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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/form.h>
#ifdef HAVE_SOCKET
#include <sys/types.h>
#ifdef __MINGW32__
#include <winsock.h>
#else /*__MINGW32__*/
#include <sys/socket.h>
#include <netinet/in.h>
#endif /*__MINGW32__*/
#endif /*HAVE_SOCKET */
#ifdef HAVE_SOCKET
static int make_socketpair(int *);
#endif
int first = 1;
/* the pipe to send data to GUI */
FILE *parent_send, *parent_recv;
#ifdef HAVE_SOCKET
int pipefd[2];
#define pfd pipefd[1] /* parent's end */
#define cfd pipefd[0] /* child's end */
#endif /*HAVE_SOCKET */
/* Open new form
*
* returns: 0 success
*/
#ifdef __MINGW32__
int F_open(char *title, char *html)
{
G_fatal_error("F_open is not supported on Windows");
return 1;
}
#else
int F_open(char *title, char *html)
{
/* parent */
int c;
/* common */
static int pid;
#ifndef HAVE_SOCKET
static int p1[2], p2[2];
#endif /*HAVE_SOCKET */
int length;
/* child */
G_debug(2, "F_open(): title = %s", title);
if (first) {
#ifdef HAVE_SOCKET
if (make_socketpair(pipefd) < 0)
G_fatal_error("Cannot make socket pair");
#else
if (pipe(p1) < 0 || pipe(p2) < 0)
G_fatal_error("Cannot open pipe");
#endif /*HAVE_SOCKET */
if ((pid = fork()) < 0)
G_fatal_error("Cannot create fork");
}
if (pid == 0) { /* Child */
char command[2000], script[2000];
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 HAVE_SOCKET
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 /*HAVE_SOCKET */
sprintf(command, "%s/etc/form/form", G_gisbase());
sprintf(script, "%s/etc/form/form.tcl", G_gisbase());
execl(command, "form", "-f", script, NULL);
G_debug(2, "CHILD END\n");
exit(0);
}
else { /* Parent */
G_debug(2, "PARENT");
if (first) {
#ifndef HAVE_SOCKET
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 /*HAVE_SOCKET */
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;
}
#endif
/* 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;
}
#ifdef HAVE_SOCKET
static int make_socketpair(int *fd)
{
int n;
if ((n = socketpair(AF_UNIX, SOCK_STREAM, IPPROTO_IP, fd)) < 0)
return -1;
else
return 0;
}
#endif
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