From: Ricardo Branco <rbranco@suse.de>
Subject: Add POSIX psiginfo(3) call
To: tech@openbsd.org
Date: Wed, 16 Apr 2025 10:18:54 +0200

For now use the same implementation used by NetBSD & DragonflyBSD.


Attached patch.


Best,

Ricardo
diff --git include/signal.h include/signal.h
index 07982bd75a1..7506ef0fbe7 100644
--- include/signal.h
+++ include/signal.h
@@ -132,6 +132,7 @@ int	thrkill(pid_t _tid, int _signum, void *_tcb);
 int	sigwait(const sigset_t *__restrict, int *__restrict);
 #endif
 #if __BSD_VISIBLE ||  __POSIX_VISIBLE >= 200809
+void	psiginfo(const siginfo_t *, const char *);
 void	psignal(unsigned int, const char *);
 #endif
 #endif /* __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE */
diff --git lib/libc/gen/psignal.3 lib/libc/gen/psignal.3
index 3fd2ebbf7bf..015e968a107 100644
--- lib/libc/gen/psignal.3
+++ lib/libc/gen/psignal.3
@@ -27,11 +27,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: May 16 2019 $
+.Dd $Mdocdate: Apr 16 2025 $
 .Dt PSIGNAL 3
 .Os
 .Sh NAME
 .Nm psignal ,
+.Nm psiginfo ,
 .Nm sys_siglist ,
 .Nm sys_signame
 .Nd system signal messages
@@ -39,6 +40,7 @@
 .In signal.h
 .Ft void
 .Fn psignal "unsigned int sig" "const char *s"
+.Fn psiginfo "const siginfo_t *si" "const char *s"
 .Vt extern char *sys_siglist[];
 .Vt extern char *sys_signame[];
 .Sh DESCRIPTION
@@ -64,6 +66,16 @@ the string
 .Dq Unknown signal
 is produced.
 .Pp
+The
+.Fn psiginfo
+function is similar to
+.Fn psignal ,
+except that the signal number information is taken from the
+.Fa si
+argument which is a
+.Vt siginfo_t
+structure.
+.Pp
 The message strings can be accessed directly using the external array
 .Va sys_siglist ,
 indexed by recognized signal numbers.
@@ -87,6 +99,13 @@ The
 .Fn psignal
 function appeared in
 .Bx 4.2 .
+The
+.Fn psiginfo
+function appeared in
+.Fx 15.0 ,
+.Nx 6.0 ,
+and
+.Dx 4.1 .
 .Sh CAVEATS
 On systems other than
 .Ox ,
diff --git lib/libc/gen/psignal.c lib/libc/gen/psignal.c
index dca921d5a5a..ee70d8c95cc 100644
--- lib/libc/gen/psignal.c
+++ lib/libc/gen/psignal.c
@@ -61,3 +61,9 @@ psignal(unsigned int sig, const char *s)
 	iov[niov+1].iov_len = 1;
 	(void)writev(STDERR_FILENO, iov, niov+2);
 }
+
+void
+psiginfo(const siginfo_t *si, const char *s)
+{
+	psignal(si->si_signo, s);
+}