[152] | 1 | /* io.c */ |
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| 2 | #include <sys/types.h> |
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| 3 | #include <sys/socket.h> |
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| 4 | #include <arpa/inet.h> |
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| 5 | #include <netdb.h> |
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| 6 | |
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| 7 | #include "SolarSim.h" |
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| 8 | |
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| 9 | void |
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| 10 | read_initial( AState state, const char *filename ) { |
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| 11 | int i; |
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| 12 | double rx, ry, rz, vx, vy, vz, mass; |
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| 13 | |
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| 14 | FILE *f = fopen(filename, "rt"); |
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| 15 | if( !f ) { |
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| 16 | state->particles = 0; |
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| 17 | return; |
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| 18 | } |
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| 19 | |
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| 20 | fscanf( f, "%d\n", &state->particles ); |
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| 21 | state->masses = malloc( state->particles * sizeof(real) ); |
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| 22 | state->positions = malloc( state->particles * sizeof(vector) ); |
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| 23 | state->velocities = malloc( state->particles * sizeof(vector) ); |
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| 24 | state->accelerations = malloc( state->particles * sizeof(vector) ); |
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| 25 | |
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| 26 | for( i = 0; i < state->particles; i++ ) { |
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| 27 | fscanf( f, "%lf %lf %lf %lf %lf %lf %lf\n", &rx, &ry, &rz, &vx, &vy, &vz, &mass ); |
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| 28 | state->masses[i] = mass; |
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| 29 | v_init(&state->positions[i],(real)rx,(real)ry,(real)rz); |
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| 30 | v_init(&state->velocities[i],(real)vx,(real)vy,(real)vz); |
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| 31 | } |
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| 32 | |
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| 33 | fclose(f); |
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| 34 | } |
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| 35 | |
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| 36 | int |
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| 37 | connect_to_server( char *servername, int portno, int PROTOCOL ){ |
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| 38 | return connect_to_server_tcp(servername, portno); |
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| 39 | } |
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| 40 | |
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| 41 | int |
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| 42 | connect_to_server_tcp( char* servername, int portno ){ |
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| 43 | struct sockaddr_in serv_addr; |
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| 44 | struct hostent *server; |
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| 45 | int server_sockfd; |
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| 46 | |
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| 47 | server_sockfd = socket( AF_INET, SOCK_STREAM, 0 ); |
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| 48 | if ( server_sockfd < 0 ) { |
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| 49 | printf ( "ERROR opening socket" ); |
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| 50 | return -1; |
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| 51 | } |
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| 52 | |
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| 53 | server = gethostbyname( servername ); |
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| 54 | if (server == NULL) { |
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| 55 | fprintf( stderr, "ERROR, no such host\n" ); |
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| 56 | return -1; |
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| 57 | } |
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| 58 | |
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| 59 | memset( (char *) &serv_addr, 0, sizeof(serv_addr) ); |
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| 60 | serv_addr.sin_family = AF_INET; |
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| 61 | memcpy( (char *)&serv_addr.sin_addr.s_addr, (char *)server->h_addr, server->h_length ); |
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| 62 | serv_addr.sin_port = htons( portno ); |
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| 63 | |
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| 64 | if ( connect( server_sockfd, (struct sockaddr*) &serv_addr, sizeof( serv_addr ) ) < 0 ) { |
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| 65 | printf( "ERROR connecting" ); |
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| 66 | return -1; |
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| 67 | } |
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| 68 | |
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| 69 | return server_sockfd; |
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| 70 | } |
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| 71 | |
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| 72 | |
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| 73 | int |
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| 74 | connect_to_server_udp( char* servername, int portno ){ |
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| 75 | struct sockaddr_in serv_addr, cli_addr; |
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| 76 | struct hostent *server; |
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| 77 | int server_sockfd, n; |
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| 78 | |
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| 79 | server_sockfd = socket( AF_INET, SOCK_DGRAM, 0 ); |
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| 80 | if ( server_sockfd < 0 ) { |
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| 81 | printf ( "ERROR opening socket" ); |
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| 82 | return -1; |
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| 83 | } |
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| 84 | |
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| 85 | server = gethostbyname( servername ); |
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| 86 | if (server == NULL) { |
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| 87 | fprintf( stderr, "ERROR, no such host\n" ); |
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| 88 | return -1; |
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| 89 | } |
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| 90 | |
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| 91 | memset( (char *) &serv_addr, 0, sizeof(serv_addr) ); |
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| 92 | serv_addr.sin_family = AF_INET; |
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| 93 | memcpy( (char *)&serv_addr.sin_addr.s_addr, (char *)server->h_addr, server->h_length ); |
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| 94 | serv_addr.sin_port = htons( portno ); |
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| 95 | |
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| 96 | memset( (char *) &cli_addr, 0, sizeof(cli_addr) ); |
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| 97 | cli_addr.sin_family = AF_INET; |
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| 98 | cli_addr.sin_addr.s_addr = htonl(INADDR_ANY); |
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| 99 | cli_addr.sin_port = htons(0); |
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| 100 | |
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| 101 | n = bind(server_sockfd, (struct sockaddr *) &cli_addr, sizeof(cli_addr)); |
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| 102 | if( n < 0 ) { |
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| 103 | fprintf(stderr, "%d: cannot bind port\n", portno); |
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| 104 | return -1; |
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| 105 | } |
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| 106 | |
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| 107 | return server_sockfd; |
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| 108 | } |
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| 109 | |
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| 110 | void |
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| 111 | send_state( int sock, AState state ) { |
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| 112 | send( sock, &state->particles, sizeof(int), 0 ); |
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| 113 | send( sock, state->masses, state->particles*sizeof(real), 0 ); |
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| 114 | send( sock, state->positions, state->particles*sizeof(vector), 0 ); |
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| 115 | send( sock, state->velocities, state->particles*sizeof(vector), 0 ); |
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| 116 | } |
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| 117 | |
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| 118 | void |
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| 119 | write_state( int fd, AState state ) { |
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| 120 | write( fd, &state->particles, sizeof(int) ); |
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| 121 | write( fd, state->masses, state->particles*sizeof(real) ); |
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| 122 | write( fd, state->positions, state->particles*sizeof(vector) ); |
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| 123 | write( fd, state->velocities, state->particles*sizeof(vector) ); |
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| 124 | } |
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