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pthread_stackseg_npreturn stack size and location

#include <sys/signal.h>
#include <pthread_np.h>

pthread_stackseg_np(pthread_t thread, stack_t *sinfo);

The () function returns information about the given thread's stack. A stack_t is the same as a struct sigaltstack (see sigaltstack(2)) except the ss_sp variable points to the top of the stack instead of the base.

If successful, the pthread_stackseg_np() function will return 0. Otherwise an error number will be returned to indicate the error.

The pthread_stackseg_np() function will fail if:

Stack information for the given thread is not currently available. There is no guarantee that the given thread's stack information will ever become available.

sigaltstack(2), pthreads(3)

pthread_stackseg_np() is a non-portable extension to IEEE Std 1003.1-2001 (“POSIX.1”).

June 5, 2013 OpenBSD-6.1