src/server/util/io.c

Wed, 22 May 2013 13:27:31 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 22 May 2013 13:27:31 +0200
changeset 64
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parent 54
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child 65
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permissions
-rw-r--r--

added net_writev

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #ifdef __gnu_linux__
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30 #define _GNU_SOURCE
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31 #endif
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32
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33 #include <unistd.h>
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34 #include <stdlib.h>
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35 #include <sys/uio.h>
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36 #include <sys/sendfile.h>
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37 #include <limits.h> /* asprintf */
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38
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39 #include "../daemon/vfs.h"
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40 #include "io.h"
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41 #include "pool.h"
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42
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43 IOStream native_io_funcs = {
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44 system_write,
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45 system_writev,
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46 system_read,
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47 NULL
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48 };
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49
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50 IOStream net_io_funcs = {
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51 net_stream_write,
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52 net_stream_writev,
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53 net_stream_read,
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54 net_stream_sendfile
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55 };
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56
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57
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58 IOStream* stream_new_from_fd(pool_handle_t *pool, int fd) {
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59 SystemIOStream *st = pool_malloc(pool, sizeof(SystemIOStream));
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60 st->st = native_io_funcs;
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61 st->fd = fd;
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62 return (IOStream*)st;
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63 }
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65 ssize_t system_write(IOStream *st, void *buf, size_t nbytes) {
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66 return write(((SystemIOStream*)st)->fd, buf, nbytes);
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67 }
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68
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69 ssize_t system_writev(IOStream *st, struct iovec *iovec, int iovcnt) {
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70 return writev(((SystemIOStream*)st)->fd, iovec, iovcnt);
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71 }
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72
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73 ssize_t system_read(IOStream *st, void *buf, size_t nbytes) {
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74 return read(((SystemIOStream*)st)->fd, buf, nbytes);
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75 }
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77
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78 IOStream* net_stream_from_fd(pool_handle_t *pool, int fd) {
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79 NetIOStream *st = pool_malloc(pool, sizeof(NetIOStream));
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80 st->st = net_io_funcs;
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81 st->fd = fd;
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82 st->max_read = 0;
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83 st->rd = 0;
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84 return (IOStream*)st;
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85 }
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86
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87 ssize_t net_stream_write(IOStream *st, void *buf, size_t nbytes) {
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88 return write(((NetIOStream*)st)->fd, buf, nbytes);
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89 }
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90
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91 ssize_t net_stream_writev(IOStream *st, struct iovec *iovec, int iovcnt) {
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92 return writev(((NetIOStream*)st)->fd, iovec, iovcnt);
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93 }
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94
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95 ssize_t net_stream_read(IOStream *st, void *buf, size_t nbytes) {
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96 NetIOStream *n = (NetIOStream*)st;
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97 if(n->max_read != 0 && n->rd >= n->max_read) {
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98 return 0;
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99 }
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100 ssize_t r = read(n->fd, buf, nbytes);
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101 n->rd += r;
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102 return r;
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103 }
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104
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105 ssize_t net_stream_sendfile(IOStream *st, sendfiledata *sfd) {
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106 NetIOStream *io = (NetIOStream*)st;
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107 // TODO: header and trailer
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108 ssize_t ret = 0;
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109 off_t fileoffset = sfd->offset;
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110 if(sfd->fd->fd != -1) {
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111 ret = sendfile(io->fd, sfd->fd->fd, &fileoffset, sfd->len);
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112 } else {
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113 // TODO: regular copy
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114 fprintf(stderr, "sendfile not implemented for SYS_FILE\n");
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115 }
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116
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117 return ret;
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118 }
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119
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120
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121 ssize_t net_read(SYS_NETFD fd, void *buf, size_t nbytes) {
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122 ssize_t r = ((IOStream*)fd)->read(fd, buf, nbytes);
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123 if(r == 0) {
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124 return IO_EOF;
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125 }
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126 return r;
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127 }
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128
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129 ssize_t net_write(SYS_NETFD fd, void *buf, size_t nbytes) {
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130 ssize_t r = ((IOStream*)fd)->write(fd, buf, nbytes);
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131 if(r < 0) {
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132 return IO_ERROR;
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133 }
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134 return r;
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135 }
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136
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137 ssize_t net_writev(SYS_NETFD fd, struct iovec *iovec, int iovcnt) {
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138 ssize_t r = ((IOStream*)fd)->writev(fd, iovec, iovcnt);
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139 if(r < 0) {
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140 return IO_ERROR;
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141 }
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142 return r;
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143 }
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144
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145 ssize_t net_printf(SYS_NETFD fd, char *format, ...) {
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146 va_list arg;
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147 va_start(arg, format);
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148 char *buf;
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149 ssize_t len = vasprintf(&buf, format, arg);
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150 ssize_t r = net_write(fd, buf, len);
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151 free(buf);
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152 return r;
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153 }
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154
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155 ssize_t net_sendfile(SYS_NETFD fd, sendfiledata *sfd) {
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156 IOStream *out = fd;
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157 if(out->sendfile) {
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158 ssize_t r = ((IOStream*)fd)->sendfile(fd, sfd);
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159 if(r < 0) {
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160 return IO_ERROR;
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161 }
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162 } else {
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163 fprintf(stderr, "stream does not support sendfile\n");
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164 }
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165 return IO_ERROR;
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166 }
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167
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168
4
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169 /* iovec buffer */
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170 iovec_buf_t *iovec_buf_create(pool_handle_t *pool) {
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171 iovec_buf_t *buf = pool_malloc(pool, sizeof(iovec_buf_t));
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172
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173 buf->pool = pool;
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174 buf->iov = pool_calloc(pool, 32, sizeof(struct iovec));
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175 buf->maxiovec = 32;
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176 buf->iovctn = 0;
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177
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178 return buf;
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179 }
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180
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181 void iovec_buf_write(iovec_buf_t *io, void *buf, size_t nbyte) {
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182 if(io->iovctn >= io->maxiovec) {
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183 io->iov = pool_realloc(
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184 io->pool,
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185 io->iov,
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186 (io->maxiovec + 16) * sizeof(struct iovec));
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187 }
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188
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189 io->iov[io->iovctn].iov_base = buf;
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190 io->iov[io->iovctn].iov_len = nbyte;
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191 io->iovctn++;
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192 }
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193
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194 ssize_t iovec_buf_flush(iovec_buf_t *io, int fd) {
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195 return writev(fd, io->iov, io->iovctn);
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196 }
32
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197
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198
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199 /* TODO: add asprintf to new file */
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200
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201 /*
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202 * asprintf implementation for Solaris 10
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203 * source from OpenSolaris
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204 * file: /onnv/onnv-gate/usr/src/lib/libc/port/print/asprintf.c
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205 */
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206
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207 /*
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208 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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209 * Use is subject to license terms.
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210 */
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211
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212 /*
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213 * Copyright (c) 2004 Darren Tucker.
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214 *
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215 * Based originally on asprintf.c from OpenBSD:
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216 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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217 *
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218 * Permission to use, copy, modify, and distribute this software for any
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219 * purpose with or without fee is hereby granted, provided that the above
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220 * copyright notice and this permission notice appear in all copies.
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221 *
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222 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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223 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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224 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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225 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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226 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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227 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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228 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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229 */
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230
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231 #ifdef __SunOS_5_10
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232
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233 #define INIT_SZ 128
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234
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235 /* VARARGS2 */
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236 int
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237 vasprintf(char **str, const char *format, va_list ap)
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238 {
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239 char string[INIT_SZ];
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240 char *newstr;
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241 int ret;
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242 size_t len;
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243
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244 *str = NULL;
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245 ret = vsnprintf(string, INIT_SZ, format, ap);
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246 if (ret < 0) /* retain the value of errno from vsnprintf() */
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247 return (-1);
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248 if (ret < INIT_SZ) {
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249 len = ret + 1;
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250 if ((newstr = malloc(len)) == NULL)
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251 return (-1); /* retain errno from malloc() */
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252 (void) strlcpy(newstr, string, len);
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253 *str = newstr;
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254 return (ret);
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255 }
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256 /*
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257 * We will perform this loop more than once only if some other
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258 * thread modifies one of the vasprintf() arguments after our
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259 * previous call to vsnprintf().
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260 */
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261 for (;;) {
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262 if (ret == INT_MAX) { /* Bad length */
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263 errno = ENOMEM;
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264 return (-1);
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265 }
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266 len = ret + 1;
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267 if ((newstr = malloc(len)) == NULL)
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268 return (-1); /* retain errno from malloc() */
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269 ret = vsnprintf(newstr, len, format, ap);
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270 if (ret < 0) { /* retain errno from vsnprintf() */
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271 free(newstr);
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272 return (-1);
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273 }
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274 if (ret < len) {
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275 *str = newstr;
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276 return (ret);
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277 }
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278 free(newstr);
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279 }
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280 }
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281
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282 int
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283 asprintf(char **str, const char *format, ...)
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284 {
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285 va_list ap;
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286 int ret;
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287
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288 *str = NULL;
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289 va_start(ap, format);
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290 ret = vasprintf(str, format, ap);
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291 va_end(ap);
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292
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293 return (ret);
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294 }
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295
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296 #endif

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