/* 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 <endian.h> #include <bits/wordsize.h> #include <cancel.h> #ifdef __NR_pread64 # undef __NR_pread # define __NR_pread __NR_pread64 #endif #ifdef __NR_pwrite64 # undef __NR_pwrite # define __NR_pwrite __NR_pwrite64 #endif #ifndef MY_PREAD # ifdef __NR_pread # define __NR___syscall_pread __NR_pread # if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) static _syscall6(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count, int, dummy, off_t, offset_hi, off_t, offset_lo) # define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, 0, OFF_HI_LO(offset)) # define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, 0, OFF64_HI_LO(offset)) # elif __WORDSIZE == 32 static _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count, off_t, offset_hi, off_t, offset_lo) # define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, OFF_HI_LO(offset)) # define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, OFF64_HI_LO(offset)) # else static _syscall4(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count, off_t, offset) # define MY_PREAD(fd, buf, count, offset) __syscall_pread(fd, buf, count, offset) # define MY_PREAD64(fd, buf, count, offset) __syscall_pread(fd, buf, count, offset) # endif # endif #endif #ifndef MY_PWRITE # ifdef __NR_pwrite # define __NR___syscall_pwrite __NR_pwrite # if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) static _syscall6(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count, int, dummy, off_t, offset_hi, off_t, offset_lo) # define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, 0, OFF_HI_LO(offset)) # define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, 0, OFF64_HI_LO(offset)) # elif __WORDSIZE == 32 static _syscall5(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count, off_t, offset_hi, off_t, offset_lo) # define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, OFF_HI_LO(offset)) # define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, OFF64_HI_LO(offset)) # else static _syscall4(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count, off_t, offset) # define MY_PWRITE(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, offset) # define MY_PWRITE64(fd, buf, count, offset) __syscall_pwrite(fd, buf, count, offset) # endif # endif #endif static ssize_t __NC(pread)(int fd, void *buf, size_t count, off_t offset) { return MY_PREAD(fd, buf, count, offset); } CANCELLABLE_SYSCALL(ssize_t, pread, (int fd, void *buf, size_t count, off_t offset), (fd, buf, count, offset)) static ssize_t __NC(pwrite)(int fd, const void *buf, size_t count, off_t offset) { return MY_PWRITE(fd, buf, count, offset); } CANCELLABLE_SYSCALL(ssize_t, pwrite, (int fd, const void *buf, size_t count, off_t offset), (fd, buf, count, offset)) #ifdef __UCLIBC_HAS_LFS__ # if __WORDSIZE == 32 static ssize_t __NC(pread64)(int fd, void *buf, size_t count, off64_t offset) { return MY_PREAD64(fd, buf, count, offset); } CANCELLABLE_SYSCALL(ssize_t, pread64, (int fd, void *buf, size_t count, off64_t offset), (fd, buf, count, offset)) static ssize_t __NC(pwrite64)(int fd, const void *buf, size_t count, off64_t offset) { return MY_PWRITE64(fd, buf, count, offset); } CANCELLABLE_SYSCALL(ssize_t, pwrite64, (int fd, const void *buf, size_t count, off64_t offset), (fd, buf, count, offset)) # else # ifdef __LINUXTHREADS_OLD__ weak_alias(pread,pread64) weak_alias(pwrite,pwrite64) lt_strong_alias(pread64) lt_strong_alias(pwrite64) # else strong_alias_untyped(pread,pread64) strong_alias_untyped(pwrite,pwrite64) # endif # endif #endif