From 9d101732ad0609f2f19ef20062a00cd26b01d859 Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Tue, 26 Apr 2011 23:03:44 +0200 Subject: add posix_madvise.c Signed-off-by: Peter S. Mazinger Signed-off-by: Bernhard Reutner-Fischer --- libc/sysdeps/linux/common/posix_madvise.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 libc/sysdeps/linux/common/posix_madvise.c (limited to 'libc/sysdeps/linux/common/posix_madvise.c') diff --git a/libc/sysdeps/linux/common/posix_madvise.c b/libc/sysdeps/linux/common/posix_madvise.c new file mode 100644 index 000000000..2f95bcba7 --- /dev/null +++ b/libc/sysdeps/linux/common/posix_madvise.c @@ -0,0 +1,25 @@ +/* vi: set sw=4 ts=4: */ +/* Licensed under the LGPL v2.1, see the file LICENSE in this tarball. */ + +#include +#include + +#if defined __NR_madvise && defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ +int posix_madvise(void *addr, size_t len, int advice) +{ + int result; + /* We have one problem: the kernel's MADV_DONTNEED does not + * correspond to POSIX's POSIX_MADV_DONTNEED. The former simply + * discards changes made to the memory without writing it back to + * disk, if this would be necessary. The POSIX behaviour does not + * allow this. There is no functionality mapping for the POSIX + * behaviour so far so we ignore that advice for now. */ + if (advice == POSIX_MADV_DONTNEED) + return 0; + + /* this part might use madvise function */ + INTERNAL_SYSCALL_DECL (err); + result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice); + return INTERNAL_SYSCALL_ERRNO (result, err); +} +#endif -- cgit v1.2.3