/* vi: set sw=4 ts=4: */ /* * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* * Based in part on the files * ./sysdeps/unix/sysv/linux/pwrite.c, * ./sysdeps/unix/sysv/linux/pread.c, * sysdeps/posix/pread.c * sysdeps/posix/pwrite.c * from GNU libc 2.2.5, but reworked considerably... */ #include <sys/syscall.h> #include <unistd.h> #include <stdint.h> #include <endian.h> extern __typeof(pread) __libc_pread; extern __typeof(pwrite) __libc_pwrite; #ifdef __UCLIBC_HAS_LFS__ extern __typeof(pread64) __libc_pread64; extern __typeof(pwrite64) __libc_pwrite64; #endif #include <bits/kernel_types.h> #ifdef __NR_pread64 /* Newer kernels renamed but it's the same. */ # ifdef __NR_pread # error "__NR_pread and __NR_pread64 both defined???" # endif # define __NR_pread __NR_pread64 #endif #ifdef __NR_pread # define __NR___syscall_pread __NR_pread /* On Xtensa, 64-bit values are aligned in even/odd register pairs. */ static __inline__ _syscall6(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count, int, pad, off_t, offset_hi, off_t, offset_lo) ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset) { return __syscall_pread(fd, buf, count, 0, __LONG_LONG_PAIR(offset >> 31, offset)); } weak_alias(__libc_pread,pread) # ifdef __UCLIBC_HAS_LFS__ ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset) { uint32_t low = offset & 0xffffffff; uint32_t high = offset >> 32; return __syscall_pread(fd, buf, count, 0, __LONG_LONG_PAIR(high, low)); } weak_alias(__libc_pread64,pread64) # endif /* __UCLIBC_HAS_LFS__ */ #endif /* __NR_pread */ #ifdef __NR_pwrite64 /* Newer kernels renamed but it's the same. */ # ifdef __NR_pwrite # error "__NR_pwrite and __NR_pwrite64 both defined???" # endif # define __NR_pwrite __NR_pwrite64 #endif #ifdef __NR_pwrite # define __NR___syscall_pwrite __NR_pwrite /* On Xtensa, 64-bit values are aligned in even/odd register pairs. */ static __inline__ _syscall6(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count, int, pad, off_t, offset_hi, off_t, offset_lo) ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset) { return __syscall_pwrite(fd, buf, count, 0, __LONG_LONG_PAIR(offset >> 31, offset)); } weak_alias(__libc_pwrite,pwrite) # ifdef __UCLIBC_HAS_LFS__ ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset) { uint32_t low = offset & 0xffffffff; uint32_t high = offset >> 32; return __syscall_pwrite(fd, buf, count, 0, __LONG_LONG_PAIR(high, low)); } weak_alias(__libc_pwrite64,pwrite64) # endif /* __UCLIBC_HAS_LFS__ */ #endif /* __NR_pwrite */