void VerilatedVcd::bufferFlush () {
// We add output data to m_writep.
// When it gets nearly full we dump it using this routine which calls write()
// This is much faster than using buffered I/O
if (VL_UNLIKELY(!isOpen())) return;
char* wp = m_wrBufp;
while (1) {
ssize_t remaining = (m_writep - wp);
if (remaining==0) break;
errno = 0;
ssize_t got = write (m_fd, wp, remaining);
if (got>0) {
wp += got;
m_wroteBytes += got;
} else if (got < 0) {
if (errno != EAGAIN && errno != EINTR) {
// write failed, presume error (perhaps out of disk space)
string msg = (string)"VerilatedVcd::bufferFlush: "+strerror(errno);
vl_fatal("",0,"",msg.c_str());
closeErr();
break;
}
}
}
// Reset buffer
m_writep = m_wrBufp;
}
/* Normal read/lseek tests */
static void rdseek (void)
{
/* SEEK_DATA and SEEK_HOLE were added in 3.1 */
enum { SEEK_INVALID = 99999 }; /* Invalid value for whence for seek */
u8 buf[Local_option.block_size];
int fd;
s64 offset;
u64 size;
/* Read BigFile and verify contents */
fd = open(BigFile, O_RDWR, 0);
size = Local_option.size_big_file;
for (offset = 0; size; offset += Local_option.block_size) {
unint n = Local_option.block_size;
if (n > size) n = size;
read(fd, buf, n);
CheckFill(buf, n, offset);
size -= n;
}
/* Try reading passed eof */
readCheckSize(fd, buf, sizeof(buf), 0);
/* Start read before eof but go beyond eof */
offset = Local_option.size_big_file - 47;
lseek(fd, offset, SEEK_SET);
readCheckSize(fd, buf, Local_option.block_size, 47);
CheckFill(buf, 47, offset);
/* Seek to middle of file and verify contents */
offset = Local_option.size_big_file / 2;
lseek(fd, offset, SEEK_SET);
read(fd, buf, Local_option.block_size);
CheckFill(buf, Local_option.block_size, offset);
/* Seek from current position forward 2 blocks */
offset += 3 * Local_option.block_size;
lseekCheckOffset(fd, 2 * Local_option.block_size, SEEK_CUR, offset);
read(fd, buf, Local_option.block_size);
CheckFill(buf, Local_option.block_size, offset);
/* Seek from eof back 3 blocks */
offset = Local_option.size_big_file - 3 * Local_option.block_size;
lseekCheckOffset(fd, -(3 * Local_option.block_size), SEEK_END, offset);
read(fd, buf, Local_option.block_size);
CheckFill(buf, Local_option.block_size, offset);
/* Seek beyond eof */
offset = Local_option.size_big_file + Local_option.block_size;
lseek(fd, offset, SEEK_SET);
readCheckSize(fd, buf, Local_option.block_size, 0);
/* Seek bad whence */
lseekErr(EINVAL, fd, 0, SEEK_INVALID);
/* Seek negative offset */
lseekErr(EINVAL, fd, -3, SEEK_SET);
close(fd);
/* Seek on closed fd */
lseekErr(EBADF, fd, 0, SEEK_SET);
/* 2nd close is an error */
closeErr(EBADF, fd);
}
