Date: 2025-03-28T21:11:10+00:00

Actual source code: sopen.c

      1: /*
      2:   Usage: A = sopen(portnumber);  [ 5000 < portnumber < 5010 ]

      4:         Written by Barry Smith, bsmith@mcs.anl.gov 4/14/92
      5:         Updated by Richard Katz, katz@ldeo.columbia.edu 9/28/03
      6:         Updated by Barry Smith, bsmith@mcs.anl.gov 8/11/06

      8:  Similar to MATLAB's sopen() only does not take file name, instead optional
      9:  port to listen at.

     11:  Only compiles as C code.
     12: */

     14: #include <petscsys.h>

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

     25: #include <errno.h>
     26: #include <ctype.h>
     27: #if defined(PETSC_HAVE_MACHINE_ENDIAN_H)
     28:   #include <machine/endian.h>
     29: #endif
     30: #if defined(PETSC_HAVE_UNISTD_H)
     31:   #include <unistd.h>
     32: #endif
     33: #if defined(PETSC_HAVE_SYS_SOCKET_H)
     34:   #include <sys/socket.h>
     35: #endif
     36: #if defined(PETSC_HAVE_SYS_WAIT_H)
     37:   #include <sys/wait.h>
     38: #endif
     39: #if defined(PETSC_HAVE_NETINET_IN_H)
     40:   #include <netinet/in.h>
     41: #endif
     42: #if defined(PETSC_HAVE_NETDB_H)
     43:   #include <netdb.h>
     44: #endif
     45: #if defined(PETSC_HAVE_FCNTL_H)
     46:   #include <fcntl.h>
     47: #endif
     48: #if defined(PETSC_HAVE_IO_H)
     49:   #include <io.h>
     50: #endif
     51: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
     52:   #include <sys/utsname.h>
     53: #endif
     54: #if defined(PETSC_HAVE_WINSOCK2_H)
     55:   #include <Winsock2.h>
     56: #endif
     57: #if defined(PETSC_HAVE_WS2TCPIP_H)
     58:   #include <Ws2tcpip.h>
     59: #endif
     60: #include <../src/sys/classes/viewer/impls/socket/socket.h>
     61: #include <mex.h>

     63: #define PETSC_MEX_ERROR(a) \
     64:   { \
     65:     mexErrMsgTxt(a); \
     66:     return; \
     67:   }
     68: #define PETSC_MEX_ERRORQ(a) \
     69:   { \
     70:     mexErrMsgTxt(a); \
     71:     return -1; \
     72:   }

     74: /*-----------------------------------------------------------------*/
     75: /* The listenport variable is an ugly hack. If the user hits a         */
     76: /* control c while we are listening then we stop listening         */
     77: /* but do not close the listen. Therefore if we try to bind again  */
     78: /* and get an address in use, close the listen which was left      */
     79: /* hanging; the problem is if the user uses several portnumbers    */
     80: /* and control c we may not be able to close the correct listener. */
     81: static int listenport;
     82: /*-----------------------------------------------------------------*/
     83: extern int establish(u_short);
     84: static int SOCKConnect_Private(int portnumber)
     85: {
     86:   struct sockaddr_in isa;
     87: #if defined(PETSC_HAVE_ACCEPT_SIZE_T)
     88:   size_t i;
     89: #else
     90:   int i;
     91: #endif
     92:   int t;

     94:   /* open port*/
     95:   listenport = establish((u_short)portnumber);
     96:   if (listenport == -1) PETSC_MEX_ERRORQ("RECEIVE: unable to establish port\n");

     98:   /* wait for someone to try to connect */
     99:   i = sizeof(struct sockaddr_in);
    100:   if ((t = accept(listenport, (struct sockaddr *)&isa, (socklen_t *)&i)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from accept\n");
    101:   close(listenport);
    102:   return t;
    103: }
    104: /*-----------------------------------------------------------------*/
    105: #define MAXHOSTNAME 100
    106: int establish(u_short portnum)
    107: {
    108:   char               myname[MAXHOSTNAME + 1];
    109:   int                s;
    110:   struct sockaddr_in sa;
    111:   struct hostent    *hp;
    112: #if defined(PETSC_HAVE_UNAME)
    113:   struct utsname utname;
    114: #elif defined(PETSC_HAVE_GETCOMPUTERNAME)
    115:   int namelen = MAXHOSTNAME;
    116: #endif

    118:   /* Note we do not use gethostname since that is not POSIX */
    119: #if defined(PETSC_HAVE_GETCOMPUTERNAME)
    120:   GetComputerName((LPTSTR)myname, (LPDWORD)&namelen);
    121: #elif defined(PETSC_HAVE_UNAME)
    122:   uname(&utname);
    123:   strncpy(myname, utname.nodename, MAXHOSTNAME);
    124: #endif
    125: #if defined(PETSC_HAVE_BZERO)
    126:   bzero(&sa, sizeof(struct sockaddr_in));
    127: #else
    128:   memset(&sa, 0, sizeof(struct sockaddr_in));
    129: #endif
    130:   hp = gethostbyname(myname);
    131:   if (!hp) PETSC_MEX_ERRORQ("RECEIVE: error from gethostbyname\n");

    133:   sa.sin_family = hp->h_addrtype;
    134:   sa.sin_port   = htons(portnum);

    136:   if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from socket\n");

    138:   {
    139:     int optval = 1; /* Turn on the option */
    140:     (void)setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&optval, sizeof(optval));
    141:   }

    143:   while (bind(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
    144: #if defined(PETSC_HAVE_WSAGETLASTERROR)
    145:     PetscErrorCode ierr;
    146:     ierr = WSAGetLastError();
    147:     if (ierr != WSAEADDRINUSE) {
    148: #else
    149:     if (errno != EADDRINUSE) {
    150: #endif
    151:       close(s);
    152:       PETSC_MEX_ERRORQ("RECEIVE: error from bind\n");
    153:       return -1;
    154:     }
    155:     close(listenport);
    156:   }
    157:   listen(s, 0);
    158:   return s;
    159: }

    161: PETSC_EXTERN void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
    162: {
    163:   int t, portnumber;

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

    168:   /* figure out portnumber user wants to use; default to 5005 */
    169:   if (!nrhs) {
    170:     char *str;
    171:     str = getenv("PETSC_VIEWER_SOCKET_PORT");
    172:     if (str) portnumber = atoi(str);
    173:     else portnumber = PETSCSOCKETDEFAULTPORT;
    174:   } else portnumber = (int)*mxGetPr(prhs[0]);

    176:   /* open connection */
    177:   t = SOCKConnect_Private(portnumber);
    178:   if (t == -1) PETSC_MEX_ERROR("opening socket");

    180:   plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);

    182:   *mxGetPr(plhs[0]) = t;
    183:   return;
    184: }

    186: int main(int argc, char **argv)
    187: {
    188:   return 0;
    189: }