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| UCONTEXT(3) | FreeBSD Library Functions Manual | UCONTEXT(3) |
NAME
ucontext —
LIBRARY
Standard C Library (libc, -lc)SYNOPSIS
#include <ucontext.h>
DESCRIPTION
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 *);
SEE ALSO
sigaltstack(2), getcontext(3), getcontextx(3), makecontext(3)STANDARDS
The ucontext_t type conforms to X/Open System Interfaces and Headers Issue 5 (“XSH5”) and IEEE Std 1003.1-2001 (“POSIX.1”). The IEEE Std 1003.1-2008 (“POSIX.1”) revision removed the ucontext_t from the specification.| March 23, 2020 | FreeBSD 13.1-RELEASE |
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