exit(0) exit(1)...的都是什么意思？

herbert

初学ＬＩＮＵＸ下编程，看到书上给出的程序里都有exit(0) exit(1)...的返回？语句，到底具体的意思是什么啊？括号里面的１、2。。。是什么意思啊？
大家看在我凌晨发帖子的面子上，给解答一下啊。  ：-）

kj501

这是程序返回给系统的状态码，具体含义由程序自己定义。一般返回0表示正常，返回大于0的数表示错误代码。

macarthor

而且前边一般用perror打印错误信息

弥敦路九号

NAME
       `exit'--end program execution

SYNOPSIS
            #include <stdlib.h>
            void exit(int CODE);

DESCRIPTION
       Use `exit' to return control from a program to the host operating envi-
       ronment.  Use the argument CODE to pass an exit status to the operating
       environment:  two particular values, `EXIT_SUCCESS' and `EXIT_FAILURE',
       are defined in  ``stdlib.h''  to  indicate  success  or  failure  in  a
       portable fashion.

          `exit'  does  two  kinds  of cleanup before ending execution of your
       program.  First, it calls all application-defined cleanup functions you
       have enrolled with `atexit'.  Second, files and streams are cleaned up:
       any pending output is delivered to the host system, each open  file  or
       stream is closed, and files created by `tmpfile' are deleted.

RETURNS
       `exit' does not return to its caller.