diff options
Diffstat (limited to 'libc/sysdeps/linux/common/posix_madvise.c')
| -rw-r--r-- | libc/sysdeps/linux/common/posix_madvise.c | 25 |
1 files changed, 25 insertions, 0 deletions
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 <sys/mman.h> +#include <sys/syscall.h> + +#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 |