Messages in this thread | | | From | Zefram <> | Subject | Re: Kill system call | Date | Sat, 23 Mar 1996 16:15:07 +0000 (GMT) |
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>I have a process, which forks off a child. The child process has a >different EUID to the parent. The child sends the parent a signal to >check that it is still alive, but the kill system call returns EPERM >whereas on all the other unix systems the software is running on the >call returns 0.
That's because Linux uses the wrong logic to check for permission to send a signal. The usual Unix logic is that the ruid or euid of the sending process must match the ruid (or, in some versions, suid) of the receiving process. Linux, I think, requires that the euid of the sending process match the ruid or euid of the receiving process.
-zefram
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