code.delx.au - pulseaudio/blob - src/pulsecore/iochannel.h

   1 #ifndef fooiochannelhfoo
   2 #define fooiochannelhfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   9
  10   PulseAudio is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU Lesser General Public License as
  12   published by the Free Software Foundation; either version 2.1 of the
  13   License, or (at your option) any later version.
  14
  15   PulseAudio is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public
  21   License along with PulseAudio; if not, write to the Free Software
  22   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  23   USA.
  24 ***/
  25
  26 #ifndef PACKAGE
  27 #error "Please include config.h before including this file!"
  28 #endif
  29
  30 #include <sys/types.h>
  31
  32 #include <pulse/mainloop-api.h>
  33 #include <pulsecore/creds.h>
  34 #include <pulsecore/macro.h>
  35
  36 /* A wrapper around UNIX file descriptors for attaching them to the a
  37    main event loop. Every time new data may be read or be written to
  38    the channel a callback function is called. It is safe to destroy
  39    the calling iochannel object from the callback */
  40
  41 typedef struct pa_iochannel pa_iochannel;
  42
  43 /* Create a new IO channel for the specified file descriptors for
  44 input resp. output. It is safe to pass the same file descriptor for
  45 both parameters (in case of full-duplex channels). For a simplex
  46 channel specify -1 for the other direction. */
  47
  48 pa_iochannel* pa_iochannel_new(pa_mainloop_api*m, int ifd, int ofd);
  49 void pa_iochannel_free(pa_iochannel*io);
  50
  51 /* Returns: length written on success, 0 if a retry is needed, negative value
  52  * on error. */
  53 ssize_t pa_iochannel_write(pa_iochannel*io, const void*data, size_t l);
  54 ssize_t pa_iochannel_read(pa_iochannel*io, void*data, size_t l);
  55
  56 #ifdef HAVE_CREDS
  57 bool pa_iochannel_creds_supported(pa_iochannel *io);
  58 int pa_iochannel_creds_enable(pa_iochannel *io);
  59
  60 ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l, const pa_creds *ucred);
  61 ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, pa_creds *ucred, bool *creds_valid);
  62 #endif
  63
  64 bool pa_iochannel_is_readable(pa_iochannel*io);
  65 bool pa_iochannel_is_writable(pa_iochannel*io);
  66 bool pa_iochannel_is_hungup(pa_iochannel*io);
  67
  68 /* Don't close the file descriptors when the io channel is freed. By
  69  * default the file descriptors are closed. */
  70 void pa_iochannel_set_noclose(pa_iochannel*io, bool b);
  71
  72 /* Set the callback function that is called whenever data becomes available for read or write */
  73 typedef void (*pa_iochannel_cb_t)(pa_iochannel*io, void *userdata);
  74 void pa_iochannel_set_callback(pa_iochannel*io, pa_iochannel_cb_t callback, void *userdata);
  75
  76 /* In case the file descriptor is a socket, return a pretty-printed string in *s which describes the peer connected */
  77 void pa_iochannel_socket_peer_to_string(pa_iochannel*io, char*s, size_t l);
  78
  79 /* Use setsockopt() to tune the receive and send buffers of TCP sockets */
  80 int pa_iochannel_socket_set_rcvbuf(pa_iochannel*io, size_t l);
  81 int pa_iochannel_socket_set_sndbuf(pa_iochannel*io, size_t l);
  82
  83 bool pa_iochannel_socket_is_local(pa_iochannel *io);
  84
  85 pa_mainloop_api* pa_iochannel_get_mainloop_api(pa_iochannel *io);
  86
  87 int pa_iochannel_get_recv_fd(pa_iochannel *io);
  88 int pa_iochannel_get_send_fd(pa_iochannel *io);
  89
  90 #endif