1 mike  1.1.2.2 /*

  2 mike  1.1.2.1 //%2006////////////////////////////////////////////////////////////////////////
  3               //
  4               // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
  5               // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
  6               // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
  7               // IBM Corp.; EMC Corporation, The Open Group.
  8               // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
  9               // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
 10               // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 11               // EMC Corporation; VERITAS Software Corporation; The Open Group.
 12               // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 13               // EMC Corporation; Symantec Corporation; The Open Group.
 14               //
 15               // Permission is hereby granted, free of charge, to any person obtaining a copy
 16               // of this software and associated documentation files (the "Software"), to
 17               // deal in the Software without restriction, including without limitation the
 18               // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 19               // sell copies of the Software, and to permit persons to whom the Software is
 20               // furnished to do so, subject to the following conditions:
 21               // 
 22               // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
 23 mike  1.1.2.1 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
 24               // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 25               // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 26               // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 27               // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28               // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 29               // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 30               //
 31               //%/////////////////////////////////////////////////////////////////////////////

 32 mike  1.1.2.2 */

 33 mike  1.1.2.1 
 34               #ifndef _Executor_Socket_h
 35               #define _Executor_Socket_h
 36               

 37 mike  1.1.2.5 #if !defined(_XOPEN_SOURCE_EXTENDED)
 38               # define _XOPEN_SOURCE_EXTENDED
 39               #endif
 40               

 41 mike  1.1.2.1 #include <stdlib.h>

 42 mike  1.1.2.3 #include "Defines.h"
 43               #include <sys/socket.h>
 44               #include <string.h>

 45 mike  1.1.2.1 

 46 mike  1.1.2.3 EXECUTOR_LINKAGE

 47 mike  1.1.2.1 int SetNonBlocking(int sock);
 48               

 49 mike  1.1.2.3 EXECUTOR_LINKAGE

 50 mike  1.1.2.6 int SetBlocking(int sock);
 51               
 52               EXECUTOR_LINKAGE

 53 mike  1.1.2.1 ssize_t RecvNonBlock(int sock, void* buffer, size_t size);
 54               

 55 mike  1.1.2.3 EXECUTOR_LINKAGE

 56 mike  1.1.2.1 ssize_t SendNonBlock(int sock, const void* buffer, size_t size);
 57               

 58 mike  1.1.2.3 EXECUTOR_LINKAGE

 59 mike  1.1.2.1 int CloseOnExec(int fd);
 60               

 61 mike  1.1.2.3 EXECUTOR_LINKAGE

 62 mike  1.1.2.1 ssize_t SendDescriptorArray(int sock, int descriptors[], size_t count);
 63               

 64 mike  1.1.2.3 EXECUTOR_LINKAGE

 65 mike  1.1.2.1 int CreateSocketPair(int pair[2]);
 66               

 67 mike  1.1.2.3 static int RecvDescriptorArray(int sock, int descriptors[], size_t count)
 68               {
 69                   struct msghdr mh;
 70                   size_t size;
 71                   char* data;
 72                   struct iovec iov[1];
 73                   char dummy;
 74                   ssize_t n;
 75                   struct cmsghdr* cmh = CMSG_FIRSTHDR(&mh);
 76               
 77                   /*
 78                    * This control data begins with a cmsghdr struct followed by the data
 79                    * (a descriptor in this case). The union ensures that the data is 
 80                    * aligned suitably for the leading cmsghdr struct. The descriptor 
 81                    * itself is properly aligned since the cmsghdr ends on a boundary 
 82                    * that is suitably aligned for any type (including int).
 83                    *
 84                    *     ControlData = [ cmsghdr | int ]
 85                    */
 86               
 87                   size = CMSG_SPACE(sizeof(int) * count);
 88 mike  1.1.2.3     data = (char*)malloc(size);
 89               
 90                   /* Define a msghdr that refers to the control data, which is filled in
 91                    * by calling recvmsg() below.
 92                    */
 93               
 94                   memset(&mh, 0, sizeof(mh));
 95                   mh.msg_control = data;
 96                   mh.msg_controllen = size;
 97               
 98                   /*
 99                    * The other process sends a single-byte message. This byte is not
100                    * used since we only need the control data (the descriptor) but we
101                    * must request at least one byte from recvmsg().
102                    */
103               
104                   memset(iov, 0, sizeof(iov));
105               
106                   iov[0].iov_base = &dummy;
107                   iov[0].iov_len = 1;
108                   mh.msg_iov = iov;
109 mike  1.1.2.3     mh.msg_iovlen = 1;
110               
111                   /* Receive the message from the other process. */
112               
113                   n = recvmsg(sock, &mh, 0);
114               
115                   if (n <= 0)
116                       return -1;
117               
118                   /* Get a pointer to control message. Return if the header is null or 
119                    * does not contain what we expect.
120                    */
121               
122                   cmh = CMSG_FIRSTHDR(&mh);
123               
124                   if (!cmh || 
125                       cmh->cmsg_len != CMSG_LEN(sizeof(int) * count) ||
126                       cmh->cmsg_level != SOL_SOCKET ||
127                       cmh->cmsg_type != SCM_RIGHTS)
128                   {
129                       return -1;
130 mike  1.1.2.3     }
131               
132                   /* Copy the data: */
133               
134                   memcpy(descriptors, CMSG_DATA(cmh), sizeof(int) * count);
135               
136                   return 0;
137               }
138               

139 mike  1.1.2.1 #endif /* _Executor_Socket_h */