File size: 4,288 Bytes
d4035c1 |
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 |
/** file: tinyLockClient.c
** brief: tinyLockClient - MEX implementation
** author: Andrea Vedaldi
**/
#include "mex.h"
#if defined(__WIN32__) || defined(__WIN64__) || defined(__WINDOWS__) || \
defined(_WIN32) || defined(_WIN64)
#include <io.h>
#include <stdlib.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/time.h>
#include <unistd.h>
#include <netdb.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#if defined(_WIN32) || defined(_WIN64)
#define close _close
#endif
/* Return value:
-1: error occured
0: timed out
>0: data ready to be read
*/
int
recvfromTimeOut(int socket, long sec, long usec)
{
struct timeval timeout ;
fd_set fds ;
timeout.tv_sec = sec ;
timeout.tv_usec = usec ;
FD_ZERO (&fds) ;
FD_SET (socket, &fds) ;
return select(socket+1, &fds, 0, 0, &timeout);
}
void
mexFunction(int nout, mxArray *out[],
int nin, const mxArray *in[])
{
char address [1024] ;
char port [1024] ;
char key [1024] ;
struct addrinfo servHints ;
struct addrinfo *servInfo ;
int status ;
enum {IN_HOST, IN_PORT, IN_KEY} ;
enum {OUT_GO} ;
if (nin != 3) {
mexErrMsgTxt("Three arguments required") ;
}
if (mxGetString(in[IN_HOST], address, sizeof(address))) {
mexErrMsgTxt("HOST must be a string") ;
}
if (mxGetString(in[IN_PORT], port, sizeof(port))) {
mexErrMsgTxt("PORT must be a string") ;
}
if (mxGetString(in[IN_KEY], key, sizeof(key))) {
mexErrMsgTxt("KEY must be a string") ;
}
/* IN address of server */
memset(&servHints, 0, sizeof(servHints));
servHints.ai_family = AF_INET ; /* AF_UNSPEC */
servHints.ai_socktype = SOCK_DGRAM ;
status = getaddrinfo(address, port, &servHints, &servInfo) ;
if (status) {
mexPrintf(gai_strerror(status)) ;
mexErrMsgTxt("getaddrinfo") ;
}
#if 1
{
struct addrinfo *p ;
for(p = servInfo ; p != NULL ; p = p->ai_next) {
void *addr;
char *ipver;
char ipstr[INET6_ADDRSTRLEN];
int port ;
/* get the pointer to the address itself,
* different fields in IPv4 and IPv6: */
if (p->ai_family == AF_INET) { /* IPv4 */
struct sockaddr_in *ipv4 = (struct sockaddr_in *) p->ai_addr ;
addr = &(ipv4->sin_addr);
port = ntohs(ipv4->sin_port) ;
ipver = "IPv4";
} else { /* IPv6 */
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
addr = &(ipv6->sin6_addr);
port = ntohs(ipv6->sin6_port) ;
ipver = "IPv6";
}
/* convert the IP to a string and print it: */
inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
mexPrintf(" %s: %s (port %d)\n", ipver, ipstr, port);
}
}
#endif
{
char answer [1024] ;
int unsigned answerLength = sizeof(answer) ;
int answerRecvLength ;
int clientSocket ;
socklen_t fromLength = sizeof(struct sockaddr_in) ;
int numAttemptsLeft = 5 ;
memset(answer, 0, answerLength) ;
clientSocket = socket(servInfo->ai_family,
servInfo->ai_socktype,
servInfo->ai_protocol) ;
if (clientSocket < 0) {
mexErrMsgTxt("socket()") ;
}
while (numAttemptsLeft -- > 0) {
status = sendto(clientSocket,
key,
strlen(key),
0,
servInfo->ai_addr,
sizeof(struct sockaddr_in)) ;
status = recvfromTimeOut(clientSocket, 5, 0) ;
if (status < 0) break ;
if (status == 0) {
mexPrintf("Resending request due to timeout (%d left)\n",
numAttemptsLeft) ;
continue ;
}
answerRecvLength = recvfrom(clientSocket,
answer,
answerLength,
0,
servInfo->ai_addr,
&fromLength) ;
break ;
/* mexPrintf("answ %d: '%s'\n", answerRecvLength, answer) ; */
}
close(clientSocket) ;
out[OUT_GO] = mxCreateLogicalScalar(strcmp(answer, "stop") != 0) ;
}
freeaddrinfo(servInfo) ;
}
|