1 /* $OpenBSD: mio_rmidi.c,v 1.23 2015/12/20 11:29:29 ratchov 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 #define DEVPATH_PREFIX "/dev/rmidi" 34 #define DEVPATH_MAX (1 + \ 35 sizeof(DEVPATH_PREFIX) - 1 + \ 36 sizeof(int) * 3) 37 38 struct mio_rmidi_hdl { 39 struct mio_hdl mio; 40 int fd; 41 }; 42 43 static void mio_rmidi_close(struct mio_hdl *); 44 static size_t mio_rmidi_read(struct mio_hdl *, void *, size_t); 45 static size_t mio_rmidi_write(struct mio_hdl *, const void *, size_t); 46 static int mio_rmidi_nfds(struct mio_hdl *); 47 static int mio_rmidi_pollfd(struct mio_hdl *, struct pollfd *, int); 48 static int mio_rmidi_revents(struct mio_hdl *, struct pollfd *); 49 50 static struct mio_ops mio_rmidi_ops = { 51 mio_rmidi_close, 52 mio_rmidi_write, 53 mio_rmidi_read, 54 mio_rmidi_nfds, 55 mio_rmidi_pollfd, 56 mio_rmidi_revents 57 }; 58 59 int 60 mio_rmidi_getfd(const char *str, unsigned int mode, int nbio) 61 { 62 const char *p; 63 char path[DEVPATH_MAX]; 64 unsigned int devnum; 65 int fd, flags; 66 67 #ifdef DEBUG 68 _sndio_debug_init(); 69 #endif 70 p = _sndio_parsetype(str, "rmidi"); 71 if (p == NULL) { 72 DPRINTF("mio_rmidi_getfd: %s: \"rsnd\" expected\n", str); 73 return -1; 74 } 75 switch (*p) { 76 case '/': 77 p++; 78 break; 79 default: 80 DPRINTF("mio_rmidi_getfd: %s: '/' expected\n", str); 81 return -1; 82 } 83 p = _sndio_parsenum(p, &devnum, 255); 84 if (p == NULL || *p != '\0') { 85 DPRINTF("mio_rmidi_getfd: %s: number expected after '/'\n", str); 86 return -1; 87 } 88 snprintf(path, sizeof(path), DEVPATH_PREFIX "%u", devnum); 89 if (mode == (MIO_IN | MIO_OUT)) 90 flags = O_RDWR; 91 else 92 flags = (mode & MIO_OUT) ? O_WRONLY : O_RDONLY; 93 while ((fd = open(path, flags | O_NONBLOCK | O_CLOEXEC)) < 0) { 94 if (errno == EINTR) 95 continue; 96 DPERROR(path); 97 return -1; 98 } 99 return fd; 100 } 101 102 struct mio_hdl * 103 mio_rmidi_fdopen(int fd, unsigned int mode, int nbio) 104 { 105 struct mio_rmidi_hdl *hdl; 106 107 #ifdef DEBUG 108 _sndio_debug_init(); 109 #endif 110 hdl = malloc(sizeof(struct mio_rmidi_hdl)); 111 if (hdl == NULL) 112 return NULL; 113 _mio_create(&hdl->mio, &mio_rmidi_ops, mode, nbio); 114 hdl->fd = fd; 115 return (struct mio_hdl *)hdl; 116 } 117 118 struct mio_hdl * 119 _mio_rmidi_open(const char *str, unsigned int mode, int nbio) 120 { 121 struct mio_hdl *hdl; 122 int fd; 123 124 fd = mio_rmidi_getfd(str, mode, nbio); 125 if (fd < 0) 126 return NULL; 127 hdl = mio_rmidi_fdopen(fd, mode, nbio); 128 if (hdl != NULL) 129 return hdl; 130 while (close(fd) < 0 && errno == EINTR) 131 ; /* retry */ 132 return NULL; 133 } 134 135 static void 136 mio_rmidi_close(struct mio_hdl *sh) 137 { 138 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 139 int rc; 140 141 do { 142 rc = close(hdl->fd); 143 } while (rc < 0 && errno == EINTR); 144 free(hdl); 145 } 146 147 static size_t 148 mio_rmidi_read(struct mio_hdl *sh, void *buf, size_t len) 149 { 150 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 151 ssize_t n; 152 153 while ((n = read(hdl->fd, buf, len)) < 0) { 154 if (errno == EINTR) 155 continue; 156 if (errno != EAGAIN) { 157 DPERROR("mio_rmidi_read: read"); 158 hdl->mio.eof = 1; 159 } 160 return 0; 161 } 162 if (n == 0) { 163 DPRINTF("mio_rmidi_read: eof\n"); 164 hdl->mio.eof = 1; 165 return 0; 166 } 167 return n; 168 } 169 170 static size_t 171 mio_rmidi_write(struct mio_hdl *sh, const void *buf, size_t len) 172 { 173 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 174 ssize_t n; 175 176 while ((n = write(hdl->fd, buf, len)) < 0) { 177 if (errno == EINTR) 178 continue; 179 if (errno != EAGAIN) { 180 DPERROR("mio_rmidi_write: write"); 181 hdl->mio.eof = 1; 182 } 183 return 0; 184 } 185 return n; 186 } 187 188 static int 189 mio_rmidi_nfds(struct mio_hdl *sh) 190 { 191 return 1; 192 } 193 194 static int 195 mio_rmidi_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events) 196 { 197 struct mio_rmidi_hdl *hdl = (struct mio_rmidi_hdl *)sh; 198 199 pfd->fd = hdl->fd; 200 pfd->events = events; 201 return 1; 202 } 203 204 static int 205 mio_rmidi_revents(struct mio_hdl *sh, struct pollfd *pfd) 206 { 207 return pfd->revents; 208 } 209