Merge pull request #77 from runderwo/unmalloc

Remove heap manipulation from fast path.

src/fping.c

@@ -259,6 +259,7 @@ unsigned int perhost_interval = DEFAULT_PERHOST_INTERVAL * 100;
 float backoff = DEFAULT_BACKOFF_FACTOR;
 unsigned int ping_data_size = DEFAULT_PING_DATA_SIZE;
 unsigned int ping_pkt_size;
+char *ping_buffer;
 unsigned int count = 1;
 unsigned int trials;
 unsigned int report_interval = 0;
@@ -822,6 +823,9 @@ int main( int argc, char **argv )
     }/* FOR */
 
     ping_pkt_size = ping_data_size + SIZE_ICMP_HDR;
+    ping_buffer = ( char* )malloc( ( size_t )ping_pkt_size );
+    if( !ping_buffer )
+        crash_and_burn( "can't malloc ping packet" );
 
     signal( SIGINT, finish );
     
@@ -1398,24 +1402,19 @@ void print_global_stats( void )
 
 int send_ping( int s, HOST_ENTRY *h )
 {
-    char *buffer;
     FPING_ICMPHDR *icp;
     int n;
     int myseq;
     int ret = 1;
 
-    buffer = ( char* )malloc( ( size_t )ping_pkt_size );
-    if( !buffer )
-        crash_and_burn( "can't malloc ping packet" );
-    
     if (random_data_flag) {
         for (n = 0; n < ping_pkt_size; ++n) {
-            buffer[n] = random() & 0xFF;
+            ping_buffer[n] = random() & 0xFF;
         }
     } else {
-        memset( buffer, 0, ping_pkt_size * sizeof( char ) );
+        memset( ping_buffer, 0, ping_pkt_size * sizeof( char ) );
     }
-    icp = ( FPING_ICMPHDR* )buffer;
+    icp = ( FPING_ICMPHDR* )ping_buffer;
 
     gettimeofday( &h->last_send_time, &tz );
     myseq = seqmap_add(h->i, h->num_sent, &h->last_send_time);
@@ -1441,7 +1440,7 @@ int send_ping( int s, HOST_ENTRY *h )
         printf( "sending [%d] to %s\n", h->num_sent, h->host );
 #endif /* DEBUG || _DEBUG */
 
-    n = sendto( s, buffer, ping_pkt_size, 0,
+    n = sendto( s, ping_buffer, ping_pkt_size, 0,
         ( struct sockaddr* )&h->saddr, sizeof( FPING_SOCKADDR ) );
 
     if(
@@ -1475,7 +1474,6 @@ int send_ping( int s, HOST_ENTRY *h )
     h->waiting++;
     num_pingsent++;
     last_send_time = h->last_send_time;
-    free( buffer );
 
     return(ret);
 }