1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_bsd_rtems |
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5 | * |
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6 | * @brief TODO. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009, 2010 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Obere Lagerstr. 30 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * Redistribution and use in source and binary forms, with or without |
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19 | * modification, are permitted provided that the following conditions |
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20 | * are met: |
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21 | * 1. Redistributions of source code must retain the above copyright |
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22 | * notice, this list of conditions and the following disclaimer. |
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23 | * 2. Redistributions in binary form must reproduce the above copyright |
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24 | * notice, this list of conditions and the following disclaimer in the |
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25 | * documentation and/or other materials provided with the distribution. |
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26 | * |
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27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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37 | * SUCH DAMAGE. |
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38 | */ |
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39 | |
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40 | #include <sys/types.h> //needed for fd_mask and such |
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41 | #include <machine/rtems-bsd-kernel-space.h> |
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42 | |
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43 | #include <sys/types.h> |
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44 | #include <sys/systm.h> |
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45 | #include <sys/selinfo.h> |
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46 | #include <sys/fcntl.h> |
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47 | #include <sys/socket.h> |
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48 | #include <sys/socketvar.h> |
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49 | #include <sys/protosw.h> |
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50 | #include <sys/select.h> |
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51 | #include <sys/kernel.h> |
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52 | #include <sys/lock.h> |
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53 | #include <sys/mutex.h> |
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54 | #include <sys/malloc.h> |
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55 | |
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56 | void selrecord(struct thread *selector, struct selinfo *sip) |
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57 | { |
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58 | BSD_PANIC("not implemented"); |
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59 | } |
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60 | |
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61 | void selwakeup(struct selinfo *sip) |
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62 | { |
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63 | BSD_PANIC("not implemented"); |
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64 | } |
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65 | |
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66 | void selwakeuppri(struct selinfo *sip, int pri) |
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67 | { |
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68 | BSD_PANIC("not implemented"); |
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69 | } |
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70 | |
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71 | void seltdfini(struct thread *td) |
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72 | { |
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73 | BSD_PANIC("not implemented"); |
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74 | } |
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75 | |
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76 | /* |
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77 | ********************************************************************* |
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78 | * RTEMS implementation of select() system call * |
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79 | ********************************************************************* |
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80 | */ |
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81 | |
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82 | /* |
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83 | * This implementation is quite restricted: |
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84 | * Works on sockets only -- no support for other devices! |
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85 | * A given socket can be in a read-select or a read/recv* by only |
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86 | * one task at a time. |
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87 | * A given socket can be in a write-select or a write/send* by only |
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88 | * one task at a time. |
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89 | * |
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90 | * NOTE - select() is a very expensive system call. It should be avoided |
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91 | * if at all possible. In many cases, rewriting the application |
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92 | * to use multiple tasks (one per socket) is a better solution. |
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93 | */ |
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94 | |
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95 | struct socket *rtems_bsdnet_fdToSocket(int fd); |
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96 | |
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97 | static int |
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98 | socket_select (struct socket *so, int which, rtems_id tid) |
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99 | { |
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100 | switch (which) { |
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101 | |
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102 | case FREAD: |
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103 | if (soreadable(so)) |
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104 | return (1); |
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105 | SOCK_LOCK(so); |
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106 | so->so_rcv.sb_flags |= SB_WAIT; |
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107 | so->so_rcv.sb_sel.si_pid = tid; |
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108 | SOCK_UNLOCK(so); |
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109 | break; |
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110 | |
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111 | case FWRITE: |
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112 | if (sowriteable(so)) |
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113 | return (1); |
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114 | SOCK_LOCK(so); |
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115 | so->so_snd.sb_flags |= SB_WAIT; |
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116 | so->so_snd.sb_sel.si_pid = tid; |
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117 | SOCK_UNLOCK(so); |
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118 | break; |
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119 | |
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120 | case 0: |
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121 | if (so->so_oobmark || (so->so_state & SBS_RCVATMARK)) |
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122 | return (1); |
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123 | SOCK_LOCK(so); |
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124 | so->so_rcv.sb_sel.si_pid = tid; |
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125 | SOCK_UNLOCK(so); |
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126 | break; |
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127 | } |
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128 | return (0); |
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129 | } |
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130 | |
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131 | static int |
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132 | selscan (rtems_id tid, fd_mask **ibits, fd_mask **obits, int nfd, int *retval) |
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133 | { |
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134 | struct socket *so; |
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135 | int msk, i, fd; |
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136 | fd_mask bits, bit; |
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137 | int n = 0; |
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138 | static int flag[3] = { FREAD, FWRITE, 0 }; |
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139 | |
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140 | for (msk = 0; msk < 3; msk++) { |
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141 | if (ibits[msk] == NULL) |
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142 | continue; |
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143 | for (i = 0; i < nfd; i += NFDBITS) { |
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144 | bits = ibits[msk][i/NFDBITS]; |
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145 | for (fd = i, bit = 1 ; bits && (fd < nfd) ; fd++, bit <<= 1) { |
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146 | if ((bits & bit) == 0) |
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147 | continue; |
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148 | bits &= ~bit; |
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149 | so = rtems_bsdnet_fdToSocket (fd); |
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150 | if (so == NULL) |
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151 | return (EBADF); |
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152 | if (socket_select (so, flag[msk], tid)) { |
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153 | obits[msk][fd/NFDBITS] |= |
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154 | (1 << (fd % NFDBITS)); |
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155 | n++; |
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156 | } |
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157 | } |
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158 | } |
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159 | } |
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160 | *retval = n; |
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161 | return (0); |
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162 | } |
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163 | |
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164 | int |
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165 | select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *tv) |
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166 | { |
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167 | fd_mask *ibits[3], *obits[3]; |
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168 | fd_set ob[3]; |
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169 | int error, timo; |
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170 | int retval = 0; |
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171 | rtems_id tid; |
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172 | rtems_interval then = 0, now; |
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173 | rtems_event_set events; |
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174 | |
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175 | if (nfds < 0) |
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176 | return (EINVAL); |
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177 | if (tv) { |
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178 | timo = tv->tv_sec * hz + tv->tv_usec / tick; |
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179 | if (timo == 0) |
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180 | timo = 1; |
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181 | then = rtems_clock_get_ticks_since_boot(); |
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182 | } |
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183 | else { |
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184 | timo = 0; |
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185 | } |
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186 | |
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187 | #define getbits(name,i) if (name) { \ |
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188 | ibits[i] = &name->fds_bits[0]; \ |
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189 | obits[i] = &ob[i].fds_bits[0]; \ |
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190 | FD_ZERO(&ob[i]); \ |
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191 | } \ |
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192 | else ibits[i] = NULL |
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193 | getbits (readfds, 0); |
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194 | getbits (writefds, 1); |
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195 | getbits (exceptfds, 2); |
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196 | #undef getbits |
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197 | |
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198 | //rtems_task_ident (RTEMS_SELF, 0, &tid); |
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199 | //rtems_event_receive (SBWAIT_EVENT, RTEMS_EVENT_ANY | RTEMS_NO_WAIT, RTEMS_NO_TIMEOUT, &events); |
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200 | for (;;) { |
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201 | error = selscan(tid, ibits, obits, nfds, &retval); |
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202 | if (error || retval) |
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203 | break; |
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204 | if (timo) { |
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205 | now = rtems_clock_get_ticks_since_boot(); |
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206 | timo -= now - then; |
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207 | if (timo <= 0) |
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208 | break; |
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209 | then = now; |
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210 | } |
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211 | //rtems_event_receive (SBWAIT_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, timo, &events); |
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212 | } |
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213 | |
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214 | #define putbits(name,i) if (name) *name = ob[i] |
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215 | putbits (readfds, 0); |
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216 | putbits (writefds, 1); |
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217 | putbits (exceptfds, 2); |
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218 | #undef putbits |
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219 | if (error) { |
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220 | errno = error; |
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221 | retval = -1; |
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222 | } |
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223 | return (retval); |
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224 | } |
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