ucontext(3) manual page

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 *);

Manual Pages — UCONTEXT

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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

	`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 )`;