/* vi: set sw=4 ts=4: */ /* * lseek() for uClibc * * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ #include <sys/syscall.h> #include <unistd.h> #include <cancel.h> #ifdef __NR_lseek # define __NR___lseek_nocancel __NR_lseek _syscall3(off_t, __NC(lseek), int, fd, off_t, offset, int, whence) /* Use lseek64 if __NR_lseek is not defined but UCLIBC_HAS_LFS is enabled */ #elif !defined __NR_lseek && defined __NR_llseek #include <endian.h> off_t __NC(lseek)(int fd, off_t offset, int whence) { #if defined __UCLIBC_HAS_LFS__ return lseek64(fd, offset, whence); #elif __WORDSIZE == 32 __off64_t result; __off_t high = 0; return INLINE_SYSCALL(llseek, 5, fd, high, offset, &result, whence) ?: result; #endif /* No need to handle __WORDSIZE == 64 as such a kernel won't define __NR_llseek */ } #else # include <errno.h> off_t __NC(lseek)(int fd, off_t offset attribute_unused, int whence) { if (fd < 0) { __set_errno(EBADF); return -1; } switch(whence) { case SEEK_SET: case SEEK_CUR: case SEEK_END: break; default: __set_errno(EINVAL); return -1; } __set_errno(ENOSYS); return -1; } #endif CANCELLABLE_SYSCALL(off_t, lseek, (int fd, off_t offset, int whence), (fd, offset, whence)) lt_libc_hidden(lseek) #if defined __UCLIBC_HAS_LFS__ && (__WORDSIZE == 64 || (!defined __NR__llseek && !defined __NR_llseek)) strong_alias_untyped(__NC(lseek),__NC(lseek64)) strong_alias_untyped(lseek,lseek64) lt_strong_alias(lseek64) lt_libc_hidden(lseek64) #endif