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                ## getgroups ## 取得組代碼 ### 相關函數 ### initgroups,setgroup,getgid,setgid ### 表頭文件 ### ``` #include<unistd.h> #include<sys/types.h> ``` ### 定義函數 ### ``` int getgroups(int size,gid_t list[]); ``` ### 函數說明 ### getgroup()用來取得目前用戶所屬的組代碼。參數size為list〔〕所能容納的gid_t 數目。如果參數size 值為零,此函數僅會返回用戶所屬的組數。 ### 返回值 ### 返回組識別碼,如有錯誤則返回-1。 ### 錯誤代碼 ### EFAULT 參數list數組地址不合法。EINVAL 參數size值不足以容納所有的組。 ### 范例 ### ``` #include<unistd.h> #include<sys/types.h> main() { gid_t list[500]; int x,i; x = getgroups(0.list); getgroups(x,list); for(i=0;i<x;i++) printf(“%d:%d\n”,i,list[i]); } ``` ### 執行 ### ``` 0:00 1:01 2:02 3:03 4:04 5:06 6:10 ```
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