THR_STKSEGMENT(3C) Standard C Library Functions THR_STKSEGMENT(3C)
NAME
thr_stksegment - get thread stack address and size
SYNOPSIS
cc -mt [
flag... ]
file...[
library... ]
#include <thread.h>
#include <signal.h>
int thr_stksegment(
stack_t *ss);
DESCRIPTION
The
thr_stksegment() function returns, in its
stack_t argument, the
address and size of the calling thread's stack.
The
stack_t structure includes the following members:
void *ss_sp
size_t ss_size
int ss_flags
On successful return from
thr_stksegment(),
ss_sp contains the high
address of the caller's stack and
ss_size contains the size of the
stack in bytes. The
ss_flags member is always 0. Note that the
meaning of
ss_sp is reversed from other uses of
stack_t such as
sigaltstack(2) where
ss_sp is the low address.
The stack information provided by
thr_stksegment() is typically used
by debuggers, garbage collectors, and similar applications. Most
applications should not require such information.
RETURN VALUES
The
thr_stksegment() function returns
0 if the thread stack address
and size were successfully retrieved. Otherwise, it returns a non-
zero error value.
ERRORS
The
thr_stksegment() function will fail if:
EAGAIN The stack information for the thread is not available
because the thread's initialization is not yet complete,
or the thread is an internal thread.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+
SEE ALSO
sigaltstack(2),
thr_create(3C),
attributes(7) June 15, 2000 THR_STKSEGMENT(3C)
