[97] = 'a', // a
[98] = 'b', // b
[99] = 'c', // c
[100] = 'd', // d
[101] = 'e', // e
[102] = 'f', // f
[103] = 'g', // g
[104] = 'h', // h
[105] = 'i', // i
[106] = 'j', // j
[107] = 'k', // k
[108] = 'l', // l
[109] = 'm', // m
[110] = 'n', // n
[111] = 'o', // o
[112] = 'p', // p
[113] = 'q', // q
[114] = 'r', // r
[115] = 's', // s
[116] = 't', // t
[117] = 'u', // u
[118] = 'v', // v
[119] = 'w', // w
[120] = 'x', // x
[121] = 'y', // y
[122] = 'z', // z
[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] = '_', //
[227] = '_', //
[228] = '_', //
[229] = '_', //
[230] = '_', //
[231] = '_', //
[232] = '_', //
[233] = '_', //
[234] = '_', //
[235] = '_', //
[236] = '_', //
[237] = '_', //
[238] = '_', //
[239] = '_', //
[240] = '_', //
[241] = '_', //
[242] = '_', //
[243] = '_', //
[244] = '_', //
[245] = '_', //
[246] = '_', //
[247] = '_', //
[248] = '_', //
[249] = '_', //
[250] = '_', //
[251] = '_', //
[252] = '_', //
[253] = '_', //
[254] = '_', //
[255] = '_' //
};
// make sure the supplied string
// is good for a netdata chart/dimension ID/NAME
void netdata_fix_chart_name(char *s) {
while ((*s = netdata_map_chart_names[(unsigned char) *s])) s++;
}
unsigned char netdata_map_chart_ids[256] = {
[0] = '\0', //
[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] = '0', // 0
[49] = '1', // 1
[50] = '2', // 2
[51] = '3', // 3
[52] = '4', // 4
[53] = '5', // 5
[54] = '6', // 6
[55] = '7', // 7
[56] = '8', // 8
[57] = '9', // 9
[58] = '_', // :
[59] = '_', // ;
[60] = '_', // <
[61] = '_', // =
[62] = '_', // >
[63] = '_', // ?
[64] = '_', // @
[65] = 'a', // A
[66] = 'b', // B
[67] = 'c', // C
[68] = 'd', // D
[69] = 'e', // E
[70] = 'f', // F
[71] = 'g', // G
[72] = 'h', // H
[73] = 'i', // I
[74] = 'j', // J
[75] = 'k', // K
[76] = 'l', // L
[77] = 'm', // M
[78] = 'n', // N
[79] = 'o', // O
[80] = 'p', // P
[81] = 'q', // Q
[82] = 'r', // R
[83] = 's', // S
[84] = 't', // T
[85] = 'u', // U
[86] = 'v', // V
[87] = 'w', // W
[88] = 'x', // X
[89] = 'y', // Y
[90] = 'z', // Z
[91] = '_', // [
[92] = '/', // backslash
[93] = '_', // ]
[94] = '_', // ^
[95] = '_', // _
[96] = '_', // `
[97] = 'a', // a
[98] = 'b', // b
[99] = 'c', // c
[100] = 'd', // d
[101] = 'e', // e
[102] = 'f', // f
[103] = 'g', // g
[104] = 'h', // h
[105] = 'i', // i
[106] = 'j', // j
[107] = 'k', // k
[108] = 'l', // l
[109] = 'm', // m
[110] = 'n', // n
[111] = 'o', // o
[112] = 'p', // p
[113] = 'q', // q
[114] = 'r', // r
[115] = 's', // s
[116] = 't', // t
[117] = 'u', // u
[118] = 'v', // v
[119] = 'w', // w
[120] = 'x', // x
[121] = 'y', // y
[122] = 'z', // z
[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] = '_', //
[227] = '_', //
[228] = '_', //
[229] = '_', //
[230] = '_', //
[231] = '_', //
[232] = '_', //
[233] = '_', //
[234] = '_', //
[235] = '_', //
[236] = '_', //
[237] = '_', //
[238] = '_', //
[239] = '_', //
[240] = '_', //
[241] = '_', //
[242] = '_', //
[243] = '_', //
[244] = '_', //
[245] = '_', //
[246] = '_', //
[247] = '_', //
[248] = '_', //
[249] = '_', //
[250] = '_', //
[251] = '_', //
[252] = '_', //
[253] = '_', //
[254] = '_', //
[255] = '_' //
};
// make sure the supplied string
// is good for a netdata chart/dimension ID/NAME
void netdata_fix_chart_id(char *s) {
while ((*s = netdata_map_chart_ids[(unsigned char) *s])) s++;
}
/*
// 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
// NOTE: No need to optimize with left shifts.
// GCC will use imul instruction anyway.
// Tested with 'gcc -O3 -S'
//hval += (hval<<1) + (hval<<4) + (hval<<7) + (hval<<8) + (hval<<24);
hval *= 16777619;
// xor the bottom with the current octet
hval ^= (uint32_t) *s++;
}
// fprintf(stderr, "HASH: %u = %s\n", hval, name);
return hval;
}
uint32_t simple_uhash(const char *name) {
unsigned char *s = (unsigned char *) name;
uint32_t hval = 0x811c9dc5, c;
// FNV-1a algorithm
while ((c = *s++)) {
if (unlikely(c >= 'A' && c <= 'Z')) c += 'a' - 'A';
hval *= 16777619;
hval ^= c;
}
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) {
while (end > begin) {
// clearer code.
char 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) return NULL;
// skip tailing spaces
// this way is way faster. Writes only one NUL char.
ssize_t l = strlen(s);
if (--l >= 0) {
char *p = s + l;
while (p > s && isspace(*p)) p--;
*++p = '\0';
}
if (!*s) return NULL;
return s;
}
inline char *trim_all(char *buffer) {
char *d = buffer, *s = buffer;
// skip spaces
while(isspace(*s)) s++;
while(*s) {
// copy the non-space part
while(*s && !isspace(*s)) *d++ = *s++;
// add a space if we have to
if(*s && isspace(*s)) {
*d++ = ' ';
s++;
}
// skip spaces
while(isspace(*s)) s++;
}
*d = '\0';
if(d > buffer) {
d--;
if(isspace(*d)) *d = '\0';
}
if(!buffer[0]) return NULL;
return buffer;
}
static int memory_file_open(const char *filename, size_t size) {
// info("memory_file_open('%s', %zu", filename, size);
int fd = open(filename, O_RDWR | O_CREAT | O_NOATIME, 0664);
if (fd != -1) {
if (lseek(fd, size, SEEK_SET) == (off_t) size) {
if (write(fd, "", 1) == 1) {
if (ftruncate(fd, size))
error("Cannot truncate file '%s' to size %zu. Will use the larger file.", filename, size);
}
else error("Cannot write to file '%s' at position %zu.", filename, size);
}
else error("Cannot seek file '%s' to size %zu.", filename, size);
}
else error("Cannot create/open file '%s'.", filename);
return fd;
}
// mmap_shared is used for memory mode = map
static void *memory_file_mmap(const char *filename, size_t size, int flags) {
// info("memory_file_mmap('%s', %zu", filename, size);
static int log_madvise = 1;
int fd = -1;
if(filename) {
fd = memory_file_open(filename, size);
if(fd == -1) return MAP_FAILED;
}
void *mem = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, fd, 0);
if (mem != MAP_FAILED) {
#ifdef NETDATA_LOG_ALLOCATIONS
mmap_accounting(size);
#endif
int advise = MADV_SEQUENTIAL | MADV_DONTFORK;
if (flags & MAP_SHARED) advise |= MADV_WILLNEED;