9.73 sigaction ¶

struct sigaction {
    void (*sa_sigaction)(int, siginfo_t *, void *);
    void (*sa_restorer)(void);
    sigset_t sa_mask;
    int sa_flags;
};

int sigaction(int sig, struct sigaction *act, struct sigaction *oldact);

This syscall fetches and/or changes the associated actions with the signal sig.

If not NULL, act can be used for setting a new action, if not NULL, oldact can be used for getting the existing action.

It returns 0 on success or -1 on failure, with the following errno:

EINVAL

sig is not valid.

EFAULT

A non-NULL pointer points to not valid memory.

EPERM

The caller does not have the appropriate permissions over pid to actually kill.