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int sys_swapcontext (struct ucontext *old_ctx,
struct ucontext *new_ctx, int r5, int r6, int r7,
int r8, struct pt_regs *regs);
swapcontext swaps out context old_ctx with new context new_ctx. The int
r# values have no place in the system call functionality. The regs val-
ue indicates the current user register values from the user stack.
swapcontext returns 0 on success; otherwise, swapcontext returns one of
the errors listed in the "Errors" section.
swapcontext could not verify that the memory area pointed to by
old_ctx or new_ctx was accessible for the operation.
A fault occurred when the context was being copied into the ker-
nel's image of the user's registers. The should only occur in an
getcontext(2), sigaction(2), sigaltstack(2), sigprocmask(2)
Linux 2.6 2004-March-12 SWAPCONTEXT(2)