diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/sigqueue.2 | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/lib/libc/sys/sigqueue.2 b/lib/libc/sys/sigqueue.2 index 04e101b..8377c67 100644 --- a/lib/libc/sys/sigqueue.2 +++ b/lib/libc/sys/sigqueue.2 @@ -27,7 +27,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 10, 2012 +.Dd May 5, 2017 .Dt SIGQUEUE 2 .Os .Sh NAME @@ -129,7 +129,6 @@ does not exist. .Xr kill 2 , .Xr sigaction 2 , .Xr sigpending 2 , -.Xr sigqueue 2 , .Xr sigsuspend 2 , .Xr sigtimedwait 2 , .Xr sigwait 2 , @@ -147,3 +146,18 @@ Support for .Tn POSIX realtime signal queue first appeared in .Fx 7.0 . +.Sh CAVEATS +When using +.Nm +to send signals to a process which might have a different ABI +(for instance, one is 32-bit and the other 64-bit), +the +.Va sival_int +member of +.Fa value +can be delivered reliably, but the +.Va sival_ptr +may be truncated in endian dependent ways and must not be relied on. +Further, many pointer integrity schemes disallow sending pointers to other +processes, and this technique should not be used in programs intended to +be portable. |
