有效组id值为-1有什么特别的意思吗？__group_the_effective_real_set-group_

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有效组id值为-1有什么特别的意思吗？

来源: 互联网发布时间：2015-08-29

本文导语: setregid (getegid(), -1); 这一句执行后，对程序有什么影响? | setregid( ) is used to set the real and effective group IDs of the calling process. If rgid is -1, the real group ID is not changed; if e...

setregid (getegid(), -1);
这一句执行后，对程序有什么影响?

setregid( ) is used to set the real and effective group IDs of
   the calling process. If rgid is -1, the real group ID is not
   changed; if egid is -1, the effective group ID is not changed.
   The real and effective group IDs may be set to different values
   in the same call.

   If the effective user ID of the calling process is root, the real
   group ID and the effective group ID can be set to any legal
   value.

   If the effective user ID of the calling process is not root, the
   real group ID can be set to the saved set-group ID from
   execve(S), or the effective group ID can be set to either the
   saved set-group ID or the real group ID. If a set-GID process
   sets its effective group ID to its real group ID, it can still
   set its effective group ID back to the saved set-group ID.

   If the real group ID is changed (rgid is not -1), the saved
   set-group ID is set to that same value.

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