arg_t _brk(void)
{
/* FIXME: when we start building binaries with the stack embedded in them
they will need a different test.. */
/* Don't allow break to be set past user's stack pointer */
/*** St. Nitschke allow min. of 512 bytes for Stack ***/
if (addr >= (char *) brk_limit()) {
kprintf("%d: out of memory\n", udata.u_ptab->p_pid);
udata.u_error = ENOMEM;
return (-1);
}
udata.u_break = (uaddr_t) addr;
return (0);
}
arg_t _brk(void)
{
/* Don't allow break to be set outside of the range the platform
permits. For most platforms this is within 512 bytes of the
stack pointer
FIXME: if we get more complex mapping rule types then we may
need to make this something like if (brk_valid(addr)) so we
can keep it portable */
if (addr >= brk_limit()) {
kprintf("%d: out of memory\n", udata.u_ptab->p_pid);
udata.u_error = ENOMEM;
return -1;
}
/* If we have done a break that gives us more room we must zero
the extra as we no longer guarantee it is clear already */
if (addr > udata.u_break)
uzero((void *)udata.u_break, addr - udata.u_break);
udata.u_break = addr;
return 0;
}
