// unbounded_channels <= 0 means no, > 0 means yes
// -1 means advance.
void check_channel(char threadsafe, qio_chtype_t type, int64_t start, int64_t len, int64_t chunksz, qio_hint_t file_hints, qio_hint_t ch_hints, char unbounded_channels, char reopen)
{
qio_file_t* f;
qio_channel_t* writing;
qio_channel_t* reading;
int64_t offset;
int64_t usesz;
int64_t end = start + len;
int err;
unsigned char* chunk;
unsigned char* got_chunk;
int64_t k;
ssize_t amt_written;
ssize_t amt_read;
char* chhints;
char* fhints;
FILE* writefp = NULL;
FILE* readfp = NULL;
int memory;
int64_t ch_end = end;
char filename[128];
int fd = -1;
strcpy(filename,"/tmp/qio_testXXXXXX");
if( unbounded_channels > 0 ) ch_end = INT64_MAX;
ch_hints = (ch_hints & ~ QIO_CHTYPEMASK) | type;
memory = 0;
if( (file_hints & QIO_METHODMASK) == QIO_METHOD_MEMORY ||
(ch_hints & QIO_METHODMASK) == QIO_METHOD_MEMORY ) {
memory = 1;
}
if( memory ) {
file_hints = (file_hints & ~ QIO_METHODMASK ) | QIO_METHOD_MEMORY;
ch_hints = (ch_hints & ~ QIO_METHODMASK ) | QIO_METHOD_MEMORY;
}
if( memory && type == QIO_CH_ALWAYS_UNBUFFERED ) return;
if( memory && reopen ) return;
if( (ch_hints & QIO_METHODMASK) == QIO_METHOD_FREADFWRITE ) {
if( (file_hints & QIO_METHODMASK) != QIO_METHOD_FREADFWRITE ) return;
}
if( (ch_hints & QIO_METHODMASK) == QIO_METHOD_MMAP ) {
if( (file_hints & QIO_METHODMASK) != QIO_METHOD_MMAP ) return;
}
fhints = qio_hints_to_string(file_hints);
chhints = qio_hints_to_string(ch_hints);
printf("check_channel(threadsafe=%i, type=%i, start=%lli, len=%lli, chunksz=%lli, file_hints=%s, ch_hints=%s, unbounded=%i, reopen=%i)\n",
(int) threadsafe,
(int) type,
(long long int) start,
(long long int) len,
(long long int) chunksz,
fhints,
chhints,
(int) unbounded_channels,
(int) reopen );
free(fhints);
free(chhints);
chunk = malloc(chunksz);
got_chunk = malloc(chunksz);
assert(chunk);
assert(got_chunk);
if( memory ) {
err = qio_file_open_mem_ext(&f, NULL, QIO_FDFLAG_READABLE|QIO_FDFLAG_WRITEABLE|QIO_FDFLAG_SEEKABLE, file_hints, NULL);
assert(!err);
} else {
// Open a temporary file.
if( reopen ) {
fd = mkstemp(filename);
close(fd);
err = qio_file_open_access(&f, filename, "w", file_hints, NULL);
assert(!err);
} else {
err = qio_file_open_tmp(&f, file_hints, NULL);
assert(!err);
}
// Rewind the file
if (f->fp ) {
int got;
got = fseek(f->fp, start, SEEK_SET);
assert( got == 0 );
} else {
off_t off;
err = sys_lseek(f->fd, start, SEEK_SET, &off);
assert(!err);
}
}
// Create a "write to file" channel.
err = qio_channel_create(&writing, f, ch_hints, 0, 1, start, ch_end, NULL);
assert(!err);
// Write stuff to the file.
for( offset = start; offset < end; offset += usesz ) {
usesz = chunksz;
if( offset + usesz > end ) usesz = end - offset;
// Fill chunk.
fill_testdata(offset, usesz, chunk);
// Write chunk.
if( writefp ) {
amt_written = fwrite(chunk, 1, usesz, writefp);
} else {
err = qio_channel_write(threadsafe, writing, chunk, usesz, &amt_written);
assert(!err);
}
assert(amt_written == usesz);
}
// Attempt to write 1 more byte; we should get EEOF
// if we've restricted the range of the channel.
// Write chunk.
if( unbounded_channels > 0) {
// do nothing
} else {
if( writefp ) {
int got;
got = fflush(writefp);
assert(got == 0);
amt_written = fwrite(chunk, 1, 1, writefp);
// fwrite might buffer on its own.
if( amt_written != 0 ) {
got = fflush(writefp);
assert(got == EOF);
}
assert(errno == EEOF);
} else {
if( unbounded_channels < 0 ) {
int times = -unbounded_channels;
for( int z = 0; z < times; z++ ) {
err = qio_channel_advance(threadsafe, writing, 1);
assert( !err );
}
}
err = qio_channel_write(threadsafe, writing, chunk, 1, &amt_written);
assert(amt_written == 0);
assert( err == EEOF );
}
}
qio_channel_release(writing);
// Reopen the file if we're doing reopen
if( reopen ) {
// Close the file.
qio_file_release(f);
err = qio_file_open_access(&f, filename, "r", file_hints, NULL);
assert(!err);
}
// Check that the file is the right length.
if( !memory ) {
struct stat stats;
err = sys_fstat(f->fd, &stats);
assert(!err);
assert(stats.st_size == end);
}
// That was fun. Now start at the beginning of the file
// and read the data.
// Rewind the file
if( !memory ) {
off_t off;
sys_lseek(f->fd, start, SEEK_SET, &off);
assert(!err);
}
// Read the data.
//err = qio_channel_init_file(&reading, type, f, ch_hints, 1, 0, start, end);
err = qio_channel_create(&reading, f, ch_hints, 1, 0, start, ch_end, NULL);
assert(!err);
// Read stuff from the file.
for( offset = start; offset < end; offset += usesz ) {
usesz = chunksz;
if( offset + usesz > end ) usesz = end - offset;
// Fill chunk.
fill_testdata(offset, usesz, chunk);
memset(got_chunk, 0xff, usesz);
// Read chunk.
if( readfp ) {
amt_read = fread(got_chunk, 1, usesz, readfp);
} else {
err = qio_channel_read(threadsafe, reading, got_chunk, usesz, &amt_read);
assert( err == EEOF || err == 0);
}
assert(amt_read == usesz);
// Compare chunk.
for( k = 0; k < usesz; k++ ) {
assert(got_chunk[k] == chunk[k]);
}
}
if( readfp ) {
amt_read = fread(got_chunk, 1, 1, readfp);
assert( amt_read == 0 );
assert( feof(readfp) );
} else {
if( unbounded_channels < 0 ) {
int times = -unbounded_channels;
for( int z = 0; z < times; z++ ) {
err = qio_channel_advance(threadsafe, reading, 1);
assert( !err );
}
err = qio_channel_advance(threadsafe, reading, -unbounded_channels);
assert( !err );
}
err = qio_channel_read(threadsafe, reading, got_chunk, 1, &amt_read);
assert( err == EEOF );
}
qio_channel_release(reading);
//err = qio_channel_destroy(&reading);
// Close the file.
qio_file_release(f);
if( reopen ) {
unlink(filename);
}
free(chunk);
free(got_chunk);
}
void check_mark(char* writepattern, char* readpattern)
{
qio_file_t* f;
qio_channel_t* writing;
qio_channel_t* reading;
int64_t offset;
int32_t got;
err_t err;
int i;
err = qio_file_open_tmp(&f, 0, NULL);
assert(!err);
err = qio_channel_create(&writing, f, 0, 0, 1, 0, INT64_MAX, NULL);
assert(!err);
err = qio_channel_offset(true, writing, &offset);
assert(!err);
assert(offset == 0);
for( i = 0; writepattern[i]; i++ ) {
switch (writepattern[i]) {
case 'M':
err = qio_channel_mark(true, writing);
break;
case 'R':
err = qio_channel_revert(true, writing);
break;
case 'C':
err = qio_channel_commit(true, writing);
break;
case 'A':
err = qio_channel_advance(true, writing, 1);
break;
default:
err = qio_channel_write_byte(true, writing, writepattern[i]);
}
assert(!err);
}
qio_channel_release(writing);
// Read the data a byte at a time.
err = qio_channel_create(&reading, f, 0, 1, 0, 0, INT64_MAX, NULL);
assert(!err);
for( i = 0; readpattern[i]; i++ ) {
switch (readpattern[i]) {
case 'M':
err = qio_channel_mark(true, reading);
break;
case 'R':
err = qio_channel_revert(true, reading);
break;
case 'C':
err = qio_channel_commit(true, reading);
break;
case 'A':
err = qio_channel_advance(true, reading, 1);
break;
default:
got = qio_channel_read_byte(true, reading);
if( got >= 0 ) assert(got == readpattern[i]);
else err = -got;
}
assert(!err);
}
got = qio_channel_read_byte(true, reading);
assert( got == - EEOF );
qio_channel_release(reading);
// Close the file.
qio_file_release(f);
}
// commit input, sending any data to the subprocess.
// once input is sent, close input channel and file.
// While sending that data, read output and error channels,
// buffering up the read data.
// once output/error reads EOF, close output/error file (not channel
// since output channel has the buffered data).
qioerr qio_proc_communicate(
const int threadsafe,
qio_channel_t* input,
qio_channel_t* output,
qio_channel_t* error) {
qioerr err = 0;
int rc = 0;
bool do_input;
bool do_output;
bool do_error;
bool input_ready;
bool output_ready;
bool error_ready;
fd_set rfds, wfds, efds;
int nfds = 1;
int input_fd = -1;
int output_fd = -1;
int error_fd = -1;
if( threadsafe ) {
// lock all three channels.
// but unlock them immediately and set them to NULL
// if they are already closed.
if( input ) {
err = qio_lock(&input->lock);
if( err ) return err;
if( qio_channel_isclosed(false, input) ) {
qio_unlock(&input->lock);
input = NULL;
}
}
if( output ) {
err = qio_lock(&output->lock);
if( err ) {
if( input ) qio_unlock(&input->lock);
return err;
}
if( qio_channel_isclosed(false, output) ) {
qio_unlock(&output->lock);
output = NULL;
}
}
if( error ) {
err = qio_lock(&error->lock);
if( err ) {
if( input ) qio_unlock(&input->lock);
if( output ) qio_unlock(&output->lock);
return err;
}
if( qio_channel_isclosed(false, error) ) {
qio_unlock(&error->lock);
error = NULL;
}
}
}
if( input ) {
input_fd = input->file->fd;
if( nfds <= input_fd ) nfds = input_fd + 1;
}
if( output ) {
output_fd = output->file->fd;
if( nfds <= output_fd ) nfds = output_fd + 1;
}
if( error ) {
error_fd = error->file->fd;
if( nfds <= error_fd ) nfds = error_fd + 1;
}
// Adjust all three pipes to be non-blocking.
if( input_fd != -1 ) {
rc = fcntl(input_fd, F_SETFL, O_NONBLOCK);
if( rc == -1 ) {
err = qio_int_to_err(errno);
}
}
if( output_fd != -1 ) {
rc = fcntl(output_fd, F_SETFL, O_NONBLOCK);
if( rc == -1 ) {
err = qio_int_to_err(errno);
}
}
if( error_fd != -1 ) {
rc = fcntl(error_fd, F_SETFL, O_NONBLOCK);
if( rc == -1 ) {
err = qio_int_to_err(errno);
}
}
// mark the output and error channels so that we
// can just keep advancing to read while buffering
// up all data. Before returning, we'll revert them
// so that this buffered data can be read again and
// update end_pos so that the channel knows not to
// call read again. Then, we can close the file
// descriptor.
if( output ) {
qio_channel_mark(false, output);
}
if( error ) {
qio_channel_mark(false, error);
}
do_input = (input != NULL);
do_output = (output != NULL);
do_error = (error != NULL);
while( do_input || do_output || do_error ) {
// Now call select to wait for one of the descriptors to
// become ready.
FD_ZERO(&rfds);
FD_ZERO(&wfds);
FD_ZERO(&efds);
if( do_input && input_fd != -1 ) {
FD_SET(input_fd, &wfds);
FD_SET(input_fd, &efds);
}
if( do_output && output_fd != -1 ) {
FD_SET(output_fd, &rfds);
FD_SET(output_fd, &efds);
}
if( do_error && error_fd != -1 ) {
FD_SET(error_fd, &rfds);
FD_SET(error_fd, &efds);
}
input_ready = false;
output_ready = false;
error_ready = false;
// Run select to wait for something
if( do_input || do_output || do_error ) {
// TODO -- use sys_select so threading can interact
struct timeval t;
t.tv_sec = 0;
t.tv_usec = 10;
rc = select(nfds, &rfds, &wfds, &efds, &t);
if (rc > 0) {
// read ready file descriptors
input_ready = input_fd != -1 && FD_ISSET(input_fd, &wfds);
output_ready = output_fd != -1 && FD_ISSET(output_fd, &rfds);
error_ready = error_fd != -1 && FD_ISSET(error_fd, &rfds);
}
// Ignore EAGAIN and EINTR
if (rc == EAGAIN || rc == EINTR) rc = 0;
}
if( rc == -1 ) {
err = qio_int_to_err(errno);
break;
}
if( do_input && input_ready ) {
err = _qio_channel_flush_qio_unlocked(input);
if( !err ) {
do_input = false;
// Close input channel.
err = qio_channel_close(false, input);
}
if( qio_err_to_int(err) == EAGAIN ) err = 0;
if( err ) break;
}
if( do_output && output_ready ) {
// read some into our buffer.
err = qio_channel_advance(false, output, qbytes_iobuf_size);
if( qio_err_to_int(err) == EEOF ) {
qio_file_t* output_file = qio_channel_get_file(output);
do_output = false;
// close the output file (not channel), in case closing output
// causes the program to output on stderr, e.g.
if( output_file )
err = qio_file_close(output_file);
// Set the output channel maximum position
// This prevents a read on output from trying to get
// more data from the (now closed) file.
output->end_pos = qio_channel_offset_unlocked(output);
}
if( qio_err_to_int(err) == EAGAIN ) err = 0;
if( err ) break;
}
if( do_error && error_ready ) {
// read some into our buffer.
err = qio_channel_advance(false, error, qbytes_iobuf_size);
if( qio_err_to_int(err) == EEOF ) {
qio_file_t* error_file = qio_channel_get_file(error);
do_error = false;
// close the error file (not channel)
if( error_file )
err = qio_file_close(error_file);
// Set the error channel maximum position
error->end_pos = qio_channel_offset_unlocked(error);
}
if( qio_err_to_int(err) == EAGAIN ) err = 0;
if( err ) break;
}
chpl_task_yield();
}
// we could close the file descriptors at this point,
// but we don't because we don't want to modify
// the file descriptor of the file since it's
// constant (and not protected by file's lock).
// The pipes will be closed when the channels are destroyed.
// We marked the output and error channels so that we
// can just keep advancing to read while buffering
// up all data. Before returning, we'll revert them
// so that this buffered data can be read again and
// update end_pos so that the channel knows not to
// call read again. Then, we can close the file
// descriptor.
// revert the output and error channels
if( output) qio_channel_revert_unlocked(output);
if( error ) qio_channel_revert_unlocked(error);
if( threadsafe ) {
// unlock all three channels.
if( error ) qio_unlock(&error->lock);
if( output ) qio_unlock(&output->lock);
if( input ) qio_unlock(&input->lock);
}
return err;
}