01-20-2020
Thankyou, flawless execution.
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LEARN ABOUT FREEBSD
getcontext
GETCONTEXT(3) BSD Library Functions Manual GETCONTEXT(3)
NAME
getcontext, getcontextx, setcontext -- get and set user thread context
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ucontext.h>
int
getcontext(ucontext_t *ucp);
ucontext_t *
getcontextx(void);
int
setcontext(const ucontext_t *ucp);
DESCRIPTION
The getcontext() function saves the current thread's execution context in the structure pointed to by ucp. This saved context may then later
be restored by calling setcontext().
The getcontextx() function saves the current execution context in the newly allocated structure ucontext_t, which is returned on success. If
architecture defines additional CPU states that can be stored in extended blocks referenced from the ucontext_t, the memory for them may be
allocated and their context also stored. Memory returned by getcontextx() function shall be freed using free(3).
The setcontext() function makes a previously saved thread context the current thread context, i.e., the current context is lost and
setcontext() does not return. Instead, execution continues in the context specified by ucp, which must have been previously initialized by a
call to getcontext(), makecontext(3), or by being passed as an argument to a signal handler (see sigaction(2)).
If ucp was initialized by getcontext(), then execution continues as if the original getcontext() call had just returned (again).
If ucp was initialized by makecontext(3), execution continues with the invocation of the function specified to makecontext(3). When that
function returns, ucp->uc_link determines what happens next: if ucp->uc_link is NULL, the process exits; otherwise, setcontext(ucp->uc_link)
is implicitly invoked.
If ucp was initialized by the invocation of a signal handler, execution continues at the point the thread was interrupted by the signal.
RETURN VALUES
If successful, getcontext() returns zero and setcontext() does not return; otherwise -1 is returned. The getcontextx() returns pointer to
the allocated and initialized context on success, and NULL on failure.
ERRORS
No errors are defined for getcontext() or setcontext(). The getcontextx() may return the following errors in errno:
[ENOMEM] No memory was available to allocate for the context or some extended state.
SEE ALSO
sigaction(2), sigaltstack(2), makecontext(3), ucontext(3)
BSD
March 13, 2013 BSD