我试图将一些代码转换为Swift，列出所有运行的进程。但是由于它需要调用一些C特定的API，我有点挣扎。有人能告诉我这里我做错了什么吗？最后的print语句输出了不正确的值。我认为它应该是进程名称。还有行info = malloc(length)让我毛骨悚然。我应该如何正确地分配它？

var maxArgumentsSize: Int = 0
if maxArgumentsSize == 0 {
    var size: size_t = MemoryLayout<Int>.size
    var mib: [Int32] = [CTL_KERN, KERN_ARGMAX]
    let a = sysctl(&mib, 2, &maxArgumentsSize, &size, nil, 0)
    if a == -1 {
        maxArgumentsSize = 4096;
    }
}

var mib: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_ALL]
var info: UnsafeMutableRawPointer? = nil
var length: size_t = 0
var count: Int = 0

if sysctl(&mib, 3, nil, &length, nil, 0) < 0 {
    exit(EXIT_FAILURE)
}

info = malloc(length)

if sysctl(&mib, 3, info, &length, nil, 0) < 0 {
    free(info)
    exit(EXIT_FAILURE)
}

count = length / MemoryLayout<kinfo_proc>.size
for index in 0...count {
    let info = info?.assumingMemoryBound(to: kinfo_proc.self)
    let pid: pid_t = info![index].kp_proc.p_pid
    let buffer = UnsafeMutablePointer<CChar>.allocate(capacity: maxArgumentsSize)
    var mib: [Int32] = [CTL_KERN, KERN_PROCARGS2, pid]
    if sysctl(&mib, 3, buffer, &maxArgumentsSize, nil, 0) == 0 {
        let str = String(cString: buffer, encoding: .utf8)
        print(str)
    }
    free(buffer);
}