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The delta introduced in the previous revision and attributed to the

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OpenBSD project had grammar problems and made no attempt to motivate
the practice of saving errno.  Replace it with something better.
This commit is contained in:
sheldonh 2001-07-24 11:15:13 +00:00
parent 3f6937d347
commit 1b8c225dc1
1 changed files with 4 additions and 2 deletions
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6
lib/libc/sys/sigaction.2
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@ -437,10 +437,12 @@ functions when called from a signal handler is undefined.
In general though, signal handlers should do little more than set a
flag; most other actions are not safe.
.Pp
As well, inside the signal handler it is also considered more safe to
make a copy the global variable
Also, it is good practice to make a copy of the global variable
.Va errno
and restore it before returning from the signal handler.
This protects against the side effect of
.Va errno
being set by functions called from inside the signal handler.
.Sh RETURN VALUES
A 0 value indicated that the call succeeded. A \-1 return value
indicates an error occurred and