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UCONTEXT(3) Library Functions Manual UCONTEXT(3)

ucontextuser thread context

library “libc”

#include <ucontext.h>

The 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.

The ucontext_t structure contains at least these fields:

ucontext_t *uc_link
context to assume when this one returns
sigset_t uc_sigmask
signals being blocked
stack_t uc_stack
stack area
mcontext_t uc_mcontext
saved registers

The uc_link field points to the context to resume when this context's entry point function returns. If uc_link is equal to NULL, then the process exits when this context returns.

The uc_mcontext field is machine-dependent and should be treated as opaque by portable applications.

The following functions are defined to manipulate ucontext_t structures:

sigaltstack(2), getcontext(3), makecontext(3), makecontext_quick(3), setcontext(3), setcontext_quick(3), swapcontext_quick(3)

September 10, 2002 DragonFly-5.6.1