From: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
Side note:
This function calls 'getauxval(3)' function that's defined in
'stdlib.h', but since most functions in 'stdlib.h' needs 'sys.h', the
'sys.h' is always included first. Therefore, we need a forward
declaration of 'getauxval(3)' in sys.h.
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 3db1dd8c74ee..acf7cf438010 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -18,6 +18,7 @@
#include <linux/fs.h>
#include <linux/loop.h>
#include <linux/time.h>
+#include <linux/auxvec.h>
#include "arch.h"
#include "errno.h"
@@ -498,6 +499,26 @@ 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);
--
Ammar Faizi
