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more about sigsetjmp/siglongjmp. 

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This commit is contained in:
yamt 2002-08-10 05:05:24 +00:00
parent de3baf756c
commit 3bb8b93140
1 changed files with 25 additions and 2 deletions
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27
lib/libc/gen/setjmp.3
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@ -1,4 +1,4 @@
.\" $NetBSD: setjmp.3,v 1.10 2002/07/10 14:37:14 yamt Exp $
.\" $NetBSD: setjmp.3,v 1.11 2002/08/10 05:05:24 yamt Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -137,7 +137,30 @@ The
function
pairs save and restore the signal mask if the argument
.Fa savemask
is non-zero, otherwise only the register set and the stack are saved.
is non-zero.
Otherwise, only the register set and the stack are saved.
.Pp
In other words,
.Fn setjmp Ns / Ns Fn longjmp
are functionally equivalent to
.Fn sigsetjmp Ns / Ns Fn siglongjmp
when
.Fn sigsetjmp
is called with a non-zero
.Fa savemask
argument.
Conversely,
.Fn _setjmp Ns / Ns Fn _longjmp
are functionally equivalent to
.Fn sigsetjmp Ns / Ns Fn siglongjmp
when
.Fn sigsetjmp
is called with a zero-value
.Fa savemask .
.Pp
The
.Fn sigsetjmp Ns / Ns Fn siglongjmp
interfaces are preferred for maximum portability.
.Sh ERRORS
If the contents of the
.Fa env