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'\" te .\" Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. .TH getustack 2 "2 Nov 2004" "Oracle Solaris 11.4" "System Calls" .SH NAME getustack, setustack \- retrieve or change the address of per-LWP stack boundary information .SH SYNOPSIS .LP .nf #include <ucontext.h> \fBint\fR \fBgetustack\fR(\fBstack_t **\fR\fIspp\fR); .fi .LP .nf \fBint\fR \fBsetustack\fR(\fBstack_t *\fR\fIsp\fR); .fi .SH DESCRIPTION .sp .LP The \fBgetustack()\fR function retrieves the address of per-LWP stack boundary information. The address is stored at the location pointed to by \fIspp\fR. If this address has not been defined using a previous call to \fBsetustack()\fR, \fINULL\fR is stored at the location pointed to by \fIspp\fR. .sp .LP The \fBsetustack()\fR function changes the address of the current thread's stack boundary information to the value of \fIsp\fR. .SH RETURN VALUES .sp .LP Upon successful completion, these functions return 0. Otherwise, \(mi1 is returned and \fBerrno\fR is set to indicate the error. .SH ERRORS .sp .LP These functions will fail if: .sp .ne 2 .mk .na \fB\fBEFAULT\fR\fR .ad .RS 10n .rt The \fIspp\fR or \fIsp\fR argument does not refer to a valid address. .RE .SH USAGE .sp .LP Only implementors of custom threading libraries should use these functions to get and set the address of the stack bound to an internal per-thread data structure. Other users should use \fBstack_getbounds\fR(3C) and \fBstack_setbounds\fR(3C). .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.78i) |cw(2.72i) lw(2.78i) |lw(2.72i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level Async-Signal-Safe .TE .sp .SH SEE ALSO .sp .LP \fBstack_getbounds\fR(3C), \fB_stack_grow\fR(3C), \fBstack_inbounds\fR(3C), \fBstack_setbounds\fR(3C), \fBstack_violation\fR(3C), \fBattributes\fR(7)