ssize_t pread(int fd, void *buf, size_t size, off_t ofs)
{
if (smbw_fd(fd)) {
return smbw_pread(fd, buf, size, ofs);
}
return real_pread(fd, buf, size, ofs);
}
ssize_t pread(int fd, void *buf, size_t count, off_t offset) {
if (nfs_fd_list[fd].is_nfs == 1) {
int ret;
LD_NFS_DPRINTF(9, "pread(fd:%d offset:%d count:%d)", fd,
(int)offset, (int)count);
if ((ret = nfs_pread(nfs_fd_list[fd].nfs, nfs_fd_list[fd].fh,
offset, count, buf)) < 0) {
errno = -ret;
return -1;
}
return ret;
}
return real_pread(fd, buf, count, offset);
}
ssize_t HdfsFile::read(void *ptr, size_t count)
{
boost::mutex::scoped_lock lock(m_mutex);
int savedErrno;
tOffset offset = tell();
if (offset < 0)
return offset;
/* May get a performance boost by implementing read() s.t. it
doesn't require a seek afterward, but probably not though. */
ssize_t numRead = real_pread(ptr, offset, count);
savedErrno = errno;
if (numRead > 0)
hdfsSeek(m_fs, m_file, offset + numRead);
errno = savedErrno;
return numRead;
}
ssize_t pread(int fd, void *buf, size_t count, off_t offset) {
if ((iscsi_fd_list[fd].is_iscsi == 1 && iscsi_fd_list[fd].in_flight == 0)) {
off_t old_offset;
if ((old_offset = lseek(fd, 0, SEEK_CUR)) < 0) {
errno = EIO;
return -1;
}
if (lseek(fd, offset, SEEK_SET) < 0) {
return -1;
}
if (read(fd, buf, count) < 0) {
lseek(fd, old_offset, SEEK_SET);
return -1;
}
lseek(fd, old_offset, SEEK_SET);
return count;
}
return real_pread(fd, buf, count, offset);
}
ssize_t HdfsFile::pread(void *ptr, off64_t offset, size_t count)
{
boost::mutex::scoped_lock lock(m_mutex);
return real_pread(ptr, offset, count);
}
