UCONTEXT(3) BSD Library Functions Manual UCONTEXT(3)

NAME
     uuccoonntteexxtt - user thread context

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

DESCRIPTION
     The ucontextt 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 ucontextt structure contains at least these fields:

        ucontextt *uclink      context to assume when this one returns
        sigsett ucsigmask      signals being blocked
        stackt ucstack         stack area
        mcontextt ucmcontext   saved registers

     The uclink field points to the context to resume when this context's
     entry point function returns.  If uclink is equal to NULL, then the
     process exits when this context returns.

     The ucmcontext field is machine-dependent and should be treated as
     opaque by portable applications.

     The following functions are defined to manipulate ucontextt structures:

        int ggeettccoonntteexxtt(ucontextt *);
        int sseettccoonntteexxtt(const ucontextt *);
        void mmaakkeeccoonntteexxtt(ucontextt *, void (*)(void), int, ...);
        int sswwaappccoonntteexxtt(ucontextt *, const ucontextt *);

SEE ALSO
     sigaltstack(2), getcontext(3), makecontext(3)

BSD                           September 10, 2002                           BSD