where to find exit(int) function implementation

[Matthias Apitz]

Am 10.01.2018 14:01, schrieb Vitalio D:
> Hello,
> 
> How and where void _exit(int) is implemented? I've started
> with exit(int) defined in exit.c un stdlib, but I've got stuck at
> unistd.h where void _exit(int) __dead2;
> After that I couldn't find anything by running
> find /usr/src -name "*.c" -exec grep " _exit(int" /dev/null {} \;

$ find /usr/src -name *.c | grep exit
/usr/src/sys/kern/kern_exit.c
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_onexit.c
/usr/src/lib/libc/arm/aeabi/aeabi_atexit.c
/usr/src/lib/libc/stdlib/cxa_thread_atexit.c
/usr/src/lib/libc/stdlib/cxa_thread_atexit_impl.c
/usr/src/lib/libc/stdlib/exit.c
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/usr/src/lib/libc/stdlib/atexit.c
/usr/src/lib/libc/stdlib/quick_exit.c
/usr/src/lib/libthr/thread/thr_exit.c
/usr/src/contrib/netbsd-tests/lib/libc/stdlib/h_atexit.c
/usr/src/contrib/netbsd-tests/lib/libc/stdlib/t_exit.c
/usr/src/contrib/netbsd-tests/lib/libpthread/h_atexit.c
/usr/src/contrib/netbsd-tests/lib/libpthread/h_exit.c
/usr/src/contrib/binutils/libiberty/atexit.c
/usr/src/contrib/binutils/libiberty/xatexit.c
/usr/src/contrib/binutils/libiberty/xexit.c
/usr/src/contrib/tcp_wrappers/clean_exit.c
/usr/src/contrib/xz/src/common/tuklib_exit.c
/usr/src/contrib/gcclibs/libiberty/atexit.c
/usr/src/contrib/gcclibs/libiberty/xatexit.c
/usr/src/contrib/gcclibs/libiberty/xexit.c
/usr/src/contrib/sendmail/libsm/strexit.c
/usr/src/contrib/sendmail/src/sysexits.c
/usr/src/contrib/diff/lib/exitfail.c
/usr/src/contrib/nvi/vi/v_zexit.c