Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/sendfile-util.c @ 9451:9fff30644260 HEAD

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istream-concat: Fixed a lot of bugs.
author Timo Sirainen <tss@iki.fi>
date Mon, 26 Oct 2009 17:06:57 -0400
parents 46c9e3364d81
children 00cd9aacd03c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */
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2
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3 /* kludge a bit to remove _FILE_OFFSET_BITS definition from config.h.
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4 It's required to be able to include sys/sendfile.h with Linux. */
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5 #include "config.h"
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6 #undef HAVE_CONFIG_H
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7
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8 #ifdef HAVE_LINUX_SENDFILE
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9 # undef _FILE_OFFSET_BITS
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10 #endif
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11
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12 #include "lib.h"
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13 #include "sendfile-util.h"
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14
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15 #ifdef HAVE_LINUX_SENDFILE
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16
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17 #include <sys/sendfile.h>
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18
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19 ssize_t safe_sendfile(int out_fd, int in_fd, uoff_t *offset, size_t count)
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20 {
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21 /* REMEBER: uoff_t and off_t may not be of same size. */
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22 off_t safe_offset;
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23 ssize_t ret;
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24
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25 if (count == 0)
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26 return 0;
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27
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28 /* make sure given offset fits into off_t */
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29 if (sizeof(off_t) * CHAR_BIT == 32) {
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30 /* 32bit off_t */
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31 if (*offset >= 2147483647L) {
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32 errno = EINVAL;
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33 return -1;
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34 }
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35 if (count > 2147483647L - *offset)
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36 count = 2147483647L - *offset;
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37 } else {
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38 /* they're most likely the same size. if not, fix this
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39 code later */
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40 i_assert(sizeof(off_t) == sizeof(uoff_t));
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41
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42 if (*offset >= OFF_T_MAX) {
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43 errno = EINVAL;
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44 return -1;
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45 }
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46 if (count > OFF_T_MAX - *offset)
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47 count = OFF_T_MAX - *offset;
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48 }
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49
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50 safe_offset = (off_t)*offset;
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51 ret = sendfile(out_fd, in_fd, &safe_offset, count);
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52 /* ret=0 : trying to read past EOF, errno = EPIPE : remote is gone */
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53 *offset = (uoff_t)safe_offset;
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54 return ret;
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55 }
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56
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57 #elif defined(HAVE_FREEBSD_SENDFILE)
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58
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59 #include <sys/socket.h>
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60 #include <sys/uio.h>
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61
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62 ssize_t safe_sendfile(int out_fd, int in_fd, uoff_t *offset, size_t count)
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63 {
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64 struct sf_hdtr hdtr;
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65 off_t sbytes;
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66 int ret;
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67
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68 i_assert(count <= SSIZE_T_MAX);
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69
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70 if (count == 0) {
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71 /* if count=0 is passed to sendfile(), it sends everything
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72 from in_fd until EOF. We don't want that. */
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73 return 0;
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74 }
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75
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76 memset(&hdtr, 0, sizeof(hdtr));
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77 ret = sendfile(in_fd, out_fd, *offset, count, &hdtr, &sbytes, 0);
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78
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79 *offset += sbytes;
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80
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81 if (ret == 0 || (ret < 0 && errno == EAGAIN && sbytes > 0))
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82 return (ssize_t)sbytes;
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83 else {
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84 if (errno == ENOTSOCK) {
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85 /* out_fd wasn't a socket. behave as if sendfile()
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86 wasn't supported at all. */
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87 errno = EINVAL;
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88 }
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89 return -1;
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90 }
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91 }
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92
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93 #elif defined (HAVE_SOLARIS_SENDFILE)
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94
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95 #include <sys/sendfile.h>
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96 #include "network.h"
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97
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98 ssize_t safe_sendfile(int out_fd, int in_fd, uoff_t *offset, size_t count)
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99 {
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100 ssize_t ret;
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101 off_t s_offset;
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102
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103 i_assert(count <= SSIZE_T_MAX);
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104
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105 if (count == 0)
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106 return 0;
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107
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108 /* NOTE: if outfd is not a socket, some Solaris versions will
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109 kernel panic */
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110
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111 s_offset = (off_t)*offset;
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112 ret = sendfile(out_fd, in_fd, &s_offset, count);
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113
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114 if (ret < 0) {
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115 /* if remote is gone, EPIPE is returned */
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116 if (errno == EINVAL) {
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117 /* most likely trying to read past EOF */
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118 ret = 0;
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119 } else if (errno == EAFNOSUPPORT) {
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120 /* not supported, return Linux-like EINVAL so caller
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121 sees only consistent errnos. */
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122 errno = EINVAL;
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123 } else if (s_offset != (off_t)*offset) {
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124 /* some data was sent, return it */
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125 i_assert(s_offset > (off_t)*offset);
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126 ret = s_offset - (off_t)*offset;
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127 }
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128 }
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129 *offset = (uoff_t)s_offset;
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130 return ret;
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131 }
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132
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133 #else
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6a64e64fa3a3 Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
Timo Sirainen <tss@iki.fi>
parents: 6240
diff changeset
134 ssize_t safe_sendfile(int out_fd ATTR_UNUSED, int in_fd ATTR_UNUSED,
6a64e64fa3a3 Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
Timo Sirainen <tss@iki.fi>
parents: 6240
diff changeset
135 uoff_t *offset ATTR_UNUSED,
6a64e64fa3a3 Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
Timo Sirainen <tss@iki.fi>
parents: 6240
diff changeset
136 size_t count ATTR_UNUSED)
58
8aaa39e7aec8 sendfile() works now properly with 64bit off_t
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
137 {
8aaa39e7aec8 sendfile() works now properly with 64bit off_t
Timo Sirainen <tss@iki.fi>
parents:
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138 errno = EINVAL;
8aaa39e7aec8 sendfile() works now properly with 64bit off_t
Timo Sirainen <tss@iki.fi>
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139 return -1;
8aaa39e7aec8 sendfile() works now properly with 64bit off_t
Timo Sirainen <tss@iki.fi>
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140 }
976
b3e0f857981c Support for Solaris sendfilev(). Entirely untested, hope it works.
Timo Sirainen <tss@iki.fi>
parents: 528
diff changeset
141
58
8aaa39e7aec8 sendfile() works now properly with 64bit off_t
Timo Sirainen <tss@iki.fi>
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142 #endif