Actual source code: openport.c

  1: /* 
  2:   Usage: A = openport(portnumber);  [ 5000 < portnumber < 5010 ]
  3:  
  4:         Written by Barry Smith, bsmith@mcs.anl.gov 4/14/92
  5:          Updated by Ridhard Katz, katz@ldeo.columbia.edu 9/28/03

  7:    This code has not been tested on all machines, the function prototypes may not
  8: exist for certain systems. Only compiles as C code.
  9: */

 11:  #include petsc.h
 12:  #include petscsys.h

 14: #if defined(PETSC_NEEDS_UTYPE_TYPEDEFS)
 15: /* Some systems have inconsistent include files that use but don't
 16:    ensure that the following definitions are made */
 17: typedef unsigned char   u_char;
 18: typedef unsigned short  u_short;
 19: typedef unsigned int    u_int;
 20: typedef unsigned long   u_long;
 21: #endif

 23: #include <errno.h>
 24: #if defined(PETSC_HAVE_STDLIB_H)
 25: #include <stdlib.h>
 26: #endif
 27: #include <sys/types.h>
 28: #include <ctype.h>
 29: #if defined(PETSC_HAVE_MACHINE_ENDIAN_H)
 30: #include <machine/endian.h>
 31: #endif
 32: #if defined(PETSC_HAVE_UNISTD_H)
 33: #include <unistd.h>
 34: #endif
 35: #if defined(PETSC_HAVE_SYS_SOCKET_H)
 36: #include <sys/socket.h>
 37: #endif
 38: #if defined(PETSC_HAVE_SYS_WAIT_H)
 39: #include <sys/wait.h>
 40: #endif
 41: #if defined(PETSC_HAVE_NETINET_IN_H)
 42: #include <netinet/in.h>
 43: #endif
 44: #if defined(PETSC_HAVE_NETDB_H)
 45: #include <netdb.h>
 46: #endif
 47: #if defined(PETSC_HAVE_FCNTL_H)
 48: #include <fcntl.h>
 49: #endif
 50: #if defined(PETSC_HAVE_STROPTS_H)
 51: #include <stropts.h>
 52: #endif
 53: #if defined (PETSC_HAVE_IO_H)
 54: #include <io.h>
 55: #endif
 56: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
 57: #include <sys/utsname.h>
 58: #endif
 59: #if defined(PETSC_HAVE_STRINGS_H)
 60: #include <strings.h>
 61: #endif
 62: #if defined(PETSC_HAVE_STRING_H)
 63: #include <string.h>
 64: #endif
 65: #if defined(PETSC_HAVE_WINSOCK2_H)
 66: #include <Winsock2.h>
 67: #endif
 68: #if defined(PETSC_HAVE_WS2TCPIP_H)
 69: #include <Ws2tcpip.h>
 70: #endif
 71:  #include src/sys/src/viewer/impls/socket/socket.h
 72: #include "petscfix.h"
 73: #include "mex.h"

 75: EXTERN PetscErrorCode SOCKConnect_Private(int);
 76: #define PETSC_MEX_ERROR(a) {fprintf(stdout,"OPENPORT: %s \n",a); return ;}
 77: /*-----------------------------------------------------------------*/
 78: /*                                                                 */
 79: /*-----------------------------------------------------------------*/
 82: void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])
 83: {
 84:   int t,portnumber;

 86:   /* check output parameters */
 87:   if (nlhs != 1) PETSC_MEX_ERROR("Open requires one output argument.");

 89:   /* figure out portnumber user wants to use; default to 5005 */
 90:   if (!nrhs) {
 91:     char *str;
 92:     str = getenv("PETSC_VIEWER_SOCKET_PORT");
 93:     if (str) portnumber = atoi(str);
 94:     else portnumber = DEFAULTPORT;
 95:   } else {
 96:     portnumber = (int)*mxGetPr(prhs[0]);
 97:   }

 99:   /* open connection */
100:   t = SOCKConnect_Private(portnumber); if (t == -1)  PETSC_MEX_ERROR("opening socket");

102:   plhs[0]  = mxCreateDoubleMatrix(1,1,mxREAL);
103: 
104:   *mxGetPr(plhs[0]) = t;
105:   return;
106: }

108: /*-----------------------------------------------------------------*/
109: /* The listenport variable is an ugly hack. If the user hits a         */
110: /* control c while we are listening then we stop listening         */
111: /* but do not close the listen. Therefore if we try to bind again  */
112: /* and get an address in use, close the listen which was left      */
113: /* hanging; the problem is if the user uses several portnumbers    */
114: /* and control c we may not be able to close the correct listener. */
115: static int listenport;
116: /*-----------------------------------------------------------------*/
120: PetscErrorCode SOCKConnect_Private(int portnumber)
121: {
122:   struct sockaddr_in isa;
123: #if defined(PETSC_HAVE_ACCEPT_SIZE_T)
124:   size_t             i;
125: #else
126:   int                i;
127: #endif
128:   int                t;

130: /* open port*/
131:   listenport = establish((u_short) portnumber);
132:   if (listenport == -1) {
133:        fprintf(stdout,"RECEIVE: unable to establish port\n");
134:        return -1;
135:   }

137: /* wait for someone to try to connect */
138:   i = sizeof(struct sockaddr_in);
139:   if ((t = accept(listenport,(struct sockaddr *)&isa,(socklen_t *)&i)) < 0) {
140:      fprintf(stdout,"RECEIVE: error from accept\n");
141:      return(-1);
142:   }
143:   close(listenport);
144:   return(t);
145: }
146: /*-----------------------------------------------------------------*/
147: #define MAXHOSTNAME 100
150: PetscErrorCode establish(u_short portnum)
151: {
152:   char               myname[MAXHOSTNAME+1];
153:   int                s;
154:   PetscErrorCode     ierr;
155:   struct sockaddr_in sa;
156:   struct hostent     *hp;
157: #if defined(PETSC_HAVE_UNAME)
158:   struct utsname     utname;
159: #elif defined(PETSC_HAVE_GETCOMPUTERNAME)
160:   int                namelen=MAXHOSTNAME;
161: #endif

163:   /* Note we do not use gethostname since that is not POSIX */
164: #if defined(PETSC_HAVE_GETCOMPUTERNAME)
165:   GetComputerName((LPTSTR)myname,(LPDWORD)&namelen);
166: #elif defined(PETSC_HAVE_UNAME)
167:   uname(&utname);
168:   strncpy(myname,utname.nodename,MAXHOSTNAME);
169: #endif
170: #if defined(PETSC_HAVE_BZERO)
171:   bzero(&sa,sizeof(struct sockaddr_in));
172: #else
173:   memset(&sa,0,sizeof(struct sockaddr_in));
174: #endif
175:   hp = gethostbyname(myname);
176:   if (!hp) {
177:      fprintf(stdout,"RECEIVE: error from gethostbyname\n");
178:      return(-1);
179:   }

181:   sa.sin_family = hp->h_addrtype;
182:   sa.sin_port = htons(portnum);

184:   if ((s = socket(AF_INET,SOCK_STREAM,0)) < 0) {
185:      fprintf(stdout,"RECEIVE: error from socket\n");
186:      return(-1);
187:   }
188:   {
189:   int optval = 1; /* Turn on the option */
190:   setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&optval,sizeof(optval));
191:   }

193:   while (bind(s,(struct sockaddr*)&sa,sizeof(sa)) < 0) {
194: #if defined(PETSC_HAVE_WSAGETLASTERROR)
195:     WSAGetLastError();
196:     if (ierr != WSAEADDRINUSE) {
197: #else
198:     if (errno != EADDRINUSE) {
199: #endif
200:       close(s);
201:       fprintf(stdout,"RECEIVE: error from bind\n");
202:       return(-1);
203:     }
204:     close(listenport);
205:   }
206:   listen(s,0);
207:   return(s);
208: }