Mercurial > hg > nginx
annotate src/os/unix/ngx_posix_init.c @ 5356:acd51b0f6fd4
Disable symlinks: use O_PATH to open path components.
It was introduced in Linux 2.6.39, glibc 2.14 and allows to obtain
file descriptors without actually opening files. Thus made it possible
to traverse path with openat() syscalls without the need to have read
permissions for path components. It is effectively emulates O_SEARCH
which is missing on Linux.
O_PATH is used in combination with O_RDONLY. The last one is ignored
if O_PATH is used, but it allows nginx to not fail when it was built on
modern system (i.e. glibc 2.14+) and run with a kernel older than 2.6.39.
Then O_PATH is unknown to the kernel and ignored, while O_RDONLY is used.
Sadly, fstat() is not working with O_PATH descriptors till Linux 3.6.
As a workaround we fallback to fstatat() with the AT_EMPTY_PATH flag
that was introduced at the same time as O_PATH.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Mon, 02 Sep 2013 08:07:59 +0400 |
parents | 4c36e15651f7 |
children | 1209b8a7b077 |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
539 | 10 #include <nginx.h> |
93
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11 |
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12 |
473 | 13 ngx_int_t ngx_ncpu; |
14 ngx_int_t ngx_max_sockets; | |
15 ngx_uint_t ngx_inherited_nonblocking; | |
16 ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush; | |
449
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17 |
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18 |
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19 struct rlimit rlmt; |
93
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20 |
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21 |
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22 ngx_os_io_t ngx_os_io = { |
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23 ngx_unix_recv, |
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24 ngx_readv_chain, |
1689 | 25 ngx_udp_unix_recv, |
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26 ngx_unix_send, |
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27 ngx_writev_chain, |
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28 0 |
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29 }; |
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30 |
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31 |
539 | 32 ngx_int_t |
33 ngx_os_init(ngx_log_t *log) | |
455 | 34 { |
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35 ngx_uint_t n; |
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36 |
539 | 37 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
38 if (ngx_os_specific_init(log) != NGX_OK) { | |
39 return NGX_ERROR; | |
40 } | |
41 #endif | |
93
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42 |
509 | 43 ngx_init_setproctitle(log); |
44 | |
346
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45 ngx_pagesize = getpagesize(); |
589 | 46 ngx_cacheline_size = NGX_CPU_CACHE_LINE; |
346
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47 |
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48 for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ } |
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49 |
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50 #if (NGX_HAVE_SC_NPROCESSORS_ONLN) |
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51 if (ngx_ncpu == 0) { |
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52 ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN); |
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53 } |
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54 #endif |
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55 |
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56 if (ngx_ncpu < 1) { |
373
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57 ngx_ncpu = 1; |
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58 } |
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59 |
611 | 60 ngx_cpuinfo(); |
61 | |
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62 if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) { |
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63 ngx_log_error(NGX_LOG_ALERT, log, errno, |
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64 "getrlimit(RLIMIT_NOFILE) failed)"); |
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65 return NGX_ERROR; |
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66 } |
577 | 67 |
563 | 68 ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur; |
93
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69 |
3786 | 70 #if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4) |
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71 ngx_inherited_nonblocking = 1; |
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72 #else |
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73 ngx_inherited_nonblocking = 0; |
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74 #endif |
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75 |
800 | 76 srandom(ngx_time()); |
77 | |
93
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78 return NGX_OK; |
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79 } |
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80 |
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81 |
539 | 82 void |
83 ngx_os_status(ngx_log_t *log) | |
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84 { |
541 | 85 ngx_log_error(NGX_LOG_NOTICE, log, 0, NGINX_VER); |
86 | |
557 | 87 #ifdef NGX_COMPILER |
88 ngx_log_error(NGX_LOG_NOTICE, log, 0, "built by " NGX_COMPILER); | |
89 #endif | |
90 | |
539 | 91 #if (NGX_HAVE_OS_SPECIFIC_INIT) |
92 ngx_os_specific_status(log); | |
93 #endif | |
94 | |
531 | 95 ngx_log_error(NGX_LOG_NOTICE, log, 0, |
461 | 96 "getrlimit(RLIMIT_NOFILE): %r:%r", |
449
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97 rlmt.rlim_cur, rlmt.rlim_max); |
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98 } |
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99 |
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100 |
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101 #if 0 |
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102 |
539 | 103 ngx_int_t |
104 ngx_posix_post_conf_init(ngx_log_t *log) | |
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105 { |
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106 ngx_fd_t pp[2]; |
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107 |
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108 if (pipe(pp) == -1) { |
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109 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed"); |
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110 return NGX_ERROR; |
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111 } |
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112 |
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113 if (dup2(pp[1], STDERR_FILENO) == -1) { |
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114 ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed"); |
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115 return NGX_ERROR; |
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116 } |
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117 |
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118 if (pp[1] > STDERR_FILENO) { |
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119 if (close(pp[1]) == -1) { |
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120 ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed"); |
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121 return NGX_ERROR; |
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122 } |
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123 } |
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124 |
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125 return NGX_OK; |
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126 } |
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127 |
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128 #endif |