1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX 1003.1b 6.5.2 - File Control |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <stdarg.h> |
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22 | #include <unistd.h> |
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23 | #include <fcntl.h> |
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24 | |
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25 | #include <rtems/libio_.h> |
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26 | |
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27 | static int duplicate_iop( rtems_libio_t *iop ) |
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28 | { |
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29 | int rv = 0; |
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30 | |
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31 | rtems_libio_t *diop = rtems_libio_allocate(); |
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32 | |
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33 | if (diop != NULL) { |
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34 | int oflag = rtems_libio_to_fcntl_flags( iop->flags ); |
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35 | |
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36 | oflag &= ~O_CREAT; |
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37 | diop->flags |= rtems_libio_fcntl_flags( oflag ); |
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38 | |
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39 | rtems_filesystem_instance_lock( &iop->pathinfo ); |
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40 | rtems_filesystem_location_clone( &diop->pathinfo, &iop->pathinfo ); |
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41 | rtems_filesystem_instance_unlock( &iop->pathinfo ); |
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42 | |
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43 | /* |
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44 | * XXX: We call the open handler here to have a proper open and close pair. |
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45 | * |
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46 | * FIXME: What to do with the path? |
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47 | */ |
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48 | rv = (*diop->pathinfo.handlers->open_h)( diop, NULL, oflag, 0 ); |
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49 | if ( rv == 0 ) { |
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50 | rv = diop - rtems_libio_iops; |
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51 | } else { |
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52 | rtems_libio_free( diop ); |
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53 | } |
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54 | } else { |
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55 | rv = -1; |
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56 | } |
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57 | |
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58 | return rv; |
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59 | } |
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60 | |
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61 | static int duplicate2_iop( rtems_libio_t *iop, int fd2 ) |
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62 | { |
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63 | rtems_libio_t *iop2; |
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64 | int rv = 0; |
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65 | |
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66 | rtems_libio_check_fd( fd2 ); |
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67 | iop2 = rtems_libio_iop( fd2 ); |
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68 | |
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69 | if (iop != iop2) |
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70 | { |
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71 | int oflag; |
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72 | |
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73 | if ((iop2->flags & LIBIO_FLAGS_OPEN) != 0) { |
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74 | rv = (*iop2->pathinfo.handlers->close_h)( iop2 ); |
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75 | } |
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76 | |
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77 | if (rv == 0) { |
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78 | oflag = rtems_libio_to_fcntl_flags( iop->flags ); |
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79 | oflag &= ~O_CREAT; |
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80 | iop2->flags |= rtems_libio_fcntl_flags( oflag ); |
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81 | |
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82 | rtems_filesystem_instance_lock( &iop->pathinfo ); |
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83 | rtems_filesystem_location_clone( &iop2->pathinfo, &iop->pathinfo ); |
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84 | rtems_filesystem_instance_unlock( &iop->pathinfo ); |
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85 | |
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86 | /* |
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87 | * XXX: We call the open handler here to have a proper open and close |
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88 | * pair. |
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89 | * |
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90 | * FIXME: What to do with the path? |
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91 | */ |
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92 | rv = (*iop2->pathinfo.handlers->open_h)( iop2, NULL, oflag, 0 ); |
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93 | if ( rv == 0 ) { |
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94 | rv = fd2; |
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95 | } |
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96 | } |
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97 | } |
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98 | |
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99 | return rv; |
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100 | } |
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101 | |
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102 | static int vfcntl( |
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103 | int fd, |
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104 | int cmd, |
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105 | va_list ap |
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106 | ) |
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107 | { |
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108 | rtems_libio_t *iop; |
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109 | int fd2; |
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110 | int flags; |
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111 | int mask; |
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112 | int ret = 0; |
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113 | |
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114 | rtems_libio_check_fd( fd ); |
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115 | iop = rtems_libio_iop( fd ); |
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116 | rtems_libio_check_is_open(iop); |
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117 | |
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118 | /* |
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119 | * Now process the fcntl(). |
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120 | */ |
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121 | |
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122 | /* |
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123 | * This switch should contain all the cases from POSIX. |
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124 | */ |
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125 | |
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126 | switch ( cmd ) { |
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127 | case F_DUPFD: /* dup */ |
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128 | ret = duplicate_iop( iop ); |
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129 | break; |
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130 | |
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131 | case F_DUP2FD: /* dup2 */ |
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132 | fd2 = va_arg( ap, int ); |
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133 | ret = duplicate2_iop( iop, fd2 ); |
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134 | break; |
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135 | |
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136 | case F_GETFD: /* get f_flags */ |
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137 | ret = ((iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC) != 0); |
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138 | break; |
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139 | |
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140 | case F_SETFD: /* set f_flags */ |
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141 | /* |
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142 | * Interpret the third argument as the "close on exec()" flag. |
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143 | * If this argument is 1, then the file descriptor is to be closed |
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144 | * if a new process is exec()'ed. Since RTEMS does not support |
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145 | * processes, then we can ignore this one except to make |
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146 | * F_GETFD work. |
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147 | */ |
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148 | |
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149 | if ( va_arg( ap, int ) ) |
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150 | iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC; |
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151 | else |
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152 | iop->flags &= ~LIBIO_FLAGS_CLOSE_ON_EXEC; |
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153 | break; |
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154 | |
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155 | case F_GETFL: /* more flags (cloexec) */ |
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156 | ret = rtems_libio_to_fcntl_flags( iop->flags ); |
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157 | break; |
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158 | |
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159 | case F_SETFL: |
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160 | flags = rtems_libio_fcntl_flags( va_arg( ap, int ) ); |
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161 | mask = LIBIO_FLAGS_NO_DELAY | LIBIO_FLAGS_APPEND; |
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162 | |
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163 | /* |
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164 | * XXX If we are turning on append, should we seek to the end? |
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165 | */ |
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166 | |
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167 | iop->flags = (iop->flags & ~mask) | (flags & mask); |
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168 | break; |
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169 | |
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170 | case F_GETLK: |
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171 | errno = ENOTSUP; |
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172 | ret = -1; |
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173 | break; |
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174 | |
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175 | case F_SETLK: |
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176 | errno = ENOTSUP; |
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177 | ret = -1; |
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178 | break; |
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179 | |
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180 | case F_SETLKW: |
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181 | errno = ENOTSUP; |
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182 | ret = -1; |
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183 | break; |
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184 | |
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185 | case F_SETOWN: /* for sockets. */ |
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186 | errno = ENOTSUP; |
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187 | ret = -1; |
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188 | break; |
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189 | |
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190 | case F_GETOWN: /* for sockets. */ |
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191 | errno = ENOTSUP; |
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192 | ret = -1; |
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193 | break; |
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194 | |
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195 | default: |
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196 | errno = EINVAL; |
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197 | ret = -1; |
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198 | break; |
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199 | } |
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200 | |
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201 | /* |
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202 | * If we got this far successfully, then we give the optional |
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203 | * filesystem specific handler a chance to process this. |
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204 | */ |
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205 | |
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206 | if (ret >= 0) { |
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207 | int err = (*iop->pathinfo.handlers->fcntl_h)( iop, cmd ); |
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208 | if (err) { |
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209 | errno = err; |
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210 | ret = -1; |
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211 | } |
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212 | } |
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213 | return ret; |
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214 | } |
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215 | |
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216 | int fcntl( |
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217 | int fd, |
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218 | int cmd, |
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219 | ... |
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220 | ) |
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221 | { |
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222 | int ret; |
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223 | va_list ap; |
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224 | va_start( ap, cmd ); |
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225 | ret = vfcntl(fd,cmd,ap); |
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226 | va_end(ap); |
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227 | return ret; |
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228 | } |
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229 | |
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230 | |
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231 | /* |
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232 | * _fcntl_r |
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233 | * |
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234 | * This is the Newlib dependent reentrant version of fcntl(). |
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235 | */ |
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236 | |
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237 | #if defined(RTEMS_NEWLIB) && !defined(HAVE_FCNTL_R) |
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238 | |
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239 | #include <reent.h> |
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240 | |
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241 | int _fcntl_r( |
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242 | struct _reent *ptr __attribute__((unused)), |
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243 | int fd, |
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244 | int cmd, |
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245 | int arg |
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246 | ) |
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247 | { |
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248 | return fcntl( fd, cmd, arg ); |
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249 | } |
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250 | #endif |
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