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thr_stksegment - get thread stack address and size

cc -mt [ flag... ] file...[ library... ]
#include <thread.h>
#include <signal.h>

int thr_stksegment(stack_t *ss);

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.

The thr_stksegment() function returns 0 if the thread stack address and size were successfully retrieved. Otherwise, it returns a non-zero error value.

The thr_stksegment() function will fail if: EAGAIN

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

MT-Level MT-Safe

sigaltstack (2), thr_create (3C), attributes (7)