Commit 7efd762e authored Jan 10, 2023 by Ammar Faizi Committed by Paul E. McKenney Jan 10, 2023

nolibc/sys: Implement `getpagesize(2)` function



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@gnuweeb.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

parent c61a0780

tools/include/nolibc/sys.h

+21 −0

Original line number	Diff line number	Diff line
		@@ -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);