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#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <stdio.h>
#ifndef __pdoctave_c__
#include "m_pd.h"
#include "pdoctave_send.h"
#include "pdoctave_get.h"
#include "pdoctave_command.h"
//#include "math.h"
//#include "d_mayer_fft.c"
//#include "/home/fzotter/downloads/pd-0.38-4/src/d_mayer_fft.c"
//#include "/home/pd/src/pd-0.37-1-alsamm/src/d_mayer_fft.c"
static t_class *pdoctave_class;
static int obj_instances = 0;
static int octave_pid;
static int fd[2];
/* PDOCTAVE is an object that starts an octave process and holds a pipe to its stdin.
* other sub-routines can use the 'writeToOctaveStdIN' routine to write commands
* to octave.
*/
typedef struct _PDOctave_ PDOctave;
struct _PDOctave_
{
t_object x_obj;
};
int getPDOctaveInstances ()
{
return obj_instances;
}
// writing commands to the octave-process
int writeToOctaveStdIN (const char *cmd)
{
int bytes_written;
if (obj_instances > 0) {
bytes_written = write(fd[1], (void*)cmd, strlen(cmd));
if (bytes_written == -1) {
post("error writing to pipe");
return -1;
}
// post("wrote %d bytes", bytes_written);
return 0;
}
else
return -1;
}
static void deletePDOctave (PDOctave *pdoctave_obj)
{
if (obj_instances-- == 1) {
int err = 0;
close(fd[1]);
if ((waitpid(octave_pid, NULL, 0) == -1) && (errno != ECHILD)) {
err = 1;
}
if (err) {
post("error closing octave");
}
}
}
static void *newPDOctave (t_symbol *s, int argc, t_atom *argv)
{
PDOctave * pdoctave_obj;
pdoctave_obj = (PDOctave *) pd_new (pdoctave_class);
// creating only one pipe!
if (!obj_instances++) {
if (pipe(fd) == -1) {
post("Error creating pipe.");
}
if ((octave_pid = fork()) == 0) { /* child process */
// execution of octave and pipe to octave stdin
close(fd[1]);
if (dup2(fd[0], STDIN_FILENO) == -1) {
post("error duplicating filedescriptor to STDIN");
exit(1);
return;
}
close(fd[0]);
execlp("octave", "octave", "-i", NULL);
// this is only reached, when the octave process is
// dying before the pdoctave object
post("shell command ``octave'' could not be executed");
} else if (octave_pid == -1) {
// Error handling
} else { /* parent process */
close(fd[0]);
// waiting for the child process having the octave pipe
// and process properly set up
sleep(1);
}
}
return ((void *) pdoctave_obj);
}
void pdoctave_setup (void)
{
pdoctave_class = class_new
(gensym("pdoctave"),
(t_newmethod) newPDOctave,
(t_method) deletePDOctave,
sizeof (PDOctave),
CLASS_NOINLET, 0);
class_sethelpsymbol(pdoctave_class, gensym("pdoctave-help.pd"));
post("pdoctave successfully loaded!");
pdoctave_send_setup ();
pdoctave_command_setup ();
pdoctave_get_setup ();
}
#define __pdoctave_c_
#endif
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