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/* $OpenBSD: uthread_stackseg_np.c,v 1.4 2004/05/01 22:15:10 marc Exp $ */
/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/queue.h>
#include <errno.h>
#include <pthread.h>
#include <pthread_np.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;
if (thread->stack) {
base = thread->stack->base;
#if !defined(MACHINE_STACK_GROWS_UP)
base += 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) {
pgsz = sysconf(_SC_PAGESIZE);
if (pgsz == (size_t)-1)
ret = EAGAIN;
else {
#if defined(MACHINE_STACK_GROWS_UP)
base = (caddr_t) USRSTACK;
#else
base = (caddr_t) ((USRSTACK - DFLSSIZ) & ~(pgsz - 1));
base += DFLSSIZ;
#endif
sinfo->ss_sp = base;
sinfo->ss_size = DFLSSIZ;
sinfo->ss_flags = 0;
ret = 0;
}
} else
ret = EAGAIN;
return ret;
}
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