From: andyp AT parallax DOT co DOT uk (Andy Piper)
Subject: Comments on this socket code for cvs please?
3 Nov 1997 06:39:21 -0800
Message-ID: <3.0.1.32.19971103135605.00ac7100.cygnus.gnu-win32@mailhost>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
To: gnu-win32 AT cygnus DOT com

Hi,

I have generated the following patch for cvs which allows cvs to be started
as a daemon listening on the cvs socket. However, the subprocess which is
generated doesn't disappear when it exits (it goes to <defunct> mode) and
if I try fork() + execv() that doesn't work at all for some reason. If
anyone who is more familiar with this sort of thing could comment I would
be very grateful.

andy

*** main.c	1997/10/31 09:31:28	1.1
--- main.c	1997/10/31 12:11:14
***************
*** 20,25 ****
--- 20,30 ----
  extern int gethostname ();
  #endif
  
+ #ifdef SERVER_SUPPORT
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ #endif
+ 
  char *program_name;
  char *program_path;
  char *command_name;
***************
*** 107,112 ****
--- 112,118 ----
      { "logout",   NULL,       NULL,        logout },
  #ifdef SERVER_SUPPORT
      { "pserver",  NULL,       NULL,        server }, /* placeholder */
+     { "pserverd", NULL,       NULL,        server }, /* placeholder */
  #endif
  #endif /* AUTH_CLIENT_SUPPORT */
      { "rdiff",    "patch",    "pa",        patch },
***************
*** 380,386 ****
      int free_CVSroot = 0;
      int free_Editor = 0;
      int free_Tmpdir = 0;
! 
      int help = 0;		/* Has the user asked for help?  This
  				   lets us support the `cvs -H cmd'
  				   convention to give help for cmd. */
--- 386,397 ----
      int free_CVSroot = 0;
      int free_Editor = 0;
      int free_Tmpdir = 0;
! #ifdef SERVER_SUPPORT    
!     int		servsock, childsock;
!     struct sockaddr_in server;
!     int on = 1;
!     char** saveargv=argv;
! #endif
      int help = 0;		/* Has the user asked for help?  This
  				   lets us support the `cvs -H cmd'
  				   convention to give help for cmd. */
***************
*** 682,687 ****
--- 693,774 ----
        
  	    /* Pretend we were invoked as a plain server.  */
  	    command_name = "server";
+ 	}
+ 
+ 	if (strcmp (command_name, "pserverd") == 0)
+ 	{
+ 	  /* pserver daemon mode */
+ 	  /* first fork and exit so that the child takes control */
+ 	  if (!trace && fork())
+ 	    {
+ 	      exit(0);
+ 	    }
+ 	  /* become a daemon */
+ 	  if (!trace && setsid() < 0)
+ 	    {
+ 	      error(1, errno, "pserverd: setsid failed");
+ 	    }
+ 	  /* create a socket to listen on */
+ 	  if ((servsock = socket(AF_INET, SOCK_STREAM, 0)) <0)
+ 	    {
+ 	      error(1, errno, "pserverd: socket() failed");
+ 	    }
+ 	  setsockopt(servsock, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
+ 		     sizeof(on));
+ 
+ 	  server.sin_family = AF_INET;
+ 	  server.sin_addr.s_addr = INADDR_ANY;
+ 	  server.sin_port = htons(CVS_AUTH_PORT);
+ 
+ 	  if (bind(servsock, (struct sockaddr *)&server, sizeof(server)) < 0)
+ 	    {
+ 	      shutdown(servsock, 2);
+ 	      close(servsock);
+ 	      error(1, errno, "pserverd: bind failed");
+ 	    }
+ 
+ 	  if (listen(servsock, 5) < 0)
+ 	    {
+ 	      error(1, errno, "pserverd: listen failed");
+ 	    }
+ 	  
+ 	  for (;;) {
+ 	    childsock = 
+ 	      accept(servsock, (struct sockaddr *)0, (int*)0);
+ 	  
+ 	    if (trace || !fork())
+ 	      {			/* child */
+ 		close(servsock);
+ 		if (dup2(childsock,STDIN_FILENO)<0
+ 		    ||
+ 		    close(childsock)<0
+ 		    ||
+ 		    dup2(STDIN_FILENO,STDOUT_FILENO)<0)
+ /* 		    || */
+ /* 		    dup2(STDIN_FILENO,STDERR_FILENO)<0) */
+ 		  {
+ 		    error(1, errno, "pserverd: dup2() failed");
+ 		  }
+ /* 		argv[0]="pserver"; */
+ /* 		fprintf(stderr,"execing"); */
+ /* 		fprintf(stderr,"%s %s %s %d\n", saveargv[0], saveargv[1],  */
+ /* 			saveargv[2], (int)saveargv[3]); */
+ 		
+ /* 		if (execv(saveargv[0],++saveargv) <0) */
+ /* 		  { */
+ /* 		    error(1, errno, "pserverd: execv() failed"); */
+ /* 		  } */
+ 		break;
+ 	      }
+ 	    else
+ 	      {
+ 		close(childsock);
+ 	      }
+ 	  }
+ 
+ 	  pserver_authenticate_connection ();
+ 	  /* Pretend we were invoked as a plain server.  */
+ 	  command_name = "server";
  	}
  #endif /* AUTH_SERVER_SUPPORT && SERVER_SUPPORT */
  



   ___                ____         	Dr Andy Piper
  / _ \___ ________ _/ / Solutions_	(require 'disclaimer)
 / ___/ _ `/ __/ _ `/ / / _ `/\ \ /	andyp AT parallax DOT co DOT uk
/_/   \_,_/_/  \_,_/_/_/\_,_//_\_\ 	boot /vmemacs

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