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You are right, using seteuid will work, but there is a problem with sending signals: kill(-1,SIGKILL) will kill all processes, not only processes with uid=killer's_euid. Killer process has uid=0, so...

fprintf is not async-signal safe, but replacing it by write(STDERR_FILENO,...) did not change anything - received only 1 SIGUSR1 of 3.

Why "signal safety" may change something? Signals are blocked, when signal action called.

Ok, I've found list of async-signal-safe functions. I've replaced pthread_join by sleep(3) and system() by...

I'm newbie in UNIX programming, I have a problem with signals. I'm writing multithread program, where threads can die at any moment. When thread dies it generates signal SIGUSR1 to main thread and...

I'm writting programm to test students programms (user sends source code via web, server compiles it, run it with some tests). I'm trying to prevent unkillable programms when user's programm forks a...

Yes, but i do not know is it safe. I mean killall gets process list from kernel. While getting process list from kernel process_we_want_to_kill can call fork and some processes may be stay alive...

Is there any secure way to kill all processes with specified UID ?
Traditional way like

setuid(WANTED_UID);
kill(-1,SIGKILL);

is not secure, because this programm will receive...