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39 * Implements functions of imdsocket.h.
41 * This file re-implements vmdsock.c functions from original IMD API from scratch,
42 * see imdsocket.h for references to the IMD API.
44 * \author Martin Hoefling, Carsten Kutzner <ckutzne@gwdg.de>
51 #include "imdsocket.h"
58 #include "gromacs/imd/imd.h"
59 #include "gromacs/utility/fatalerror.h"
60 #include "gromacs/utility/smalloc.h"
62 #ifdef GMX_NATIVE_WINDOWS
63 #ifdef GMX_HAVE_WINSOCK
64 /*! \brief Define socklen type on Windows. */
65 typedef int socklen_t;
67 /*! \brief Define a function to initialize winsock. */
68 extern int imdsock_winsockinit()
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);
81 /* On UNIX, we can use nice errors from errno.h */
86 /*! \brief Simple error handling. */
87 #ifdef GMX_NATIVE_WINDOWS
88 #define ERR_ARGS __FILE__, __LINE__, NULL
90 #define ERR_ARGS __FILE__, __LINE__, strerror(errno)
94 /*! \brief Currently only 1 client connection is supported. */
95 #define MAXIMDCONNECTIONS 1
98 /*! \brief Print a nice error message on UNIX systems, using errno.h. */
99 static void print_IMD_error(char *file, int line, char *msg)
101 fprintf(stderr, "%s Error in file %s on line %d.\n", IMDstr, file, line);
105 fprintf(stderr, "%s\n", msg);
110 extern IMDSocket* imdsock_create()
112 IMDSocket *sock = NULL;
117 /* Try to create socket: */
118 if ((sock->sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
120 print_IMD_error(ERR_ARGS);
133 extern int imdsock_bind(IMDSocket *sock, int port)
139 memset(&(sock->address), 0, sizeof(sock->address));
140 sock->address.sin_family = PF_INET;
141 sock->address.sin_port = htons(port);
143 /* Try to bind to address and port ...*/
144 ret = bind(sock->sockfd, (struct sockaddr *) &sock->address, sizeof(sock->address));
151 print_IMD_error(ERR_ARGS);
158 extern int imd_sock_listen(IMDSocket *sock)
164 /* Try to set to listening state */
165 ret = listen(sock->sockfd, MAXIMDCONNECTIONS);
172 print_IMD_error(ERR_ARGS);
179 extern IMDSocket* imdsock_accept(IMDSocket *sock)
187 length = sizeof(sock->address);
188 ret = accept(sock->sockfd, (struct sockaddr *) &sock->address, &length);
190 /* successful, redirect to distinct clientsocket */
196 newsock->address = sock->address;
197 newsock->sockfd = ret;
204 print_IMD_error(ERR_ARGS);
211 extern int imdsock_getport(IMDSocket *sock, int *port)
215 struct sockaddr_in sin;
220 ret = getsockname(sock->sockfd, (struct sockaddr *) &(sock->address), &len);
223 fprintf(stderr, "%s getsockname failed with error %d.\n", IMDstr, ret);
224 print_IMD_error(ERR_ARGS);
228 *port = ntohs(sock->address.sin_port);
231 gmx_incons("imdsock_getport called without IMD support.");
238 extern int imdsock_write(IMDSocket *sock, const char *buffer, int length)
240 /* No read and write on windows, we have to use send and recv instead... */
241 #ifdef GMX_NATIVE_WINDOWS
242 #ifdef GMX_HAVE_WINSOCK
243 return send(sock->sockfd, (const char *) buffer, length, NOFLAGS);
248 return write(sock->sockfd, buffer, length);
253 extern int imdsock_read(IMDSocket *sock, char *buffer, int length)
256 #ifdef GMX_NATIVE_WINDOWS
257 #ifdef GMX_HAVE_WINSOCK
258 return recv(sock->sockfd, (char *) buffer, length, NOFLAGS);
263 return read(sock->sockfd, buffer, length);
268 extern void imdsock_shutdown(IMDSocket *sock)
273 /* is the socket already NULL? */
280 /* If not, try to properly shut down. */
281 ret = shutdown(sock->sockfd, 1);
286 fprintf(stderr, "%s Failed to shutdown socket. Did the client already disconnect?\n", IMDstr);
287 print_IMD_error(ERR_ARGS);
292 extern int imdsock_destroy(IMDSocket *sock)
302 #ifdef GMX_NATIVE_WINDOWS
303 /* On Windows, this function is called closesocket */
304 #ifdef GMX_HAVE_WINSOCK
305 ret = closesocket(sock->sockfd);
308 ret = close(sock->sockfd);
314 print_IMD_error(ERR_ARGS);
323 extern int imdsock_tryread(IMDSocket *sock, int timeoutsec, int timeoutusec)
330 /* Create new time structure with sec and usec. */
331 struct timeval *tval;
338 /* add the socket to the read set */
339 FD_SET(sock->sockfd, &readfds);
341 /* set the timeout */
342 tval->tv_sec = timeoutsec;
343 tval->tv_usec = timeoutusec;
346 /* check the set for read readiness. */
347 ret = select(sock->sockfd + 1, &readfds, NULL, NULL, tval);
348 /* redo on system interrupt */
350 while (ret < 0 && errno == EINTR);
357 print_IMD_error(ERR_ARGS);