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/* $OpenBSD: uthread_stackseg_np.c,v 1.6 2007/07/08 01:53:46 kurt Exp $ */
/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/lock.h>
#include <sys/resource.h>
#include <sys/queue.h>
#include <errno.h>
#include <pthread.h>
#include <pthread_np.h>
#include <stddef.h>
#include <unistd.h>
#include <uvm/uvm_extern.h>
#include "pthread_private.h"
/*
* Return stack info from the given thread. Based upon the solaris
* thr_stksegment function.
*/
int
pthread_stackseg_np(pthread_t thread, stack_t *sinfo)
{
char *base;
size_t pgsz;
int ret;
struct rlimit rl;
if (thread->stack) {
base = thread->stack->base;
#if !defined(MACHINE_STACK_GROWS_UP)
base += (ptrdiff_t)thread->stack->size;
#endif
sinfo->ss_sp = base;
sinfo->ss_size = thread->stack->size;
sinfo->ss_flags = 0;
ret = 0;
} else if (thread == _thread_initial) {
if (getrlimit(RLIMIT_STACK, &rl) != 0)
return (EAGAIN);
pgsz = (size_t)sysconf(_SC_PAGESIZE);
if (pgsz == (size_t)-1)
return (EAGAIN);
/*
* round_page() stack rlim_cur and
* trunc_page() USRSTACK to be consistent with
* the way the kernel sets up the stack.
*/
sinfo->ss_size = (size_t)rl.rlim_cur;
sinfo->ss_size += (pgsz - 1);
sinfo->ss_size &= ~(pgsz - 1);
sinfo->ss_sp = (caddr_t) (USRSTACK & ~(pgsz - 1));
sinfo->ss_flags = 0;
ret = 0;
} else
ret = EAGAIN;
return ret;
}
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