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/proc/net parsing optimizations

This commit is contained in:
Doug MacEachern 2006-07-03 20:17:35 +00:00
parent f26a733bfa
commit b313b3ec27
1 changed files with 50 additions and 89 deletions
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139
src/os/linux/linux_sigar.c
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@ -1545,13 +1545,13 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
return SIGAR_OK;
}
static unsigned int hex2int(const char *x)
static SIGAR_INLINE unsigned int hex2int(const char *x, int len)
{
int i, ch;
int i;
unsigned int j;
for (i=0, j=0; i<8; i++) {
ch = x[i];
for (i=0, j=0; i<len; i++) {
register int ch = x[i];
j <<= 4;
if (isdigit(ch)) {
j |= ch - '0';
@ -1567,6 +1567,8 @@ static unsigned int hex2int(const char *x)
return j;
}
#define HEX_ENT_LEN 8
#ifdef __LP64__
#define ROUTE_FMT "%16s %128s %128s %X %ld %ld %ld %128s %ld %ld %ld\n"
#else
@ -1611,9 +1613,9 @@ int sigar_net_route_list_get(sigar_t *sigar,
}
route->flags = flags;
route->destination = hex2int(net_addr);
route->gateway = hex2int(gate_addr);
route->mask = hex2int(mask_addr);
route->destination = hex2int(net_addr, HEX_ENT_LEN);
route->gateway = hex2int(gate_addr, HEX_ENT_LEN);
route->mask = hex2int(mask_addr, HEX_ENT_LEN);
}
fclose(fp);
@ -1683,25 +1685,13 @@ int sigar_net_interface_stat_get(sigar_t *sigar, const char *name,
return found ? SIGAR_OK : ENXIO;
}
#define IS_NULL_PTR(ptr) ((ptr == NULL) || (*(ptr) == '\0'))
#define HEX_ENT_LEN 8
static SIGAR_INLINE int ip_format(char *buffer, int buflen, char *ptr)
static SIGAR_INLINE int ip_format(char *buffer, int buflen, char *ptr, int len)
{
int alen;
if (IS_NULL_PTR(ptr)) {
alen = 0;
}
else {
alen = strlen(ptr);
}
if (alen > HEX_ENT_LEN) {
if (len > HEX_ENT_LEN) {
struct in6_addr addr;
int i;
for (i=0; i<=3; i++, ptr+=8) {
addr.s6_addr32[i] = hex2int(ptr);
for (i=0; i<=3; i++, ptr+=HEX_ENT_LEN) {
addr.s6_addr32[i] = hex2int(ptr, HEX_ENT_LEN);
}
if (!inet_ntop(AF_INET6, &addr, buffer, buflen)) {
return errno;
@ -1709,7 +1699,7 @@ static SIGAR_INLINE int ip_format(char *buffer, int buflen, char *ptr)
}
else {
struct in_addr addr;
addr.s_addr = (alen == HEX_ENT_LEN) ? hex2int(ptr) : 0;
addr.s_addr = (len == HEX_ENT_LEN) ? hex2int(ptr, HEX_ENT_LEN) : 0;
if (!inet_ntop(AF_INET, &addr, buffer, buflen)) {
return errno;
}
@ -1747,12 +1737,18 @@ static int proc_net_walker(sigar_net_connection_walker_t *walker,
return SIGAR_OK; /* continue loop */
}
#define SKIP_WHILE(p, c) while (*p == c) p++
#define SKIP_PAST(p, c) \
while(*p && (*p != c)) p++; \
SKIP_WHILE(p, c)
static int proc_net_read(sigar_net_connection_walker_t *walker,
const char *fname,
int type)
{
FILE *fp;
char buffer[8192], *ptr;
char buffer[8192];
char *ptr;
int flags = walker->flags;
if (!(fp = fopen(fname, "r"))) {
@ -1763,56 +1759,37 @@ static int proc_net_read(sigar_net_connection_walker_t *walker,
while ((ptr = fgets(buffer, sizeof(buffer), fp))) {
sigar_net_connection_t conn;
char *port = NULL;
char *laddr, *raddr;
int laddr_len=0, raddr_len=0;
int status, more;
SIGAR_SKIP_SPACE(ptr);
if (IS_NULL_PTR(ptr)) {
continue;
}
/* skip leading space */
SKIP_WHILE(ptr, ' ');
ptr = sigar_skip_token(ptr); /* skip number */
while (isspace(*ptr)) {
ptr++;
}
if (IS_NULL_PTR(ptr)) {
continue;
}
/* skip "%d: " */
SKIP_PAST(ptr, ' ');
if (!(port = strchr(ptr, ':'))) {
continue;
}
*port = '\0';
++port;
conn.local_port = (strtoul(port, &port, 16) & 0xffff);
laddr = ptr;
ptr = port;
while (isspace(*ptr)) {
while (*ptr && (*ptr != ':')) {
laddr_len++;
ptr++;
}
if (IS_NULL_PTR(ptr)) {
continue;
}
SKIP_WHILE(ptr, ':');
if (!(port = strchr(ptr, ':'))) {
continue;
}
*port = '\0';
++port;
conn.local_port = (strtoul(ptr, &ptr, 16) & 0xffff);
SKIP_WHILE(ptr, ' ');
conn.remote_port = (strtoul(port, &port, 16) & 0xffff);
raddr = ptr;
ptr = port;
while (isspace(*ptr)) {
while (*ptr && (*ptr != ':')) {
raddr_len++;
ptr++;
}
if (IS_NULL_PTR(ptr)) {
continue;
}
SKIP_WHILE(ptr, ':');
conn.remote_port = (strtoul(ptr, &ptr, 16) & 0xffff);
SKIP_WHILE(ptr, ' ');
if (!((conn.remote_port && (flags & SIGAR_NETCONN_CLIENT)) ||
(!conn.remote_port && (flags & SIGAR_NETCONN_SERVER))))
@ -1824,7 +1801,7 @@ static int proc_net_read(sigar_net_connection_walker_t *walker,
status = ip_format(conn.local_address,
sizeof(conn.local_address),
laddr);
laddr, laddr_len);
if (status != SIGAR_OK) {
return status;
@ -1832,46 +1809,30 @@ static int proc_net_read(sigar_net_connection_walker_t *walker,
status = ip_format(conn.remote_address,
sizeof(conn.remote_address),
raddr);
raddr, raddr_len);
if (status != SIGAR_OK) {
return status;
}
/* SIGAR_TCP_* currently matches TCP_* in linux/tcp.h */
sscanf(ptr, "%2x", &conn.state);
ptr = sigar_skip_token(ptr);
SIGAR_SKIP_SPACE(ptr);
if (IS_NULL_PTR(ptr)) {
continue;
}
conn.state = hex2int(ptr, 2);
ptr += 2;
SKIP_WHILE(ptr, ' ');
if (strlen(ptr) < ((HEX_ENT_LEN*2) + 1)) {
continue;
}
conn.send_queue = hex2int(ptr);
conn.send_queue = hex2int(ptr, HEX_ENT_LEN);
ptr += HEX_ENT_LEN+1; /* tx + ':' */;
conn.receive_queue = hex2int(ptr);
conn.receive_queue = hex2int(ptr, HEX_ENT_LEN);
ptr += HEX_ENT_LEN;
SKIP_WHILE(ptr, ' ');
SIGAR_SKIP_SPACE(ptr);
if (IS_NULL_PTR(ptr)) {
continue;
}
ptr = sigar_skip_multiple_token(ptr, 2); /* tr:tm->when retrnsmt */
if (IS_NULL_PTR(ptr)) {
continue;
}
SKIP_PAST(ptr, ' '); /* tr:tm->whem */
SKIP_PAST(ptr, ' '); /* retrnsmt */
conn.uid = sigar_strtoul(ptr);
ptr = sigar_skip_token(ptr);
if (IS_NULL_PTR(ptr)) {
continue;
}
SKIP_PAST(ptr, ' '); /* timeout */
conn.inode = sigar_strtoul(ptr);