C Socket Programming Tutorial                            SHARE Session 5959
                       Writing Client/Server Programs in C
                       Writing Client/Server Programs in C
                             Using Sockets (A Tutorial)
                             Using Sockets (A Tutorial)
                                       Part II
                                       Part II
                                    Session 5959
                                    Session 5959
                                   Greg Granger
                                    Greg Granger
                                  grgran@sas.com
                                  grgran@sas.com
                               SAS/C & C++ Support
                               SAS/C & C++ Support
                                   SAS  Institute
                                   SAS  Institute
                                      Cary, NC
                                      Cary, NC
      SAS  Institute Inc                                                 Slide 1
      SAS  Institute Inc         SAS/C & C++ Compiler R&D
         Cary, NC
         Cary, NC                                                       Feb 1998
       C Socket Programming Tutorial                            SHARE Session 5959
            Remote Execution Sample Program
            Remote Execution Sample Program
       
 Remote Execution Connection Diagram
       
 Remote Execution Connection Diagram
       
 getservbyname() coding
       
 getservbyname() coding
       
 rexec() function declaration
       
 rexec() function declaration
       
 gethostbyname() and struct hostent
       
 gethostbyname() and struct hostent
       
 rexec() caller source code examination
       
 rexec() caller source code examination
       
 System call return conventions
       
 System call return conventions
       
 Socket address structures and conventions
       
 Socket address structures and conventions
       
 recv() and send() conventions
       
 recv() and send() conventions
       
 File descriptor sets and select()
       
 File descriptor sets and select()
      SAS  Institute Inc                                                 Slide 2
      SAS  Institute Inc         SAS/C & C++ Compiler R&D
         Cary, NC
         Cary, NC                                                       Feb 1998
       C Socket Programming Tutorial                                SHARE Session 5959
          Remote Execution Connection Diagram
          Remote Execution Connection Diagram
               Client issues:
               rexec server.unx mark mypass ls -l
                                               server.unx
          host.mvs                             server.unx
          host.mvs
                                                                  
                                                  stdout          
                                     Primary      stdout
                                     Primary                 exec cmd
                                     Socket                  exec cmd
                rexeccmd             Socket
                rexeccmd                                       (ls -l)
                                                  stdin        (ls -l)
                         rexec
                         rexec
                                                               stderr (pipe)
                                                               stderr (pipe)
                                    Secondary
                                    Secondary
                                     Socket
                                      Socket                  rexecd
                                                              rexecd
                                                                 
                                                                 
       SAS  Institute Inc                                                    Slide 3
       SAS  Institute Inc          SAS/C & C++ Compiler R&D
          Cary, NC
          Cary, NC                                                          Feb 1998
       C Socket Programming Tutorial                               SHARE Session 5959
                      REXEC Initial Connection
                      REXEC Initial Connection
          host.mvs                            server.unx
          host.mvs                            server.unx
                                                   inetd
                rexeccmd                           inetd
                rexeccmd
                                     Primary
                        rexec        Primary
                        rexec                      rexecd
                                     Socket        rexecd
                                     Socket
           client issues:                      rexecd issues:
                                                       issues:
            rexeccmd.c 
                                                     socket()
                [53] getservbyname()                 socket()
                                                     bind()
                [60] rexec()                         bind()
                                                     listen()
                rexec.c                              listen()
                                                     select()
                    [61] gethostbyname()             select()
                                                     accept()
                    [70] socket()                    accept()
                    [79] connect()       
       SAS  Institute Inc                                                   Slide 4
       SAS  Institute Inc          SAS/C & C++ Compiler R&D
         Cary, NC
          Cary, NC                                                         Feb 1998