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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <tcl.h>
#include <tk.h>
#include "gis.h"
#include "dbmi.h"
#include "form.h"
#ifdef USE_G_SOCKS
#include <sys/types.h>
#include <sys/socket.h>
#endif /*USE_G_SOCKS*/
int first = 1;
/* the pipe to send data to GUI */
FILE *parent_send, *parent_recv;
#ifdef USE_G_SOCKS
int pipefd[2];
#define pfd pipefd[1] /* parent's end */
#define cfd pipefd[0] /* child's end */
#endif /*USE_G_SOCKS*/
/* Open new form
*
* returns: 0 success
*/
int
F_open ( char *title, char *html )
{
/* parent */
int c;
/* common */
static int pid;
#ifndef USE_G_SOCKS
static int p1[2], p2[2];
#endif /*USE_G_SOCKS*/
int length;
/* child */
char buf[2000];
G_debug ( 2, "F_open(): title = %s", title);
if ( first ) {
#ifdef USE_G_SOCKS
if ( G_sock_socketpair(AF_UNIX, SOCK_STREAM, 0, pipefd) < 0)
G_fatal_error ("Cannot make socket pair");
#else
if ( pipe(p1) < 0 || pipe(p2) < 0 )
G_fatal_error ("Cannot open pipe");
#endif /*USE_G_SOCKS*/
if ((pid = fork()) < 0) G_fatal_error ("Cannot create fork");
}
if ( pid == 0 ) { /* Child */
G_debug ( 2, "CHILD" );
/* Note: If you are forking in a Tk based apllication you
* must execl before doing any window operations in the
* child or you will receive an error from the X server */
close (0);
close (1);
#ifndef USE_G_SOCKS
close(p1[1]);
close(p2[0]);
if (dup(p1[0]) != 0) G_fatal_error ("Form: cannot dup() input");
if (dup(p2[1]) != 1) G_fatal_error ("Form: cannot dup() output");
#else
close (pfd);
if (dup(cfd) != 0) G_fatal_error ("Form: cannot dup() input");
if (dup(cfd) != 1) G_fatal_error ("Form: cannot dup() output");
#endif /*USE_G_SOCKS*/
sprintf(buf,"%s/etc/form/form", G_gisbase());
execl ("/bin/sh", "sh", "-c", buf, 0);
G_debug(2, "CHILD END\n");
exit (0);
} else { /* Parent */
G_debug ( 2, "PARENT" );
if ( first ) {
#ifndef USE_G_SOCKS
parent_send = fdopen (p1[1], "w");
close(p1[0]);
parent_recv = fdopen (p2[0], "r");
close(p2[1]);
#else
close(cfd);
parent_send = fdopen (pfd, "w");
parent_recv = fdopen (pfd, "r");
#endif /*USE_G_SOCKS*/
first = 0;
}
G_debug ( 2, "PARENT HTML:\n%s\n", html );
fprintf ( parent_send, "O" );
length = strlen ( title );
fprintf ( parent_send, "%d\n", length );
fprintf ( parent_send, "%s", title );
length = strlen ( html );
fprintf ( parent_send, "%d\n", length );
fprintf ( parent_send, "%s", html );
fflush ( parent_send );
G_debug ( 2, "PARENT: Request sent\n" );
/* Wait for response */
c = fgetc ( parent_recv );
G_debug ( 2, "PARENT: received %c\n", c );
}
return 0;
}
/* Clear old forms from window
*
*/
void
F_clear ( void )
{
char c;
G_debug ( 2, "F_clear()" );
if ( first ) return;
fprintf ( parent_send, "C" );
fflush ( parent_send );
c = fgetc ( parent_recv );
G_debug ( 2, "PARENT: received %c\n", c );
}
void
F_close ( void )
{
char c;
G_debug ( 2, "F_close()" );
if ( first ) return;
fprintf ( parent_send, "D" );
fflush ( parent_send );
c = fgetc ( parent_recv );
G_debug ( 2, "PARENT: received %c\n", c );
first = 1;
}
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