man pages section 3: Basic Library Functions

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Updated: July 2014
 
 

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(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
MT-Level
MT-Safe

See Also

sigaltstack(2), thr_create(3C), attributes(5)