Move definition of struct sched_attr to a separate header file

Avoid multiple defintions of struct sched_attr by creating a separate
header file with its definition and using it in other places.

* sched_attr.h: New file.
* Makefile.am (strace_SOURCES): Add it.
* sched.c: Include it.
(print_sched_attr): Use it.
* tests/sched_xetattr.c: Include it.
(main): Use it.

Makefile.am

@@ -211,6 +211,7 @@ strace_SOURCES =	\
 	resource.c	\
 	rtc.c		\
 	sched.c		\
+	sched_attr.h	\
 	scsi.c		\
 	seccomp.c	\
 	seccomp_fprog.h \

sched.c

@@ -30,6 +30,7 @@
 #include "defs.h"
 
 #include <sched.h>
+#include "sched_attr.h"
 
 #include "xlat/schedulers.h"
 #include "xlat/sched_flags.h"
@@ -97,16 +98,7 @@ static void
 print_sched_attr(struct tcb *const tcp, const kernel_ulong_t addr,
 		 unsigned int size)
 {
-	struct {
+	struct sched_attr attr = {};
-		uint32_t size;
-		uint32_t sched_policy;
-		uint64_t sched_flags;
-		uint32_t sched_nice;
-		uint32_t sched_priority;
-		uint64_t sched_runtime;
-		uint64_t sched_deadline;
-		uint64_t sched_period;
-	} attr = {};
 
 	if (size > sizeof(attr))
 		size = sizeof(attr);

sched_attr.h

@@ -0,0 +1,19 @@
+#ifndef STRACE_SCHED_ATTR_H
+#define STRACE_SCHED_ATTR_H
+
+# include <stdint.h>
+
+struct sched_attr {
+	uint32_t size;
+	uint32_t sched_policy;
+	uint64_t sched_flags;
+	uint32_t sched_nice;
+	uint32_t sched_priority;
+	uint64_t sched_runtime;
+	uint64_t sched_deadline;
+	uint64_t sched_period;
+};
+
+# define SCHED_ATTR_MIN_SIZE	48
+
+#endif /* !STRACE_SCHED_ATTR_H */

tests/sched_xetattr.c

@@ -34,6 +34,7 @@
 # include <stdio.h>
 # include <sched.h>
 # include <unistd.h>
+# include "sched_attr.h"
 # include "xlat.h"
 # include "xlat/schedulers.h"
 
@@ -66,16 +67,7 @@ main(void)
 	static const kernel_ulong_t bogus_flags =
 		(kernel_ulong_t) 0xdefaceddeadc0deULL;
 
-	struct {
+	struct sched_attr *const attr = tail_alloc(sizeof(*attr));
-		uint32_t size;
-		uint32_t sched_policy;
-		uint64_t sched_flags;
-		int32_t  sched_nice;
-		uint32_t sched_priority;
-		uint64_t sched_runtime;
-		uint64_t sched_deadline;
-		uint64_t sched_period;
-	} *const attr = tail_alloc(sizeof(*attr));
 	void *const efault = attr + 1;
 
 	sys_sched_getattr(bogus_pid, 0, 0, 0);