Re: [9fans] C-program error..

[dhog@plan9.bell-labs.com]

In your example, s in recvit() is expected (by recv()) to point to
storage for the data sent on the channel (all 32 bytes worth),
but you have left it uninitialized.

Also, print() has an internal buffer of 4096 bytes; you need to
increase the stack size or you'll get mysterious errors caused
by stack corruption.

Try this version:

#include <u.h>
#include <libc.h>
#include <thread.h>

#define STACKSIZE (8*1024)

void
recvit(void *arg)
{
	char *s;
	Channel *in = arg;

	recv(in, &s);
	print("%s\n", s);
	free(s);
}

void
threadmain(int argc, char *argv[])
{
	char *m;
	Channel *sch;

	sch = chancreate(sizeof(char*), 0);
	m = strdup("hello world!");
	print("main: %s\n", m);
	proccreate(recvit, (void *)sch, STACKSIZE);

	send(sch, &m);

	print("done\n");
}