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是在unix域套接口上做为补助数据传送得数据:fcred 结构得用户凭证。- struct fcred {
- uid_t fc_ruid ; read user id
- gid_t fc_rgid; read group id
- char fc_login[MAXLOGNAME] ; setlogin() name
- uid_t fd_uid; effective user id
- short fc_ngroups; number of groups
- gid_t fc_groups[NGROUPS]; supplementary group ids
- } ;
- #define fc_groups[0]; /* effective group id */
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