From 94df87ef9b6d4f47ccb5add0e332849262f5a662 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx.manpages@gmail.com>
Date: Mon, 10 May 2021 19:55:40 +0200
Subject: [PATCH] pidfd_send_signal.2: Use syscall(SYS_...); for system calls
 without a wrapper. Fix includes too

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/pidfd_send_signal.2 | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/man2/pidfd_send_signal.2 b/man2/pidfd_send_signal.2
index b025e22a0..12412c6d8 100644
--- a/man2/pidfd_send_signal.2
+++ b/man2/pidfd_send_signal.2
@@ -27,14 +27,21 @@
 pidfd_send_signal \- send a signal to a process specified by a file descriptor
 .SH SYNOPSIS
 .nf
-.B "#include <signal.h>"
+.BR "#include <linux/signal.h>" "     /* Definition of " SIG* " constants */"
+.BR "#include <signal.h>" "           /* Definition of " SI_* " constants */"
+.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
+.B #include <unistd.h>
 .PP
-.BI "int pidfd_send_signal(int " pidfd ", int " sig ", siginfo_t *" info ,
+.BI "int syscall(SYS_pidfd_send_signal, int " pidfd ", int " sig \
+", siginfo_t *" info ,
 .BI "                      unsigned int " flags );
 .fi
 .PP
 .IR Note :
-There is no glibc wrapper for this system call; see NOTES.
+glibc provides no wrapper for
+.BR pidfd_send_signal (),
+necessitating the use of
+.BR syscall (2).
 .SH DESCRIPTION
 The
 .BR pidfd_send_signal ()
@@ -136,9 +143,6 @@ first appeared in Linux 5.1.
 .BR pidfd_send_signal ()
 is Linux specific.
 .SH NOTES
-Glibc does not provide a wrapper for this system call; call it using
-.BR syscall (2).
-.\"
 .SS PID file descriptors
 The
 .I pidfd