为什么getpid()返回pid_t而不是int? [英] Why does getpid() return pid_t instead of int?

问题描述

getpid()这样的调用背后的逻辑是什么?返回类型的值 pid_t而不是unsigned int?还是int?这有什么帮助?

我猜想这与可移植性有关吗?保证pid_t在不同平台上具有相同的大小，并且可能具有不同的int s等大小??

解决方案

我认为是相反的:使程序可以跨平台移植，而不管PID是16位还是32位(甚至更长). /p>

What's the logic behind calls like getpid() returning a value of type pid_t instead of an unsigned int? Or int? How does this help?

I'm guessing this has to do with portability? Guaranteeing that pid_t is the same size across different platforms that may have different sizes of ints etc.?

解决方案

I think it's the opposite: making the program portable across platforms, regardless of whether, e.g., a PID is 16 or 32 bits (or even longer).

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