michael gross wrote:

hello

i am new to writing pd externals and have some general questions. i am trying to write an external which establishes a socket connection to an other programm. when I try to compile the fallowing source it does not seem to work because of unlink, bind and accept. i create the socket in the constructor and try to write to it in the function connect_to. when i compile the source i get only warnings and no errors but it still fails to compile.

So what warnings do you get? There should be at least one error too if it doesn't compile. What is unlink(ADDRESS) doing in connect_to?

Martin

i am using the makefile provided in /usr/lib/pd/doc/6.externs and gcc-3.4 for compilation.

without the method connect compilation works fine.

#include <sys/types.h> #include <sys/socket.h> #include <sys/un.h> #include <stdio.h> #include <sys/time.h> #define NSTRS 3 /* no. of strings */ #define ADDRESS "myso" /* addr to connect */ #include "m_pd.h"

char c; FILE *fp; int fromlen; char *strs; int time; char string[50]; int i, s, ns, len; struct sockaddr_un saun, fsaun;

typedef struct obj1 { t_object x_ob; } t_obj1;

t_class *obj1_class;

void *obj1_new(void) { if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { post("no socket");

}

t_obj1 *x = (t_obj1 *)pd_new(obj1_class); post("obj1_new"); return (void *)x;

}

void connect_to(t_obj1 *x) { saun.sun_family = AF_UNIX; strcpy(saun.sun_path, ADDRESS);

unlink(ADDRESS);

len = sizeof(saun.sun_family) + strlen(saun.sun_path);

if (bind(s, &saun, len) < 0) {

}

if (listen(s, 5) < 0) { }

if ((ns = accept(s, &fsaun, &fromlen)) < 0) { }

fp = fdopen(ns, "r");

send(ns, string, strlen(string), 0);

close(s);

}

void obj1_setup(void) { post("obj1_setup"); obj1_class = class_new(gensym("obj1"), (t_newmethod)obj1_new, 0, sizeof(t_obj1), 0, 0);

class_addmethod(obj1_class, (t_method)connect_to, gensym("connect_to"), 0); }

thank you for any help

michael

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