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/* Copyright (c) 2014-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "fdpass.h"
#include "istream-file-private.h"
#include "istream-unix.h"
struct unix_istream {
struct file_istream fstream;
bool next_read_fd;
int read_fd;
};
static void
i_stream_unix_close(struct iostream_private *stream, bool close_parent)
{
struct unix_istream *ustream =
container_of(stream, struct unix_istream,
fstream.istream.iostream);
i_close_fd(&ustream->read_fd);
i_stream_file_close(stream, close_parent);
}
static ssize_t i_stream_unix_read(struct istream_private *stream)
{
struct unix_istream *ustream =
container_of(stream, struct unix_istream, fstream.istream);
size_t size;
ssize_t ret;
if (!ustream->next_read_fd)
return i_stream_file_read(stream);
i_assert(ustream->read_fd == -1);
i_assert(ustream->fstream.skip_left == 0); /* not supported here.. */
if (!i_stream_try_alloc(stream, 1, &size))
return -2;
ret = fd_read(stream->fd, stream->w_buffer + stream->pos, size,
&ustream->read_fd);
if (ustream->read_fd != -1)
ustream->next_read_fd = FALSE;
if (ret == 0) {
/* EOF */
stream->istream.eof = TRUE;
ustream->fstream.seen_eof = TRUE;
return -1;
}
if (unlikely(ret < 0)) {
if ((errno == EINTR || errno == EAGAIN) &&
!stream->istream.blocking) {
return 0;
} else {
i_assert(errno != 0);
/* if we get EBADF for a valid fd, it means something's
really wrong and we'd better just crash. */
i_assert(errno != EBADF);
stream->istream.stream_errno = errno;
return -1;
}
}
stream->pos += ret;
return ret;
}
struct istream *i_stream_create_unix(int fd, size_t max_buffer_size)
{
struct unix_istream *ustream;
struct istream *input;
i_assert(fd != -1);
ustream = i_new(struct unix_istream, 1);
ustream->read_fd = -1;
input = i_stream_create_file_common(&ustream->fstream, fd, NULL,
max_buffer_size, FALSE);
input->real_stream->iostream.close = i_stream_unix_close;
input->real_stream->read = i_stream_unix_read;
return input;
}
void i_stream_unix_set_read_fd(struct istream *input)
{
struct unix_istream *ustream =
container_of(input->real_stream, struct unix_istream,
fstream.istream);
ustream->next_read_fd = TRUE;
}
void i_stream_unix_unset_read_fd(struct istream *input)
{
struct unix_istream *ustream =
container_of(input->real_stream, struct unix_istream,
fstream.istream);
ustream->next_read_fd = FALSE;
}
int i_stream_unix_get_read_fd(struct istream *input)
{
struct unix_istream *ustream =
container_of(input->real_stream, struct unix_istream,
fstream.istream);
int fd;
fd = ustream->read_fd;
ustream->read_fd = -1;
return fd;
}
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