errno 정리

[codeyoma]

export
1 : not a valid identifier

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exit
1 : too many arguments
255 : numeric argument required

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find_cmd
127 : Command not found
126 : is a directory

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general
127 : No such file or directory
errno = ENOENT
env ARGV

13 : Permission denied
errno = EACCES
cd, opendir

20 : Not a directory
errno = ENOTDIR
cd

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내장, 라이브러리 함수 실행 실패시 에러출력
pipe, fork, dup, getcwd, opendir, malloc, waitpid, chdir,