src/gromacs/imd/imdsocket.cpp

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  35
  36 /*! \internal \file
  37  *
  38  * \brief
  39  * Implements functions of imdsocket.h.
  40  *
  41  * This file re-implements vmdsock.c functions from original IMD API from scratch,
  42  * see imdsocket.h for references to the IMD API.
  43  *
  44  * \author Martin Hoefling, Carsten Kutzner <ckutzne@gwdg.de>
  45  *
  46  * \ingroup module_imd
  47  */
  48
  49 #include "gmxpre.h"
  50
  51 #include "imdsocket.h"
  52
  53 #include "config.h"
  54
  55 #include <cerrno>
  56 #include <cstring>
  57
  58 #include "gromacs/imd/imd.h"
  59 #include "gromacs/utility/fatalerror.h"
  60 #include "gromacs/utility/smalloc.h"
  61
  62 #if GMX_NATIVE_WINDOWS
  63 #ifdef GMX_HAVE_WINSOCK
  64 /*! \brief Define socklen type on Windows. */
  65 typedef int socklen_t;
  66
  67 /*! \brief Define a function to initialize winsock. */
  68 extern int imdsock_winsockinit()
  69 {
  70     int ret = -1;
  71
  72
  73     WSADATA wsd;
  74
  75     /* We use winsock 1.1 compatibility for now. Though I guess no one will try on Windows 95. */
  76     ret = WSAStartup(MAKEWORD(1, 1), &wsd);
  77     return ret;
  78 }
  79 #endif
  80 #else
  81 /* On UNIX, we can use nice errors from errno.h */
  82 #include <unistd.h>
  83 #ifdef GMX_IMD
  84 #include <ctime>
  85
  86 #include <sys/select.h>
  87 #include <sys/time.h>
  88 #endif
  89 #endif
  90
  91
  92 /*! \brief Simple error handling. */
  93 #if GMX_NATIVE_WINDOWS
  94 #define ERR_ARGS __FILE__, __LINE__, NULL
  95 #else
  96 #define ERR_ARGS __FILE__, __LINE__, strerror(errno)
  97 #endif
  98
  99
 100 /*! \brief Currently only 1 client connection is supported. */
 101 #define MAXIMDCONNECTIONS 1
 102
 103
 104 /*! \brief Print a nice error message on UNIX systems, using errno.h. */
 105 static void print_IMD_error(const char *file, int line, char *msg)
 106 {
 107     fprintf(stderr, "%s Error in file %s on line %d.\n", IMDstr, file, line);
 108
 109     if (nullptr != msg)
 110     {
 111         fprintf(stderr, "%s\n", msg);
 112     }
 113 }
 114
 115
 116 extern IMDSocket* imdsock_create()
 117 {
 118     IMDSocket *sock = nullptr;
 119
 120
 121 #ifdef GMX_IMD
 122     snew(sock, 1);
 123     /* Try to create socket: */
 124     if ((sock->sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
 125     {
 126         print_IMD_error(ERR_ARGS);
 127         sfree(sock);
 128
 129         return nullptr;
 130     }
 131     else
 132 #endif
 133     {
 134         return sock;
 135     }
 136 }
 137
 138
 139 extern int imdsock_bind(IMDSocket *sock, int port)
 140 {
 141     int ret;
 142
 143
 144 #ifdef GMX_IMD
 145     memset(&(sock->address), 0, sizeof(sock->address));
 146     sock->address.sin_family = PF_INET;
 147     sock->address.sin_port   = htons(port);
 148
 149     /* Try to bind to address and port ...*/
 150     ret = bind(sock->sockfd, reinterpret_cast<struct sockaddr *>(&sock->address), sizeof(sock->address));
 151 #else
 152     ret = -1;
 153 #endif
 154
 155     if (ret)
 156     {
 157         print_IMD_error(ERR_ARGS);
 158     }
 159
 160     return ret;
 161 }
 162
 163
 164 extern int imd_sock_listen(IMDSocket *sock)
 165 {
 166     int ret;
 167
 168
 169 #ifdef GMX_IMD
 170     /* Try to set to listening state */
 171     ret = listen(sock->sockfd, MAXIMDCONNECTIONS);
 172 #else
 173     ret = -1;
 174 #endif
 175
 176     if (ret)
 177     {
 178         print_IMD_error(ERR_ARGS);
 179     }
 180
 181     return ret;
 182 }
 183
 184
 185 extern IMDSocket* imdsock_accept(IMDSocket *sock)
 186 {
 187     int       ret;
 188
 189 #ifdef GMX_IMD
 190     socklen_t length;
 191
 192
 193     length = sizeof(sock->address);
 194     ret    = accept(sock->sockfd, reinterpret_cast<struct sockaddr *>(&sock->address), &length);
 195
 196     /* successful, redirect to distinct clientsocket */
 197     if (ret >= 0)
 198     {
 199         IMDSocket *newsock;
 200
 201         snew(newsock, 1);
 202         newsock->address    = sock->address;
 203         newsock->sockfd     = ret;
 204
 205         return newsock;
 206     }
 207     else
 208 #endif
 209     {
 210         print_IMD_error(ERR_ARGS);
 211
 212         return nullptr;
 213     }
 214 }
 215
 216
 217 extern int imdsock_getport(IMDSocket *sock, int *port)
 218 {
 219     int                ret;
 220 #ifdef GMX_IMD
 221     socklen_t          len;
 222
 223
 224     len = sizeof(struct sockaddr_in);
 225     ret = getsockname(sock->sockfd, reinterpret_cast<struct sockaddr *>(&(sock->address)), &len);
 226     if (ret)
 227     {
 228         fprintf(stderr, "%s getsockname failed with error %d.\n", IMDstr, ret);
 229         print_IMD_error(ERR_ARGS);
 230     }
 231     else
 232     {
 233         *port = ntohs(sock->address.sin_port);
 234     }
 235 #else
 236     gmx_incons("imdsock_getport called without IMD support.");
 237     ret = -1;
 238 #endif
 239
 240     return ret;
 241 }
 242
 243
 244 extern int imdsock_write(IMDSocket *sock, const char *buffer, int length)
 245 {
 246     /* No read and write on windows, we have to use send and recv instead... */
 247 #if GMX_NATIVE_WINDOWS
 248 #ifdef GMX_HAVE_WINSOCK
 249     return send(sock->sockfd, (const char *) buffer, length, NOFLAGS);
 250 #else
 251     return -1;
 252 #endif
 253 #else
 254     return write(sock->sockfd, buffer, length);
 255 #endif
 256 }
 257
 258
 259 extern int imdsock_read(IMDSocket *sock, char *buffer, int length)
 260 {
 261     /* See above... */
 262 #if GMX_NATIVE_WINDOWS
 263 #ifdef GMX_HAVE_WINSOCK
 264     return recv(sock->sockfd, (char *) buffer, length, NOFLAGS);
 265 #else
 266     return -1;
 267 #endif
 268 #else
 269     return read(sock->sockfd, buffer, length);
 270 #endif
 271 }
 272
 273
 274 extern void imdsock_shutdown(IMDSocket *sock)
 275 {
 276     int ret = -1;
 277
 278
 279     /* is the socket already NULL? */
 280     if (sock == nullptr)
 281     {
 282         return;
 283     }
 284
 285 #ifdef GMX_IMD
 286     /* If not, try to properly shut down. */
 287     ret = shutdown(sock->sockfd, 1);
 288 #endif
 289
 290     if (ret == -1)
 291     {
 292         fprintf(stderr, "%s Failed to shutdown socket. Did the client already disconnect?\n", IMDstr);
 293         print_IMD_error(ERR_ARGS);
 294     }
 295 }
 296
 297
 298 extern int imdsock_destroy(IMDSocket *sock)
 299 {
 300     int ret = -1;
 301
 302
 303     if (sock == nullptr)
 304     {
 305         return 1;
 306     }
 307
 308 #if GMX_NATIVE_WINDOWS
 309     /* On Windows, this function is called closesocket */
 310 #ifdef GMX_HAVE_WINSOCK
 311     ret = closesocket(sock->sockfd);
 312 #endif
 313 #else
 314     ret = close(sock->sockfd);
 315 #endif
 316
 317     if (ret == -1)
 318     {
 319         sfree(sock);
 320         print_IMD_error(ERR_ARGS);
 321
 322         return 0;
 323     }
 324
 325     return 1;
 326 }
 327
 328
 329 extern int imdsock_tryread(IMDSocket *sock, int timeoutsec, int timeoutusec)
 330 {
 331     int             ret = -1;
 332
 333
 334 #ifdef GMX_IMD
 335     fd_set          readfds;
 336     /* Create new time structure with sec and usec. */
 337     struct timeval *tval;
 338
 339
 340     snew(tval, 1);
 341
 342     /* clear the set */
 343     FD_ZERO(&readfds);
 344     /* add the socket to the read set */
 345     FD_SET(sock->sockfd, &readfds);
 346
 347     /* set the timeout */
 348     tval->tv_sec  = timeoutsec;
 349     tval->tv_usec = timeoutusec;
 350     do
 351     {
 352         /* check the set for read readiness. */
 353         ret = select(sock->sockfd + 1, &readfds, nullptr, nullptr, tval);
 354         /* redo on system interrupt */
 355     }
 356     while (ret < 0 && errno == EINTR);
 357
 358     sfree(tval);
 359 #endif
 360
 361     if (ret < 0)
 362     {
 363         print_IMD_error(ERR_ARGS);
 364     }
 365
 366     return ret;
 367 }