From: Ammar Faizi ammarfaizi2@gnuweeb.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@gnuweeb.org ---
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);