Date: Wed, 21 Apr 2010 11:09:13 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r206990 - stable/8/lib/libc/sys Message-ID: <201004211109.o3LB9DQO035114@svn.freebsd.org>
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Author: kib Date: Wed Apr 21 11:09:13 2010 New Revision: 206990 URL: http://svn.freebsd.org/changeset/base/206990 Log: MFC r206549: Align the declaration for sa_sigaction with POSIX. MFC r206649: Still reference struct __sigaction with clarification when this form of argument declaration is needed. MFC r206802: Revert r206649. Simplify the presented declaration of struct sigaction. Modified: stable/8/lib/libc/sys/sigaction.2 Directory Properties: stable/8/lib/libc/ (props changed) stable/8/lib/libc/stdtime/ (props changed) Modified: stable/8/lib/libc/sys/sigaction.2 ============================================================================== --- stable/8/lib/libc/sys/sigaction.2 Wed Apr 21 10:21:34 2010 (r206989) +++ stable/8/lib/libc/sys/sigaction.2 Wed Apr 21 11:09:13 2010 (r206990) @@ -28,7 +28,7 @@ .\" From: @(#)sigaction.2 8.2 (Berkeley) 4/3/94 .\" $FreeBSD$ .\" -.Dd June 7, 2004 +.Dd April 18, 2010 .Dt SIGACTION 2 .Os .Sh NAME @@ -40,16 +40,11 @@ .In signal.h .Bd -literal struct sigaction { - union { - void (*__sa_handler)(int); - void (*__sa_sigaction)(int, struct __siginfo *, void *); - } __sigaction_u; /* signal handler */ + void (*sa_handler)(int); + void (*sa_sigaction)(int, siginfo_t *, void *); int sa_flags; /* see signal options below */ sigset_t sa_mask; /* signal mask to apply */ }; - -#define sa_handler __sigaction_u.__sa_handler -#define sa_sigaction __sigaction_u.__sa_sigaction .Ed .Ft int .Fo sigaction @@ -148,6 +143,16 @@ If is non-zero, the previous handling information for the signal is returned to the user. .Pp +The above declaration of +.Vt "struct sigaction" +is not literal. +It is provided only to list the accessible members. +See +.In sys/signal.h +for the actual definition. +In particular, the storage occupied by sa_handler and sa_sigaction overlaps, +and an application can not use both simultaneously. +.Pp Once a signal handler is installed, it normally remains installed until another .Fn sigaction
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