The current uclibc-ng use 4 arguments, and this will cause ltp-testsuite's preadv/pwritev case failed. The syscall of preadv/pwritev in current linux-kernel is 5 arguments: linux/fs/read_write.c: SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) So just update to 5-args-syscall, and off_t could be 32bit or 64bit. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/preadv.c | 7 ++++++- libc/sysdeps/linux/common/pwritev.c | 7 ++++++- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/libc/sysdeps/linux/common/preadv.c b/libc/sysdeps/linux/common/preadv.c index b90291b..fd9dde4 100644 --- a/libc/sysdeps/linux/common/preadv.c +++ b/libc/sysdeps/linux/common/preadv.c @@ -23,6 +23,11 @@ ssize_t preadv (int fd, const struct iovec *vector, int count, off_t offset) { - return INLINE_SYSCALL (preadv, 4, fd, vector, count, offset); + unsigned long pos_l, pos_h; + + pos_h = (unsigned long)((long long)offset >> 32); + pos_l = (unsigned long)((long long)offset); + + return INLINE_SYSCALL (preadv, 5, fd, vector, count, pos_l, pos_h); } #endif diff --git a/libc/sysdeps/linux/common/pwritev.c b/libc/sysdeps/linux/common/pwritev.c index a1880ed..bef5bcf 100644 --- a/libc/sysdeps/linux/common/pwritev.c +++ b/libc/sysdeps/linux/common/pwritev.c @@ -23,6 +23,11 @@ ssize_t pwritev (int fd, const struct iovec *vector, int count, off_t offset) { - return INLINE_SYSCALL (pwritev, 4, fd, vector, count, offset); + unsigned long pos_l, pos_h; + + pos_h = (unsigned long)((long long)offset >> 32); + pos_l = (unsigned long)((long long)offset); + + return INLINE_SYSCALL (pwritev, 5, fd, vector, count, pos_l, pos_h); } #endif -- 2.7.4