diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/sys/sigaction.2 | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2 index 51bd2b9..1e508c8 100644 --- a/lib/libc/sys/sigaction.2 +++ b/lib/libc/sys/sigaction.2 @@ -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 |
