diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/sigaction.2 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2 index 1d1c98f..51bd2b9 100644 --- a/lib/libc/sys/sigaction.2 +++ b/lib/libc/sys/sigaction.2 @@ -418,9 +418,29 @@ Realtime Interfaces: .Fn sigset , .Fn timer_settime . .Pp +ANSI C Interfaces: +.Pp +.Fn strcpy , +.Fn strcat , +.Fn strncpy , +.Fn strncat , +and perhaps some others. +.Pp +Extension Interfaces: +.Pp +.Fn strlcpy , +.Fn strlcat . +.Pp All functions not in the above lists are considered to be unsafe with respect to signals. That is to say, the behaviour of such 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 +.Va errno +and restore it before returning from the signal handler. .Sh RETURN VALUES A 0 value indicated that the call succeeded. A \-1 return value indicates an error occurred and |
