1 | /* tty_clk_STREAMS.c,v 3.1 1993/07/06 01:07:34 jbj Exp |
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2 | * Timestamp STREAMS module for SunOS 4.1 |
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3 | * |
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4 | * Copyright 1991, Nick Sayer |
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5 | * |
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6 | * Special thanks to Greg Onufer for his debug assists. |
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7 | * |
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8 | * Should be PUSHed directly on top of a serial I/O channel. |
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9 | * For any character in a user-designated set, adds a kernel |
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10 | * timestamp to that character. |
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11 | * |
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12 | * BUGS: |
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13 | * |
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14 | * Only so many characters can be timestamped. This number, however, |
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15 | * is adjustable. |
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16 | * |
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17 | * The null character ($00) cannot be timestamped. |
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18 | * |
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19 | * The M_DATA messages passed upstream will not be the same |
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20 | * size as when they arrive from downstream, even if no |
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21 | * timestamp character is in the message. This, however, |
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22 | * should not affect anything. |
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23 | * |
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24 | */ |
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25 | |
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26 | #include "clk.h" |
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27 | #if NCLK > 0 |
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28 | /* |
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29 | * How big should the messages we pass upstream be? |
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30 | */ |
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31 | #define MESSAGE_SIZE 128 |
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32 | |
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33 | #include <string.h> |
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34 | #include <sys/types.h> |
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35 | #include <sys/stream.h> |
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36 | #include <sys/param.h> |
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37 | #include <sys/time.h> |
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38 | #include <sys/kernel.h> |
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39 | #include <sys/user.h> |
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40 | #include <sys/errno.h> |
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41 | #include <sys/syslog.h> |
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42 | |
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43 | #include <sys/clkdefs.h> |
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44 | |
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45 | static struct module_info rminfo = { 0, "clk", 0, INFPSZ, 0, 0 }; |
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46 | static struct module_info wminfo = { 0, "clk", 0, INFPSZ, 0, 0 }; |
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47 | static int clkopen(), clkrput(), clkwput(), clkclose(); |
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48 | |
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49 | static struct qinit rinit = { clkrput, NULL, clkopen, clkclose, NULL, |
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50 | &rminfo, NULL }; |
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51 | |
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52 | static struct qinit winit = { clkwput, NULL, NULL, NULL, NULL, |
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53 | &wminfo, NULL }; |
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54 | |
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55 | struct streamtab clkinfo = { &rinit, &winit, NULL, NULL }; |
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56 | |
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57 | struct priv_data_type |
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58 | { |
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59 | char in_use; |
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60 | char string[CLK_MAXSTRSIZE]; |
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61 | } priv_data[NCLK]; |
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62 | |
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63 | char first_open=1; |
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64 | |
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65 | /* |
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66 | * God only knows why, but linking with strchr() fails |
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67 | * on my system, so here's a renamed copy. |
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68 | */ |
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69 | |
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70 | u_char *str_chr(s,c) |
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71 | u_char *s; |
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72 | int c; |
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73 | { |
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74 | while (*s) |
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75 | if(*s++ == c) |
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76 | return (s-1); |
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77 | return NULL; |
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78 | } |
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79 | |
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80 | /*ARGSUSED*/ |
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81 | static int clkopen(q, dev, flag, sflag) |
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82 | queue_t *q; |
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83 | dev_t dev; |
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84 | int flag; |
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85 | int sflag; |
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86 | { |
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87 | int i; |
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88 | |
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89 | /* Damn it! We can't even have the global data struct properly |
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90 | initialized! So we have a mark to tell us to init the global |
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91 | data on the first open */ |
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92 | |
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93 | if (first_open) |
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94 | { |
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95 | first_open=0; |
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96 | |
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97 | for(i=0;i<NCLK;i++) |
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98 | priv_data[i].in_use=0; |
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99 | } |
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100 | |
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101 | for(i=0;i<NCLK;i++) |
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102 | if(!priv_data[i].in_use) |
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103 | { |
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104 | priv_data[i].in_use++; |
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105 | ((struct priv_data_type *) (q->q_ptr))=priv_data+i; |
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106 | priv_data[i].string[0]=0; |
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107 | return (0); |
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108 | } |
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109 | u.u_error = EBUSY; |
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110 | return (OPENFAIL); |
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111 | } |
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112 | |
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113 | /*ARGSUSED*/ |
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114 | static int clkclose(q, flag) |
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115 | queue_t *q; |
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116 | int flag; |
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117 | { |
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118 | ((struct priv_data_type *) (q->q_ptr))->in_use=0; |
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119 | |
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120 | return (0); |
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121 | } |
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122 | |
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123 | /* |
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124 | * Now the crux of the biscuit. |
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125 | * |
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126 | * If it's an M_DATA package, we take each character and pass |
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127 | * it to clkchar. |
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128 | */ |
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129 | |
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130 | void clkchar(); |
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131 | |
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132 | static int clkrput(q, mp) |
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133 | queue_t *q; |
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134 | mblk_t *mp; |
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135 | { |
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136 | mblk_t *bp; |
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137 | |
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138 | switch(mp->b_datap->db_type) |
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139 | { |
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140 | case M_DATA: |
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141 | clkchar(0,q,2); |
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142 | for(bp=mp; bp!=NULL; bp=bp->b_cont) |
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143 | { |
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144 | while(bp->b_rptr < bp->b_wptr) |
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145 | clkchar( ((u_char)*(bp->b_rptr++)) , q , 0 ); |
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146 | } |
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147 | clkchar(0,q,1); |
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148 | freemsg(mp); |
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149 | break; |
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150 | default: |
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151 | putnext(q,mp); |
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152 | break; |
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153 | } |
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154 | |
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155 | } |
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156 | |
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157 | /* |
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158 | * If it's a matching M_IOCTL, handle it. |
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159 | */ |
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160 | |
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161 | static int clkwput(q, mp) |
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162 | queue_t *q; |
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163 | mblk_t *mp; |
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164 | { |
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165 | struct iocblk *iocp; |
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166 | |
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167 | switch(mp->b_datap->db_type) |
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168 | { |
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169 | case M_IOCTL: |
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170 | iocp=(struct iocblk*) mp->b_rptr; |
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171 | if (iocp->ioc_cmd==CLK_SETSTR) |
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172 | { |
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173 | strncpy( ((struct priv_data_type *) (RD(q)->q_ptr))->string, |
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174 | (char *) mp->b_cont->b_rptr,CLK_MAXSTRSIZE); |
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175 | /* make sure it's null terminated */ |
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176 | ((struct priv_data_type *) (RD(q)->q_ptr))->string[CLK_MAXSTRSIZE-1]=0; |
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177 | mp->b_datap->db_type = M_IOCACK; |
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178 | qreply(q,mp); |
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179 | } |
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180 | else |
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181 | putnext(q,mp); |
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182 | break; |
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183 | default: |
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184 | putnext(q,mp); |
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185 | break; |
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186 | } |
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187 | } |
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188 | |
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189 | /* |
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190 | * Now clkchar. It takes a character, a queue pointer and an action |
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191 | * flag and depending on the flag either: |
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192 | * |
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193 | * 0 - adds the character to the current message. If there's a |
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194 | * timestamp to be done, do that too. If the message is less than |
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195 | * 8 chars from being full, link in a new one, and set it up for |
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196 | * the next call. |
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197 | * |
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198 | * 1 - sends the whole mess to Valhala. |
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199 | * |
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200 | * 2 - set things up. |
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201 | * |
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202 | * Yeah, it's an ugly hack. Complaints may be filed with /dev/null. |
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203 | */ |
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204 | |
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205 | |
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206 | void clkchar(c,q,f) |
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207 | register u_char c; |
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208 | queue_t *q; |
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209 | char f; |
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210 | { |
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211 | static char error; |
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212 | static mblk_t *message,*mp; |
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213 | struct timeval tv; |
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214 | |
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215 | /* Get a timestamp ASAP! */ |
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216 | uniqtime(&tv); |
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217 | |
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218 | switch(f) |
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219 | { |
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220 | case 1: |
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221 | if (!error) |
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222 | putnext(q,message); |
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223 | break; |
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224 | case 2: |
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225 | mp=message= (mblk_t*) allocb(MESSAGE_SIZE,BPRI_LO); |
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226 | error=(message==NULL); |
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227 | if (error) |
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228 | log(LOG_ERR,"clk: cannot allocate message - data lost"); |
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229 | break; |
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230 | case 0: |
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231 | if (error) /* If we had an error, forget it. */ |
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232 | return; |
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233 | |
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234 | *mp->b_wptr++=c; /* Put the char away first. |
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235 | |
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236 | /* If it's in the special string, append a struct timeval */ |
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237 | |
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238 | if (str_chr( ((struct priv_data_type *) (q->q_ptr))->string , |
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239 | c )!=NULL) |
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240 | { |
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241 | int i; |
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242 | |
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243 | for (i=0;i<sizeof(struct timeval);i++) |
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244 | *mp->b_wptr++= *( ((char*)&tv) + i ); |
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245 | } |
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246 | |
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247 | /* If we don't have space for a complete struct timeval, and a |
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248 | char, it's time for a new mp block */ |
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249 | |
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250 | if (((mp->b_wptr-mp->b_rptr)+sizeof(struct timeval)+2)>MESSAGE_SIZE) |
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251 | { |
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252 | mp->b_cont= (mblk_t*) allocb(MESSAGE_SIZE,BPRI_LO); |
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253 | error=(mp->b_cont==NULL); |
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254 | if (error) |
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255 | { |
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256 | log(LOG_ERR,"clk: cannot allocate message - data lost"); |
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257 | freemsg(message); |
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258 | } |
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259 | mp=mp->b_cont; |
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260 | } |
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261 | |
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262 | break; |
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263 | } |
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264 | } |
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265 | |
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266 | #endif |
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