c++ - 如何使用 waitpid() 获取子进程的状态？

Question

我正在尝试获取子进程的状态。例如，当我运行不存在的命令“adjsafkl”时，系统打印“WRONG”，但是当我运行文件夹也不存在的“cp sssa”时，系统不会将此命令标记为错误。我想知道是否有办法修复此错误？

Answer 1

您可以在 WIFEXITED 之后检查 WEXITSTATUS:

WIFEXITED: returns true if the child terminated normally, that is, by calling exit(3) or _exit(2), or by returning from main().

WEXITSTATUS: returns the exit status of the child. This consists of the least significant 8 bits of the status argument that the child specified in a call to exit(3) or _exit(2) or as the argument for a return statement in main(). This macro should only be employed if WIFEXITED returned true.