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.Dd June 13, 2001 .Dt UCONTEXT 2 .Os .Sh NAME .Nm ucontext .Nd user context .Sh SYNOPSIS n ucontext.h .Sh DESCRIPTION .Nm ucontext_t is a structure type which is used to describe the context of a thread of control within the execution of a process.
p .Nm ucontext_t includes the following members: d -literal -offset indent ucontext_t * uc_link sigset_t uc_sigmask stack_t uc_stack mcontext_t uc_mcontext .Ed
p The .Fa uc_link member points to the context that will be resumed after the function specified when modifying a context using .Xr makecontext 3 has returned. If .Fa uc_link is a null pointer, then the context is the main context, and the process will exit with an exit status of 0 upon return.
p The .Fa uc_sigmask member is the set of signals that are blocked when the context is activated. Further information can be found in .Xr sigprocmask 2 .
p The .Fa uc_stack member defines the stack used by the context. Further information can be found in .Xr sigaltstack 2 .
p The .Fa uc_mcontext member defines the machine state associated with the context; it may consist of general registers, floating point registers and other machine-specific infomation. Its description is beyond the scope of this manual page; portable applications should not access this structure member. .Sh SEE ALSO .Xr _exit 2 , .Xr getcontext 2 , .Xr setcontext 2 , .Xr sigaltstack 2 , .Xr sigprocmask 2 , .Xr makecontext 3 , .Xr swapcontext 3 .Sh STANDARDS The .Nm ucontext_t type conforms to .St -xsh5 . .Sh HISTORY The .Fn makecontext and .Fn swapcontext functions first appeared in .At V.4 .