* Alejandro Colomar <alx.manpages@xxxxxxxxx>, 2021-02-20, 11:05:
In the Linux kernel, there's only one system call, and it's called exit (its entry point is sys_exit(), and can be called using syscall(SYS_exit, ...) *but don't*), BUT it implements the functionality of _exit() (as the standards call it; see above).
To clarify, that's how it used to be, but since 2002ish there's also sys_exit_group, and glibc's _exit() uses that.
BTW, the exit_group.2 man page could use an update (possibly by merging it into exit.2): it says that the "system call is is equivalent to _exit(2) except that it terminates not only the calling thread, but all threads in the calling process’s thread group", which isn't helpful these days.
-- Jakub Wilk
