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- /* 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
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