#include <ucontext.h>int getustack(stack_t **spp);
The getustack() function retrieves the address of per-LWP stack boundary information. The address is stored at the location pointed to by spp. If this address has not been defined using a previous call to setustack(), NULL is stored at the location pointed to by spp.
The setustack() function changes the address of the current thread's stack boundary information to the value of sp.
Upon successful completion, these functions return 0. Otherwise, -1 is returned and errno is set to indicate the error.
Implementors of custom threading libraries should use setustack() to set the address of the stack bounds to in internal per-thread data structure.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|