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$FreeBSD$
.Dd September 10, 2002 .Dt UCONTEXT 3 .Os .Sh NAME .Nm ucontext .Nd user thread context .Sh LIBRARY .Lb libc .Sh SYNOPSIS n ucontext.h .Sh DESCRIPTION The .Vt ucontext_t type is a structure type suitable for holding the context for a user thread of execution. A thread's context includes its stack, saved registers, and list of blocked signals.
p The .Vt ucontext_t structure contains at least these fields:
p l -tag -width ".Va mcontext_t uc_mcontext" -offset 3n -compact t Va "ucontext_t *uc_link" context to assume when this one returns t Va "sigset_t uc_sigmask" signals being blocked t Va "stack_t uc_stack" stack area t Va "mcontext_t uc_mcontext" saved registers .El
p The .Va uc_link field points to the context to resume when this context's entry point function returns. If .Va uc_link is equal to .Dv NULL , then the process exits when this context returns.
p The .Va uc_mcontext field is machine-dependent and should be treated as opaque by portable applications.
p The following functions are defined to manipulate .Vt ucontext_t structures:
p l -item -offset 3n -compact t .Ft int .Fn getcontext "ucontext_t *" ; t .Ft "ucontext_t *" .Fn getcontextx "void" ; t .Ft int .Fn setcontext "const ucontext_t *" ; t .Ft void .Fn makecontext "ucontext_t *" "void \*[lp]*\*[rp]\*[lp]void\*[rp]" int ... ; t .Ft int .Fn swapcontext "ucontext_t *" "const ucontext_t *" ; .El .Sh SEE ALSO .Xr sigaltstack 2 , .Xr getcontext 3 , .Xr getcontextx 3 , .Xr makecontext 3