1 /* $OpenBSD: mio_rmidi.c,v 1.14 2014/08/15 03:51:40 guenther Exp $ */ 2 /* 3 * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <limits.h> 24 #include <poll.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #include "debug.h" 31 #include "mio_priv.h" 32 33 struct mio_rmidi_hdl { 34 struct mio_hdl mio; 35 int fd; 36 }; 37 38 static void mio_rmidi_close(struct mio_hdl *); 39 static size_t mio_rmidi_read(struct mio_hdl *, void *, size_t); 40 static size_t mio_rmidi_write(struct mio_hdl *, const void *, size_t); 41 static int mio_rmidi_nfds(struct mio_hdl *); 42 static int mio_rmidi_pollfd(struct mio_hdl *, struct pollfd *, int); 43 static int mio_rmidi_revents(struct mio_hdl *, struct pollfd *); 44 45 static struct mio_ops mio_rmidi_ops = { 46 mio_rmidi_close, 47 mio_rmidi_write, 48 mio_rmidi_read, 49 mio_rmidi_nfds, 50 mio_rmidi_pollfd, 51 mio_rmidi_revents 52 }; 53 54 struct mio_hdl * 55 _mio_rmidi_open(const char *str, unsigned int mode, int nbio) 56 { 57 int fd, flags; 58 struct mio_rmidi_hdl *hdl; 59 char path[PATH_MAX]; 60 61 switch (*str) { 62 case '/': 63 case ':': /* XXX: for backward compat */ 64 str++; 65 break; 66 default: 67 DPRINTF("_sio_sun_open: %s: '/<devnum>' expected\n", str); 68 return NULL; 69 } 70 hdl = malloc(sizeof(struct mio_rmidi_hdl)); 71 if (hdl == NULL) 72 return NULL; 73 _mio_create(&hdl->mio, &mio_rmidi_ops, mode, nbio); 74 75 snprintf(path, sizeof(path), "/dev/rmidi%s", str); 76 if (mode == (MIO_OUT | MIO_IN)) 77 flags = O_RDWR; 78 else 79 flags = (mode & MIO_OUT) ? O_WRONLY : O_RDONLY; 80 while ((fd = open(path, flags | O_NONBLOCK | O_CLOEXEC)) < 0) { 81 if (errno == EINTR) 82 continue; 83 DPERROR(path); 84 goto bad_free; 85 } 86 hdl->fd = fd; 87 return (struct mio_hdl *)hdl; 88 bad_free: 89 free(hdl); 90 return NULL; 91 } 92 93 static void 94 mio_rmidi_close(struct mio_hdl *sh) 95 { 96 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 97 int rc; 98 99 do { 100 rc = close(hdl->fd); 101 } while (rc < 0 && errno == EINTR); 102 free(hdl); 103 } 104 105 static size_t 106 mio_rmidi_read(struct mio_hdl *sh, void *buf, size_t len) 107 { 108 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 109 ssize_t n; 110 111 while ((n = read(hdl->fd, buf, len)) < 0) { 112 if (errno == EINTR) 113 continue; 114 if (errno != EAGAIN) { 115 DPERROR("mio_rmidi_read: read"); 116 hdl->mio.eof = 1; 117 } 118 return 0; 119 } 120 if (n == 0) { 121 DPRINTF("mio_rmidi_read: eof\n"); 122 hdl->mio.eof = 1; 123 return 0; 124 } 125 return n; 126 } 127 128 static size_t 129 mio_rmidi_write(struct mio_hdl *sh, const void *buf, size_t len) 130 { 131 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 132 ssize_t n; 133 134 while ((n = write(hdl->fd, buf, len)) < 0) { 135 if (errno == EINTR) 136 continue; 137 if (errno != EAGAIN) { 138 DPERROR("mio_rmidi_write: write"); 139 hdl->mio.eof = 1; 140 } 141 return 0; 142 } 143 return n; 144 } 145 146 static int 147 mio_rmidi_nfds(struct mio_hdl *sh) 148 { 149 return 1; 150 } 151 152 static int 153 mio_rmidi_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events) 154 { 155 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 156 157 pfd->fd = hdl->fd; 158 pfd->events = events; 159 return 1; 160 } 161 162 static int 163 mio_rmidi_revents(struct mio_hdl *sh, struct pollfd *pfd) 164 { 165 return pfd->revents; 166 } 167