|UCONTEXT(3)||FreeBSD Library Functions Manual||UCONTEXT(3)|
NAMEucontext — user thread context
LIBRARYStandard C Library (libc, -lc)
SYNOPSIS#include < ucontext.h>
DESCRIPTIONThe 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 *);
|September 10, 2002||FreeBSD|