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                ## setgid ## 設置真實的組識別碼 ### 相關函數 ### getgid,setregid,getegid,setegid ### 表頭文件 ### ``` #include<unistd.h> ``` ### 定義函數 ### ``` int setgid(gid_t gid); ``` ### 函數說明 ### setgid()用來將目前進程的真實組識別碼(real gid)設成參數gid值。如果是以超級用戶身份執行此調用,則real、effective與savedgid都會設成參數gid。 ### 返回值 ### 設置成功則返回0,失敗則返回-1,錯誤代碼存于errno中。 ### 錯誤代碼 ### EPERM 并非以超級用戶身份調用,而且參數gid 并非進程的effective gid或saved gid值之一。
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