Actual source code: sopen.c
petsc-3.6.1 2015-08-06
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) {mexErrMsgTxt(a); return;}
64: #define PETSC_MEX_ERRORQ(a) {mexErrMsgTxt(a); return -1;}
66: /*-----------------------------------------------------------------*/
67: /* The listenport variable is an ugly hack. If the user hits a */
68: /* control c while we are listening then we stop listening */
69: /* but do not close the listen. Therefore if we try to bind again */
70: /* and get an address in use, close the listen which was left */
71: /* hanging; the problem is if the user uses several portnumbers */
72: /* and control c we may not be able to close the correct listener. */
73: static int listenport;
74: /*-----------------------------------------------------------------*/
75: extern int establish(u_short);
78: int SOCKConnect_Private(int portnumber)
79: {
80: struct sockaddr_in isa;
81: #if defined(PETSC_HAVE_ACCEPT_SIZE_T)
82: size_t i;
83: #else
84: int i;
85: #endif
86: int t;
88: /* open port*/
89: listenport = establish((u_short) portnumber);
90: if (listenport == -1) PETSC_MEX_ERRORQ("RECEIVE: unable to establish port\n");
92: /* wait for someone to try to connect */
93: i = sizeof(struct sockaddr_in);
94: if ((t = accept(listenport,(struct sockaddr*)&isa,(socklen_t*)&i)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from accept\n");
95: close(listenport);
96: return(t);
97: }
98: /*-----------------------------------------------------------------*/
99: #define MAXHOSTNAME 100
102: int establish(u_short portnum)
103: {
104: char myname[MAXHOSTNAME+1];
105: int s;
106: struct sockaddr_in sa;
107: struct hostent *hp;
108: #if defined(PETSC_HAVE_UNAME)
109: struct utsname utname;
110: #elif defined(PETSC_HAVE_GETCOMPUTERNAME)
111: int namelen=MAXHOSTNAME;
112: #endif
114: /* Note we do not use gethostname since that is not POSIX */
115: #if defined(PETSC_HAVE_GETCOMPUTERNAME)
116: GetComputerName((LPTSTR)myname,(LPDWORD)&namelen);
117: #elif defined(PETSC_HAVE_UNAME)
118: uname(&utname);
119: strncpy(myname,utname.nodename,MAXHOSTNAME);
120: #endif
121: #if defined(PETSC_HAVE_BZERO)
122: bzero(&sa,sizeof(struct sockaddr_in));
123: #else
124: memset(&sa,0,sizeof(struct sockaddr_in));
125: #endif
126: hp = gethostbyname(myname);
127: if (!hp) PETSC_MEX_ERRORQ("RECEIVE: error from gethostbyname\n");
129: sa.sin_family = hp->h_addrtype;
130: sa.sin_port = htons(portnum);
132: if ((s = socket(AF_INET,SOCK_STREAM,0)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from socket\n");
134: {
135: int optval = 1; /* Turn on the option */
136: (void) setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char*)&optval,sizeof(optval));
137: }
139: while (bind(s,(struct sockaddr*)&sa,sizeof(sa)) < 0) {
140: #if defined(PETSC_HAVE_WSAGETLASTERROR)
141: PetscErrorCode ierr;
142: WSAGetLastError();
143: if (ierr != WSAEADDRINUSE) {
144: #else
145: if (errno != EADDRINUSE) {
146: #endif
147: close(s);
148: PETSC_MEX_ERRORQ("RECEIVE: error from bind\n");
149: return(-1);
150: }
151: close(listenport);
152: }
153: listen(s,0);
154: return(s);
155: }
157: /*-----------------------------------------------------------------*/
158: /* */
159: /*-----------------------------------------------------------------*/
162: void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])
163: {
164: int t,portnumber;
166: /* check output parameters */
167: if (nlhs != 1) PETSC_MEX_ERROR("Open requires one output argument.");
169: /* figure out portnumber user wants to use; default to 5005 */
170: if (!nrhs) {
171: char *str;
172: str = getenv("PETSC_VIEWER_SOCKET_PORT");
173: if (str) portnumber = atoi(str);
174: else portnumber = PETSCSOCKETDEFAULTPORT;
175: } else portnumber = (int)*mxGetPr(prhs[0]);
177: /* open connection */
178: t = SOCKConnect_Private(portnumber); if (t == -1) PETSC_MEX_ERROR("opening socket");
180: plhs[0] = mxCreateDoubleMatrix(1,1,mxREAL);
182: *mxGetPr(plhs[0]) = t;
183: return;
184: }