From the Linux man pages: setuid sets the effective user id of the current process.

在Linux手册页上指出：setuid设置当前进程的有效用户id。

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Sem_perm.cuid and sem_perm.uid are set to the effective user id of the calling process.

sem_perm . cuid和sem_perm . uid被设置为调用进程的有效用户id。

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The effective user ID of the calling process must be that of the super-user or match the creator or owner of the semaphore set.

调用进程的有效用户ID必须是超级用户，或者可以与该信号量集的创建者或所有者匹配的用户。

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This allows a set-user-ID (other than root) program to drop all of its user privileges, do some un-privileged work, and then re-engage the original effective user ID in a secure manner.

这使set-user-ID（非根）程序能够放弃它的所有用户特权，执行一些非特权操作，然后恢复原来的有效用户ID。

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To do this, either the effective user ID of the porcess must equal the owner ID of the file, or the process must have write permission for the file.

这时，进程的有效用户ID必须和文件的拥有者ID一致，或者进程必须拥有文件的写权限。

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For this case, the effective user ID of the process must equal the owner ID of the file, or the process must be a superuser process. Merely having write permission for the file is not adequate.

这种情况下，进程的有效用户ID等于文件拥有者的ID，或者进程是超级进程，仅仅有文件的写权限是不够的。

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For this case, the effective user ID of the process must equal the owner ID of the file, or the process must be a superuser process. Merely having write permission for the file is not adequate.

这种情况下，进程的有效用户ID等于文件拥有者的ID，或者进程是超级进程，仅仅有文件的写权限是不够的。

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