terom@157: 
terom@157: #include "fifo.h"
terom@157: #include "transport_fd.h"
terom@118: 
terom@118: #include <stdlib.h>
terom@118: #include <sys/types.h>
terom@118: #include <sys/stat.h>
terom@118: #include <fcntl.h>
terom@118: #include <string.h>
terom@118: 
terom@157: /**
terom@157:  * Our transport_type
terom@157:  */
terom@157: extern const struct transport_type fifo_type;
terom@157: 
terom@157: /**
terom@157:  * The fifo state
terom@157:  */
terom@118: struct fifo {
terom@157:     /** The FD-based state */
terom@157:     struct transport_fd base_fd;
terom@118:     
terom@157:     /** Path to the fifo */
terom@118:     char *path;
terom@118: };
terom@118: 
terom@118: /**
terom@118:  * Get a sock_fd pointer from a sock_fifo pointer
terom@118:  */
terom@118: #define FIFO_FD(sock_ptr) (&(sock_ptr)->base_fd)
terom@118: 
terom@118: /**
terom@118:  * Get a sock_base pointer from a sock_fifo pointer
terom@118:  */
terom@157: #define FIFO_TRANSPORT(sock_ptr) TRANSPORT_FD_BASE(FIFO_FD(sock_ptr))
terom@118: 
terom@118: 
terom@118: /**
terom@118:  * (re)open the fifo, closing it if already open, and keeping any event callbacks registered.
terom@118:  */
terom@157: static err_t fifo_open (struct fifo *fifo, error_t *err)
terom@118: {
terom@157:     int _fd;
terom@118: 
terom@157:     // open(2) the path in non-blocking read-only mode
terom@157:     if ((_fd = open(fifo->path, O_RDONLY | O_NONBLOCK)) < 0)
terom@118:         RETURN_SET_ERROR_ERRNO(err, ERR_OPEN);
terom@118: 
terom@118:     // set the new fd
terom@157:     if ((ERROR_CODE(err) = transport_fd_set(FIFO_FD(fifo), _fd)))
terom@118:         return ERROR_CODE(err);
terom@118:     
terom@157:     // use default transport event-based behaviour
terom@157:     if ((ERROR_CODE(err) = transport_fd_defaults(FIFO_FD(fifo))))
terom@157:         return ERROR_CODE(err);
terom@157: 
terom@118:     // ok
terom@118:     return SUCCESS;
terom@118: }
terom@118: 
terom@118: /**
terom@118:  * Destroy the fifo, releasing all resources
terom@118:  */
terom@118: static void fifo_destroy (struct fifo *fifo)
terom@118: {
terom@157:     // destroy base
terom@157:     transport_fd_destroy(FIFO_FD(fifo));
terom@118: 
terom@118:     // release the path
terom@118:     free(fifo->path);
terom@118: }
terom@118: 
terom@118: /**
terom@118:  * sock_stream_methods::read implementation.
terom@118:  *
terom@118:  * Try and do a normal sock_fd_read call, but re-open with EAGAIN on EOF
terom@118:  */
terom@157: err_t fifo_read (transport_t *transport, void *buf, size_t *len, struct error_info *err)
terom@118: {
terom@157:     struct fifo *fifo = transport_check(transport, &fifo_type);
terom@118: 
terom@157:     // trap READ_EOF
terom@157:     if (transport_fd_methods_read(transport, buf, len, err) != ERR_EOF)
terom@118:         return ERROR_CODE(err);
terom@118:     
terom@118:     // re-open it
terom@118:     // XXX: re-add events?
terom@118:     if (fifo_open(fifo, err))
terom@118:         goto error;
terom@118: 
terom@118:     // ok, act as if it was EAGAIN
terom@118:     *len = 0;
terom@118: 
terom@118:     return SUCCESS;
terom@118: 
terom@118: error:
terom@118:     return ERROR_CODE(err);
terom@118: }
terom@118: 
terom@118: /**
terom@118:  * sock_stream_methods::release implementation
terom@118:  */
terom@157: static void _fifo_destroy (transport_t *transport)
terom@118: {
terom@157:     struct fifo *fifo = transport_check(transport, &fifo_type);
terom@118:     
terom@118:     fifo_destroy(fifo);
terom@118: }
terom@118: 
terom@118: /*
terom@118:  * Our sock_stream_type
terom@118:  */
terom@157: const struct transport_type fifo_type = {
terom@161:     .parent                 = &transport_fd_type,
terom@118:     .methods                = {
terom@157:         .read               = fifo_read,
terom@118:         .write              = NULL,
terom@157:         .events             = transport_fd_methods_events,
terom@157:         .destroy            = _fifo_destroy,
terom@118:     },
terom@118: };
terom@118: 
terom@157: err_t fifo_open_read (struct transport_info *transport_info, transport_t **transport_ptr, struct event_base *ev_base,
terom@157:         const char *path, error_t *err)
terom@118: {
terom@118:     struct fifo *fifo;
terom@118: 
terom@118:     // alloc
terom@118:     if ((fifo = calloc(1, sizeof(*fifo))) == NULL)
terom@118:         return SET_ERROR(err, ERR_CALLOC);
terom@118: 
terom@118:     // copy the path
terom@118:     if ((fifo->path = strdup(path)) == NULL)
terom@118:         return SET_ERROR(err, ERR_STRDUP);
terom@118: 
terom@118:     // init
terom@157:     transport_init(FIFO_TRANSPORT(fifo), &fifo_type, transport_info);
terom@157:     transport_fd_init(FIFO_FD(fifo), ev_base, TRANSPORT_FD_INVALID);
terom@157:     
terom@118:     // open the fifo
terom@118:     if (fifo_open(fifo, err))
terom@118:         goto error;
terom@118: 
terom@118:     // ok
terom@157:     *transport_ptr = FIFO_TRANSPORT(fifo);
terom@118: 
terom@118:     return SUCCESS;
terom@118: 
terom@118: error:
terom@118:     // cleanup
terom@118:     fifo_destroy(fifo);
terom@118: 
terom@118:     return ERROR_CODE(err);
terom@118: }