diff options
| -rw-r--r-- | lib/libc/gen/setjmp.3 | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/libc/gen/setjmp.3 b/lib/libc/gen/setjmp.3 index bf27c5ff991..3ecef8e42e4 100644 --- a/lib/libc/gen/setjmp.3 +++ b/lib/libc/gen/setjmp.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: setjmp.3,v 1.12 2001/01/12 21:28:19 millert Exp $ +.\" $OpenBSD: setjmp.3,v 1.13 2001/11/20 18:59:08 deraadt Exp $ .\" .\" Copyright (c) 1990, 1991, 1993 .\" The Regents of the University of California. All rights reserved. @@ -203,3 +203,25 @@ functions and do not restore the signal mask. Because of this discrepancy, the .Fn sigsetjmp Ns / Ns Fn siglongjmp interfaces should be used if portability is desired. +.Pp +Use of +.Fn longjmp +or +.Fn siglongjmp +from inside a signal handler is not as easy as it might seem. +Generally speaking, all possible code paths between the +.Fn setjmp +and +.Fn longjmp +must be signal race safe, as discussed in +.Xr signal 3 . +Furthermore, the code paths must not do resource management +(such as +.Xr open 2 +or +.Xr close 2 ) +without blocking the signal in question, or resources might +be mismanaged. +Obviously this makes +.Fn longjmp +much less useful than previously thought. |