diff options
| author |   deraadt <deraadt@openbsd.org> | 2003-02-03 21:20:40 +0000 |
|---|---|---|
| committer | deraadt <deraadt@openbsd.org> | 2003-02-03 21:20:40 +0000 |
| commit | 81f7948bbabc4aeb86718e187b53724d2dc5cffc (patch) | |
| tree | f40c9058db870410f4608b32a691ba179913772e /lib/libc | |
| parent | pad tx buffer out to minimum framelength; based on NetBSD (diff) | |
| download | wireguard-openbsd-81f7948bbabc4aeb86718e187b53724d2dc5cffc.tar.xz wireguard-openbsd-81f7948bbabc4aeb86718e187b53724d2dc5cffc.zip | |
some more functions that are (only on OpenBSD) safe in signal handlers.
not having access to these makes things really painful
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/gen/signal.3 | 18 | ||||
| -rw-r--r-- | lib/libc/sys/sigaction.2 | 19 |
2 files changed, 33 insertions, 4 deletions
diff --git a/lib/libc/gen/signal.3 b/lib/libc/gen/signal.3 index 550e3e5e46a..98248f5bac4 100644 --- a/lib/libc/gen/signal.3 +++ b/lib/libc/gen/signal.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: signal.3,v 1.18 2002/04/30 16:31:42 mpech Exp $ +.\" $OpenBSD: signal.3,v 1.19 2003/02/03 21:20:47 deraadt Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 .\" The Regents of the University of California. All rights reserved. @@ -337,7 +337,7 @@ Extension Interfaces: .Fn strlcat , .Fn syslog_r . .Pp -All functions not in the above lists are considered to be unsafe +Most 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. @@ -348,6 +348,20 @@ 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. +.Pp +A few other functions are signal race safe in +.Ox +but probably not on other systems: +.Pp +.Bl -tag -offset indent -compact -width foofoofoofoo +.It Fn snprintf +Safe as long as $n positional arguments are not used. +.It Fn syslog_r +Safe if the +.Va syslog_data +struct is initialized as a local variable. +.El +.Pp .Sh RETURN VALUES The previous action is returned on a successful call. Otherwise, diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2 index fc41bf91dac..fff21e5d55d 100644 --- a/lib/libc/sys/sigaction.2 +++ b/lib/libc/sys/sigaction.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sigaction.2,v 1.33 2002/04/30 16:31:42 mpech Exp $ +.\" $OpenBSD: sigaction.2,v 1.34 2003/02/03 21:20:40 deraadt Exp $ .\" $NetBSD: sigaction.2,v 1.7 1995/10/12 15:41:16 jtc Exp $ .\" .\" Copyright (c) 1980, 1990, 1993 @@ -695,7 +695,8 @@ Extension Interfaces: .Fn strlcpy , .Fn strlcat . .Pp -All functions not in the above lists are considered to be unsafe +.Pp +Most 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. @@ -704,6 +705,20 @@ 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. +.Pp +A few other functions are signal race safe in +.Ox +but probably not on other systems: +.Pp +.Bl -tag -offset indent -compact -width foofoofoofoo +.It Fn snprintf +Safe as long as $n positional arguments are not used. +.It Fn syslog_r +Safe if the +.Va syslog_data +struct is initialized as a local variable. +.El +.Pp .Sh SEE ALSO .Xr kill 1 , .Xr kill 2 , |