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sigaltstack.2: Note that specifying SS_ONSTACK in ss.ss_falgs decreases portability 

In the Illumos source (which presumably mirrors its Solaris
ancestry), there is this check in the sigaltstack()
implementation:

               if (ss.ss_flags & ~SS_DISABLE)
                        return (set_errno(EINVAL));

And in the FreeBSD source we find similar:

                if ((ss->ss_flags & ~SS_DISABLE) != 0)
                        return (EINVAL);

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-05-23 15:22:33 +02:00
parent 1f5002208f
commit e710f10c36
1 changed files with 8 additions and 1 deletions
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9
man2/sigaltstack.2
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@ -273,7 +273,14 @@ On other implementations, and according to POSIX.1,
appears only as a reported flag in
.IR old_ss.ss_flags .
There is no need ever to specify this flag in
.IR ss.ss_flags .
.IR ss.ss_flags
(and indeed, doing so decreases portability,
since some implementations
.\" See the source code of Illumos and FreeBSD, for example.
give an error if
.B SS_ONSTACK
is specified in
.IR ss.ss_flags ).
.SH SEE ALSO
.BR execve (2),
.BR setrlimit (2),