From 65dfda3dd16da5cff236c4a84532ec40d7533578 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx.manpages@gmail.com>
Date: Sat, 15 May 2021 20:20:28 +0200
Subject: [PATCH] sched_setattr.2: Use syscall(SYS_...); for system calls
 without a wrapper

Document also why each header is required

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

diff --git a/man2/sched_setattr.2 b/man2/sched_setattr.2
index 545558a4e..1c24c65d3 100644
--- a/man2/sched_setattr.2
+++ b/man2/sched_setattr.2
@@ -29,17 +29,21 @@ sched_setattr, sched_getattr \-
 set and get scheduling policy and attributes
 .SH SYNOPSIS
 .nf
-.B #include <sched.h>
+.BR "#include <sched.h>" "            /* Definition of " SCHED_* " constants */"
+.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
+.B #include <unistd.h>
 .PP
-.BI "int sched_setattr(pid_t " pid ", struct sched_attr *" attr ,
-.BI "                  unsigned int " flags );
-.BI "int sched_getattr(pid_t " pid ", struct sched_attr *" attr ,
-.BI "                  unsigned int " size ", unsigned int " flags );
+.BI "int syscall(SYS_sched_setattr, pid_t " pid ", struct sched_attr *" attr ,
+.BI "            unsigned int " flags );
+.BI "int syscall(SYS_sched_getattr, pid_t " pid ", struct sched_attr *" attr ,
+.BI "            unsigned int " size ", unsigned int " flags );
 .fi
 .\" FIXME . Add feature test macro requirements
 .PP
 .IR Note :
-There are no glibc wrappers for these system calls; see NOTES.
+glibc provides no wrappers for these system calls,
+necessitating the use of
+.BR syscall (2).
 .SH DESCRIPTION
 .SS sched_setattr()
 The