_Exit(3): document implementation
Remove a useless note about unlinking temporary files, they are unlinked in tmpfile(3) [1]. Add a note about __cxa_atexit(). Explain exactly what are the FreeBSD implementation differences between exit() and _Exit(). Noted by: markj [1] Reviewed by: emaste, markj Sponsored by: The FreeBSD Foundation MFC after: 3 days Differential revision: https://reviews.freebsd.org/D31425
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@ -32,7 +32,7 @@
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.\" @(#)exit.3 8.1 (Berkeley) 6/4/93
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.\" @(#)exit.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\"
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.Dd March 22, 2020
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.Dd August 5, 2021
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.Dt EXIT 3
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.Dt EXIT 3
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.Os
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.Os
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.Sh NAME
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.Sh NAME
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@ -58,17 +58,17 @@ Before termination,
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performs the following functions in the order listed:
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performs the following functions in the order listed:
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.Bl -enum -offset indent
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.Bl -enum -offset indent
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.It
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.It
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Call the functions registered with the
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Call all functions registered with the
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.Xr __cxa_atexit 3
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function
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(which are typically destructors from the loaded dynamic objects),
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and the functions registered with the
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.Xr atexit 3
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.Xr atexit 3
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function, in the reverse order of their registration.
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function, in the reverse order of their registration.
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.It
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.It
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Flush all open output streams.
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Flush all open output streams.
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.It
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.It
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Close all open streams.
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Close all open streams.
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.It
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Unlink all files created with the
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.Xr tmpfile 3
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function.
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.El
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.El
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.Pp
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.Pp
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The
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The
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@ -76,6 +76,14 @@ The
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function terminates without calling the functions registered with the
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function terminates without calling the functions registered with the
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.Xr atexit 3
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.Xr atexit 3
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function, and may or may not perform the other actions listed.
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function, and may or may not perform the other actions listed.
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The
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.Fx
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implementation of the
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.Fn _Exit
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function does not call destructors registered with
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.Xr __cxa_atexit 3,
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does not flush buffers, and does not close streams.
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.Pp
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Both functions make the low-order eight bits of the
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Both functions make the low-order eight bits of the
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.Fa status
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.Fa status
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argument available to a parent process which has called a
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argument available to a parent process which has called a
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