Actual source code: sopen.c
petsc-3.10.5 2019-03-28
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);
76: int SOCKConnect_Private(int portnumber)
77: {
78: struct sockaddr_in isa;
79: #if defined(PETSC_HAVE_ACCEPT_SIZE_T)
80: size_t i;
81: #else
82: int i;
83: #endif
84: int t;
86: /* open port*/
87: listenport = establish((u_short) portnumber);
88: if (listenport == -1) PETSC_MEX_ERRORQ("RECEIVE: unable to establish port\n");
90: /* wait for someone to try to connect */
91: i = sizeof(struct sockaddr_in);
92: if ((t = accept(listenport,(struct sockaddr*)&isa,(socklen_t*)&i)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from accept\n");
93: close(listenport);
94: return(t);
95: }
96: /*-----------------------------------------------------------------*/
97: #define MAXHOSTNAME 100
98: int establish(u_short portnum)
99: {
100: char myname[MAXHOSTNAME+1];
101: int s;
102: struct sockaddr_in sa;
103: struct hostent *hp;
104: #if defined(PETSC_HAVE_UNAME)
105: struct utsname utname;
106: #elif defined(PETSC_HAVE_GETCOMPUTERNAME)
107: int namelen=MAXHOSTNAME;
108: #endif
110: /* Note we do not use gethostname since that is not POSIX */
111: #if defined(PETSC_HAVE_GETCOMPUTERNAME)
112: GetComputerName((LPTSTR)myname,(LPDWORD)&namelen);
113: #elif defined(PETSC_HAVE_UNAME)
114: uname(&utname);
115: strncpy(myname,utname.nodename,MAXHOSTNAME);
116: #endif
117: #if defined(PETSC_HAVE_BZERO)
118: bzero(&sa,sizeof(struct sockaddr_in));
119: #else
120: memset(&sa,0,sizeof(struct sockaddr_in));
121: #endif
122: hp = gethostbyname(myname);
123: if (!hp) PETSC_MEX_ERRORQ("RECEIVE: error from gethostbyname\n");
125: sa.sin_family = hp->h_addrtype;
126: sa.sin_port = htons(portnum);
128: if ((s = socket(AF_INET,SOCK_STREAM,0)) < 0) PETSC_MEX_ERRORQ("RECEIVE: error from socket\n");
130: {
131: int optval = 1; /* Turn on the option */
132: (void) setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char*)&optval,sizeof(optval));
133: }
135: while (bind(s,(struct sockaddr*)&sa,sizeof(sa)) < 0) {
136: #if defined(PETSC_HAVE_WSAGETLASTERROR)
137: PetscErrorCode ierr;
138: WSAGetLastError();
139: if (ierr != WSAEADDRINUSE) {
140: #else
141: if (errno != EADDRINUSE) {
142: #endif
143: close(s);
144: PETSC_MEX_ERRORQ("RECEIVE: error from bind\n");
145: return(-1);
146: }
147: close(listenport);
148: }
149: listen(s,0);
150: return(s);
151: }
153: /*-----------------------------------------------------------------*/
154: /* */
155: /*-----------------------------------------------------------------*/
156: PETSC_EXTERN void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])
157: {
158: int t,portnumber;
160: /* check output parameters */
161: if (nlhs != 1) PETSC_MEX_ERROR("Open requires one output argument.");
163: /* figure out portnumber user wants to use; default to 5005 */
164: if (!nrhs) {
165: char *str;
166: str = getenv("PETSC_VIEWER_SOCKET_PORT");
167: if (str) portnumber = atoi(str);
168: else portnumber = PETSCSOCKETDEFAULTPORT;
169: } else portnumber = (int)*mxGetPr(prhs[0]);
171: /* open connection */
172: t = SOCKConnect_Private(portnumber); if (t == -1) PETSC_MEX_ERROR("opening socket");
174: plhs[0] = mxCreateDoubleMatrix(1,1,mxREAL);
176: *mxGetPr(plhs[0]) = t;
177: return;
178: }
180: int main(int argc, char **argv)
181: {
182: return 0;
183: }