Manual Pages  — UCONTEXT

ucontext – user thread context

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO

Standard C Library (libc, -lc)

#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:

	int getcontext(ucontext_t *);
	ucontext_t * getcontextx(void);
	int setcontext(const ucontext_t *);
	void makecontext(ucontext_t *, void (*)(void), int, ...);
	int swapcontext(ucontext_t *, const ucontext_t *);