Function getContext [src]

Capture the current context. The register values in the context will reflect the state after the platform getcontext function returns. It is valid to call this if the platform doesn't have context capturing support, in that case false will be returned.

Prototype

pub inline fn getContext(context: *ThreadContext) bool

Parameters

context: *ThreadContext

Source

  pub inline fn getContext(context: *ThreadContext) bool {
    if (native_os == .windows) {
        context.* = std.mem.zeroes(windows.CONTEXT);
        windows.ntdll.RtlCaptureContext(context);
        return true;
    }

    const result = have_getcontext and posix.system.getcontext(context) == 0;
    if (native_os == .macos) {
        assert(context.mcsize == @sizeOf(std.c.mcontext_t));

        // On aarch64-macos, the system getcontext doesn't write anything into the pc
        // register slot, it only writes lr. This makes the context consistent with
        // other aarch64 getcontext implementations which write the current lr
        // (where getcontext will return to) into both the lr and pc slot of the context.
        if (native_arch == .aarch64) context.mcontext.ss.pc = context.mcontext.ss.lr;
    }

    return result;
}  