scheduler/client.c

   1 /*
   2  * Client part of the client/server communication
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <errno.h>
  11 #include <fcntl.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #ifdef HAVE_SYS_SOCKET_H
  16 # include <sys/socket.h>
  17 #endif
  18 #ifdef HAVE_SYS_MMAN_H
  19 #include <sys/mman.h>
  20 #endif
  21 #include <sys/uio.h>
  22 #include <unistd.h>
  23 #include <stdarg.h>
  24
  25 #include "process.h"
  26 #include "thread.h"
  27 #include "server.h"
  28 #include "winerror.h"
  29
  30 /* Some versions of glibc don't define this */
  31 #ifndef SCM_RIGHTS
  32 #define SCM_RIGHTS 1
  33 #endif
  34
  35 /* data structure used to pass an fd with sendmsg/recvmsg */
  36 struct cmsg_fd
  37 {
  38     int len;   /* sizeof structure */
  39     int level; /* SOL_SOCKET */
  40     int type;  /* SCM_RIGHTS */
  41     int fd;    /* fd to pass */
  42 };
  43
  44 /***********************************************************************
  45  *           CLIENT_Die
  46  *
  47  * Die on protocol errors or socket close
  48  */
  49 static void CLIENT_Die(void)
  50 {
  51     close( NtCurrentTeb()->socket );
  52     SYSDEPS_ExitThread();
  53 }
  54
  55 /***********************************************************************
  56  *           server_protocol_error
  57  */
  58 void server_protocol_error( const char *err, ... )
  59 {
  60     va_list args;
  61
  62     va_start( args, err );
  63     fprintf( stderr, "Client protocol error:%p: ", NtCurrentTeb()->tid );
  64     vfprintf( stderr, err, args );
  65     va_end( args );
  66     CLIENT_Die();
  67 }
  68
  69
  70 /***********************************************************************
  71  *           server_perror
  72  */
  73 static void server_perror( const char *err )
  74 {
  75     fprintf( stderr, "Client protocol error:%p: ", NtCurrentTeb()->tid );
  76     perror( err );
  77     CLIENT_Die();
  78 }
  79
  80
  81 /***********************************************************************
  82  *           send_request
  83  *
  84  * Send a request to the server.
  85  */
  86 static void send_request( enum request req )
  87 {
  88     int ret;
  89     if ((ret = write( NtCurrentTeb()->socket, &req, sizeof(req) )) == sizeof(req))
  90         return;
  91     if (ret == -1)
  92     {
  93         if (errno == EPIPE) CLIENT_Die();
  94         server_perror( "sendmsg" );
  95     }
  96     server_protocol_error( "partial msg sent %d/%d\n", ret, sizeof(req) );
  97 }
  98
  99 /***********************************************************************
 100  *           send_request_fd
 101  *
 102  * Send a request to the server, passing a file descriptor.
 103  */
 104 static void send_request_fd( enum request req, int fd )
 105 {
 106     int ret;
 107 #ifndef HAVE_MSGHDR_ACCRIGHTS
 108     struct cmsg_fd cmsg;
 109 #endif
 110     struct msghdr msghdr;
 111     struct iovec vec;
 112
 113     vec.iov_base = (void *)&req;
 114     vec.iov_len  = sizeof(req);
 115
 116     msghdr.msg_name    = NULL;
 117     msghdr.msg_namelen = 0;
 118     msghdr.msg_iov     = &vec;
 119     msghdr.msg_iovlen  = 1;
 120
 121 #ifdef HAVE_MSGHDR_ACCRIGHTS
 122     msghdr.msg_accrights    = (void *)&fd;
 123     msghdr.msg_accrightslen = sizeof(fd);
 124 #else  /* HAVE_MSGHDR_ACCRIGHTS */
 125     cmsg.len   = sizeof(cmsg);
 126     cmsg.level = SOL_SOCKET;
 127     cmsg.type  = SCM_RIGHTS;
 128     cmsg.fd    = fd;
 129     msghdr.msg_control    = &cmsg;
 130     msghdr.msg_controllen = sizeof(cmsg);
 131     msghdr.msg_flags      = 0;
 132 #endif  /* HAVE_MSGHDR_ACCRIGHTS */
 133
 134     if ((ret = sendmsg( NtCurrentTeb()->socket, &msghdr, 0 )) == sizeof(req)) return;
 135     if (ret == -1)
 136     {
 137         if (errno == EPIPE) CLIENT_Die();
 138         server_perror( "sendmsg" );
 139     }
 140     server_protocol_error( "partial msg sent %d/%d\n", ret, sizeof(req) );
 141 }
 142
 143 /***********************************************************************
 144  *           wait_reply
 145  *
 146  * Wait for a reply from the server.
 147  */
 148 static unsigned int wait_reply(void)
 149 {
 150     int ret;
 151     unsigned int res;
 152
 153     for (;;)
 154     {
 155         if ((ret = read( NtCurrentTeb()->socket, &res, sizeof(res) )) == sizeof(res))
 156             return res;
 157         if (ret == -1)
 158         {
 159             if (errno == EINTR) continue;
 160             if (errno == EPIPE) CLIENT_Die();
 161             server_perror("read");
 162         }
 163         if (!ret) CLIENT_Die(); /* the server closed the connection; time to die... */
 164         server_protocol_error( "partial msg received %d/%d\n", ret, sizeof(res) );
 165     }
 166 }
 167
 168
 169 /***********************************************************************
 170  *           wait_reply_fd
 171  *
 172  * Wait for a reply from the server, when a file descriptor is passed.
 173  */
 174 static unsigned int wait_reply_fd( int *fd )
 175 {
 176     struct iovec vec;
 177     int ret;
 178     unsigned int res;
 179
 180 #ifdef HAVE_MSGHDR_ACCRIGHTS
 181     struct msghdr msghdr;
 182
 183     *fd = -1;
 184     msghdr.msg_accrights    = (void *)fd;
 185     msghdr.msg_accrightslen = sizeof(*fd);
 186 #else  /* HAVE_MSGHDR_ACCRIGHTS */
 187     struct msghdr msghdr;
 188     struct cmsg_fd cmsg;
 189
 190     cmsg.len   = sizeof(cmsg);
 191     cmsg.level = SOL_SOCKET;
 192     cmsg.type  = SCM_RIGHTS;
 193     cmsg.fd    = -1;
 194     msghdr.msg_control    = &cmsg;
 195     msghdr.msg_controllen = sizeof(cmsg);
 196     msghdr.msg_flags      = 0;
 197 #endif  /* HAVE_MSGHDR_ACCRIGHTS */
 198
 199     msghdr.msg_name    = NULL;
 200     msghdr.msg_namelen = 0;
 201     msghdr.msg_iov     = &vec;
 202     msghdr.msg_iovlen  = 1;
 203     vec.iov_base = (void *)&res;
 204     vec.iov_len  = sizeof(res);
 205
 206     for (;;)
 207     {
 208         if ((ret = recvmsg( NtCurrentTeb()->socket, &msghdr, 0 )) == sizeof(res))
 209         {
 210 #ifndef HAVE_MSGHDR_ACCRIGHTS
 211             *fd = cmsg.fd;
 212 #endif
 213             return res;
 214         }
 215         if (ret == -1)
 216         {
 217             if (errno == EINTR) continue;
 218             if (errno == EPIPE) CLIENT_Die();
 219             server_perror("recvmsg");
 220         }
 221         if (!ret) CLIENT_Die(); /* the server closed the connection; time to die... */
 222         server_protocol_error( "partial seq received %d/%d\n", ret, sizeof(res) );
 223     }
 224 }
 225
 226
 227 /***********************************************************************
 228  *           server_call_noerr
 229  *
 230  * Perform a server call.
 231  */
 232 unsigned int server_call_noerr( enum request req )
 233 {
 234     send_request( req );
 235     return wait_reply();
 236 }
 237
 238
 239 /***********************************************************************
 240  *           server_call_fd
 241  *
 242  * Perform a server call, passing a file descriptor.
 243  * If *fd is != -1, it will be passed to the server.
 244  * If the server passes an fd, it will be stored into *fd.
 245  */
 246 unsigned int server_call_fd( enum request req, int fd_out, int *fd_in )
 247 {
 248     unsigned int res;
 249
 250     if (fd_out == -1) send_request( req );
 251     else send_request_fd( req, fd_out );
 252
 253     if (fd_in) res = wait_reply_fd( fd_in );
 254     else res = wait_reply();
 255     if (res) SetLastError( res );
 256     return res;  /* error code */
 257 }
 258
 259
 260 /***********************************************************************
 261  *           CLIENT_InitServer
 262  *
 263  * Start the server and create the initial socket pair.
 264  */
 265 int CLIENT_InitServer(void)
 266 {
 267     int fd[2];
 268     char buffer[16];
 269     extern void create_initial_thread( int fd );
 270
 271     if (socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) == -1)
 272     {
 273         perror("socketpair");
 274         exit(1);
 275     }
 276     switch(fork())
 277     {
 278     case -1:  /* error */
 279         perror("fork");
 280         exit(1);
 281     case 0:  /* child */
 282         close( fd[1] );
 283         fcntl( fd[0], F_SETFD, 1 ); /* set close on exec flag */
 284         break;
 285     default:  /* parent */
 286         close( fd[0] );
 287         sprintf( buffer, "%d", fd[1] );
 288         execl( BINDIR "/wineserver", "wineserver", buffer, NULL );
 289         execlp( "wineserver", "wineserver", buffer, NULL );
 290         execl( "./server/wineserver", "wineserver", buffer, NULL );
 291         create_initial_thread( fd[1] );
 292         exit(0);
 293     }
 294     return fd[0];
 295 }
 296
 297
 298 /***********************************************************************
 299  *           CLIENT_InitThread
 300  *
 301  * Send an init thread request. Return 0 if OK.
 302  */
 303 int CLIENT_InitThread(void)
 304 {
 305     struct init_thread_request *req;
 306     TEB *teb = NtCurrentTeb();
 307     int fd;
 308
 309     if (wait_reply_fd( &fd ) || (fd == -1))
 310         server_protocol_error( "no fd passed on first request\n" );
 311     if ((teb->buffer_size = lseek( fd, 0, SEEK_END )) == -1) server_perror( "lseek" );
 312     teb->buffer = mmap( 0, teb->buffer_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
 313     close( fd );
 314     if (teb->buffer == (void*)-1) server_perror( "mmap" );
 315
 316     req = get_req_buffer();
 317     req->unix_pid = getpid();
 318     req->teb      = teb;
 319     if (server_call( REQ_INIT_THREAD )) return -1;
 320     teb->process->server_pid = req->pid;
 321     teb->tid = req->tid;
 322     return 0;
 323 }
 324
 325
 326 /***********************************************************************
 327  *           CLIENT_SetDebug
 328  *
 329  * Send a set debug level request. Return 0 if OK.
 330  */
 331 int CLIENT_SetDebug( int level )
 332 {
 333     struct set_debug_request *req = get_req_buffer();
 334     req->level = level;
 335     return server_call( REQ_SET_DEBUG );
 336 }
 337
 338 /***********************************************************************
 339  *           CLIENT_DebuggerRequest
 340  *
 341  * Send a debugger support request. Return 0 if OK.
 342  */
 343 int CLIENT_DebuggerRequest( int op )
 344 {
 345     struct debugger_request *req = get_req_buffer();
 346     req->op = op;
 347     return server_call( REQ_DEBUGGER );
 348 }
 349