compat/imsg.h

   1 /*      $OpenBSD: imsg.h,v 1.5 2019/01/20 02:50:03 bcook Exp $  */
   2
   3 /*
   4  * Copyright (c) 2006, 2007 Pierre-Yves Ritschard <pyr@openbsd.org>
   5  * Copyright (c) 2006, 2007, 2008 Reyk Floeter <reyk@openbsd.org>
   6  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
   7  *
   8  * Permission to use, copy, modify, and distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  */
  20
  21 #ifndef _IMSG_H_
  22 #define _IMSG_H_
  23
  24 #include <stdint.h>
  25
  26 #define IBUF_READ_SIZE          65535
  27 #define IMSG_HEADER_SIZE        sizeof(struct imsg_hdr)
  28 #define MAX_IMSGSIZE            16384
  29
  30 struct ibuf {
  31         TAILQ_ENTRY(ibuf)        entry;
  32         unsigned char           *buf;
  33         size_t                   size;
  34         size_t                   max;
  35         size_t                   wpos;
  36         size_t                   rpos;
  37         int                      fd;
  38 };
  39
  40 struct msgbuf {
  41         TAILQ_HEAD(, ibuf)       bufs;
  42         uint32_t                 queued;
  43         int                      fd;
  44 };
  45
  46 struct ibuf_read {
  47         unsigned char            buf[IBUF_READ_SIZE];
  48         unsigned char           *rptr;
  49         size_t                   wpos;
  50 };
  51
  52 struct imsg_fd {
  53         TAILQ_ENTRY(imsg_fd)    entry;
  54         int                     fd;
  55 };
  56
  57 struct imsgbuf {
  58         TAILQ_HEAD(, imsg_fd)    fds;
  59         struct ibuf_read         r;
  60         struct msgbuf            w;
  61         int                      fd;
  62         pid_t                    pid;
  63 };
  64
  65 #define IMSGF_HASFD     1
  66
  67 struct imsg_hdr {
  68         uint32_t         type;
  69         uint16_t         len;
  70         uint16_t         flags;
  71         uint32_t         peerid;
  72         uint32_t         pid;
  73 };
  74
  75 struct imsg {
  76         struct imsg_hdr  hdr;
  77         int              fd;
  78         void            *data;
  79 };
  80
  81
  82 /* buffer.c */
  83 struct ibuf     *ibuf_open(size_t);
  84 struct ibuf     *ibuf_dynamic(size_t, size_t);
  85 int              ibuf_add(struct ibuf *, const void *, size_t);
  86 void            *ibuf_reserve(struct ibuf *, size_t);
  87 void            *ibuf_seek(struct ibuf *, size_t, size_t);
  88 size_t           ibuf_size(struct ibuf *);
  89 size_t           ibuf_left(struct ibuf *);
  90 void             ibuf_close(struct msgbuf *, struct ibuf *);
  91 int              ibuf_write(struct msgbuf *);
  92 void             ibuf_free(struct ibuf *);
  93 void             msgbuf_init(struct msgbuf *);
  94 void             msgbuf_clear(struct msgbuf *);
  95 int              msgbuf_write(struct msgbuf *);
  96 void             msgbuf_drain(struct msgbuf *, size_t);
  97
  98 /* imsg.c */
  99 void     imsg_init(struct imsgbuf *, int);
 100 ssize_t  imsg_read(struct imsgbuf *);
 101 ssize_t  imsg_get(struct imsgbuf *, struct imsg *);
 102 int      imsg_compose(struct imsgbuf *, uint32_t, uint32_t, pid_t, int,
 103             const void *, uint16_t);
 104 int      imsg_composev(struct imsgbuf *, uint32_t, uint32_t,  pid_t, int,
 105             const struct iovec *, int);
 106 struct ibuf *imsg_create(struct imsgbuf *, uint32_t, uint32_t, pid_t, uint16_t);
 107 int      imsg_add(struct ibuf *, const void *, uint16_t);
 108 void     imsg_close(struct imsgbuf *, struct ibuf *);
 109 void     imsg_free(struct imsg *);
 110 int      imsg_flush(struct imsgbuf *);
 111 void     imsg_clear(struct imsgbuf *);
 112
 113 #endif