static int
program_filter_close(struct archive_read_filter *self)
{
struct program_filter *state;
int e;
state = (struct program_filter *)self->data;
e = child_stop(self, state);
/* Release our private data. */
free(state->out_buf);
free(state->description);
free(state);
return (e);
}
int
__archive_read_program(struct archive_read_filter *self, const char *cmd)
{
struct program_filter *state;
static const size_t out_buf_len = 65536;
char *out_buf;
const char *prefix = "Program: ";
pid_t child;
size_t l;
l = strlen(prefix) + strlen(cmd) + 1;
state = (struct program_filter *)calloc(1, sizeof(*state));
out_buf = (char *)malloc(out_buf_len);
if (state == NULL || out_buf == NULL ||
archive_string_ensure(&state->description, l) == NULL) {
archive_set_error(&self->archive->archive, ENOMEM,
"Can't allocate input data");
if (state != NULL) {
archive_string_free(&state->description);
free(state);
}
free(out_buf);
return (ARCHIVE_FATAL);
}
archive_strcpy(&state->description, prefix);
archive_strcat(&state->description, cmd);
self->code = ARCHIVE_FILTER_PROGRAM;
self->name = state->description.s;
state->out_buf = out_buf;
state->out_buf_len = out_buf_len;
child = __archive_create_child(cmd, &state->child_stdin,
&state->child_stdout);
if (child == -1) {
free(state->out_buf);
free(state);
archive_set_error(&self->archive->archive, EINVAL,
"Can't initialize filter; unable to run program \"%s\"",
cmd);
return (ARCHIVE_FATAL);
}
#if defined(_WIN32) && !defined(__CYGWIN__)
state->child = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, child);
if (state->child == NULL) {
child_stop(self, state);
free(state->out_buf);
free(state);
archive_set_error(&self->archive->archive, EINVAL,
"Can't initialize filter; unable to run program \"%s\"",
cmd);
return (ARCHIVE_FATAL);
}
#else
state->child = child;
#endif
self->data = state;
self->read = program_filter_read;
self->skip = NULL;
self->close = program_filter_close;
/* XXX Check that we can read at least one byte? */
return (ARCHIVE_OK);
}
/*
* Use select() to decide whether the child is ready for read or write.
*/
static ssize_t
child_read(struct archive_read_filter *self, char *buf, size_t buf_len)
{
struct program_filter *state = self->data;
ssize_t ret, requested, avail;
const char *p;
requested = buf_len > SSIZE_MAX ? SSIZE_MAX : buf_len;
for (;;) {
do {
ret = read(state->child_stdout, buf, requested);
} while (ret == -1 && errno == EINTR);
if (ret > 0)
return (ret);
if (ret == 0 || (ret == -1 && errno == EPIPE))
/* Child has closed its output; reap the child
* and return the status. */
return (child_stop(self, state));
if (ret == -1 && errno != EAGAIN)
return (-1);
if (state->child_stdin == -1) {
/* Block until child has some I/O ready. */
__archive_check_child(state->child_stdin,
state->child_stdout);
continue;
}
/* Get some more data from upstream. */
p = __archive_read_filter_ahead(self->upstream, 1, &avail);
if (p == NULL) {
close(state->child_stdin);
state->child_stdin = -1;
fcntl(state->child_stdout, F_SETFL, 0);
if (avail < 0)
return (avail);
continue;
}
do {
ret = write(state->child_stdin, p, avail);
} while (ret == -1 && errno == EINTR);
if (ret > 0) {
/* Consume whatever we managed to write. */
__archive_read_filter_consume(self->upstream, ret);
} else if (ret == -1 && errno == EAGAIN) {
/* Block until child has some I/O ready. */
__archive_check_child(state->child_stdin,
state->child_stdout);
} else {
/* Write failed. */
close(state->child_stdin);
state->child_stdin = -1;
fcntl(state->child_stdout, F_SETFL, 0);
/* If it was a bad error, we're done; otherwise
* it was EPIPE or EOF, and we can still read
* from the child. */
if (ret == -1 && errno != EPIPE)
return (-1);
}
}
}
/*
* Use select() to decide whether the child is ready for read or write.
*/
static ssize_t
child_read(struct archive_read_filter *self, char *buf, size_t buf_len)
{
struct program_filter *state = self->data;
ssize_t ret, requested, avail;
const char *p;
#if defined(_WIN32) && !defined(__CYGWIN__)
HANDLE handle = (HANDLE)_get_osfhandle(state->child_stdout);
#endif
requested = buf_len > SSIZE_MAX ? SSIZE_MAX : buf_len;
for (;;) {
do {
#if defined(_WIN32) && !defined(__CYGWIN__)
/* Avoid infinity wait.
* Note: If there is no data in the pipe, ReadFile()
* called in read() never returns and so we won't
* write remaining encoded data to the pipe.
* Note: This way may cause performance problem.
* we are looking forward to great code to resolve
* this. */
DWORD pipe_avail = -1;
int cnt = 2;
while (PeekNamedPipe(handle, NULL, 0, NULL,
&pipe_avail, NULL) != 0 && pipe_avail == 0 &&
cnt--)
Sleep(5);
if (pipe_avail == 0) {
ret = -1;
errno = EAGAIN;
break;
}
#endif
ret = read(state->child_stdout, buf, requested);
} while (ret == -1 && errno == EINTR);
if (ret > 0)
return (ret);
if (ret == 0 || (ret == -1 && errno == EPIPE))
/* Child has closed its output; reap the child
* and return the status. */
return (child_stop(self, state));
if (ret == -1 && errno != EAGAIN)
return (-1);
if (state->child_stdin == -1) {
/* Block until child has some I/O ready. */
__archive_check_child(state->child_stdin,
state->child_stdout);
continue;
}
/* Get some more data from upstream. */
p = __archive_read_filter_ahead(self->upstream, 1, &avail);
if (p == NULL) {
close(state->child_stdin);
state->child_stdin = -1;
fcntl(state->child_stdout, F_SETFL, 0);
if (avail < 0)
return (avail);
continue;
}
do {
ret = write(state->child_stdin, p, avail);
} while (ret == -1 && errno == EINTR);
if (ret > 0) {
/* Consume whatever we managed to write. */
__archive_read_filter_consume(self->upstream, ret);
} else if (ret == -1 && errno == EAGAIN) {
/* Block until child has some I/O ready. */
__archive_check_child(state->child_stdin,
state->child_stdout);
} else {
/* Write failed. */
close(state->child_stdin);
state->child_stdin = -1;
fcntl(state->child_stdout, F_SETFL, 0);
/* If it was a bad error, we're done; otherwise
* it was EPIPE or EOF, and we can still read
* from the child. */
if (ret == -1 && errno != EPIPE)
return (-1);
}
}
}
