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sbrk

plan9.sbrk

pub fn sbrk(n: usize) usize

File

lib/std/os/plan9.zig:369

Code

pub fn sbrk(n: usize) usize {
    if (bloc == 0) {
        // we are at the start
        bloc = @intFromPtr(&ExecData.end);
        bloc_max = @intFromPtr(&ExecData.end);
    }
    const bl = std.mem.alignForward(usize, bloc, std.heap.pageSize());
    const n_aligned = std.mem.alignForward(usize, n, std.heap.pageSize());
    if (bl + n_aligned > bloc_max) {
        // we need to allocate
        if (brk_(bl + n_aligned) < 0) return 0;
        bloc_max = bl + n_aligned;
    }
    bloc = bloc + n_aligned;
    return bl;
}