sigaltstack(const stack_t *_Nullable restrict ss , stack_t *_Nullable restrict old_ss ); Feature Test ... specifying the SA_ONSTACK flag. The ss argument is used to specify a new a…specifies an adjustment in microseconds. ADJ_OFFSET_SS_READ (functional since Linux 2.6.28) Return ... value of either 0 or ADJ_OFFSET_SS_READ for modes . Only the superuserspecifies an adjustment in microseconds. ADJ_OFFSET_SS_READ (functional since Linux 2.6.28) Return ... value of either 0 or ADJ_OFFSET_SS_READ for modes . Only the superuserform: struct { const kernel_sigset_t *ss; /* Pointer to signal set */ size_t ss ... bytes) of object pointed to by 'ss' */ }; This allows the system call to obtain bothform: struct { const kernel_sigset_t *ss; /* Pointer to signal set */ size_t ss ... bytes) of object pointed to by 'ss' */ }; This allows the system call to obtain bothform: struct { const kernel_sigset_t *ss; /* Pointer to signal set */ size_t ss ... bytes) of object pointed to by 'ss' */ }; This allows the system call to obtain both