Add POSIX psiginfo(3) call

PR:	286133

(cherry picked from commit 3b2f0bfc35)

include/signal.h

@@ -117,6 +117,7 @@ int	siginterrupt(int, int);
 #endif
 
 #if __POSIX_VISIBLE >= 200809
+void	psiginfo(const siginfo_t *, const char *);
 void	psignal(int, const char *);
 #endif
 

lib/libc/gen/Makefile.inc

@@ -487,7 +487,8 @@ MLINKS+=posix_spawn.3 posix_spawnp.3 \
 	posix_spawnattr_getsigdefault.3 posix_spawnattr_setsigdefault.3 \
 	posix_spawnattr_getsigmask.3 posix_spawnattr_setsigmask.3 \
 	posix_spawnattr_init.3 posix_spawnattr_destroy.3
-MLINKS+=psignal.3 strsignal.3 \
+MLINKS+=psignal.3 psiginfo.3 \
+	psignal.3 strsignal.3 \
 	psignal.3 sys_siglist.3 \
 	psignal.3 sys_signame.3
 MLINKS+=pwcache.3 group_from_gid.3 \

lib/libc/gen/Symbol.map

@@ -461,6 +461,7 @@ FBSD_1.8 {
 	aio_read2;
 	aio_write2;
 	execvpe;
+	psiginfo;
 	rtld_get_var;
 	rtld_set_var;
 };

lib/libc/gen/psignal.3

@@ -27,11 +27,12 @@
 .\"
 .\"     @(#)psignal.3	8.2 (Berkeley) 2/27/95
 .\"
-.Dd May 30, 2016
+.Dd Apr 16, 2025
 .Dt PSIGNAL 3
 .Os
 .Sh NAME
 .Nm psignal ,
+.Nm psiginfo ,
 .Nm strsignal ,
 .Nm sys_siglist ,
 .Nm sys_signame
@@ -42,6 +43,8 @@
 .In signal.h
 .Ft void
 .Fn psignal "int sig" "const char *s"
+.Ft void
+.Fn psiginfo "const siginfo_t *si" "const char *s"
 .Vt extern const char * const sys_siglist[] ;
 .Vt extern const char * const sys_signame[] ;
 .In string.h
@@ -81,6 +84,16 @@ 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
 through the external array
 .Va sys_siglist ,
@@ -106,3 +119,10 @@ 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 .

lib/libc/gen/psignal.c

@@ -57,3 +57,9 @@ psignal(int sig, const char *s)
 	(void)_write(STDERR_FILENO, c, strlen(c));
 	(void)_write(STDERR_FILENO, "\n", 1);
 }
+
+void
+psiginfo(const siginfo_t *si, const char *s)
+{
+	psignal(si->si_signo, s);
+}