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Server-Side Code for Doors
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The server program, server1.c, is shown in Listing 4-1. It consists of server function called cube_proc and a main function. Following this listing is a brief description of the various pieces of code.
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Listing 4-1
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1 2 3 4 5 6 Listing 4.1: Example server side code for Doors File: server1.c #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <door.h> #include "ssp.h" //Solaris stuff
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7 static void cube_proc(void * pcookie, 8 char * dataptr, 9 size_t argsz, 10 door_desc_t *dp, 11 uint_t ndesc); 12 ( 13 long arg, result; 14 arg = *((long *) dataptr) ; 15 16 17 18 19 20 21 } int main(int argc, char * argv[]) { int fd; int tempfd; result = arg * arg * arg ; Door_return ((char *) &result, sizeof(result), NULL, 0);
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22 23 24 25 26 27 28 29 30 31 32 33 34 /* get descriptor and bind cube_proc to it */ fd=door_create(serv_proc, NULL, 0); unlink(argv[1]) ; /* delete this file if it already exists from a previous run */ tempfd=creat(argv[1], FILE _PERMS); /* create the file associated with the door */ close (tempfd); /* close the file before attaching it to fd */ fattach(fd, argv[1]); /* associate door descriptor with an
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existing file */ while(1) pause(); /* do nothing; the real work is implemented in the server threads } */
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The listing starts with some header files that include the main library header file <door.h> (see lines 1 6). Header files include only the declaration of various functions. The actual implementations of these functions appear in separate files, which are used when the code is compiled and linked.
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Server Function cube_proc() In lines 7 17, a server function named cube-proc() is defined. This server function takes five arguments as input, but the only one we use is dataptr, which points to the first byte of the argument. The long argument is obtained through this pointer and cubed. Control is passed back to the client, along with the result, by invoking the Door_return function. The first argument to this function points to the result, the second argument is the size of this result, and the remaining two arguments deal with the returning descriptors. Create a Door Descriptor and Attach It to a Pathname Lines 18 29 describe
a main function that takes a pathname as input. This pathname is supplied at the time the server is started. In this function, first a door descriptor is created for the function cube_proc() by calling the function Door-create(). The first argument to this function is a pointer that s called for this door, namely cube-proc(). Next, the door descriptor is associated with a pathname in the file system, because this pathname is how the client identifies the door. This association is performed by creating a regular file in the file system. After this, we call the function fattach(), which associates a descriptor with a pathname.
Main Server Thread Pauses In lines 31 34, the main server thread blocks
by calling the pause() function. Now, cube_proc() is ready to do its work on the client request. All the work is done by the server function cube_ proc(), which executes in a separate thread in the server process each time a client makes a request.
Four
Next, the code is compiled and linked to create an executable called server1. To run the server we use the following command which starts the server in a separate window:
Solaris % server1 /tmp/server1
Client-Side Code
A sample client program, called client1.c, is shown in Listing 4-2. The program has a main function that takes in two arguments. The first argument, argv[1], is the pathname that specifies the door and is supplied at the time the client is started. The second input on the command line is the number (a long type), which will be cubed by calling the server function. The program starts with a number of header files, including the most important library, <door.h>, which encapsulates all the system-level calls. The client1.c program involves the steps detailed in the following subsections.
Listing 4-2
Listing 4.2: Doors' sample client side code: File: cleint1.c 1 #include <unistd.h> 2 #include <sys/types.h> 3 #include <sys/stat.h> 4 #include <fcntl.h> 5 #include <door.h> 6 #include "ssp.h" 7 int main (int argc, char **argv )
8 { 9 10 11 12 13 13 14 15 16 17
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