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UCONTEXT(2) BSD System Calls Manual UCONTEXT(2)
ucontext -- user context
The ucontext_t is a structure type which is used to describe the context of a thread of con-
trol within the execution of a process. A thread's context includes its stack, saved regis-
ters, and list of blocked signals.
The ucontext_t structure includes the following members:
The uc_link member points to the context that will be resumed after the function specified
when modifying a context using makecontext(3) has returned. If uc_link is a NULL pointer,
then the context is the main context, and the process will exit with an exit status of 0
The uc_sigmask member is the set of signals that are blocked when the context is activated.
Further information can be found in sigprocmask(2).
The uc_stack member defines the stack used by the context. Further information can be found
The uc_mcontext member defines the machine state associated with the context; it may consist
of general registers, floating point registers and other machine-specific information. Its
description is beyond the scope of this manual page; portable applications should not access
this structure member.
_exit(2), getcontext(2), setcontext(2), sigaltstack(2), sigprocmask(2), makecontext(3),
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.
BSD April 29, 2010 BSD
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