libcm is a C development framework with an emphasis on audio signal processing applications.
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cmUdpPort.c 16KB

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  1. #include "cmPrefix.h"
  2. #include "cmGlobal.h"
  3. #include "cmRpt.h"
  4. #include "cmErr.h"
  5. #include "cmCtx.h"
  6. #include "cmMem.h"
  7. #include "cmMallocDebug.h"
  8. #include "cmThread.h"
  9. #include <sys/socket.h>
  10. #include <netinet/in.h>
  11. #include <arpa/inet.h>
  12. #include <fcntl.h>
  13. #include <unistd.h> // close
  14. #include "cmUdpPort.h"
  15. #define cmUdp_SYS_ERR (-1)
  16. #define cmUdp_NULL_SOCK (-1)
  17. #ifndef HOST_NAME_MAX
  18. #define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
  19. #endif
  20. enum
  21. {
  22. kIsConnectedUdpFl = 0x01,
  23. kIsBlockingUdpFl = 0x02,
  24. kQueueingUdpFl = 0x04
  25. };
  26. typedef struct
  27. {
  28. cmErr_t err;
  29. int sockH;
  30. cmUdpCallback_t cbFunc;
  31. void* cbArg;
  32. unsigned timeOutMs;
  33. unsigned flags;
  34. cmThreadH_t thH;
  35. cmTs1p1cH_t qH;
  36. unsigned recvBufByteCnt;
  37. char* tempBuf;
  38. unsigned timeOutCnt;
  39. unsigned recvCnt;
  40. unsigned queCbCnt;
  41. unsigned errCnt;
  42. struct sockaddr_in sockaddr;
  43. cmChar_t ntopBuf[ INET_ADDRSTRLEN+1 ]; // use INET6_ADDRSTRLEN for IPv6
  44. cmChar_t hnameBuf[ HOST_NAME_MAX+1 ];
  45. } cmUdp_t;
  46. cmUdpH_t cmUdpNullHandle = cmSTATIC_NULL_HANDLE;
  47. #define _cmUdpClear_errno() errno = 0
  48. cmUdp_t* _cmUdpHandleToPtr( cmUdpH_t h )
  49. {
  50. cmUdp_t* p = (cmUdp_t*)h.h;
  51. assert(p != NULL);
  52. return p;
  53. }
  54. cmUdpRC_t _cmUdpFinal( cmUdp_t* p )
  55. {
  56. cmUdpRC_t rc = kOkUdpRC;
  57. if( cmThreadIsValid(p->thH) )
  58. if( cmThreadDestroy(&p->thH) != kOkThRC )
  59. return cmErrMsg(&p->err,kThreadFailUdpRC,"Listener thread destroy failed.");
  60. if( cmTs1p1cIsValid(p->qH) )
  61. if( cmTs1p1cDestroy(&p->qH) != kOkThRC )
  62. cmErrMsg(&p->err,kQueueFailUdpRC,"Receive data queue destroy failed.");
  63. cmMemPtrFree(&p->tempBuf);
  64. // close the socket
  65. if( p->sockH != cmUdp_NULL_SOCK )
  66. {
  67. _cmUdpClear_errno();
  68. if( close(p->sockH) != 0 )
  69. cmErrSysMsg(&p->err,kSockCloseFailUdpRC,errno,"The socket close failed." );
  70. p->sockH = cmUdp_NULL_SOCK;
  71. }
  72. return rc;
  73. }
  74. cmUdpRC_t _cmUdpFree( cmUdp_t* p )
  75. {
  76. cmUdpRC_t rc;
  77. if((rc = _cmUdpFinal(p)) != kOkUdpRC )
  78. return rc;
  79. cmMemFree(p);
  80. return rc;
  81. }
  82. cmUdpRC_t _cmUdpInitAddr( cmUdp_t* p, const char* addrStr, cmUdpPort_t portNumber, struct sockaddr_in* retAddrPtr )
  83. {
  84. memset(retAddrPtr,0,sizeof(struct sockaddr_in));
  85. if( portNumber == kInvalidUdpPortNumber )
  86. return cmErrMsg(&p->err,kInvalidPortNumbUdpRC,"The port number %i cannot be used.",kInvalidUdpPortNumber);
  87. if( addrStr == NULL )
  88. retAddrPtr->sin_addr.s_addr = htonl(INADDR_ANY);
  89. else
  90. {
  91. _cmUdpClear_errno();
  92. if(inet_pton(AF_INET,addrStr,&retAddrPtr->sin_addr) == 0 )
  93. //if(( retAddrPtr->sin_addr.s_addr = inet_addr(addrStr)) == INADDR_NONE )
  94. return cmErrSysMsg(&p->err,kPtoNFailUdpRC,errno, "The network address string '%s' could not be converted to a netword address structure.",cmStringNullGuard(addrStr) );
  95. }
  96. //retAddrPtr->sin_len = sizeof(struct sockaddr_in);
  97. retAddrPtr->sin_family = AF_INET;
  98. retAddrPtr->sin_port = htons(portNumber);
  99. return kOkUdpRC;
  100. }
  101. cmUdpRC_t _cmUdpConnect( cmUdp_t* p, const char* remoteAddr, cmUdpPort_t remotePort )
  102. {
  103. struct sockaddr_in addr;
  104. cmUdpRC_t rc;
  105. // create the remote address
  106. if((rc = _cmUdpInitAddr(p, remoteAddr, remotePort, &addr )) != kOkUdpRC )
  107. return rc;
  108. _cmUdpClear_errno();
  109. // ... and connect this socket to the remote address/port
  110. if( connect(p->sockH, (struct sockaddr*)&addr, sizeof(addr)) == cmUdp_SYS_ERR )
  111. return cmErrSysMsg(&p->err,kSockConnectFailUdpRC, errno, "Socket connect failed." );
  112. p->flags = cmSetFlag(p->flags,kIsConnectedUdpFl);
  113. return rc;
  114. }
  115. cmUdpRC_t cmUdpAlloc( cmCtx_t* ctx, cmUdpH_t* hp )
  116. {
  117. cmUdpRC_t rc;
  118. if((rc = cmUdpFree(hp)) != kOkUdpRC )
  119. return rc;
  120. cmUdp_t* p = cmMemAllocZ(cmUdp_t,1);
  121. cmErrSetup(&p->err,&ctx->rpt,"UDP Port");
  122. p->sockH = cmUdp_NULL_SOCK;
  123. hp->h = p;
  124. return rc;
  125. }
  126. cmUdpRC_t cmUdpFree( cmUdpH_t* hp )
  127. {
  128. cmUdpRC_t rc = kOkUdpRC;
  129. if( hp == NULL || cmUdpIsValid(*hp)==false)
  130. return rc;
  131. cmUdp_t* p = _cmUdpHandleToPtr(*hp);
  132. if((rc = _cmUdpFree(p)) != kOkUdpRC )
  133. return rc;
  134. hp->h = NULL;
  135. return rc;
  136. }
  137. cmUdpRC_t cmUdpInit(
  138. cmUdpH_t h,
  139. cmUdpPort_t port,
  140. unsigned flags,
  141. cmUdpCallback_t cbFunc,
  142. void* cbArg,
  143. const char* remoteAddr,
  144. cmUdpPort_t remotePort,
  145. unsigned recvBufByteCnt,
  146. unsigned timeOutMs )
  147. {
  148. cmUdpRC_t rc;
  149. cmUdp_t* p = _cmUdpHandleToPtr(h);
  150. if((rc = _cmUdpFinal(p)) != kOkUdpRC )
  151. return rc;
  152. _cmUdpClear_errno();
  153. // get a handle to the socket
  154. if(( p->sockH = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP ) ) == cmUdp_SYS_ERR )
  155. return cmErrSysMsg(&p->err, kSockCreateFailUdpRC, errno, "Socket create failed." );
  156. // create the local address
  157. if((rc = _cmUdpInitAddr(p, NULL, port, &p->sockaddr )) != kOkUdpRC )
  158. goto errLabel;
  159. // bind the socket to a local address/port
  160. if( (bind( p->sockH, (struct sockaddr*)&p->sockaddr, sizeof(p->sockaddr))) == cmUdp_SYS_ERR )
  161. {
  162. rc = cmErrSysMsg(&p->err,kSockBindFailUdpRC,errno,"Socket bind failed." );
  163. goto errLabel;
  164. }
  165. // if a remote addr was given connect this socket to it
  166. if( remoteAddr != NULL )
  167. if((rc = _cmUdpConnect(p,remoteAddr,remotePort)) != kOkUdpRC )
  168. goto errLabel;
  169. // if this socket should block
  170. if( cmIsFlag(flags,kBlockingUdpFl) )
  171. {
  172. struct timeval timeOut;
  173. // set the socket time out
  174. timeOut.tv_sec = timeOutMs/1000;
  175. timeOut.tv_usec = (timeOutMs - (timeOut.tv_sec * 1000)) * 1000;
  176. if( setsockopt( p->sockH, SOL_SOCKET, SO_RCVTIMEO, &timeOut, sizeof(timeOut) ) == cmUdp_SYS_ERR )
  177. {
  178. rc = cmErrSysMsg(&p->err,kSockOptSetFailUdpRC,errno, "Attempt to set the socket timeout failed." );
  179. goto errLabel;
  180. }
  181. p->flags = cmSetFlag(p->flags,kIsBlockingUdpFl);
  182. }
  183. else
  184. {
  185. int opts;
  186. // get the socket options flags
  187. if( (opts = fcntl(p->sockH,F_GETFL)) < 0 )
  188. {
  189. rc = cmErrSysMsg(&p->err,kSockOptSetFailUdpRC,errno, "Attempt to get the socket options flags failed." );
  190. goto errLabel;
  191. }
  192. opts = (opts | O_NONBLOCK);
  193. // set the socket options flags
  194. if(fcntl(p->sockH,F_SETFL,opts) < 0)
  195. {
  196. rc = cmErrSysMsg(&p->err,kSockOptSetFailUdpRC,errno, "Attempt to set the socket to non-blocking failed." );
  197. goto errLabel;
  198. }
  199. }
  200. // if broadcast option was requested.
  201. if( cmIsFlag(flags,kBroadcastUdpFl) )
  202. {
  203. int bcastFl = 1;
  204. if( setsockopt( p->sockH, SOL_SOCKET, SO_BROADCAST, &bcastFl, sizeof(bcastFl) ) == cmUdp_SYS_ERR )
  205. {
  206. rc = cmErrSysMsg(&p->err,kSockOptSetFailUdpRC,errno, "Attempt to set the socket broadcast attribute failed." );
  207. goto errLabel;
  208. }
  209. }
  210. if( recvBufByteCnt != 0 )
  211. p->tempBuf = cmMemAlloc(char,recvBufByteCnt );
  212. p->timeOutMs = timeOutMs;
  213. p->cbFunc = cbFunc;
  214. p->cbArg = cbArg;
  215. p->recvBufByteCnt = recvBufByteCnt;
  216. p->timeOutCnt = 0;
  217. p->recvCnt = 0;
  218. p->queCbCnt = 0;
  219. p->errCnt = 0;
  220. if( cmIsFlag(flags,kNoQueueUdpFl) == false )
  221. p->flags = cmSetFlag(p->flags,kQueueingUdpFl);
  222. errLabel:
  223. if( rc != kOkUdpRC )
  224. _cmUdpFree(p);
  225. return rc;
  226. }
  227. cmUdpRC_t cmUdpFinal( cmUdpH_t h )
  228. {
  229. cmUdp_t* p = _cmUdpHandleToPtr(h);
  230. return _cmUdpFinal(p);
  231. }
  232. bool cmUdpIsValid( cmUdpH_t h )
  233. { return h.h != NULL; }
  234. const struct sockaddr_in* cmUdpLocalAddr( cmUdpH_t h )
  235. {
  236. cmUdp_t* p = _cmUdpHandleToPtr(h);
  237. return &p->sockaddr;
  238. }
  239. cmUdpRC_t cmUdpConnect( cmUdpH_t h, const char* remoteAddr, cmUdpPort_t remotePort )
  240. {
  241. cmUdp_t* p = _cmUdpHandleToPtr(h);
  242. return _cmUdpConnect(p,remoteAddr,remotePort);
  243. }
  244. cmUdpRC_t cmUdpSend( cmUdpH_t h, const char* data, unsigned dataByteCnt )
  245. {
  246. cmUdp_t* p = _cmUdpHandleToPtr(h);
  247. _cmUdpClear_errno();
  248. if( cmIsFlag(p->flags,kIsConnectedUdpFl) == false )
  249. return cmErrMsg(&p->err,kNotConnectedUdpRC,"cmUdpSend() only works with connected sockets.");
  250. if( send( p->sockH, data, dataByteCnt, 0 ) == cmUdp_SYS_ERR )
  251. return cmErrSysMsg(&p->err,kSockSendFailUdpRC,errno,"Send failed.");
  252. return kOkUdpRC;
  253. }
  254. cmUdpRC_t cmUdpSendTo( cmUdpH_t h, const char* data, unsigned dataByteCnt, const struct sockaddr_in* remoteAddr )
  255. {
  256. cmUdp_t* p = _cmUdpHandleToPtr(h);
  257. _cmUdpClear_errno();
  258. if( sendto(p->sockH, data, dataByteCnt, 0, (struct sockaddr*)remoteAddr, sizeof(*remoteAddr)) == cmUdp_SYS_ERR )
  259. return cmErrSysMsg(&p->err,kSockSendFailUdpRC,errno,"SendTo failed.");
  260. return kOkUdpRC;
  261. }
  262. cmUdpRC_t cmUdpSend2( cmUdpH_t h, const char* data, unsigned dataByteCnt, const char* remoteAddr, cmUdpPort_t remotePort )
  263. {
  264. cmUdpRC_t rc;
  265. cmUdp_t* p = _cmUdpHandleToPtr(h);
  266. struct sockaddr_in addr;
  267. if((rc = _cmUdpInitAddr(p,remoteAddr,remotePort,&addr)) != kOkUdpRC )
  268. return rc;
  269. return cmUdpSendTo( h, data, dataByteCnt, &addr );
  270. }
  271. cmUdpRC_t cmUdpRecv( cmUdpH_t h, char* data, unsigned dataByteCnt, struct sockaddr_in* fromAddr, unsigned* recvByteCntPtr )
  272. {
  273. cmUdp_t* p = _cmUdpHandleToPtr(h);
  274. cmUdpRC_t rc = kOkUdpRC;
  275. ssize_t retVal = 0;
  276. socklen_t sizeOfRemoteAddr = fromAddr==NULL ? 0 : sizeof(struct sockaddr_in);
  277. _cmUdpClear_errno();
  278. if( recvByteCntPtr != NULL )
  279. *recvByteCntPtr = 0;
  280. if((retVal = recvfrom(p->sockH, data, dataByteCnt, 0, (struct sockaddr*)fromAddr, &sizeOfRemoteAddr )) == cmUdp_SYS_ERR )
  281. return cmErrSysMsg(&p->err,kSockRecvFailUdpRC,errno,"recvFrom() failed.");
  282. if( recvByteCntPtr != NULL )
  283. *recvByteCntPtr = retVal;
  284. return rc;
  285. }
  286. bool _cmUdpThreadCb(void* param)
  287. {
  288. cmUdp_t* p = (cmUdp_t*)param;
  289. fd_set rdSet;
  290. struct timeval timeOut;
  291. // setup the select() call
  292. FD_ZERO(&rdSet);
  293. FD_SET(p->sockH, &rdSet );
  294. timeOut.tv_sec = p->timeOutMs/1000;
  295. timeOut.tv_usec = (p->timeOutMs - (timeOut.tv_sec * 1000)) * 1000;
  296. // NOTE; select() takes the highest socket value plus one of all the sockets in all the sets.
  297. switch( select(p->sockH+1,&rdSet,NULL,NULL,&timeOut) )
  298. {
  299. case -1: // error
  300. if( errno != EINTR )
  301. cmErrSysMsg(&p->err,kSockSelectFailUdpRC,errno,"Select failed.");
  302. ++p->errCnt;
  303. break;
  304. case 0: // select() timed out
  305. ++p->timeOutCnt;
  306. break;
  307. case 1: // (> 0) count of ready descripters
  308. if( FD_ISSET(p->sockH,&rdSet) )
  309. {
  310. struct sockaddr_in remoteAddr;
  311. socklen_t addrByteCnt = sizeof(remoteAddr);
  312. ssize_t retByteCnt;
  313. _cmUdpClear_errno();
  314. ++p->recvCnt;
  315. // recv the incoming msg into p->tempBuf[]
  316. if(( retByteCnt = recvfrom( p->sockH, p->tempBuf, p->recvBufByteCnt, 0, (struct sockaddr*)&remoteAddr, &addrByteCnt )) == cmUdp_SYS_ERR )
  317. cmErrSysMsg(&p->err,kSockRecvFailUdpRC,errno,"recvfrom() failed.");
  318. else
  319. {
  320. // check for overflow
  321. if( retByteCnt == p->recvBufByteCnt )
  322. cmErrMsg(&p->err,kRecvBufOverflowUdpRC,"The receive buffer requires more than %i bytes.",p->recvBufByteCnt);
  323. else
  324. {
  325. // if queueing is enabled
  326. if( cmIsFlag(p->flags,kQueueingUdpFl ) )
  327. {
  328. // enqueue the msg - with the source address appended after the data
  329. const void* msgPtrArray[] = { p->tempBuf, &remoteAddr, p->tempBuf };
  330. unsigned msgByteCntArray[] = { retByteCnt, sizeof(remoteAddr) };
  331. if( cmTs1p1cEnqueueSegMsg( p->qH, msgPtrArray, msgByteCntArray, 2 ) != kOkThRC )
  332. cmErrMsg(&p->err,kQueueFailUdpRC,"A received msg containing %i bytes was not queued.",retByteCnt);
  333. }
  334. else // if queueing is not enabled - transmit the data directly via the callback
  335. if( p->cbFunc != NULL )
  336. {
  337. p->cbFunc(p->cbArg,p->tempBuf,retByteCnt,&remoteAddr);
  338. }
  339. }
  340. }
  341. }
  342. break;
  343. default:
  344. { assert(0); }
  345. } // switch
  346. return true;
  347. }
  348. cmRC_t _cmUdpQueueCb(void* userCbPtr, unsigned msgByteCnt, const void* msgDataPtr )
  349. {
  350. cmUdp_t* p = (cmUdp_t*)userCbPtr;
  351. if( p->cbFunc != NULL )
  352. {
  353. struct sockaddr_in addr;
  354. assert( msgByteCnt >= sizeof(addr));
  355. const char* dataPtr = (const char*)msgDataPtr;
  356. // the address of the data source is apppended to the data bytes.
  357. const char* addrPtr = dataPtr + msgByteCnt - sizeof(addr);
  358. memcpy(&addr,addrPtr,sizeof(addr));
  359. // make the receive callback
  360. p->cbFunc(p->cbArg,dataPtr,msgByteCnt-sizeof(addr),&addr);
  361. ++p->queCbCnt;
  362. }
  363. return cmOkRC;
  364. }
  365. cmUdpRC_t cmUdpEnableListen( cmUdpH_t h, bool enableFl )
  366. {
  367. cmUdp_t* p = _cmUdpHandleToPtr(h);
  368. if( cmThreadIsValid(p->thH) == false && enableFl == true)
  369. {
  370. if(cmThreadCreate(&p->thH,_cmUdpThreadCb,p,p->err.rpt) != kOkThRC )
  371. return cmErrMsg(&p->err,kThreadFailUdpRC,"Listener thread create failed.");
  372. if(cmTs1p1cCreate(&p->qH,p->recvBufByteCnt,_cmUdpQueueCb,p,p->err.rpt) != kOkThRC )
  373. return cmErrMsg(&p->err,kQueueFailUdpRC,"Listener data queue create failed.");
  374. }
  375. if( cmThreadIsValid(p->thH) )
  376. if( cmThreadPause( p->thH, enableFl ? 0 : kPauseThFl ) != kOkThRC )
  377. return cmErrMsg(&p->err,kThreadFailUdpRC,"The listener thread failed to %s.", enableFl ? "pause" : "un-pause" );
  378. return kOkUdpRC;
  379. }
  380. bool cmUdpIsQueueEnabled( cmUdpH_t h )
  381. {
  382. cmUdp_t* p = _cmUdpHandleToPtr(h);
  383. return cmIsFlag(p->flags,kQueueingUdpFl);
  384. }
  385. void cmUdpQueueEnable( cmUdpH_t h, bool enableFl )
  386. {
  387. cmUdp_t* p = _cmUdpHandleToPtr(h);
  388. p->flags = cmSetFlag(p->flags,kQueueingUdpFl);
  389. }
  390. unsigned cmUdpAvailDataByteCount( cmUdpH_t h )
  391. {
  392. cmUdp_t* p = _cmUdpHandleToPtr(h);
  393. return cmTs1p1cIsValid(p->qH) ? cmTs1p1cDequeueMsgByteCount( p->qH ) : 0;
  394. }
  395. cmUdpRC_t cmUdpGetAvailData( cmUdpH_t h, char* data, unsigned* dataByteCntPtr, struct sockaddr_in* fromAddr )
  396. {
  397. cmUdp_t* p = _cmUdpHandleToPtr(h);
  398. unsigned availByteCnt;
  399. // if a received msg is queued
  400. if( (availByteCnt = cmTs1p1cAvailByteCount(p->qH)) > 0 )
  401. {
  402. // all msg's must have at least a source address
  403. assert( availByteCnt >= sizeof(*fromAddr) );
  404. // get the size of the return buffer (or 0 if there is no return buffer)
  405. unsigned dataByteCnt = (data != NULL && dataByteCntPtr != NULL) ? *dataByteCntPtr : 0;
  406. if( dataByteCnt == 0 )
  407. data = NULL;
  408. // dequeue the msg - if data==NULL then the data will be returned by
  409. // a call to the callback function provided in cmUdpAlloc().
  410. if( cmTs1p1cDequeueMsg(p->qH, data, dataByteCnt ) != kOkThRC )
  411. return cmErrMsg(&p->err,kQueueFailUdpRC,"Data dequeue failed.");
  412. // if a return buffer was given
  413. if( data != NULL )
  414. {
  415. assert( dataByteCntPtr != NULL );
  416. // the source address is appended to the end of the data
  417. const char* addrPtr = data + availByteCnt - sizeof(*fromAddr);
  418. // copy out the source address
  419. if( fromAddr != NULL )
  420. memcpy(fromAddr,addrPtr,sizeof(*fromAddr));
  421. // subtract the address size from the total msg size
  422. *dataByteCntPtr = availByteCnt - sizeof(*fromAddr);
  423. }
  424. }
  425. return kOkUdpRC;
  426. }
  427. void cmUdpReport( cmUdpH_t h, cmRpt_t* rpt )
  428. {
  429. cmUdp_t* p = _cmUdpHandleToPtr(h);
  430. cmRptPrintf(rpt,"time-out:%i recv:%i queue cb:%i\n",p->timeOutCnt,p->recvCnt,p->queCbCnt);
  431. }
  432. cmUdpRC_t cmUdpInitAddr( cmUdpH_t h, const char* addrStr, cmUdpPort_t portNumber, struct sockaddr_in* retAddrPtr )
  433. {
  434. cmUdp_t* p = _cmUdpHandleToPtr(h);
  435. return _cmUdpInitAddr(p,addrStr,portNumber,retAddrPtr);
  436. }
  437. const cmChar_t* cmUdpAddrToString( cmUdpH_t h, const struct sockaddr_in* addr )
  438. {
  439. cmUdp_t* p = _cmUdpHandleToPtr(h);
  440. _cmUdpClear_errno();
  441. if( inet_ntop(AF_INET, &(addr->sin_addr), p->ntopBuf, INET_ADDRSTRLEN) == NULL)
  442. {
  443. cmErrSysMsg(&p->err,kNtoPFailUdpRC,errno, "Network address to string conversion failed." );
  444. return NULL;
  445. }
  446. p->ntopBuf[INET_ADDRSTRLEN]=0;
  447. return p->ntopBuf;
  448. }
  449. bool cmUdpAddrIsEqual( const struct sockaddr_in* a0, const struct sockaddr_in* a1 )
  450. {
  451. return a0->sin_family == a1->sin_family
  452. && a0->sin_port == a1->sin_port
  453. && memcmp(&a0->sin_addr,&a1->sin_addr,sizeof(a0->sin_addr))==0;
  454. }
  455. const cmChar_t* cmUdpHostName( cmUdpH_t h )
  456. {
  457. cmUdp_t* p = _cmUdpHandleToPtr(h);
  458. _cmUdpClear_errno();
  459. if( gethostname(p->hnameBuf,HOST_NAME_MAX) != 0 )
  460. {
  461. cmErrSysMsg(&p->err,kHostNameFailUdpRC,errno, "gethostname() failed." );
  462. return NULL;
  463. }
  464. p->hnameBuf[HOST_NAME_MAX] = 0;
  465. return p->hnameBuf;
  466. }