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Message-Id: <20230109084208.27355-22-w@1wt.eu>
Date: Mon, 9 Jan 2023 09:42:07 +0100
From: Willy Tarreau <w@....eu>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-kernel@...r.kernel.org, Ammar Faizi <ammarfaizi2@...weeb.org>
Subject: [PATCH 21/22] nolibc/sys: Implement `getpagesize(2)` function
From: Ammar Faizi <ammarfaizi2@...weeb.org>
This function returns the page size used by the running kernel. The
page size value is taken from the auxiliary vector at 'AT_PAGESZ' key.
'getpagesize(2)' is assumed as a syscall becuase the manpage placement
of this function is in entry 2 ('man 2 getpagesize') despite there is
no real 'getpagesize(2)' syscall in the Linux syscall table. Define
this function in 'sys.h'.
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
---
tools/include/nolibc/sys.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 47bf67668860..b5f8cd35c03b 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -19,6 +19,7 @@
#include <linux/fs.h>
#include <linux/loop.h>
#include <linux/time.h>
+#include <linux/auxvec.h>
#include "arch.h"
#include "errno.h"
@@ -499,6 +500,26 @@ pid_t gettid(void)
return sys_gettid();
}
+static unsigned long getauxval(unsigned long key);
+
+/*
+ * long getpagesize(void);
+ */
+
+static __attribute__((unused))
+long getpagesize(void)
+{
+ long ret;
+
+ ret = getauxval(AT_PAGESZ);
+ if (!ret) {
+ SET_ERRNO(ENOENT);
+ return -1;
+ }
+
+ return ret;
+}
+
/*
* int gettimeofday(struct timeval *tv, struct timezone *tz);
--
2.17.5
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