static NTSTATUS cmd_read(struct vfs_state *vfs, TALLOC_CTX *mem_ctx, int argc, const char **argv)
{
int fd;
size_t size, rsize;
if (argc != 3) {
printf("Usage: read <fd> <size>\n");
return NT_STATUS_OK;
}
/* do some error checking on these */
fd = atoi(argv[1]);
size = atoi(argv[2]);
vfs->data = (char *)talloc(mem_ctx, size);
if (vfs->data == NULL) {
printf("read: error=-1 (not enough memory)");
return NT_STATUS_UNSUCCESSFUL;
}
vfs->data_size = size;
rsize = SMB_VFS_READ(vfs->files[fd], fd, vfs->data, size);
if (rsize == -1) {
printf("read: error=%d (%s)\n", errno, strerror(errno));
return NT_STATUS_UNSUCCESSFUL;
}
printf("read: ok\n");
return NT_STATUS_OK;
}
ssize_t vfswrap_pread(vfs_handle_struct *handle, files_struct *fsp, int fd, void *data,
size_t n, SMB_OFF_T offset)
{
ssize_t result;
#if defined(HAVE_PREAD) || defined(HAVE_PREAD64)
START_PROFILE_BYTES(syscall_pread, n);
result = sys_pread(fd, data, n, offset);
END_PROFILE(syscall_pread);
if (result == -1 && errno == ESPIPE) {
/* Maintain the fiction that pipes can be seeked (sought?) on. */
result = SMB_VFS_READ(fsp, fd, data, n);
fsp->fh->pos = 0;
}
#else /* HAVE_PREAD */
SMB_OFF_T curr;
int lerrno;
curr = SMB_VFS_LSEEK(fsp, fd, 0, SEEK_CUR);
if (curr == -1 && errno == ESPIPE) {
/* Maintain the fiction that pipes can be seeked (sought?) on. */
result = SMB_VFS_READ(fsp, fd, data, n);
fsp->fh->pos = 0;
return result;
}
if (SMB_VFS_LSEEK(fsp, fd, offset, SEEK_SET) == -1) {
return -1;
}
errno = 0;
result = SMB_VFS_READ(fsp, fd, data, n);
lerrno = errno;
SMB_VFS_LSEEK(fsp, fd, curr, SEEK_SET);
errno = lerrno;
#endif /* HAVE_PREAD */
return result;
}
ssize_t vfs_read_data(files_struct *fsp, char *buf, size_t byte_count)
{
size_t total=0;
while (total < byte_count)
{
ssize_t ret = SMB_VFS_READ(fsp, fsp->fh->fd, buf + total,
byte_count - total);
if (ret == 0) return total;
if (ret == -1) {
if (errno == EINTR)
continue;
else
return -1;
}
total += ret;
}
return (ssize_t)total;
}