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'\" te .\" Copyright (c) 1989, AT&T. All rights reserved. .\" Copyright (c) 2001, 2023, Oracle and/or its affiliates. .\" Portions Copyright (c) 1992, The X/Open Company Ltd. All rights reserved. .\" Oracle gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. This notice shall appear on any product containing this material. .TH getcontext 2 "30 Jan 2023" "Oracle Solaris 11.4" "System Calls" .SH NAME getcontext, setcontext \- get and set current user context .SH SYNOPSIS .LP .nf #include <ucontext.h> \fBint\fR \fBgetcontext\fR(\fBucontext_t *\fR\fIucp\fR); .fi .LP .nf \fBint\fR \fBsetcontext\fR(\fBconst ucontext_t *\fR\fIucp\fR); .fi .SH DESCRIPTION .sp .LP The \fBgetcontext()\fR function initializes the structure pointed to by \fIucp\fR to the current user context of the calling process. The \fBucontext_t\fR type that \fIucp\fR points to defines the user context and includes the contents of the calling process' machine registers, the signal mask, and the current execution stack. .sp .LP The \fBsetcontext()\fR function restores the user context pointed to by \fIucp\fR. A successful call to \fBsetcontext()\fR does not return; program execution resumes at the point specified by the \fIucp\fR argument passed to \fBsetcontext()\fR. The \fIucp\fR argument should be created either by a prior call to \fBgetcontext()\fR, or by being passed as an argument to a signal handler. If the \fIucp\fR argument was created with \fBgetcontext()\fR, program execution continues as if the corresponding call of \fBgetcontext()\fR had just returned. If the \fIucp\fR argument was created with \fBmakecontext\fR(3C), program execution continues with the function passed to \fBmakecontext\fR(3C). When that function returns, the process continues as if after a call to \fBsetcontext()\fR with the \fIucp\fR argument that was input to \fBmakecontext\fR(3C). If the \fIucp\fR argument was passed to a signal handler, program execution continues with the program instruction following the instruction interrupted by the signal. If the \fBuc_link\fR member of the \fBucontext_t\fR structure pointed to by the \fIucp\fR argument is equal to 0, then this context is the main context, and the process will exit when this context returns. The effects of passing a \fIucp\fR argument obtained from any other source are unspecified. .SH RETURN VALUES .sp .LP On successful completion, \fBsetcontext()\fR does not return and \fBgetcontext()\fR returns \fB0\fR. Otherwise, \fB\(mi1\fR is returned. .SH ERRORS .sp .LP No errors are defined. .SH USAGE .sp .LP Portable applications should not modify or access the \fBuc_mcontext\fR member of \fBucontext_t\fR. A portable application cannot assume that context includes any process-wide static data, possibly including \fBerrno\fR. Users manipulating contexts should take care to handle these explicitly when required. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed .TE .sp .SH SEE ALSO .sp .LP \fBsigaction\fR(2), \fBsigaltstack\fR(2), \fBsigprocmask\fR(2), \fBbsd_signal\fR(3C), \fBmakecontext\fR(3C), \fBswapcontext\fR(3C), \fBucontext.h\fR(3HEAD), \fBattributes\fR(7), \fBstandards\fR(7) .SH HISTORY .sp .LP The \fBgetcontext()\fR and \fBsetcontext()\fR functions have been included in Solaris since the Solaris 2.0 release.